c# 获取 摄像头 实现录像 - 无网不进
1 c# 获取 摄像头 实现录像 2 3 利用普通的简易摄像头,通过C#语言即可开发成简易视频程序。本实例利用市场上购买的普通摄像头,利用VFW技术,实现单路视频监控系统。运行程序,窗体中将显示舰体摄像头采集的视频信息。如图13.9所示。 4 技术要点 5 本实例主要使用了VFW(Video for Windows)技术。VFW 是Microsoft公司为开发Windows平台下的视频应用程序提供的软件工具包,提供了一系列应用程序编程接口(API),用户可以通过这些接口很方便地实现视频捕获、视频编辑及视频播放等通用功能,还可利用回调函数开发比较复杂的视频应用程序。该技术的特点是播放视频时不需要专用的硬件设备,而且应用灵活,可以满足视频应用程序开发的需要。Windows操作系统自身就携带了VFW技术,系统安装时,会自动安装VFW的相关组件。 6 VFW技术主要由六个功能模块组成,下面进行简单说明。 7 AVICAP32.DLL:包含执行视频捕获的函数,给AVI文件的I/O处理和视频,音频设备驱动程序提供一个高级接口。 8 MSVIDEO.DLL:包含一套特殊的DrawDib函数,用来处理程序上的视频操作。 9 MCIAVI.DRV:包括对VFW的MCI命令解释器的驱动程序。 10 AVIFILE.DLL:包含由标准多媒体I/O(mmio)函数提供的更高级的命令,用来访问.AVI文件。 11 ICM:压缩管理器,用于管理的视频压缩/解压缩的编译码器。 12 ACM:音频压缩管理器,提供与ICM相似的服务,适用于波形音频。 13 AVICAP32.DLL中的函数和USER32.DLL中的函数,函数语法及结构如下。 14 (1)capCreateCaptureWindow函数 15 该函数用于创建一个视频捕捉窗口。语法如下: 16 [DllImport("avicap32.dll")] 17 public static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID); 18 参数说明如下。 19 lpszWindowName:标识窗口的名称。 20 dwStyle:标识窗口风格。 21 x、y:标识窗口的左上角坐标。 22 nWidth、nHeight:标识窗口的宽度和高度。 23 hWnd:标识父窗口句柄。 24 nID:标识窗口ID。 25 返回值:视频捕捉窗口句柄。 26 (2)SendMessage函数 27 用于向Windows系统发送消息机制。 28 [DllImport("User32.dll")] 29 private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam); 30 参数说明如下。 31 hWnd:窗口句柄。 32 wMsg:将要发送的消息。 33 wParam、lParam:消息的参数,每个消息都有两个参数,参数设置由发送的消息而定。 34 35 36 37 Form1窗体中通过调用视频类中的方法来实现相应的功能。 38 39 在【开始录像】按钮的Click事件中添加如下代码: 40 41 private void buttonStart_Click(object sender, EventArgs e) 42 { 43 buttonStart.Enabled = false; 44 buttonStop.Enabled = true; 45 //btnPz.Enabled = true; 46 video = new cVideo(picCapture.Handle, picCapture.Width, picCapture.Height); 47 video.StartWebCam(); 48 } 49 50 在【停止录像】按钮的Click事件中添加如下代码: 51 52 private void buttonStop_Click(object sender, EventArgs e) 53 { 54 buttonStart.Enabled = true; 55 buttonStop.Enabled = false; 56 buttonPz.Enabled = false; 57 video.CloseWebcam(); 58 } 59 60 61 在【拍照】按钮的Click事件下添加如下代码: 62 63 private void buttonPz_Click(object sender, EventArgs e) 64 { 65 video.GrabImage(picCapture.Handle, "d:\\a.bmp"); 66 } 67 68 69 70 完整代码如下: 71 72 1、Program.cs 73 74 75 76 using System; 77 using System.Collections.Generic; 78 using System.Linq; 79 using System.Windows.Forms; 80 81 namespace Video1 82 { 83 static class Program 84 { 85 /// <summary> 86 /// 应用程序的主入口点。 87 /// </summary> 88 [STAThread] 89 static void Main() 90 { 91 Application.EnableVisualStyles(); 92 Application.SetCompatibleTextRenderingDefault(false); 93 Application.Run(new Form1()); 94 } 95 } 96 } 97 98 99 100 2、Form1.cs 101 102 103 104 using System; 105 using System.Collections.Generic; 106 using System.ComponentModel; 107 using System.Data; 108 using System.Drawing; 109 using System.Linq; 110 using System.Text; 111 using System.Windows.Forms; 112 113 namespace Video1 114 { 115 public partial class Form1 : Form 116 { 117 cVideo video; 118 public Form1() 119 { 120 InitializeComponent(); 121 } 122 123 private void buttonStart_Click(object sender, EventArgs e) 124 { 125 buttonStart.Enabled = false; 126 buttonStop.Enabled = true; 127 //btnPz.Enabled = true; 128 video = new cVideo(picCapture.Handle, picCapture.Width, picCapture.Height); 129 video.StartWebCam(); 130 } 131 132 private void buttonStop_Click(object sender, EventArgs e) 133 { 134 buttonStart.Enabled = true; 135 buttonStop.Enabled = false; 136 buttonPz.Enabled = false; 137 video.CloseWebcam(); 138 } 139 140 private void buttonPz_Click(object sender, EventArgs e) 141 { 142 video.GrabImage(picCapture.Handle, "d:\\a.bmp"); 143 } 144 } 145 } 146 147 148 3、Form1.Designer.cs 149 150 151 152 namespace Video1 153 { 154 partial class Form1 155 { 156 /// <summary> 157 /// 必需的设计器变量。 158 /// </summary> 159 private System.ComponentModel.IContainer components = null; 160 161 /// <summary> 162 /// 清理所有正在使用的资源。 163 /// </summary> 164 /// <param>如果应释放托管资源,为 true;否则为 false。</param> 165 protected override void Dispose(bool disposing) 166 { 167 if (disposing && (components != null)) 168 { 169 components.Dispose(); 170 } 171 base.Dispose(disposing); 172 } 173 174 #region Windows 窗体设计器生成的代码 175 176 /// <summary> 177 /// 设计器支持所需的方法 - 不要 178 /// 使用代码编辑器修改此方法的内容。 179 /// </summary> 180 private void InitializeComponent() 181 { 182 System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1)); 183 this.buttonStart = new System.Windows.Forms.Button(); 184 this.buttonStop = new System.Windows.Forms.Button(); 185 this.buttonPz = new System.Windows.Forms.Button(); 186 this.panelTop = new System.Windows.Forms.Panel(); 187 this.picCapture = new System.Windows.Forms.PictureBox(); 188 this.panelBottom = new System.Windows.Forms.Panel(); 189 this.panelTop.SuspendLayout(); 190 ((System.ComponentModel.ISupportInitialize)(this.picCapture)).BeginInit(); 191 this.panelBottom.SuspendLayout(); 192 this.SuspendLayout(); 193 // 194 // buttonStart 195 // 196 this.buttonStart.Location = new System.Drawing.Point(39, 3); 197 this.buttonStart.Name = "buttonStart"; 198 this.buttonStart.Size = new System.Drawing.Size(88, 36); 199 this.buttonStart.TabIndex = 1; 200 this.buttonStart.Text = "开始录像"; 201 this.buttonStart.UseVisualStyleBackColor = true; 202 this.buttonStart.Click += new System.EventHandler(this.buttonStart_Click); 203 // 204 // buttonStop 205 // 206 this.buttonStop.Location = new System.Drawing.Point(181, 3); 207 this.buttonStop.Name = "buttonStop"; 208 this.buttonStop.Size = new System.Drawing.Size(80, 36); 209 this.buttonStop.TabIndex = 2; 210 this.buttonStop.Text = "停止录像"; 211 this.buttonStop.UseVisualStyleBackColor = true; 212 this.buttonStop.Click += new System.EventHandler(this.buttonStop_Click); 213 // 214 // buttonPz 215 // 216 this.buttonPz.Location = new System.Drawing.Point(313, 3); 217 this.buttonPz.Name = "buttonPz"; 218 this.buttonPz.Size = new System.Drawing.Size(77, 36); 219 this.buttonPz.TabIndex = 3; 220 this.buttonPz.Text = "拍 照"; 221 this.buttonPz.UseVisualStyleBackColor = true; 222 this.buttonPz.Click += new System.EventHandler(this.buttonPz_Click); 223 // 224 // panelTop 225 // 226 this.panelTop.AutoSize = true; 227 this.panelTop.Controls.Add(this.picCapture); 228 this.panelTop.Dock = System.Windows.Forms.DockStyle.Fill; 229 this.panelTop.Location = new System.Drawing.Point(0, 0); 230 this.panelTop.Name = "panelTop"; 231 this.panelTop.Size = new System.Drawing.Size(468, 372); 232 this.panelTop.TabIndex = 4; 233 // 234 // picCapture 235 // 236 this.picCapture.Dock = System.Windows.Forms.DockStyle.Fill; 237 this.picCapture.InitialImage = ((System.Drawing.Image)(resources.GetObject("picCapture.InitialImage"))); 238 this.picCapture.Location = new System.Drawing.Point(0, 0); 239 this.picCapture.Name = "picCapture"; 240 this.picCapture.Size = new System.Drawing.Size(468, 372); 241 this.picCapture.TabIndex = 0; 242 this.picCapture.TabStop = false; 243 // 244 // panelBottom 245 // 246 this.panelBottom.Controls.Add(this.buttonStart); 247 this.panelBottom.Controls.Add(this.buttonStop); 248 this.panelBottom.Controls.Add(this.buttonPz); 249 this.panelBottom.Dock = System.Windows.Forms.DockStyle.Bottom; 250 this.panelBottom.Location = new System.Drawing.Point(0, 327); 251 this.panelBottom.Name = "panelBottom"; 252 this.panelBottom.Size = new System.Drawing.Size(468, 45); 253 this.panelBottom.TabIndex = 5; 254 // 255 // Form1 256 // 257 this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); 258 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 259 this.ClientSize = new System.Drawing.Size(468, 372); 260 this.Controls.Add(this.panelBottom); 261 this.Controls.Add(this.panelTop); 262 this.Name = "Form1"; 263 this.Text = "Form1"; 264 this.panelTop.ResumeLayout(false); 265 ((System.ComponentModel.ISupportInitialize)(this.picCapture)).EndInit(); 266 this.panelBottom.ResumeLayout(false); 267 this.ResumeLayout(false); 268 this.PerformLayout(); 269 270 } 271 272 #endregion 273 274 private System.Windows.Forms.PictureBox picCapture; 275 private System.Windows.Forms.Button buttonStart; 276 private System.Windows.Forms.Button buttonStop; 277 private System.Windows.Forms.Button buttonPz; 278 private System.Windows.Forms.Panel panelTop; 279 private System.Windows.Forms.Panel panelBottom; 280 } 281 } 282 283 4、ClassVideoAPI.cs 284 285 using System; 286 using System.Collections.Generic; 287 using System.Linq; 288 using System.Text; 289 using System.Drawing; 290 using System.Runtime.InteropServices; 291 using System.Threading; 292 using System.Windows.Forms; 293 using System.IO; 294 295 namespace Video1 296 { 297 public class VideoAPI //视频API类 298 { 299 // 视频API调用 300 [DllImport("avicap32.dll")]//包含了执行视频捕获的函数,它给AVI文件I/O和视频、音频设备驱动程序提供一个高级接口 301 public static extern IntPtr capCreateCaptureWindow(string lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hwndParent, int nID); 302 [DllImport("AVICAP32.dll", CharSet = CharSet.Unicode)] 303 public static extern bool capGetDriverDescription(int wDriverIndex, StringBuilder lpszName, int cbName, StringBuilder lpszVer, int cbVer); 304 [DllImport("avicap32.dll")] 305 public static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID); 306 [DllImport("avicap32.dll")] 307 public static extern bool capGetDriverDescriptionA(short wDriver, byte[] lpszName, int cbName, byte[] lpszVer, int cbVer); 308 [DllImport("User32.dll")] 309 public static extern bool SendMessage(IntPtr hWnd, int wMsg, bool wParam, int lParam); 310 [DllImport("User32.dll")] 311 public static extern bool SendMessage(IntPtr hWnd, int wMsg, short wParam, int lParam); 312 [DllImport("User32.dll")] 313 public static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam); 314 [DllImport("User32.dll")] 315 public static extern bool SendMessage(IntPtr hWnd, int wMsg, short wParam, FrameEventHandler lParam); 316 [DllImport("User32.dll")] 317 public static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, ref BITMAPINFO lParam); 318 [DllImport("User32.dll")] 319 public static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, ref CAPDRIVERCAPS lParam); 320 [DllImport("User32.dll")] 321 public static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, ref CAPTUREPARMS lParam); 322 [DllImport("User32.dll")] 323 public static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, ref CAPSTATUS lParam); 324 [DllImport("User32.dll")] 325 public static extern int SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags); 326 [DllImport("avicap32.dll")] 327 public static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize); 328 329 // 常量 330 // public const int WM_USER = 0x400; 331 public const int WS_CHILD = 0x40000000; 332 public const int WS_VISIBLE = 0x10000000; 333 334 public const int SWP_NOMOVE = 0x2; 335 public const int SWP_NOZORDER = 0x4; 336 // public const int WM_CAP_DRIVER_CONNECT = WM_USER + 10; 337 // public const int WM_CAP_DRIVER_DISCONNECT = WM_USER + 11; 338 public const int WM_CAP_SET_CALLBACK_FRAME = WM_USER + 5; 339 // public const int WM_CAP_SET_PREVIEW = WM_USER + 50; 340 // public const int WM_CAP_SET_PREVIEWRATE = WM_USER + 52; 341 // public const int WM_CAP_SET_VIDEOFORMAT = WM_USER + 45; 342 // public const int WM_CAP_START = WM_USER; 343 public const int WM_CAP_SAVEDIB = WM_CAP_START + 25; 344 345 public const string avicap32 = "avicap32.dll"; 346 public const int WM_USER = 1024; 347 /// <summary> 348 ///WM_CAP_START=WM_USER=1024 349 /// </summary> 350 public const int WM_CAP_START = WM_USER; 351 352 // start of unicode messages 353 /// <summary> 354 /// 开始 WM_USER + 100=1124 355 /// </summary> 356 public const int WM_CAP_UNICODE_START = WM_USER + 100; //开始 1124 357 /// <summary> 358 /// /获得 CAPSTR EAMPTR 359 /// WM_CAP_START + 1=1025 360 /// </summary> 361 public const int WM_CAP_GET_CAPSTREAMPTR = (WM_CAP_START + 1); //获得 CAPSTR EAMPTR 362 /// <summary> 363 /// 设置收回错误 WM_CAP_START + 2=1026 364 /// </summary> 365 public const int WM_CAP_SET_CALLBACK_ERROR = (WM_CAP_START + 2); //设置收回错误 366 /// <summary> 367 /// 设置收回状态 WM_CAP_START + 3=1027 368 /// </summary> 369 public const int WM_CAP_SET_CALLBACK_STATUS = (WM_CAP_START + 3); //设置收回状态 370 /// <summary> 371 /// 设置收回出产 WM_CAP_START + 4=1028 372 /// </summary> 373 public const int WM_CAP_SET_CALLBACK_YIELD = (WM_CAP_START + 4); //设置收回出产 374 /// <summary> 375 /// 设置收回结构 WM_CAP_START + 5=1029 376 /// </summary> 377 public const int WM_CAP_SET_CALLBACK_FRame = (WM_CAP_START + 5); //设置收回结构 378 /// <summary> 379 /// 设置收回视频流 WM_CAP_START + 6=1030 380 /// </summary> 381 public const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = (WM_CAP_START + 6); //设置收回视频流 382 /// <summary> 383 /// 设置收回视频波流 WM_CAP_START +7=1031 384 /// </summary> 385 public const int WM_CAP_SET_CALLBACK_WAVESTREAM = (WM_CAP_START + 7); //设置收回视频波流 386 /// <summary> 387 /// 获得使用者数据 WM_CAP_START + 8=1032 388 /// </summary> 389 public const int WM_CAP_GET_USER_DATA = (WM_CAP_START + 8); //获得使用者数据 390 /// <summary> 391 /// 设置使用者数据 WM_CAP_START + 9=1033 392 /// </summary> 393 public const int WM_CAP_SET_USER_DATA = (WM_CAP_START + 9); //设置使用者数据 394 /// <summary> 395 /// 驱动程序连接 WM_CAP_START + 10=1034 396 /// </summary> 397 public const int WM_CAP_DRIVER_CONNECT = (WM_CAP_START + 10); //驱动程序连接 398 /// <summary> 399 /// 断开启动程序连接 WM_CAP_START + 11=1035 400 /// </summary> 401 public const int WM_CAP_DRIVER_DISCONNECT = (WM_CAP_START + 11); //断开启动程序连接 402 /// <summary> 403 /// 获得驱动程序名字 WM_CAP_START + 12=1036 404 /// </summary> 405 public const int WM_CAP_DRIVER_GET_NAME = (WM_CAP_START + 12); //获得驱动程序名字 406 /// <summary> 407 /// 获得驱动程序版本 WM_CAP_START + 13=1037 408 /// </summary> 409 public const int WM_CAP_DRIVER_GET_VERSION = (WM_CAP_START + 13); //获得驱动程序版本 410 /// <summary> 411 /// 获得驱动程序帽子 WM_CAP_START + 14=1038 412 /// </summary> 413 public const int WM_CAP_DRIVER_GET_CAPS = (WM_CAP_START + 14); //获得驱动程序帽子 414 /// <summary> 415 /// 设置捕获文件 WM_CAP_START + 20=1044 416 /// </summary> 417 public const int WM_CAP_FILE_SET_CAPTURE_FILE = (WM_CAP_START + 20); //设置捕获文件 418 /// <summary> 419 /// 获得捕获文件 WM_CAP_START + 21=1045 420 /// </summary> 421 public const int WM_CAP_FILE_GET_CAPTURE_FILE = (WM_CAP_START + 21); //获得捕获文件 422 /// <summary> 423 /// 另存文件为 WM_CAP_START + 23=1047 424 /// </summary> 425 public const int WM_CAP_FILE_SAVEAS = (WM_CAP_START + 23); //另存文件为 426 /// <summary> 427 /// 保存文件 WM_CAP_START + 25=1049 428 /// </summary> 429 public const int WM_CAP_FILE_SAVEDIB = (WM_CAP_START + 25); //保存文件 430 431 // out of order to save on ifdefs 432 /// <summary> 433 /// 分派文件 WM_CAP_START + 22=1044 434 /// </summary> 435 public const int WM_CAP_FILE_ALLOCATE = (WM_CAP_START + 22); //分派文件 436 /// <summary> 437 /// 设置开始文件 WM_CAP_START + 24=1046 438 /// </summary> 439 public const int WM_CAP_FILE_SET_INFOCHUNK = (WM_CAP_START + 24); //设置开始文件 440 /// <summary> 441 /// 编辑复制 WM_CAP_START + 30=1054 442 /// </summary> 443 public const int WM_CAP_EDIT_COPY = (WM_CAP_START + 30); //编辑复制 444 /// <summary> 445 /// 设置音频格式 WM_CAP_START + 35=1059 446 /// </summary> 447 public const int WM_CAP_SET_AUDIOFORMAT = (WM_CAP_START + 35); //设置音频格式 448 /// <summary> 449 /// 捕获音频格式 WM_CAP_START + 36=1060 450 /// </summary> 451 public const int WM_CAP_GET_AUDIOFORMAT = (WM_CAP_START + 36); //捕获音频格式 452 /// <summary> 453 /// 打开视频格式设置对话框 WM_CAP_START + 41=1065 454 /// </summary> 455 public const int WM_CAP_DLG_VIDEOFORMAT = (WM_CAP_START + 41); //1065 打开视频格式设置对话框 456 /// <summary> 457 /// 打开属性设置对话框,设置对比度、亮度等 WM_CAP_START + 42=1066 458 /// </summary> 459 public const int WM_CAP_DLG_VIDEOSOURCE = (WM_CAP_START + 42); //1066 打开属性设置对话框,设置对比度、亮度等。 460 /// <summary> 461 /// 打开视频显示 WM_CAP_START + 43=1067 462 /// </summary> 463 public const int WM_CAP_DLG_VIDEODISPLAY = (WM_CAP_START + 43); //1067 打开视频显示 464 /// <summary> 465 /// 获得视频格式 WM_CAP_START + 44=1068 466 /// </summary> 467 public const int WM_CAP_GET_VIDEOFORMAT = (WM_CAP_START + 44); //1068 获得视频格式 468 /// <summary> 469 /// 设置视频格式 WM_CAP_START + 45=1069 470 /// </summary> 471 public const int WM_CAP_SET_VIDEOFORMAT = (WM_CAP_START + 45); //1069 设置视频格式 472 /// <summary> 473 /// 打开压缩设置对话框 WM_CAP_START + 46=1070 474 /// </summary> 475 public const int WM_CAP_DLG_VIDEOCOMPRESSION = (WM_CAP_START + 46); //1070 打开压缩设置对话框 476 /// <summary> 477 /// 设置预览 WM_CAP_START + 50=1074 478 /// </summary> 479 public const int WM_CAP_SET_PREVIEW = (WM_CAP_START + 50); //设置预览 480 /// <summary> 481 /// 设置覆盖 WM_CAP_START + 51=1075 482 /// </summary> 483 public const int WM_CAP_SET_OVERLAY = (WM_CAP_START + 51); //设置覆盖 484 /// <summary> 485 /// 设置预览比例 WM_CAP_START + 52=1076 486 /// </summary> 487 public const int WM_CAP_SET_PREVIEWRATE = (WM_CAP_START + 52); //设置预览比例 488 /// <summary> 489 /// 设置刻度 WM_CAP_START + 53=1077 490 /// </summary> 491 public const int WM_CAP_SET_SCALE = (WM_CAP_START + 53); //设置刻度 492 /// <summary> 493 /// 获得状态 WM_CAP_START + 54=1078 494 /// </summary> 495 public const int WM_CAP_GET_STATUS = (WM_CAP_START + 54); //获得状态 496 /// <summary> 497 /// 设置卷 WM_CAP_START + 55=1079 498 /// </summary> 499 public const int WM_CAP_SET_SCROLL = (WM_CAP_START + 55); //设置卷 500 /// <summary> 501 /// 逮捕结构 WM_CAP_START + 60=1084 502 /// </summary> 503 public const int WM_CAP_GRAB_FRame = (WM_CAP_START + 60); //逮捕结构 504 /// <summary> 505 /// 停止逮捕结构 WM_CAP_START + 61=1085 506 /// </summary> 507 public const int WM_CAP_GRAB_FRame_NOSTOP = (WM_CAP_START + 61); //停止逮捕结构 508 /// <summary> 509 /// 次序 WM_CAP_START + 62=1086 510 /// </summary> 511 public const int WM_CAP_SEQUENCE = (WM_CAP_START + 62); //次序 512 /// <summary> 513 /// 没有文件 WM_CAP_START + 63=1087 514 /// </summary> 515 public const int WM_CAP_SEQUENCE_NOFILE = (WM_CAP_START + 63); //没有文件 516 /// <summary> 517 /// 设置安装次序 WM_CAP_START + 64=1088 518 /// </summary> 519 public const int WM_CAP_SET_SEQUENCE_SETUP = (WM_CAP_START + 64); //设置安装次序 520 /// <summary> 521 /// 获得安装次序 WM_CAP_START + 65=1089 522 /// </summary> 523 public const int WM_CAP_GET_SEQUENCE_SETUP = (WM_CAP_START + 65); //获得安装次序 524 /// <summary> 525 /// 设置媒体控制接口 WM_CAP_START + 66=1090 526 /// </summary> 527 public const int WM_CAP_SET_MCI_DEVICE = (WM_CAP_START + 66); //设置媒体控制接口 528 /// <summary> 529 /// 获得媒体控制接口 WM_CAP_START + 67=1091 530 /// </summary> 531 public const int WM_CAP_GET_MCI_DEVICE = (WM_CAP_START + 67); //获得媒体控制接口 532 /// <summary> 533 /// 停止 WM_CAP_START + 68=1092 534 /// </summary> 535 public const int WM_CAP_STOP = (WM_CAP_START + 68); //停止 536 /// <summary> 537 /// 异常中断 WM_CAP_START + 69=1093 538 /// </summary> 539 public const int WM_CAP_ABORT = (WM_CAP_START + 69); //异常中断 540 /// <summary> 541 /// 打开单一的结构 WM_CAP_START + 68=1094 542 /// </summary> 543 public const int WM_CAP_SINGLE_FRame_OPEN = (WM_CAP_START + 70); //打开单一的结构 544 /// <summary> 545 /// 关闭单一的结构 WM_CAP_START + 71=1095 546 /// </summary> 547 public const int WM_CAP_SINGLE_FRame_CLOSE = (WM_CAP_START + 71); //关闭单一的结构 548 /// <summary> 549 /// 单一的结构 WM_CAP_START + 72=1096 550 /// </summary> 551 public const int WM_CAP_SINGLE_FRame = (WM_CAP_START + 72); //单一的结构 552 /// <summary> 553 /// 打开视频 WM_CAP_START + 80=1104 554 /// </summary> 555 public const int WM_CAP_PAL_OPEN = (WM_CAP_START + 80); //打开视频 556 /// <summary> 557 /// 保存视频 WM_CAP_START + 81=1105 558 /// </summary> 559 public const int WM_CAP_PAL_SAVE = (WM_CAP_START + 81); //保存视频 560 /// <summary> 561 /// 粘贴视频 WM_CAP_START + 82=1106 562 /// </summary> 563 public const int WM_CAP_PAL_PASTE = (WM_CAP_START + 82); //粘贴视频 564 /// <summary> 565 /// 自动创造 WM_CAP_START + 83=1107 566 /// </summary> 567 public const int WM_CAP_PAL_AUTOCREATE = (WM_CAP_START + 83); //自动创造 568 /// <summary> 569 /// 手动创造 WM_CAP_START + 84=1108 570 /// </summary> 571 public const int WM_CAP_PAL_MANUALCREATE = (WM_CAP_START + 84); //手动创造 572 573 // Following added post VFW 1.1 574 /// <summary> 575 /// 设置收回的错误 WM_CAP_START + 85=1109 576 /// </summary> 577 public const int WM_CAP_SET_CALLBACK_CAPCONTROL = (WM_CAP_START + 85); // 设置收回的错误 578 579 public const int WM_CAP_END = WM_CAP_SET_CALLBACK_CAPCONTROL; 580 581 public delegate void FrameEventHandler(IntPtr lwnd, IntPtr lpVHdr); 582 583 #region 公共函数 584 //公共函数 585 public static object GetStructure(IntPtr ptr, ValueType structure) 586 { 587 return Marshal.PtrToStructure(ptr, structure.GetType()); 588 } 589 590 public static object GetStructure(int ptr, ValueType structure) 591 { 592 return GetStructure(new IntPtr(ptr), structure); 593 } 594 595 public static void Copy(IntPtr ptr, byte[] data) 596 { 597 Marshal.Copy(ptr, data, 0, data.Length); 598 } 599 600 public static void Copy(int ptr, byte[] data) 601 { 602 Copy(new IntPtr(ptr), data); 603 } 604 605 public static int SizeOf(object structure) 606 { 607 return Marshal.SizeOf(structure); 608 } 609 #endregion 公共函数 610 #region 结构 VIDEOHDR|BITMAPINFOHEADER|BITMAPINFO|CAPTUREPARMS|CAPDRIVERCAPS|CAPSTATUS 611 //========================================================VideoHdr 结构===================================================================== 612 //VideoHdr 结构 定义了视频数据块的头信息,在编写回调函数时常用到其数据成员lpData(指向数据缓存的指针)和dwBufferLength(数据缓存的大小)。 613 //视频帧到缓存的捕获则需要应用回调函数和相应的数据块结构 VIDEOHDR 614 [StructLayout(LayoutKind.Sequential)] 615 public struct VIDEOHDR 616 { 617 public IntPtr lpData; /* 指向数据缓存的指针 */ 618 public int dwBufferLength; /* 数据缓存的大小 */ 619 public int dwBytesUsed; /* Bytes actually used */ 620 public int dwTimeCaptured; /* Milliseconds from start of stream */ 621 public int dwUser; /* for client\'s use */ 622 public int dwFlags; /* assorted flags (see defines) */ 623 public int dwReserved; /* reserved for driver */ 624 } 625 //=======================================================BitmapInfoHeader结构=================================================================== 626 //BitmapInfoHeader定义了位图的头部信息 627 [StructLayout(LayoutKind.Sequential)] 628 public struct BITMAPINFOHEADER 629 { 630 public int biSize; 631 public int biWidth; 632 public int biHeight; 633 public short biPlanes; 634 public short biBitCount; 635 public int biCompression; 636 public int biSizeImage; 637 public int biXPelsPerMeter; 638 public int biYPelsPerMeter; 639 public int biClrUsed; 640 public int biClrImportant; 641 } 642 //========================================================================================================================================= 643 644 //======================================================BitmapInfo结构===================================================================== 645 //BitmapInfo 位图信息 646 [StructLayout(LayoutKind.Sequential)] 647 public struct BITMAPINFO 648 { 649 public BITMAPINFOHEADER bmiHeader; 650 public int bmiColors; 651 } 652 653 //=====================================================CAPTUREPARMS结构====================================================================== 654 //CAPTUREPARMS 包含控制视频流捕获过程的参数,如捕获帧频、指定键盘或鼠标键以终止捕获、捕获时间限制等; 655 [StructLayout(LayoutKind.Sequential)] 656 public struct CAPTUREPARMS 657 { 658 public int dwRequestMicroSecPerFrame; // 期望的桢播放率,以毫秒为单位,默认为66667,相当于15桢每秒。 659 public bool fMakeUserHitOKToCapture; // Show "Hit OK to cap" dlg?开始捕获标志位,如果值为真,则在开始捕获前要产生一个询问对话框,默认为假。 660 public uint wPercentDropForError; //所允许的最大丢桢百分比,可以从0变化到100,默认值为10。 661 public bool fYield; /*另起线程标志位,如果为真,则程序重新启动一个线程用于视频流的捕获,默认值是假。 662 但是如果你是为了真,你必须要在程序中处理一些潜在的操作,因为当视频捕获时,其他操作并没有被屏蔽。*/ 663 public int dwIndexSize; // 在AVI文件中所允许的最大数目的索引项(32K) 664 public uint wChunkGranularity; // AVI文件的逻辑尺寸,以字节为单位。如果值是0,则说明该尺寸渐增 在 Win32程序中无用。(2K) 665 public bool fUsingDOSMemory; // Use DOS buffers? 666 public uint wNumVideoRequested; // 所被允许分配的最大视频缓存 667 public bool fCaptureAudio; // 音频标志位,如果音频流正在捕获,则该值为真。 668 public uint wNumAudioRequested; // 最大数量的音频缓存,默认值为10。 669 public uint vKeyAbort; // 终止流捕获的虚拟键盘码,默认值为VK_ESCAPE 670 [MarshalAs(UnmanagedType.Bool)] 671 public bool fAbortLeftMouse; // 终止鼠标左键标志位,如果该值为真,则在流捕获过程中如果点击鼠标左键则该捕获终止,默认值为真。 672 public bool fAbortRightMouse; // Abort on right mouse? 673 public bool fLimitEnabled; // 捕获操作时间限制,如果为真,则时间到了以后捕获操作终止,默认为假 674 public uint wTimeLimit; // 具体终止时间,只有 fLimitEnabled是真时.该位才有效 675 public bool fMCIControl; // Use MCI video source? 676 public bool fStepMCIDevice; // Step MCI device?MCI 设备标志。 677 public int dwMCIStartTime; // Time to start in MS 678 public int dwMCIStopTime; // Time to stop in MS 679 public bool fStepCaptureAt2x; // Perform spatial averaging 2x 680 public int wStepCaptureAverageFrames; // 当基于平均采样来创建桢时,桢的采样时间,典型值是5 681 public int dwAudioBufferSize; // 音频缓存的尺寸,如果用默认值0,缓存尺寸是最大0.5秒,或10k字节。 682 public int fDisableWriteCache; // Attempt to disable write cache 683 public int AVStreamMaster; //音视频同步标志。 684 } 685 //========================================================================================================================================= 686 687 //=================================================CAPDRIVERCAPS结构======================================================================= 688 //CAPDRIVERCAPS定义了捕获驱动器的能力,如有无视频叠加能力、有无控制视频源、视频格式的对话框等; 689 [StructLayout(LayoutKind.Sequential)] 690 public struct CAPDRIVERCAPS 691 { 692 [MarshalAs(UnmanagedType.U2)] 693 public UInt16 wDeviceIndex; //捕获驱动器的索引值,该值可以由0到9变化。 694 [MarshalAs(UnmanagedType.Bool)] 695 public bool fHasOverlay; // 视频叠加标志,如果设备支持视频叠加这该位是真。 696 [MarshalAs(UnmanagedType.Bool)] 697 public bool fHasDlgVideoSource; //视频资源对话框标志位,如果设备支持视频选择、控制对话框,该值为真。 698 [MarshalAs(UnmanagedType.Bool)] 699 public bool fHasDlgVideoFormat; //视频格式对话框标志位,如果设备支持对视频格式对话框的选择,该位真。 700 [MarshalAs(UnmanagedType.Bool)] 701 public bool fHasDlgVideoDisplay; //视频展示对话框标志位,如果设备支持对视频捕获缓存区的重新播放,该位是真。 702 [MarshalAs(UnmanagedType.Bool)] 703 public bool fCaptureInitialized; //捕获安装标志位,如果捕获驱动器已经成功连接,该值为真。 704 //[MarshalAs(UnmanagedType.Bool)] 705 public bool fDriverSuppliesPalettes; //驱动器调色板标志位,如果驱动器能创建调色板,则该位是真。 706 [MarshalAs(UnmanagedType.I4)] 707 public int hVideoIn; 708 [MarshalAs(UnmanagedType.I4)] 709 public int hVideoOut; 710 [MarshalAs(UnmanagedType.I4)] 711 public int hVideoExtIn; 712 [MarshalAs(UnmanagedType.I4)] 713 public int hVideoExtOut; 714 } 715 //========================================================================================================================================= 716 717 718 //=====================================================CAPSTATUS结构======================================================================== 719 //CAPSTATUS定义了捕获窗口的当前状态,如图像的宽、高等; 720 [StructLayout(LayoutKind.Sequential)] 721 public struct CAPSTATUS 722 { 723 public int uiImageWidth; //图像宽度 724 public int uiImageHeight; //图像高度 725 public bool fLiveWindow; //活动窗口标记,如果窗口正以预览的方式展示图像,那么该值为真 726 public bool fOverlayWindow; //叠加窗口标志位,如果正在使用硬件叠加,则该位是真。 727 public bool fScale; //输入所放标志位,如果窗口是正在缩放视频到客户区,那么该位是真。当使用硬件叠加时,改位无效。 728 public Point ptScroll; //被展示在窗口客户区左上角的那个象素的x、y坐标偏移量。 729 public bool fUsingDefaultPalette; //默认调色板标志位,如果捕获窗口正在使用当前默认调色板,该值为真 730 public bool fAudioHardware; // 音频硬件标志位,如果系统已经安装了音频硬件,该值为真。 731 public bool fCapFileExists; //捕获文件标志位,如果一个捕获文件已经被创建,该值为真 732 public int dwCurrentVideoFrame; // 当前或最近流捕获过程中,所处理的桢的数目。包括丢弃的桢。 733 public int dwCurrentVideoFramesDropped;//当前流捕获过程中丢弃的桢的数目。 734 public int dwCurrentWaveSamples; // # of wave samples cap\'td 735 public int dwCurrentTimeElapsedMS; // 从当前流捕获开始计算,程序所用的时间,以毫秒为单位。 736 public IntPtr hPalCurrent; // 当前剪切板的句柄。 737 public bool fCapturingNow; // 捕获标志位,当捕获是正在进行时,改位是真 738 public int dwReturn; // 错误返回值,当你的应用程序不支持错误回调函数时可以应用改位 739 public int wNumVideoAllocated; // 被分配的视频缓存的数目。 740 public int wNumAudioAllocated; // 被分配的音频缓存的数目。 741 } 742 //========================================================================================================================================= 743 744 745 #endregion 结构 VIDEOHDR|BITMAPINFOHEADER|BITMAPINFO|CAPTUREPARMS|CAPDRIVERCAPS|CAPSTATUS 746 747 } 748 public class cVideo //视频类 749 { 750 public bool flag = true; 751 private IntPtr lwndC; //保存无符号句柄 752 private IntPtr mControlPtr; //保存管理指示器 753 private int mWidth; 754 private int mHeight; 755 public delegate void RecievedFrameEventHandler(byte[] data); 756 public event RecievedFrameEventHandler RecievedFrame; 757 758 public VideoAPI.CAPTUREPARMS Capparms; 759 private VideoAPI.FrameEventHandler mFrameEventHandler; 760 public VideoAPI.CAPDRIVERCAPS CapDriverCAPS;//捕获驱动器的能力,如有无视频叠加能力、有无控制视频源、视频格式的对话框等; 761 public VideoAPI.CAPSTATUS CapStatus;//该结构用于保存视频设备捕获窗口的当前状态,如图像的宽、高等 762 string strFileName; 763 public cVideo(IntPtr handle, int width, int height) 764 { 765 CapDriverCAPS = new VideoAPI.CAPDRIVERCAPS();//捕获驱动器的能力,如有无视频叠加能力、有无控制视频源、视频格式的对话框等; 766 CapStatus = new VideoAPI.CAPSTATUS();//该结构用于保存视频设备捕获窗口的当前状态,如图像的宽、高等 767 mControlPtr = handle; //显示视频控件的句柄 768 mWidth = width; //视频宽度 769 mHeight = height; //视频高度 770 } 771 /// <summary> 772 /// 打开视频设备 773 /// </summary> 774 public bool StartWebCam() 775 { 776 //byte[] lpszName = new byte[100]; 777 //byte[] lpszVer = new byte[100]; 778 //VideoAPI.capGetDriverDescriptionA(0, lpszName, 100, lpszVer, 100); 779 //this.lwndC = VideoAPI.capCreateCaptureWindowA(lpszName, VideoAPI.WS_CHILD | VideoAPI.WS_VISIBLE, 0, 0, mWidth, mHeight, mControlPtr, 0); 780 //if (VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_DRIVER_CONNECT, 0, 0)) 781 //{ 782 // VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SET_PREVIEWRATE, 100, 0); 783 // VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SET_PREVIEW, true, 0); 784 // return true; 785 //} 786 //else 787 //{ 788 // return false; 789 //} 790 this.lwndC = VideoAPI.capCreateCaptureWindow("", VideoAPI.WS_CHILD | VideoAPI.WS_VISIBLE, 0, 0, mWidth, mHeight, mControlPtr, 0);//AVICap类的捕捉窗口 791 VideoAPI.FrameEventHandler FrameEventHandler = new VideoAPI.FrameEventHandler(FrameCallback); 792 VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_SET_CALLBACK_ERROR, 0, 0);//注册错误回调函数 793 VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_SET_CALLBACK_STATUS, 0, 0);//注册状态回调函数 794 VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);//注册视频流回调函数 795 VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_SET_CALLBACK_FRAME, 0, FrameEventHandler);//注册帧回调函数 796 797 //if (!CapDriverCAPS.fCaptureInitialized)//判断当前设备是否被其他设备连接已经连接 798 //{ 799 800 if (VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_DRIVER_CONNECT, 0, 0)) 801 { 802 //----------------------------------------------------------------------- 803 VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_DRIVER_GET_CAPS, VideoAPI.SizeOf(CapDriverCAPS), ref CapDriverCAPS);//获得当前视频 CAPDRIVERCAPS定义了捕获驱动器的能力,如有无视频叠加能力、有无控制视频源、视频格式的对话框等; 804 VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_GET_STATUS, VideoAPI.SizeOf(CapStatus), ref CapStatus);//获得当前视频流的尺寸 存入CapStatus结构 805 806 VideoAPI.BITMAPINFO bitmapInfo = new VideoAPI.BITMAPINFO();//设置视频格式 (height and width in pixels, bits per frame). 807 bitmapInfo.bmiHeader = new VideoAPI.BITMAPINFOHEADER(); 808 bitmapInfo.bmiHeader.biSize = VideoAPI.SizeOf(bitmapInfo.bmiHeader); 809 bitmapInfo.bmiHeader.biWidth = mWidth; 810 bitmapInfo.bmiHeader.biHeight = mHeight; 811 bitmapInfo.bmiHeader.biPlanes = 1; 812 bitmapInfo.bmiHeader.biBitCount = 24; 813 VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_SET_PREVIEWRATE, 40, 0);//设置在PREVIEW模式下设定视频窗口的刷新率 设置每40毫秒显示一帧,即显示帧速为每秒25帧 814 VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_SET_SCALE, 1, 0);//打开预览视频的缩放比例 815 VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_SET_VIDEOFORMAT, VideoAPI.SizeOf(bitmapInfo), ref bitmapInfo); 816 817 this.mFrameEventHandler = new VideoAPI.FrameEventHandler(FrameCallback); 818 this.capSetCallbackOnFrame(this.lwndC, this.mFrameEventHandler); 819 820 821 VideoAPI.CAPTUREPARMS captureparms = new VideoAPI.CAPTUREPARMS(); 822 VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_GET_SEQUENCE_SETUP, VideoAPI.SizeOf(captureparms), ref captureparms); 823 if (CapDriverCAPS.fHasOverlay) 824 { 825 VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_SET_OVERLAY, 1, 0);//启用叠加 注:据说启用此项可以加快渲染速度 826 } 827 VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_SET_PREVIEW, 1, 0);//设置显示图像启动预览模式 PREVIEW 828 VideoAPI.SetWindowPos(this.lwndC, 0, 0, 0, mWidth, mHeight, VideoAPI.SWP_NOZORDER | VideoAPI.SWP_NOMOVE);//使捕获窗口与进来的视频流尺寸保持一致 829 return true; 830 } 831 else 832 { 833 834 flag = false; 835 return false; 836 } 837 } 838 public void get() 839 { 840 VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_GET_SEQUENCE_SETUP, VideoAPI.SizeOf(Capparms), ref Capparms); 841 } 842 public void set() 843 { 844 VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_SET_SEQUENCE_SETUP, VideoAPI.SizeOf(Capparms), ref Capparms); 845 } 846 private bool capSetCallbackOnFrame(IntPtr lwnd, VideoAPI.FrameEventHandler lpProc) 847 { 848 return VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_SET_CALLBACK_FRAME, 0, lpProc); 849 } 850 /// <summary> 851 /// 关闭视频设备 852 /// </summary> 853 public void CloseWebcam() 854 { 855 VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_DRIVER_DISCONNECT, 0, 0); 856 } 857 /// <summary> 858 /// 拍照 859 /// </summary> 860 /// <param >要保存bmp文件的路径</param> 861 public void GrabImage(IntPtr hWndC, string path) 862 { 863 IntPtr hBmp = Marshal.StringToHGlobalAnsi(path); 864 VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SAVEDIB, 0, hBmp.ToInt32()); 865 } 866 public void StarKinescope(string path) 867 { 868 strFileName = path; 869 string dir = path.Remove(path.LastIndexOf("//")); 870 if (!File.Exists(dir)) 871 { 872 Directory.CreateDirectory(dir); 873 } 874 int hBmp = Marshal.StringToHGlobalAnsi(path).ToInt32(); 875 bool b = VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_FILE_SET_CAPTURE_FILE, 0, hBmp); 876 b = VideoAPI.SendMessage(this.lwndC, VideoAPI.WM_CAP_SEQUENCE, 0, 0); 877 } 878 /// <summary> 879 /// 停止录像 880 /// </summary> 881 public void StopKinescope() 882 { 883 VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_STOP, 0, 0); 884 } 885 private void FrameCallback(IntPtr lwnd, IntPtr lpvhdr) 886 { 887 VideoAPI.VIDEOHDR videoHeader = new VideoAPI.VIDEOHDR(); 888 byte[] VideoData; 889 videoHeader = (VideoAPI.VIDEOHDR)VideoAPI.GetStructure(lpvhdr, videoHeader); 890 VideoData = new byte[videoHeader.dwBytesUsed]; 891 VideoAPI.Copy(videoHeader.lpData, VideoData); 892 if (this.RecievedFrame != null) 893 this.RecievedFrame(VideoData); 894 } 895 } 896 897 }