如有雷同，不胜荣幸，若转载，请注明
这个是大众普通方法，鉴于有网友和朋友问同样的问题，在这里将我的拙劣的代码关键部分贴出来，以便帮助更多的朋友们，不足之处甚多，我可以学习，交流，请教阁下
废话到此，直接上代码
private const int WS_CHILD = 0x40000000; //1073741824
private const int WS_VISIBLE = 0x10000000; //268435456
private const int WM_USER = 0x400; //1024
private const int WM_CAP_START = WM_USER; //1024
private const int WM_CAP_STOP = WM_CAP_START + 68; //1092
private const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10; //1034
private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11; //1035
private const int WM_CAP_SAVEDIB = WM_CAP_START + 25; //1049
private const int WM_CAP_GRAB_FRAME = WM_CAP_START + 60; //1084
private const int WM_CAP_SEQUENCE = WM_CAP_START + 62; //1086
private const int WM_CAP_FILE_SET_CAPTRUE_FILEA = WM_CAP_START + 20; //1044
private const int WM_CAP_SEQUENCE_NOFILE = WM_CAP_START + 63; //1087
private const int WM_CAP_CAPTURE_IMAGE_CLIPBOARD = WM_CAP_START + 30; //1054 复制捕捉的图像到剪切板
private const int WM_CAP_SET_OVERLAY = WM_CAP_START + 51; //1075
private const int WM_CAP_SET_PREVIEW = WM_CAP_START + 50; //1074
private const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START + 6; //1030
private const int WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START + 2; //1026
private const int WM_CAP_SET_CALLBACK_STATUSA = WM_CAP_START + 3; //1027
private const int WM_CAP_SET_CALLBACK_FRAME = WM_CAP_START + 5; //1029
private const int WM_CAP_SET_SCALE = WM_CAP_START + 53; //1077
private const int WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52; //1076
private const int WM_CAP_DLG_VIDEOSOURCE = WM_CAP_START + 42; //1066 选择摄像头
/// <summary>
/// 开启视频摄像头
/// </summary>
/// <returns></returns>
public static void Start()
{
if (bWorkStart)
{
return;
}
byte[] lpszName = new byte[100];
try
{
hWndC = Windows.capCreateCaptureWindow(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);
if (hWndC.ToInt32() != 0)
{
Windows.SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0); //设置返回视频流
Windows.SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0); //设置返回错误
Windows.SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0); //设置返回状态
//=====================这条比较慢=======================
Windows.SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0); //设备连接
//=====================================================
//Windows.SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0); //开始捕捉
//=====================================================
Windows.SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0); //设置比例
Windows.SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0); //设置预览速度
Windows.SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0); //设置叠加
Windows.SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0); //设置预览
bWorkStart = true;
}
//return true;
}
catch (Exception)
{
//return false;
}
//finally
//{
//写日志 Global.log.Write( “SendMessage “);
//LogClass.WriteLog("SendMessage");
//}
}
/// <summary>
/// 关闭视频摄像头
/// </summary>
public static void Stop()
{
Windows.SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
bWorkStart = false;
}
/// <summary>
/// 抓图或者拍照，然后保存到指定路径下
/// </summary>
/// <param name="path">要保存bmp文件的路径</param>
public static void GrabImage(string path)
{
IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
Windows.SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt32()); //0x41e
}
/// <summary>
/// 捕捉图像复制到剪切板
/// </summary>
/// <returns></returns>
public static bool CopyToClipBoard()
{
return Windows.SendMessage(hWndC, WM_CAP_CAPTURE_IMAGE_CLIPBOARD, 0, 0);
}
原文：http://www.cnblogs.com/ching2009/p/4293594.html