/// <summary>
/// 开启摄像头
/// </summary>
public void StartWebCam() //开启摄像头
{
this.lwndC = AviCapture.capCreateCaptureWindow("", AviCapture.WS_CHILD | AviCapture.WS_VISIBLE, 0, 0,
mWidth, mHeight, mControlPtr, 0); //AVICap类的捕捉窗口
//AviCapture.FrameEventHandler FrameEventHandler = new AviCapture.FrameEventHandler(framecallback);
//AviCapture.SendMessage(this.lwndC, AviCapture.WM_CAP_SET_CALLBACK_ERROR, 0, 0);//注册错误回调函数
//AviCapture.SendMessage(this.lwndC, AviCapture.WM_CAP_SET_CALLBACK_STATUS, 0, 0);//注册状态回调函数
//AviCapture.SendMessage(this.lwndC, AviCapture.WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);//注册视频流回调函数
//AviCapture.SendMessage(this.lwndC, AviCapture.WM_CAP_SET_CALLBACK_FRAME, 0, FrameEventHandler);//注册帧回调函数
//if (!CapDriverCAPS.fCaptureInitialized)//判断当前设备是否被其他设备连接已经连接
//{
if (AviCapture.SendMessage(this.lwndC, AviCapture.WM_CAP_DRIVER_CONNECT, 0, 0))
{
//-----------------------------------------------------------------------
AviCapture.SendMessage(this.lwndC, AviCapture.WM_CAP_DRIVER_GET_CAPS, AviCapture.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；
AviCapture.SendMessage(this.lwndC, AviCapture.WM_CAP_GET_STATUS, AviCapture.SizeOf(CapStatus),
ref CapStatus); //获得当前视频流的尺寸 存入CapStatus结构
AviCapture.BITMAPINFO
bitmapInfo = new AviCapture.BITMAPINFO(); //设置视频格式 (height and width in pixels, bits per frame).
bitmapInfo.bmiHeader = new AviCapture.BITMAPINFOHEADER();
bitmapInfo.bmiHeader.biSize = AviCapture.SizeOf(bitmapInfo.bmiHeader);
bitmapInfo.bmiHeader.biWidth = mWidth;
bitmapInfo.bmiHeader.biHeight = mHeight;
bitmapInfo.bmiHeader.biPlanes = 1;
bitmapInfo.bmiHeader.biBitCount = 24;
AviCapture.SendMessage(this.lwndC, AviCapture.WM_CAP_SET_PREVIEWRATE, 34,
0); //设置在PREVIEW模式下设定视频窗口的刷新率 设置每34毫秒显示一帧，即显示帧速为每秒29帧
AviCapture.SendMessage(this.lwndC, AviCapture.WM_CAP_SET_SCALE, 1, 0); //打开预览视频的缩放比例
AviCapture.SendMessage(this.lwndC, AviCapture.WM_CAP_SET_VIDEOFORMAT, AviCapture.SizeOf(bitmapInfo),
ref bitmapInfo);
AviCapture.CAPTUREPARMS captureparms = new AviCapture.CAPTUREPARMS();
AviCapture.SendMessage(this.lwndC, AviCapture.WM_CAP_GET_SEQUENCE_SETUP,
AviCapture.SizeOf(captureparms), ref captureparms);
if (CapDriverCAPS.fHasOverlay)
{
AviCapture.SendMessage(this.lwndC, AviCapture.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
}
AviCapture.SendMessage(this.lwndC, AviCapture.WM_CAP_SET_PREVIEW, 1, 0); //设置显示图像启动预览模式 PREVIEW
AviCapture.SetWindowPos(this.lwndC, 0, 0, 0, mWidth, mHeight,
AviCapture.SWP_NOZORDER | AviCapture.SWP_NOMOVE); //使捕获窗口与进来的视频流尺寸保持一致
}
else
{
System.Windows.Forms.MessageBox.Show("未能连接设备，请检查设备连接及是否有其他程序占用！");
flag = false;
}
//}
//else
//{
// System.Windows.Forms.MessageBox.Show("未能连接设备，请检查设备连接及是否有其他程序占用！");
//}
}