public int GetJpegImage(ref byte[] imageBuf)
{
// static extern int GetJpegImage(IntPtr hChannelHandle, byte[] ImageBuf, out int Size, uint nQuality);
imageBuf = new byte[800 * 600 * 2];
uint size = 800 * 600 * 2;
HCNetSDK.NET_DVR_JPEGPARA jpegPara = new HCNetSDK.NET_DVR_JPEGPARA();
jpegPara.wPicSize = 2;
jpegPara.wPicQuality = 1;
string filename = string.Format("C:\\Picture\\{0}_{1}.jpg", _cameraInfo.Name, Guid.NewGuid().ToString());
//NET_DVR_CaptureJPEGPicture_NEW(LONG lUserID, LONG lChannel, LPNET_DVR_JPEGPARA lpJpegPara, char *sJpegPicBuffer, DWORD dwPicSize, LPDWORD lpSizeReturned);
//HCNetSDK.NET_DVR_CaptureJPEGPicture_NEW(_deviceInfo.ServiceID, _cameraInfo.PlayHandle,jpegPara, imageBuf,100, out size);
HCNetSDK.NET_DVR_CapturePicture(_cameraInfo.PlayHandle, filename);
// bool brtn= HCNetSDK.NET_DVR_CaptureJPEGPicture(_deviceInfo.ServiceID, _cameraInfo.PlayHandle,ref jpegPara, filename);
FileStream stream = new FileStream(filename, FileMode.Open);
BinaryReader br = new BinaryReader(stream);
imageBuf = br.ReadBytes((int)stream.Length);
br.Close();
return((int)size);
}