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.Net里一个用于驱动摄像头的类

作者 凌众技术 来源 互联网 浏览 发布时间 2012-01-14

 



 

  mLeft = left;
  mTop = top;
  }

  [DllImport("avicap32.dll")] 
  private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);
  
  [DllImport("avicap32.dll")]
  private static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize );
  [DllImport("User32.dll")] 
  private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, long lParam);

  /// <summary>
  /// 开始显示图像
  /// </summary>
  public void Start()
  {
  if (bStat)
  return;
  
  bStat = true;
  byte[] lpszName = new byte[100];
  
  hWndC = capCreateCaptureWindowA(lpszName,WS_CHILD|WS_VISIBLE ,mLeft,mTop,mWidth,mHeight,mControlPtr,0);

  if (hWndC.ToInt32() != 0)
  {
  SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
  SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);
  SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);
  SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);
  SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);
  SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0);
  SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);
  SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);
  }

  return;

  }

  /// <summary>
  /// 停止显示
 


 



 

  /// </summary>
  public void Stop()
  {
  SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
  bStat = false;
  }

  /// <summary>
  /// 抓图
  /// </summary>
  /// <param name="path">要保存bmp文件的路径</param>
  public void GrabImage(string path)
  {
  
  IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
  SendMessage(hWndC,WM_CAP_SAVEDIB,0,hBmp.ToInt64());

  }

  /// <summary>
  /// 录像
  /// </summary>
  /// <param name="path">要保存avi文件的路径</param>
  public void Kinescope(string path)
  {
  IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
  SendMessage(hWndC,WM_CAP_FILE_SET_CAPTURE_FILEA,0,hBmp.ToInt64());
  SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);
  }

  /// <summary>
  /// 停止录像
  /// </summary>
  public void StopKinescope()
  {
  SendMessage(hWndC, WM_CAP_STOP, 0, 0);
  }

  }
  }

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