CameraCaptureDialog 后必须手动按“确定”然后“退出”，才能拍照， 怎样使用 CameraCaptureDialog 实现自动、定时拍照呢？可以使用System.Windows.Forms.Timer 、SendMessage方法实现，Timer方法必须在主线程中。

 

实现代码：

public partial class Form1 : Form

{ /* [DllImport("CoreDll")] public static extern IntPtr FindWindow( string lpClassName, // class name string lpWindowName // window name ); */ [DllImport("CoreDll")] public static extern IntPtr SendMessage( IntPtr hWnd, // handle to destination window uint Msg, // message uint wParam, // first message parameter uint lParam // second message parameter );

[DllImport("CoreDll")]

public static extern IntPtr GetForegroundWindow();

System.Threading.Timer tmr;

public Form1()

{ InitializeComponent();

}

private void menuItem2_Click(object sender, EventArgs e)

{ Application.Exit(); }

private void menuItem1_Click(object sender, EventArgs e)

{

CameraCaptureDialog ccd = new CameraCaptureDialog();

ccd.Mode = CameraCaptureMode.Still;

object someState = new object();

TimerCallback tmrClbck = new TimerCallback(this.atTimer1); tmr = new System.Threading.Timer(tmrClbck, someState, 10* 1000, -1); if (ccd.ShowDialog() == DialogResult.OK) { pictureBox1.Image = new Bitmap(ccd.FileName); //MessageBox.Show("OK"); } }

private void atTimer1(object state) { Debug.WriteLine("Timer 1 On"); IntPtr hwnd = GetForegroundWindow(); SendMessage(hwnd, 0x100, 0x0d, 0xf20001);

object someState = new object();

TimerCallback tmrClbck = new TimerCallback(this.atTimer2); tmr = new System.Threading.Timer(tmrClbck, someState, 2 * 1000, -1); //tmr.Dispose(); }

private void atTimer2(object state)

{ Debug.WriteLine("Timer 2 On"); IntPtr hwnd = GetForegroundWindow(); SendMessage(hwnd, 0x101, 0x1b, 0xc0310001); tmr.Dispose(); } }

 

程序中发送的 message，不同的 device 不同，需要用 Remote Spy 去抓

使用Remote Spy的方法可参考：

 

参考：

 

     本文转自xyz_lmn51CTO博客，原文链接：http://blog.51cto.com/xyzlmn/818933，如需转载请自行联系原作者