转自：http://blog.csdn.net/xyz_lmn/archive/2010/02/26/5329308.aspx
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