我的程序是当一个 USB 设备插入 / 拔出，并做它应该做什么捕获。
有一件烦人的事情：资源管理器打开一个窗口。猜猜自动播放是罪魁祸首。完全禁用该计算机上的自动播放不是一个选项，因此必须在此应用程序运行时将其禁用。
我发现了许多关于如何通过捕获 windows 消息来做到这一点的文章。这让下面的代码,它正在编译和触发 windowsmessages 的到来。但不幸的是,QueryCancelAutoPlay 似乎从未被调用。
protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
HwndSource source = PresentationSource.FromVisual(this) as HwndSource;
source.AddHook(WndProc);
}
private UInt32 queryCancelAutoPlay = 0;
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
static extern uint RegisterWindowMessage(string lpString);
private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (queryCancelAutoPlay == 0)
{
queryCancelAutoPlay = RegisterWindowMessage("QueryCancelAutoPlay");
}
if (msg == queryCancelAutoPlay)
{
return (IntPtr)1;
}
return IntPtr.Zero;
}
有什么想法吗？我在 win10 机器上开发这个。
0
public partial cl MainWindow : NavigationWindow
{
public int queryCancelAutoPlay = 0;
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
static extern int RegisterWindowMessage(string lpString);
public MainWindow()
{
InitializeComponent();
}
protected override void OnClosing(CancelEventArgs e)
{
base.OnClosing(e);
MainWindow_Closing(this, e);
}
protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
MainWindow_SourceInitialized(this, e);
}
private void MainWindow_SourceInitialized(object sender, EventArgs e)
{
Debug.WriteLine("Initialize MainWindow");
IntPtr windowHandle = (new WindowInteropHelper(this)).Handle;
HwndSource src = HwndSource.FromHwnd(windowHandle);
src.AddHook((WndProc));
}
private IntPtr WndProc(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
//if the QueryCancelAutoPlay message id has not been registered...
if (queryCancelAutoPlay == 0)
{
queryCancelAutoPlay = RegisterWindowMessage("QueryCancelAutoPlay");
Debug.WriteLine("cancel autoplay registered. msg id: " + queryCancelAutoPlay.ToString());
}
//if the window message id equals the QueryCancelAutoPlay message id
if (msg == queryCancelAutoPlay)
{
Debug.WriteLine("Autoplay cancelled");
queryCancelAutoPlay = 0;
handled = true;
return new IntPtr(1);
}
return new IntPtr(msg);
}
private void MainWindow_Closing(object sender, CancelEventArgs e)
{
Debug.WriteLine("Close MainWindow");
HwndSource source = (HwndSource)HwndSource.FromVisual(this);
source.RemoveHook(new HwndSourceHook(this.WndProc));
}
}
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