我必须使用热键,它将在每个窗口和讲坛上工作。在winforms我用过:
RegisterHotKey(this.Handle, 9000, 0x0002, (int)Keys.F10);
和
UnregisterHotKey(this.Handle, 9000);
和
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
switch (m.Msg)
{
case 0x312:
switch (m.WParam.ToInt32())
{
case 9000:
//function to do
break;
}
break;
}
}
在我的WPF应用程序中,我尝试过:
AddHandler(Keyboard.KeyDownEvent, (KeyEventHandler)HandleKeyDownEvent);
和
private void HandleKeyDownEvent(object sender, KeyEventArgs e)
{
if (e.Key == Key.F11 && (Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
{
//function to do
}
}
但它仅在我的应用程序处于活动状态且位于顶部时才起作用,但在应用程序最小化时(例如)它不起作用。有什么方法可以做到吗?
答案 0 :(得分:28)
您可以使用与WinForms中相同的方法进行一些调整:
WindowInteropHelper
获取HWND
(而不是表单的Handle
属性)HwndSource
处理窗口消息(而不是覆盖表单的WndProc
)Key
中的WPF
枚举 - 它的值不是您想要的值完整代码:
[DllImport("User32.dll")]
private static extern bool RegisterHotKey(
[In] IntPtr hWnd,
[In] int id,
[In] uint fsModifiers,
[In] uint vk);
[DllImport("User32.dll")]
private static extern bool UnregisterHotKey(
[In] IntPtr hWnd,
[In] int id);
private HwndSource _source;
private const int HOTKEY_ID = 9000;
protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
var helper = new WindowInteropHelper(this);
_source = HwndSource.FromHwnd(helper.Handle);
_source.AddHook(HwndHook);
RegisterHotKey();
}
protected override void OnClosed(EventArgs e)
{
_source.RemoveHook(HwndHook);
_source = null;
UnregisterHotKey();
base.OnClosed(e);
}
private void RegisterHotKey()
{
var helper = new WindowInteropHelper(this);
const uint VK_F10 = 0x79;
const uint MOD_CTRL = 0x0002;
if(!RegisterHotKey(helper.Handle, HOTKEY_ID, MOD_CTRL, VK_F10))
{
// handle error
}
}
private void UnregisterHotKey()
{
var helper = new WindowInteropHelper(this);
UnregisterHotKey(helper.Handle, HOTKEY_ID);
}
private IntPtr HwndHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
const int WM_HOTKEY = 0x0312;
switch(msg)
{
case WM_HOTKEY:
switch(wParam.ToInt32())
{
case HOTKEY_ID:
OnHotKeyPressed();
handled = true;
break;
}
break;
}
return IntPtr.Zero;
}
private void OnHotKeyPressed()
{
// do stuff
}