Question

我正在尝试向按下Ctrl和向上箭头的窗口发送消息。我已经掌握了基础知识，我可以发送记录空间键的印刷机。但我似乎无法让 ctrl + ↑正常工作。选择的代码片段：

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]
static extern IntPtr SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

现在这适用于发送空间：

public static void SendKeyPress(IntPtr handle, VKeys key)
{
    SendMessage(handle, (int) WMessages.WM_KEYDOWN, (int) key, 0);
    SendMessage(handle, (int)WMessages.WM_KEYUP, (int)key, 0);
}

但这不适用于将 Ctrl + ↑发送到VLC以增加音量：

public static void SendKeyPress(IntPtr handle, VKeys key, bool control)
{
    int lParamKeyDown = 0;
    lParamKeyDown |= 1;
    lParamKeyDown |= 1 << 24;

    int lParamKeyUp = lParamKeyDown;
    lParamKeyUp |= 1 << 30;
    lParamKeyUp |= 1 << 31; //it was down before

    int lParamCtrlDown = lParamKeyDown;
    int lParamCtrlUp = lParamKeyUp;

    lParamKeyDown |= (int)MapVirtualKey((uint)key, 0) << 16;
    lParamKeyUp |= (int)MapVirtualKey((uint)key, 0) << 16;
    lParamCtrlDown |= (int)MapVirtualKey((uint)VKeys.VK_CONTROL, 0) << 16;
    lParamCtrlUp |= (int)MapVirtualKey((uint)VKeys.VK_CONTROL, 0) << 16;

    IntPtr controlPtr = new IntPtr((int)VKeys.VK_CONTROL);
    IntPtr lParamCtrlDownPtr = new IntPtr(lParamCtrlDown);
    IntPtr lParamCtrlUpPtr = new IntPtr(lParamCtrlUp);
    IntPtr lParamKeyDownPtr = new IntPtr(lParamKeyDown);
    IntPtr lParamKeyUpPtr = new IntPtr(lParamKeyUp);
    IntPtr keyPtr = new IntPtr((int)key);
    object o = new object();
    HandleRef wndRef = new HandleRef(o, handle);
    PostMessage(wndRef, (uint)WMessages.WM_KEYDOWN, controlPtr, lParamCtrlDownPtr);
    PostMessage(wndRef, (uint) WMessages.WM_KEYDOWN, keyPtr, lParamKeyDownPtr);

    PostMessage(wndRef, (uint) WMessages.WM_KEYUP, controlPtr, lParamCtrlUpPtr);
    PostMessage(wndRef, (uint) WMessages.WM_KEYUP, keyPtr, lParamKeyUpPtr);
 }

我错过了什么？

EDIT3：消息完全相同，因为我切换到PostMessage后没有额外的消息，但VLC仍然不会增加或减少音量。

它不仅仅是VLC，即使消息在Spy ++中看起来完全相同，Spotify也不会接受相同的命令。

Answer 1

我没有很好的方法来测试它，但是如果这两行的顺序会有效：

SendMessage(handle, (int) WMessages.WM_KEYDOWN, (int) key, 0);
SendMessage(handle, (int) WMessages.WM_KEYDOWN, (int)VKeys.VK_CONTROL, 0);

更改为：

SendMessage(handle, (int) WMessages.WM_KEYDOWN, (int)VKeys.VK_CONTROL, 0);
SendMessage(handle, (int) WMessages.WM_KEYDOWN, (int) key, 0);

这样控制键关闭基本上包裹了另一个键的压力？

Answer 2

我找到了一个有效的解决方案。您使用SetKeyboardState功能按下控制键，然后您可以发送您想要的任何键。这个Delphi代码将Ctrl + Right发送到Memo组件。

var
  s: TKeyboardState;
  PrevState: byte;
begin
  GetKeyboardState(s);
  PrevState := s[VK_CONTROL];
  s[VK_CONTROL] := 128;
  SetKeyboardState(s);
  SendMessage(Memo1.Handle, WM_KEYDOWN, VK_RIGHT, 0);
  s[VK_CONTROL] := PrevState;
  SetKeyboardState(s)
end;

Answer 3

我现在找到一种方法将Ctrl + Right（例如）发送到另一个进程的窗口。如果hEdit是窗口的句柄，则以下代码可以正常工作。

AttachThreadInput(GetCurrentThreadID, GetWindowThreadProcessId(hEdit, 0), true);
hEdit := SetFocus(hEdit);

keybd_event(VK_CONTROL, 0, 0, 0);
keybd_event(VK_RIGHT, 0, 0, 0);
keybd_event(VK_RIGHT, 0, KEYEVENTF_KEYUP, 0);
keybd_event(VK_CONTROL, 0, KEYEVENTF_KEYUP, 0);

SetFocus(hEdit); // restore focus
AttachThreadInput(GetCurrentThreadID, GetWindowThreadProcessId(hEdit, 0), false); // "Disconnect"

<强>更新

这种方法的缺点是焦点会在很短的时间内发生变化。事实上，我认为最好的解决方案是我之前和这篇文章的结合：

var
  s: TKeyboardState;
  PrevState: byte;

AttachThreadInput(GetCurrentThreadID, GetWindowThreadProcessId(hEdit, 0), true);

GetKeyboardState(s);
PrevState := s[VK_CONTROL];
s[VK_CONTROL] := 128;
SetKeyboardState(s);
SendMessage(hEdit, WM_KEYDOWN, VK_RIGHT, 0);
s[VK_CONTROL] := PrevState;
SetKeyboardState(s);

AttachThreadInput(GetCurrentThreadID, GetWindowThreadProcessId(hEdit, 0), false);

将Ctrl + Up发送到窗口

3 个答案: