發佈消息在用戶單擊鼠標按鈕之後

Question

我使用SetWindowsHookEx來監視另一個應用程序。當用戶在程序中單擊鼠標時，我使用PostMessage向程序發送消息。

我的問題是，有時我的郵件到達之前 WM_LBUTTONUP。如何確保我的郵件將在 WM_LBUTTONUP之後到達？

我用Gma.UserActivityMonitor監測和下面的代碼來發送消息：

HookManager.MouseUp += HookManagerMouseUp; 

void HookManagerMouseUp(object sender, MouseEventArgs e) 
{ 
    uint ret; 
    uint attachedThredId = GetCurrentThreadId(); 
    uint attachedProcessId = GetWindowThreadProcessId(ActiveWindow, out ret); 
    AttachThreadInputSafe(attachedThredId, attachedProcessId, true); 


    PostMessage(ActiveControlInWindow, Message.KeyDown, 'A', 0x1); 
    PostMessage(ActiveControlInWindow, Message.KeyUp, 'A', 0xC0010001); 

    AttachThreadInputSafe(attachedThredId, attachedProcessId, false); 
} 

我使用PostMessage的發送鍵擊，是因爲我想這樣做，即使主機應用程序是不活躍。

在Gma.UserActivityMonitor鉤如下：

s_MouseDelegate = MouseHookProc; 
s_MouseHookHandle = SetWindowsHookEx(
    WH_MOUSE_LL, 
    s_MouseDelegate, 
    Marshal.GetHINSTANCE(
    Assembly.GetExecutingAssembly().GetModules()[0]), 
    0); 

我使用間諜++監視到達給應用程序的消息。當信息以正確的順序到達我得到以下結果：

S WM_MOUSEACTIVATE hwndTopLevel:00030A46 nHittest:HTCLIENT uMsg:WM_LBUTTONDOWN 
R WM_MOUSEACTIVATE fuActivate:MA_ACTIVATE 
S WM_KILLFOCUS hwndGetFocus:00020A32 
R WM_KILLFOCUS 
S WM_IME_SETCONTEXT fSet:1 iShow:C000000F 
R WM_IME_SETCONTEXT 
S WM_SETFOCUS hwndLoseFocus:00030A46 
R WM_SETFOCUS 
P WM_LBUTTONDOWN fwKeys:MK_LBUTTON xPos:278 yPos:73 
S WM_ERASEBKGND hdc:0E010DEE 
R WM_ERASEBKGND fErased:True 
P WM_LBUTTONUP fwKeys:0000 xPos:278 yPos:73 
S WM_CAPTURECHANGED hwndNewCapture:00000000 
R WM_CAPTURECHANGED 
P WM_KEYDOWN nVirtKey:VK_OEM_5 cRepeat:1 ScanCode:00 fExtended:0 fAltDown:0 fRepeat:0 fUp:0 
P WM_KEYUP nVirtKey:VK_OEM_5 cRepeat:1 ScanCode:01 fExtended:0 fAltDown:0 fRepeat:1 fUp:1 
P WM_CHAR chCharCode:'167' (167) cRepeat:1 ScanCode:00 fExtended:0 fAltDown:0 fRepeat:0 fUp:0 
P WM_KEYDOWN nVirtKey:'2' cRepeat:1 ScanCode:00 fExtended:0 fAltDown:0 fRepeat:0 fUp:0 
P WM_KEYUP nVirtKey:'2' cRepeat:1 ScanCode:01 fExtended:0 fAltDown:0 fRepeat:1 fUp:1 
P WM_KEYDOWN nVirtKey:'2' cRepeat:1 ScanCode:00 fExtended:0 fAltDown:0 fRepeat:0 fUp:0 
P WM_KEYUP nVirtKey:'2' cRepeat:1 ScanCode:01 fExtended:0 fAltDown:0 fRepeat:1 fUp:1 
P WM_CHAR chCharCode:'50' (50) cRepeat:1 ScanCode:00 fExtended:0 fAltDown:0 fRepeat:0 fUp:0 
P WM_CHAR chCharCode:'50' (50) cRepeat:1 ScanCode:00 fExtended:0 fAltDown:0 fRepeat:0 fUp:0 
S WM_KILLFOCUS hwndGetFocus:(null) 
R WM_KILLFOCUS 
S WM_IME_SETCONTEXT fSet:0 iShow:C000000F 
R WM_IME_SETCONTEXT 

當消息順序錯誤我得到下面的結果到達（請注意，WM_LBUTTONUP到達WM_CHAR已處理後）：

S WM_MOUSEACTIVATE hwndTopLevel:00030A46 nHittest:HTCLIENT uMsg:WM_LBUTTONDOWN 
R WM_MOUSEACTIVATE fuActivate:MA_ACTIVATE 
S WM_KILLFOCUS hwndGetFocus:00020A32 
R WM_KILLFOCUS 
S WM_IME_SETCONTEXT fSet:1 iShow:C000000F 
R WM_IME_SETCONTEXT 
S WM_SETFOCUS hwndLoseFocus:00030A46 
R WM_SETFOCUS 
P WM_LBUTTONDOWN fwKeys:MK_LBUTTON xPos:329 yPos:166 
S WM_ERASEBKGND hdc:1E0117FD 
R WM_ERASEBKGND fErased:True 
P WM_KEYDOWN nVirtKey:VK_OEM_5 cRepeat:1 ScanCode:00 fExtended:0 fAltDown:0 fRepeat:0 fUp:0 
P WM_KEYUP nVirtKey:VK_OEM_5 cRepeat:1 ScanCode:01 fExtended:0 fAltDown:0 fRepeat:1 fUp:1 
P WM_KEYDOWN nVirtKey:'2' cRepeat:1 ScanCode:00 fExtended:0 fAltDown:0 fRepeat:0 fUp:0 
P WM_KEYUP nVirtKey:'2' cRepeat:1 ScanCode:01 fExtended:0 fAltDown:0 fRepeat:1 fUp:1 
P WM_KEYDOWN nVirtKey:'2' cRepeat:1 ScanCode:00 fExtended:0 fAltDown:0 fRepeat:0 fUp:0 
P WM_KEYUP nVirtKey:'2' cRepeat:1 ScanCode:01 fExtended:0 fAltDown:0 fRepeat:1 fUp:1 
P WM_CHAR chCharCode:'167' (167) cRepeat:1 ScanCode:00 fExtended:0 fAltDown:0 fRepeat:0 fUp:0 
P WM_CHAR chCharCode:'50' (50) cRepeat:1 ScanCode:00 fExtended:0 fAltDown:0 fRepeat:0 fUp:0 
P WM_CHAR chCharCode:'50' (50) cRepeat:1 ScanCode:00 fExtended:0 fAltDown:0 fRepeat:0 fUp:0 
P WM_LBUTTONUP fwKeys:0000 xPos:329 yPos:166 
S WM_CAPTURECHANGED hwndNewCapture:00000000 
R WM_CAPTURECHANGED 
S WM_KILLFOCUS hwndGetFocus:(null) 
R WM_KILLFOCUS 
S WM_IME_SETCONTEXT fSet:0 iShow:C000000F 
R WM_IME_SETCONTEXT 

我可以看到它是隨機的，當一個或另一個發生。如果我在發佈消息之前添加延遲，它會起作用。但我不想使用延遲。

Answer 1

有一些的，你看到的這種行爲（其他掛鉤，系統模態循環）的原因，但最明顯的一個就是WM_nBUTTONUP消息發佈到線程之前鉤子得到通知。

您可以獲得所需行爲的唯一確定方法是使用全局掛鉤，以便您在正在執行的過程中獲取消息。很可能您需要使用WH_CALLWNDPROCRET掛鉤，以便在處理郵件的之後，您的掛接被調用。

Answer 2

使用MOUSE_LL掛鉤，並在收到WM_*BUTTONUP時發佈消息。

http://msdn.microsoft.com/en-us/library/ms644986(VS.85).aspx