掛鉤後沒有收到Window Procedure消息WH_CALLWNDPROC

Question

我試過使用全局鉤子，但hookprocedure只接收到我的程序線程的窗口過程消息，並且針對特定應用程序（線程）根本沒有消息。

我正確地使用DLL中的函數來處理非本地鉤子。這是我的應用程序代碼。

#include <Windows.h> 
#include <stdio.h> 

HINSTANCE hinst; 
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam); 

int main() { 
    HWND notepad = FindWindow(NULL, L"Untitled - Notepad"); 

    if (!notepad) 
     return 0; 

    hinst = GetModuleHandle(NULL); 

    // create a window class: 
    WNDCLASS wc = {}; 
    wc.lpfnWndProc = WindowProc; 
    wc.hInstance = hinst; 
    wc.lpszClassName = L"hooking"; 

    // register class with operating system: 
    RegisterClass(&wc); 

    // create and show window: 
    HWND hwnd = CreateWindow(L"hooking", L"hooking", WS_OVERLAPPEDWINDOW, 0, 0, 500, 400, NULL, NULL, hinst, NULL); 

    if (hwnd == NULL) { 
     return 0; 
    } 

    ShowWindow(hwnd, SW_SHOW); 

    DWORD threadID = GetWindowThreadProcessId(notepad, NULL); 

    HINSTANCE hinstDLL = LoadLibrary(TEXT("..\\Debug\\ProcHookDLL.dll")); 

    void (*AttachHookProc)(DWORD); 
    AttachHookProc = (void (*)(DWORD)) GetProcAddress(hinstDLL, "AttachHook"); 
    AttachHookProc(threadID); 

    // handle messages: 
    MSG msg = {}; 

    while(GetMessage(&msg, hwnd, 0, 0)) { 
     TranslateMessage(&msg); 
     DispatchMessage(&msg); 
    } 

    printf("Done execution... press any key to exit"); 
    char garbage = getchar(); 
    return 0; 
} 


LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) { 
    if (uMsg == WM_DESTROY) { 
     PostQuitMessage(0); 
    } 
    return DefWindowProc(hwnd, uMsg, wParam, lParam); 
} 

這是DLL的代碼。我有沒有收到任何消息的原因？

#include <Windows.h> 
#include <stdio.h> 

// TODO: create a mutex so this can only be loaded once 
HMODULE thisModule; 
HHOOK hook; 
LRESULT CALLBACK LaunchListener(int nCode, WPARAM wParam, LPARAM lParam); 

BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved) 
{ 
    thisModule = hModule; 

    // Very restricted set of things that can be done in DllMain, refer to documentation 
    // before adding anything here. 

    switch (ul_reason_for_call) { 
    case DLL_PROCESS_ATTACH: 
    case DLL_THREAD_ATTACH: 
     break; 
    case DLL_THREAD_DETACH: 
    case DLL_PROCESS_DETACH: 
     break; 
    } 
    return TRUE; 
} 

#ifdef __cplusplus // If used by C++ code, 
extern "C" {   // we need to export the C interface 
#endif 
//window message loop is necessary for hooks to work? (didn't work with console app) 
//provide function pointer to execute when notepad is launched. 
__declspec(dllexport) void AttachHook(DWORD threadID) { 
    hook = SetWindowsHookEx(WH_CALLWNDPROC, LaunchListener, thisModule, threadID); 
} 
#ifdef __cplusplus 
} 
#endif 

LRESULT CALLBACK LaunchListener(int nCode, WPARAM wParam, LPARAM lParam) { 
    // process event here 
    if (nCode >= 0) { 
     //wparam specifies if the message was sent by the current thread or not. 
     CWPSTRUCT * cwp = (CWPSTRUCT *)lParam; 
     wchar_t windowName[256]; 
     GetWindowText(cwp->hwnd, windowName, 256); 
     wprintf(L"%#8X: %s\n", cwp->message, windowName); 
     if (cwp->message == WM_CREATE) { 
      __debugbreak(); 
      wchar_t moduleName[256]; 
      //cwp->hwnd 
      //GetModuleFileName(0, moduleName, 256); 
      GetWindowText(cwp->hwnd, moduleName, 256); 
      int x = 0; 
      x++; 
     } 
    } 

    return CallNextHookEx(NULL, nCode, wParam, lParam); 
} 

Answer 1

沒有問題，掛鉤安裝正確。但是我不知道鉤子過程從窗口過程已經獲得消息的過程的上下文中運行。

Answer 2

看起來它應該工作。只是檢查一些建議。

• 32位DLL只會掛鉤32位進程。而一個64位DLL只會掛鉤64位進程。
• 嘗試將dwThreadId設置爲0以創建全局鉤子，以查看它是否以此方式工作。
• 確保掛鉤DLL可以找到並且可以被目標進程讀取。