Question

我正在尝试在屏幕上（客户端窗口之外）处理鼠标事件。我使用纯Win32 API。我用SetWindowHookEx函数创建了单独的DLL，并将其引用到我的Win32应用程序。但它只处理窗口事件，当鼠标在窗口或窗口之外不活动时没有任何反应。

// Hook.h

#ifndef _DEFINED_44E531B1_14D3_11d5_A025_006067718D04
#define _DEFINED_44E531B1_14D3_11d5_A025_006067718D04
#if _MSC_VER > 1000
#pragma once
#endif
#ifdef __cplusplus


extern "C" {
#endif // __cplusplus
#ifdef _COMPILING_44E531B1_14D3_11d5_A025_006067718D04
#define LIBSPEC __declspec(dllexport)
#else
#define LIBSPEC __declspec(dllimport)
#endif // _COMPILING_44E531B1_14D3_11d5_A025_006067718D04




   LIBSPEC BOOL InstallHook(HWND hWnd);
   LIBSPEC BOOL UnInstallHook(HWND hWnd);





 #undef LIBSPEC
#ifdef __cplusplus
}

#define UWM_MOUSEMOVE_MSG (L"UWM_MOUSEMOVE_USER_MSG")
#define UWM_MOUSELBUTTONUP_MSG ( L"UWM_MOUSELBUTTONUP_USER_MSG" )
#define UWM_MOUSELBUTTONDOWN_MSG ( L"UWM_MOUSELBUTTONDOWN_USER_MSG" )
#define UWM_MOUSERBUTTONUP_MSG ( L"UWM_MOUSERBUTTONUP_USER_MSG" )
#define UWM_MOUSERBUTTONDOWN_MSG ( L"UWM_MOUSERBUTTONDOWN_USER_MSG" )
#define UWM_MOUSELDBCLICK_MSG ( L"UWM_MOUSERBUTTONDOWN_USER_MSG" )


#endif // __cplusplus

#endif // _DEFINED_44E531B1_14D3_11d5_A025_006067718D04

// Hook.cpp

// Hook.cpp：定义DLL应用程序的导出函数。 //

#include "stdafx.h"
#include "Hook.h"

#pragma data_seg()
#pragma comment(linker, "/section:.Segment,rws")   


HWND hWndServer = NULL;
UINT UWM_MOUSEMOVE;
UINT UWM_MOUSELBUTTONUP;
UINT UWM_MOUSELBUTTONDOWN;
UINT UWM_MOUSERBUTTONUP;
UINT UWM_MOUSERBUTTONDOWN;
UINT UWM_MOUSELDBCLICK;


HINSTANCE hInst;
//HWND hWndServer = NULL;
HHOOK hook;

static LRESULT CALLBACK MouseMsgProc(UINT nCode, WPARAM wParam, LPARAM lParam)
{
    if(nCode < 0)
    { 
        CallNextHookEx(hook, nCode, wParam, lParam);
        return 0;
    }
    LPMSG msg = (LPMSG)lParam;
    switch( msg->message  )
    {
        case WM_LBUTTONDBLCLK:
        SendMessage( hWndServer, UWM_MOUSELDBCLICK, 0 , 0);
        break;
        case WM_MOUSEMOVE:
            SendMessage( hWndServer, UWM_MOUSEMOVE, 0, 0);
        break;

        case WM_NCMOUSEMOVE:
            SendMessage( hWndServer, UWM_MOUSEMOVE, 0, 0);
        break;
        case WM_LBUTTONDOWN:
            SendMessage( hWndServer, UWM_MOUSELBUTTONDOWN, 0 , 0 );
        break;
        case WM_NCLBUTTONDOWN:
            SendMessage( hWndServer, UWM_MOUSELBUTTONDOWN, 0 , 0);
        break;
        case WM_LBUTTONUP:
            SendMessage( hWndServer, UWM_MOUSELBUTTONUP, 0 , 0 );
        break;
        case WM_NCLBUTTONUP:
            SendMessage( hWndServer, UWM_MOUSELBUTTONUP, 0 , 0);
        break;
        case WM_RBUTTONDOWN:
            SendMessage( hWndServer, UWM_MOUSERBUTTONDOWN, 0 , 0 );
        break;
        case WM_NCRBUTTONDOWN:
            SendMessage( hWndServer, UWM_MOUSERBUTTONDOWN, 0 , 0);
        break;
        case WM_RBUTTONUP:
            SendMessage( hWndServer, UWM_MOUSERBUTTONUP, 0 , 0 );
        break;
        case WM_NCRBUTTONUP:
            SendMessage( hWndServer, UWM_MOUSERBUTTONUP, 0 , 0);
        break;

    default:
        break;
    }
    return CallNextHookEx(hook, nCode, wParam, lParam);
} 

__declspec(dllexport)  BOOL InstallHook( HWND  hWndParent)
{
    if(hWndServer != NULL)
    return FALSE; // already hooked!
    hook = SetWindowsHookEx( WH_GETMESSAGE, (HOOKPROC)MouseMsgProc, 
                             hInst, 0);
if(hook != NULL)
    { 
        hWndServer = hWndParent;
        return TRUE;
    } 
    return FALSE;
}


__declspec(dllexport) BOOL UnInstallHook(   HWND hWndParent )
{
     if(hWndParent != hWndServer || hWndParent == NULL)
    return FALSE;
     BOOL unhooked = UnhookWindowsHookEx(hook);
     if(unhooked)
    hWndServer = NULL;
     return unhooked;
    return TRUE;
}

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
        hInst = hModule;
            UWM_MOUSEMOVE = ::RegisterWindowMessage(UWM_MOUSEMOVE_MSG);
            UWM_MOUSELBUTTONUP = ::RegisterWindowMessage(UWM_MOUSELBUTTONUP_MSG);
            UWM_MOUSELBUTTONDOWN = ::RegisterWindowMessage(UWM_MOUSELBUTTONDOWN_MSG);
            UWM_MOUSERBUTTONUP = ::RegisterWindowMessage(UWM_MOUSERBUTTONUP_MSG);
            UWM_MOUSERBUTTONDOWN = ::RegisterWindowMessage(UWM_MOUSERBUTTONDOWN_MSG);
            UWM_MOUSELDBCLICK   = ::RegisterWindowMessage(UWM_MOUSELDBCLICK_MSG);
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}

// Win32 Application main.cpp

#include "stdafx.h"
#include "stdafx.h"
#include <sstream>
#include "strsafe.h"
#include "../Hook/Hook.h"


#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;                                // current instance
TCHAR szTitle[MAX_LOADSTRING];                  // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name

// Forward declarations of functions included in this code module:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);



//Mouse Events
static  UINT UWM_MOUSEDBCLICK = ::RegisterWindowMessage( UWM_MOUSELDBCLICK_MSG );
static UINT UWM_MOUSELBUTTONUP = ::RegisterWindowMessage(UWM_MOUSELBUTTONUP_MSG);;
static UINT UWM_MOUSELBUTTONDOWN = ::RegisterWindowMessage(UWM_MOUSELBUTTONDOWN_MSG);
static UINT UWM_MOUSERBUTTONUP = ::RegisterWindowMessage(UWM_MOUSERBUTTONUP_MSG);
static UINT UWM_MOUSERBUTTONDOWN = ::RegisterWindowMessage(UWM_MOUSERBUTTONDOWN_MSG);
static UINT UWM_MOUSEMOVE = ::RegisterWindowMessage(UWM_MOUSEMOVE_MSG);
//
int APIENTRY _tWinMain(_In_ HINSTANCE hInstance,
                     _In_opt_ HINSTANCE hPrevInstance,
                     _In_ LPTSTR    lpCmdLine,
                     _In_ int       nCmdShow)
{
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);

    // TODO: Place code here.
    MSG msg;
    HACCEL hAccelTable;

    // Initialize global strings
    LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadString(hInstance, IDC_ACTIONX, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);

    // Perform application initialization:
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_ACTIONX));

    // Main message loop:
    while (GetMessage(&msg, NULL, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }

    }

    return (int) msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style          = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ACTIONX));
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName   = MAKEINTRESOURCE(IDC_ACTIONX);
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

    return RegisterClassEx(&wcex);
}

//
//   FUNCTION: InitInstance(HINSTANCE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance; // Store instance handle in our global variable

   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd); 


 BOOL result=InstallHook(hWnd);

   return TRUE;
}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND  - process the application menu
//  WM_PAINT    - Paint the main window
//  WM_DESTROY  - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;
//Global Mouse Move Handle
    if(message==UWM_MOUSEMOVE){
    MessageBox(
        NULL,
        (LPCWSTR)L"Resource not available\nDo you want to try again?",
        (LPCWSTR)L"Account Details",
        MB_ICONWARNING | MB_CANCELTRYCONTINUE | MB_DEFBUTTON2
    );
    return 0;
    }
    switch (message)
    {

    case WM_COMMAND:
        wmId    = LOWORD(wParam);
        wmEvent = HIWORD(wParam);
        // Parse the menu selections:
        switch (wmId)
        {
        case IDM_ABOUT:
            DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
            break;
        case IDM_EXIT:
            DestroyWindow(hWnd);
            break;
                case IDM_PLAY:
                    PlayMouse();
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
        }
        break;
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        // TODO: Add any drawing code here...
        EndPaint(hWnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    UNREFERENCED_PARAMETER(lParam);
    switch (message)
    {
    case WM_INITDIALOG:
        return (INT_PTR)TRUE;

    case WM_COMMAND:
        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
        {
            EndDialog(hDlg, LOWORD(wParam));
            return (INT_PTR)TRUE;
        }
        break;
    }
    return (INT_PTR)FALSE;
}

Answer 1

使用WH_MOUSE挂钩仅挂钩鼠标消息。

很少有建议：

确保已成功挂钩（SetWindowsHookEx返回非NULL值）
确保传递给挂钩程序的消息（将断点设置为这些点或使用跟踪功能）
您需要将目标窗口的HWND发送到每个进程或发送广播消息
对于Windows Vista以及具有较低权限的后续进程，无法使用更高权限发送消息。您需要使用ChangeWindowMessageFilter向过滤器添加必要的消息
使用PostMesssage代替SendMessage，无论如何都不需要阻止调用

Answer 2

在定义挂钩时，您必须为要拦截信号的窗口提供句柄。也许传递桌面的句柄甚至可以在客户端窗口之外捕获所有鼠标事件。

鼠标点击句柄

2 个答案: