c++ - 鼠标点击 handle

Question

我正在尝试处理屏幕上的鼠标事件(在客户端窗口之外)。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，当鼠标在窗口外或窗口未激活时，什么也不会发生。

//钩子(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应用程序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 钩子(Hook)只钩住鼠标消息。

一些建议:

• 确保 Hook 安装成功(SetWindowsHookEx 返回非空值)
• 确保消息传递到钩子(Hook)程序(在这些点设置断点或使用跟踪功能)
• 您需要向每个进程发送目标窗口的 HWND 或发送广播消息
• 对于 Windows Vista 和更高版本的具有较低权限的进程不能将消息发送到具有较高权限的进程。您需要使用 ChangeWindowMessageFilter向过滤器添加必要的消息
• 使用 PostMesssage 而不是 SendMessage，无论如何你不需要在这里阻塞调用