编写安全的C++鼠标钩子程序

创建一个安全的C++鼠标钩子程序需要使用低级别的API函数

#include <iostream>
#include <windows.h>

// 定义一个全局变量来存储鼠标钩子的句柄
HHOOK g_hMouseHook = NULL;

// 鼠标钩子回调函数
LRESULT CALLBACK MouseHookProc(int nCode, WPARAM wParam, LPARAM lParam) {
    if (nCode >= 0) {
        switch (wParam) {
            case WM_MOUSEMOVE:
                std::cout << "Mouse moved to (" << LOWORD(lParam) << ", " << HIWORD(lParam) << ")" << std::endl;
                break;
            case WM_LBUTTONDOWN:
                std::cout << "Left button clicked at (" << LOWORD(lParam) << ", " << HIWORD(lParam) << ")" << std::endl;
                break;
            case WM_RBUTTONDOWN:
                std::cout << "Right button clicked at (" << LOWORD(lParam) << ", " << HIWORD(lParam) << ")" << std::endl;
                break;
            case WM_MBUTTONDOWN:
                std::cout << "Middle button clicked at (" << LOWORD(lParam) << ", " << HIWORD(lParam) << ")" << std::endl;
                break;
        }
    }

    // 调用默认的鼠标钩子处理程序
    return CallNextHookEx(g_hMouseHook, nCode, wParam, lParam);
}

// 安装鼠标钩子
BOOL InstallMouseHook() {
    g_hMouseHook = SetWindowsHookEx(WH_MOUSE_LL, MouseHookProc, GetModuleHandle(NULL), 0);
    if (g_hMouseHook == NULL) {
        std::cerr << "Failed to install mouse hook. Error code: " << GetLastError() << std::endl;
        return FALSE;
    }
    std::cout << "Mouse hook installed successfully." << std::endl;
    return TRUE;
}

// 卸载鼠标钩子
void UninstallMouseHook() {
    if (g_hMouseHook != NULL) {
        UnhookWindowsHookEx(g_hMouseHook);
        g_hMouseHook = NULL;
        std::cout << "Mouse hook uninstalled successfully." << std::endl;
    } else {
        std::cerr << "Mouse hook is not installed." << std::endl;
    }
}

int main() {
    if (InstallMouseHook()) {
        std::cout << "Press any key to uninstall mouse hook and exit..." << std::endl;
        std::cin.get();
        UninstallMouseHook();
    }
    return 0;
}

这个程序使用SetWindowsHookEx函数安装一个低级鼠标钩子，当鼠标移动或点击时，回调函数MouseHookProc会被调用。在这个函数中，我们处理了鼠标移动、左键点击、右键点击和中键点击事件，并将它们的位置输出到控制台。

请注意，这个程序需要在Windows操作系统上运行，并且需要包含windows.h头文件。此外，这个程序仅适用于C++编译器，并且需要在Visual Studio或其他支持C++的IDE中编译和运行。