一个获取用户按键的并显示的钩子小程序

//////////////////////////////////////////////// // KeyHookLib.cpp文件 #include <windows.h> #define KEYHOOKLIB_EXPORTS #include "KeyHookLib.h" // 共享数据段 #pragma data_seg("YCIShared") HWND g_hWndCaller = NULL; // 保存主窗口句柄 HHOOK g_hHook = NULL; // 保存钩子句柄 #pragma data_seg() // 一个通过内存地址取得模块句柄的帮助函数 HMODULE WINAPI ModuleFromAddress(PVOID pv) { MEMORY_BASIC_INFORMATION mbi; if(::VirtualQuery(pv, &mbi, sizeof(mbi)) != 0) { return (HMODULE)mbi.AllocationBase; } else { return NULL; } } // 键盘钩子函数 LRESULT CALLBACK KeyHookProc(int nCode, WPARAM wParam, LPARAM lParam) { if(nCode < 0 || nCode == HC_NOREMOVE) return ::CallNextHookEx(g_hHook, nCode, wParam, lParam); if(lParam & 0x40000000) // 消息重复就交给下一个hook链 { return ::CallNextHookEx(g_hHook, nCode, wParam, lParam); } // 通知主窗口。wParam参数为虚拟键码, lParam参数包含了此键的信息 ::PostMessage(g_hWndCaller, HM_KEY, wParam, lParam); return ::CallNextHookEx(g_hHook, nCode, wParam, lParam); } // 安装、卸载钩子的函数 BOOL WINAPI SetKeyHook(BOOL bInstall, DWORD dwThreadId, HWND hWndCaller) { BOOL bOk; g_hWndCaller = hWndCaller; if(bInstall) { g_hHook = ::SetWindowsHookEx(WH_KEYBOARD, KeyHookProc, ModuleFromAddress(KeyHookProc), dwThreadId); bOk = (g_hHook != NULL); } else { bOk = ::UnhookWindowsHookEx(g_hHook); g_hHook = NULL; } return bOk; }