DLL项目的头文件

#ifdef KEYHOOKLIB_EXPORT //此宏将在CPP文件中定义
#define KEYHOOKLIB_API __declspec(dllexport)
#else
#define KEYHOOKLIB_API __declspec(dllimport)
#endif#define HM_KEY WM_USER+101BOOL KEYHOOKLIB_API WINAPI SetKeyHook(BOOL bInstall,DWORD dwThreadId = 0,HWND hWndCaller=NULL);

DLL项目CPP文件

#include <windows.h>
#define KEYHOOKLIB_EXPORT
#include "a.h"#pragma data_seg("MyShared")//用共享数据段来保存主窗口句柄和钩子句柄
HWND g_hWndCaller = NULL;
HHOOK g_hHook = NULL;
#pragma data_seg()//通过内存地址取得模块句柄
HMODULE WINAPI ModuleFromAddress(PVOID pv)
{MEMORY_BASIC_INFORMATION mbi;//此结构请查看MSDNif(::VirtualQuery(pv,&mbi,sizeof(mbi))){return (HMODULE)mbi.AllocationBase;}return NULL;
}//钩子的回调函数
LRESULT CALLBACK KeyHookProc(int nCode,//HOOK代码，钩子函数使用这个参数来确定任务WPARAM wParam,LPARAM lParam)
{if(nCode<0||nCode == HC_NOREMOVE)//没用的消息{return ::CallNextHookEx(g_hHook,nCode,wParam,lParam);}if(lParam&0x40000000)//消息重复{return ::CallNextHookEx(g_hHook,nCode,wParam,lParam);}::PostMessage(g_hWndCaller,WM_CLOSE,0,0);return ::CallNextHookEx(g_hHook,nCode,wParam,lParam);
}//给系统注册钩子
BOOL WINAPI SetKeyHook(BOOL bInstall,DWORD dwThreadId,HWND hWndCaller)
{BOOL bOK;g_hWndCaller = hWndCaller;if(bInstall){HMODULE temp = ModuleFromAddress(KeyHookProc);//钩子函数所在的DLL的实例句柄g_hHook = ::SetWindowsHookEx(WH_KEYBOARD,//键盘钩子标志KeyHookProc,//回调函数temp,dwThreadId//线程句柄);if(g_hHook!=NULL){bOK = TRUE;}else{bOK = FALSE; }}else{bOK = ::UnhookWindowsHookEx(g_hHook);//卸载钩子g_hHook = NULL;}return bOK;
}

DLL项目的DEF文件

LIBRARY    "gouzi"
EXPORTS
SetKeyHook
SECTIONS
MyShared Read Write Shared

注册钩子的工程

#include <windows.h>
#include <iostream>
#include "a1.h"//DLL中的头文件
using namespace std;
#pragma comment(lib,"gouzi")void main()
{::SetConsoleTitle("aaa");//HWND hWnd = ::FindWindow(NULL,"Our First Window");HWND hWnd = ::FindWindow("notepad",NULL);//::SendMessage(hWnd,HM_KEY,)if(!SetKeyHook(TRUE,0,hWnd)){cout<<"安装钩子失败"<<endl;return;}char a;while(true){cin>>a;if(a == 'u'){SetKeyHook(FALSE,0,hWnd);return;}}return;
}