c++钩子函数
c++系统钩子应用实现步骤
最近在学习c++钩子函数,在学习过程中得到了许多好友的帮助.特别是bdmh,daniel在此万分感谢.
深深感到在学习c++的路上,知己很多,我不是一个人在战斗.
结合自定义消息映射方面,作为学习的一个总结.
Step1:创建win32动态链接库(an empty project DLL),命名为HookDLL
1:增加一个类,命名为DLL.cpp
2:增加头文件
#include
#include "DLL.h"
3:创建全局变量
#pragma data_seg("Shared")
HHOOK mHook=NULL;
HINSTANCE hInstance=NULL;
#pragma data_seg()
4:在DLL.cpp中增加实现几个函数
a.钩子回调函数 LRESULT WINAPI KeyProc(int code,WPARAM wParam,LPARAM lParam)
b. 入口函数
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved)
c. 供外界调用的启动与停止钩子函数
extern "C" __declspec(dllexport) BOOL WINAPI Start()
extern "C" __declspec(dllexport) void WINAPI Stop()
d.自定义消息:#define WM_Hook WM_USER+100
具体代码如下:
LRESULT WINAPI KeyProc(int code,WPARAM wParam,LPARAM lParam)
{
if(code==HC_ACTION && (lParam & 0xc000ffff) ==1)
{
char *sName;
BOOL b_sft=::GetAsyncKeyState (VK_SHIFT)>>((sizeof(short)*8)-1);
if(b_sft)
{
switch(wParam)
{
case '1':sName="!"; break;
case '2':sName="@"; break;
case '3':sName = "#";break;
case '4':sName = "$";break;
case '5':sName = "%";break;
case '6':sName = "^";break;
case '7':sName = "&";break;
case '8':sName = "*";break;
case '9':sName = "(";break;
case '0':sName = ")";break;
case 'A':sName = "A";break;
case 'B':sName = "B";break;
case 'C':sName = "C";break;
case 'D':sName = "D";break;
case 'E':sName = "E";break;
case 'F':sName = "F";break;
case 'G':sName = "G";break;
case 'H':sName = "H";break;
case 'I':sName = "I";break;
case 'J':sName = "J";break;
case 'K':sName = "K";break;
case 'L':sName = "L";break;
case 'M':sName = "M";break;
case 'N':sName = "N";break;
case 'O':sName = "O";break;
case 'P':sName = "P";break;
case 'Q':sName = "Q";break;
case 'R':sName = "R";break;
case 'S':sName = "S";break;
case 'T':sName = "T";break;
case 'U':sName = "U";break;
case 'V':sName = "V";break;
case 'W':sName = "W";break;
case 'X':sName = "X";break;
case 'Y':sName = "Y";break;
case 'Z':sName = "Z";break;
}
}
else
{
switch(wParam)
{
/*0~9*/
case '1': sName="1"; break;
case '2':sName = "2";break;
case '3':sName = "3";break;
case '4':sName = "4";break;
case '5':sName = "5";break;
case '6':sName = "6";break;
case '7':sName = "7";break;
case '8':sName = "8";break;
case '9':sName = "9";break;
case '0':sName = "0";break;
/*A~Z*/
case 'A':sName = "a";break;
case 'B':sName = "b";break;
case 'C':sName = "c";break;
case 'D':sName = "d";break;
case 'E':sName = "e";break;
case 'F':sName = "f";break;
case 'G':sName = "g";break;
case 'H':sName = "h";break;
case 'I':sName = "i";break;
case 'J':sName = "j";break;
case 'K':sName = "k";break;
case 'L':sName = "l";break;
case 'M':sName = "m";break;
case 'N':sName = "n";break;
case 'O':sName = "o";break;
case 'P':sName = "p";break;
case 'Q':sName = "q";break;
case 'R':sName = "r";break;
case 'S':sName = "s";break;
case 'T':sName = "t";break;
case 'U':sName = "u";break;
case 'V':sName = "v";break;
case 'W':sName = "w";break;
case 'X':sName = "x";break;
case 'Y':sName = "y";break;
case 'Z':sName = "z";break;
}
}
switch(wParam) //数字键
{
case VK_BACK:sName="~"; break;
case VK_NUMPAD1:sName="1";break;
case VK_NUMPAD3:sName = "3";break;
case VK_NUMPAD4:sName = "4";break;
case VK_NUMPAD5:sName = "5";break;
case VK_NUMPAD6:sName = "6";break;
case VK_NUMPAD7:sName = "7";break;
case VK_NUMPAD8:sName = "8";break;
case VK_NUMPAD9:sName = "9";break;
case VK_NUMPAD0:sName = "0";break;
case VK_MULTIPLY:sName = "*";break;
case VK_ADD:
sName="+";
break;
case VK_SUBTRACT:
sName="-";
break;
case VK_DECIMAL:
sName=".";
break;
case VK_DIVIDE:
sName="/";
break;
}
HWND H_wnd=::GetForegroundWindow ();
//自定义消息发送
::SendMessage (H_wnd,WM_Hook,wParam, (LPARAM)(LPCSTR)sName);
MessageBox(H_wnd,sName,"键盘提示",MB_OK);
}
return CallNextHookEx( mHook, code, wParam, lParam );
}
BOOL APIENTRY DllMain(HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved)
{
switch(ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
hInstance=(HINSTANCE)hModule;
break;
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
extern "C" __declspec(dllexport) BOOL WINAPI Start()
{
if(mHook!=NULL) return FALSE;
//WH_KEYBOARD值为2,键盘消息钩子
//KeyProc 为回调函数
//hInstance:实例
//0:表示全局钩子
mHook=::SetWindowsHookEx (WH_KEYBOARD,KeyProc,hInstance,0);
return mHook!=NULL;
}
extern "C" __declspec(dllexport) void WINAPI Stop()
{
//要卸载的钩子
::UnhookWindowsHookEx (mHook);
}
5.在DLL.h中加入如下函数定义
extern "C" __declspec(dllexport) BOOL WINAPI Start();
extern "C" __declspec(dllexport) void WINAPI Stop();
编译生成HookDll.dll和HookDll.lib
Step 2:
1.新建MFC基本对话框应用程序,命名为HookTest,在其工作目录加入HookDll.dll和HookDll.lib
2.在CHookTestDlg.cpp中加入如下引用
//加入动态链接库的引用
#include "DLL.h"
//隐式调用库文件
#pragma comment(lib,"HookDLL")
3.加入自定义消息
#define WM_Hook WM_USER+100
4.加入消息映射
BEGIN_MESSAGE_MAP(CHookTestDlg, CDialog)
ON_MESSAGE(WM_Hook,OnReceive) //增加部分
END_MESSAGE_MAP()
5.在CHookTestDlg.h中加入消息声明
afx_msg void OnReceive(WPARAM wParam,LPARAM lParam);
6.在对话框另加入两个按钮btnStart,btnStop,相应的代码为:
void CHookTestDlg::OnbtnStartHook()
{
// TODO: Add your control notification handler code here
Start();
}
void CHookTestDlg::OnbtnStopHook()
{
// TODO: Add your control notification handler code here
Stop();
}
7.增加映射函数OnReceive的实现代码
void CHookTestDlg::OnReceive (WPARAM wParam,LPARAM lParam)
{
CEdit * mEdit=(CEdit *)GetDlgItem(IDC_EDIT1);
mEdit->SetWindowText ((LPCSTR)lParam);
}
Step 3:
运行程序,点btnStart,按键盘上任意键如A,,将弹出一对话框,并且文本显示回传的A
源代码URL:
http://download.csdn.net/source/3035667