SendMessage()函数发送的消息并不进入消息对列等待GetMessage()函数取出，而是直接传给窗口函数。
示例：
LRESULT CALLBACK MouseProc(
int nCode, // hook code
WPARAM wParam, // message identifier
LPARAM lParam // mouse coordinates
)
{
return 1; //钩子函数返回非零值，系统不再把消息送到相应应用程序
}
HHOOK g_hKeyboard=NULL;
LRESULT CALLBACK KeyboardProc(
int code, // hook code
WPARAM wParam, // virtual-key code
LPARAM lParam // keystroke-message information
)
{
if(VK_SPACE==wParam)//仅屏蔽掉空格键，可鼠标右击，用go to definition查看其他虚拟键
return 1;
//if(VK_F4==wParam&&(1==(lParam>>29&1)))
//return 1;
//屏蔽组合键Alt+F4，lParam第29位请查MSDN
else
return ::CallNextHookEx(g_hKeyboard,code,wParam,lParam);
}
BOOL CHookDemoDlg::OnInitDialog()
{
…….
::SetWindowsHookEx(WH_MOUSE,MouseProc,NULL,::GetCurrentThreadId());
g_hKeyboard=::SetWindowsHookEx(WH_KEYBOARD,KeyboardProc,NULL,::GetCurrentThreadId());
}
为自己程序留后门
编写这样的钩子函数：
LRESULT CALLBACK KeyboardProc(
int code, // hook code
WPARAM wParam, // virtual-key code
LPARAM lParam // keystroke-message information
)
{
// if(VK_SPACE==wParam)
/* if(VK_F4==wParam&&(1==(lParam>>29&1)))
return 1;
else
return ::CallNextHookEx(g_hKeyboard,code,wParam,lParam);*/
if(VK_F2==wParam)
{
::SendMessage(g_hWnd,WM_CLOSE,0,0);
UnhookWindowsHookEx(g_hKeyboard);
UnhookWindowsHookEx(g_hKeyboard);
}
return 1;
}
要让钩子过程与所有线程相关，必须把SetWindowsHookEx第四个参数设为0，第三个为钩子函数所在DLL。
安装关联到所有线程的钩子，将挂钩函数写入DLL中，
记得声明它为导出函数，在.def文件中.
.dll中
#include<windows.h>
HHOOK g_hMouse;
HHOOK g_hKeyboard=NULL;
HWND g_hWnd;
/*HINSTANCE g_hInst;
BOOL WINAPI DllMain(
HINSTANCE hinstDLL, // handle to the DLL module
DWORD fdwReason, // reason for calling function
LPVOID lpvReserved // reserved
)
{
g_hInst=hinstDll;
}
*/
LRESULT CALLBACK MouseProc(
int nCode, // hook code
WPARAM wParam, // message identifier
LPARAM lParam // mouse coordinates
)
{
return 1;
}
LRESULT CALLBACK KeyboardProc(
int code, // hook code
WPARAM wParam, // virtual-key code
LPARAM lParam // keystroke-message information
)
{
if(VK_F2==wParam)
{
::SendMessage(g_hWnd,WM_CLOSE,0,0);
UnhookWindowsHookEx(g_hMouse);
::UnhookWindowsHookEx(g_hKeyboard);
}
return 1;
}
void SetHook(HWND hwnd)
{
g_hWnd=hwnd;
g_hKeyboard=::SetWindowsHookEx(WH_KEYBOARD,KeyboardProc,GetModuleHandle("HOOk"),0);
g_hMouse=::SetWindowsHookEx(WH_MOUSE,MouseProc,::GetModuleHandle("HOOK"),0);
//::SetWindowsHookEx(WH_MOUSE,MouseProc,g_hInst,0);
}
.def中
LIBRARY HOOK //此句可无
EXPORTS
SetHook
目的模块中，如先声明其为外部导入的函数
_declspec(dllimport)void SetHook(HWND hwnd);
BOOL CHookTestDlg::OnInitDialog()
{
…………..
int cxScreen,cyScreen;//全屏幕当前窗口，而且在最顶层。
cxScreen=::GetSystemMetrics(SM_CXSCREEN);
cyScreen=::GetSystemMetrics(SM_CYSCREEN);
SetWindowPos(&wndTopMost,0,0,cxScreen,cyScreen,SWP_SHOWWINDOW);
SetHook(m_hWnd);
}
查看动态链接库的节
dumpbin -headers xxx.dll
动态连接库里的全局变量数据共享问题
方法一.cpp中
#pragma data_seg("MySec")
HWND g_hWnd=NULL;
#pragma data_seg() //定义一个节
#pragma comment(linker,"/section:Mysec,RWS")//设置连接选项
方法二.cpp中
#pragma data_seg("MySec")
HWND g_hWnd=NULL;
#pragma data_seg() //定义一个节
.def中
SEGMENTS
MySec READ WRITE SHARED
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