Hook技術１：線程鉤子

// ChildView.cpp : implementation of the CChildView class
//

#include "stdafx.h"
#include "MouseHook.h"
#include "ChildView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
HHOOK hHook;
CPoint point;
CChildView *pView;
char gstr[256]="123456";
LRESULT CALLBACK MouseProc(int nCode,WPARAM wParam,LPARAM lParam)
{
 //鼠標移動消息
 if(wParam==WM_MOUSEMOVE||wParam==WM_NCMOUSEMOVE)
 {
  point = ((MOUSEHOOKSTRUCT *)lParam)->pt;
  pView ->Invalidate();
 }
 if(wParam==WM_LBUTTONDOWN)
 {
  sprintf(gstr,"fuck"); 
 }
 return CallNextHookEx(hHook,nCode,wParam,lParam);
}
/////////////////////////////////////////////////////////////////////////////
// CChildView

CChildView::CChildView()
{
 pView = this;
 hHook = SetWindowsHookEx(WH_MOUSE,MouseProc,0,GetCurrentThreadId());
 
}

CChildView::~CChildView()
{
 if(hHook)
  UnhookWindowsHookEx(hHook);
}

BEGIN_MESSAGE_MAP(CChildView,CWnd )
 //{{AFX_MSG_MAP(CChildView)
 ON_WM_PAINT()
 //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CChildView message handlers

BOOL CChildView::PreCreateWindow(CREATESTRUCT& cs)
{
 if (!CWnd::PreCreateWindow(cs))
  return FALSE;

 cs.dwExStyle |= WS_EX_CLIENTEDGE;
 cs.style &= ~WS_BORDER;
 cs.lpszClass = AfxRegisterWndClass(CS_HREDRAW|CS_VREDRAW|CS_DBLCLKS,
  ::LoadCursor(NULL, IDC_ARROW), HBRUSH(COLOR_WINDOW+1), NULL);

 return TRUE;
}

void CChildView::OnPaint()
{
 CPaintDC dc(this); // device context for painting
 char str[256];
 sprintf(str,"x=%d,y=%d",point.x,point.y);
 dc.TextOut(0,0,str);
 dc.TextOut(50,50,gstr);
 // TODO: Add your message handler code here
 
 // Do not call CWnd::OnPaint() for painting messages
}

１。先寫自己的消息處理函數，如上面的MouseProc來處理自己感興趣的消息（WM_MOUSEMOVE，WM_NCMOUSEMOVE，WM_LBUTTONDOWN(我感興趣的是鼠標移動與單擊左鍵)）

注：最好在自己的函數的最後調用　CallNextHookEx() 以讓消息繼續向下傳遞。（當然如果是想屏蔽的就用了：））

２。通過SetWindowsHookEx()把自己的函數放到消息處理函數鏈表的隊首

HHOOK SetWindowsHookEx(
  int idHook,        // type of hook to install　Hook的類型，看入門篇
  HOOKPROC lpfn,     // address of hook procedure　處理函數指針，這裏即上面的MouseProc
  HINSTANCE hMod,    // handle to application instance　應用程序實例句柄，線程鉤子爲０
  DWORD dwThreadId   // identity of thread to install hook for　所要監視的純種ＩＤ
);

以上就完成了鉤子函數的編寫與投放，其已經開始工作

３。不用以後　記得釋放啊。。

用UnhookWindowsHookEx(HHOOK hHook); 其參數爲投放鉤子函數時 SetWindowsHookEx的返回句柄。