为何下面的代码只能实现在调用窗口取鼠标位置?

Question

// 程序调用部份代码
hMod = LoadLibrary("hookmessage.dll");

if(hMod)
{
STARTHOOK starthook = (STARTHOOK)GetProcAddress(hMod, _T("StartHook"));
if(starthook&&pWnd)
{
bool bok = (*starthook)(this->m_hWnd, pWnd->m_hWnd);
if(!bok)
{
MessageBox("启动失败!");
return;
}
}
else
{
MessageBox("未找到坐标获取模块.");
return;
}
}
else
{
MessageBox("未找到函数库. hookmessage.dll");
return;
}
// hookmessage.cpp : 定义 DLL 应用程序的入口点。
//#include "stdafx.h"
#include "stdio.h"HHOOK hk;
LRESULT CALLBACK CallWndProc(
  int nCode,     // hook code
  WPARAM wParam, // current-process flag
  LPARAM lParam  // message data
);
#define DLLEXPORT extern "C" __declspec(dllexport)DLLEXPORT bool StartHook(HWND hOwner, HWND hTarget);
DLLEXPORT void StopHook();HMODULE hMod;
HWND hWnd;
HWND hWndTarget;
BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
 )
{
hMod = (HMODULE)hModule;
    return TRUE;
}LRESULT CALLBACK CallWndProc(
  int nCode,     // hook code
  WPARAM wParam, // current-process flag
  LPARAM lParam  // message data
)
{
if(nCode<0)
{
return CallNextHookEx(hk, nCode, wParam, lParam);
}
else if(nCode>=0)
{
if(nCode==HC_ACTION)
{
PMOUSEHOOKSTRUCT hook_param;
hook_param = (PMOUSEHOOKSTRUCT)lParam; char cmsg[255];
sprintf(cmsg, "0x%X, X:%d,Y:%d", hook_param->hwnd, hook_param->pt.x, hook_param->pt.y); SetWindowText(hWnd, cmsg);
if(hook_param->hwnd == hWndTarget)
{

if(wParam == WM_MOUSEMOVE)
{
SendMessage(hWnd, WM_USER + 3 , MAKEWPARAM(hook_param->pt.x,hook_param->pt.y), 0);
}
} }
return CallNextHookEx(hk, nCode, wParam, lParam);
}
return 1;
}bool StartHook(HWND hOwner, HWND hTarget)
{
hWnd = hOwner;
hWndTarget = hTarget;
bool bOk = (hWnd&&hWndTarget); if(bOk)
{
hk = SetWindowsHookEx(WH_MOUSE, CallWndProc, hMod, 0);
}
bOk = bOk && hk;
return bOk;
}void StopHook()
{
UnhookWindowsHookEx(hk);
}

Answer 1

要将hHook保存至共享数据段// hookmessage.cpp : 定义 DLL 应用程序的入口点。
//#include "stdafx.h"
#include "stdio.h"#pragma data_seg("Shared")
HHOOK hk = NULL; // Hook handle for systemwide shell hook
HINSTANCE g_hInst = NULL;
#pragma data_seg()
#pragma comment(linker,"/SECTION:Shared,RWS")
LRESULT CALLBACK CallWndProc(
  int nCode,     // hook code
  WPARAM wParam, // current-process flag
  LPARAM lParam  // message data
);
#define DLLEXPORT extern "C" __declspec(dllexport)DLLEXPORT bool StartHook(HWND hOwner, HWND hTarget);
DLLEXPORT void StopHook();HMODULE hMod;
HWND hWnd;
HWND hWndTarget;
BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
 )
{
g_hInst = (HINSTANCE)hModule;
    return TRUE;
}LRESULT CALLBACK CallWndProc(
  int nCode,     // hook code
  WPARAM wParam, // current-process flag
  LPARAM lParam  // message data
)
{
if(nCode<0)
{
return CallNextHookEx(hk, nCode, wParam, lParam);
}
else if(nCode>=0)
{
if(nCode==HC_ACTION)
{
PMOUSEHOOKSTRUCT hook_param;
hook_param = (PMOUSEHOOKSTRUCT)lParam; char cmsg[255];
sprintf(cmsg, "0x%X, X:%d,Y:%d", hook_param->hwnd, hook_param->pt.x, hook_param->pt.y); SetWindowText(hWnd, cmsg);
if(hook_param->hwnd == hWndTarget)
{

if(wParam == WM_MOUSEMOVE)
{
SendMessage(hWnd, WM_USER + 3 , MAKEWPARAM(hook_param->pt.x,hook_param->pt.y), 0);
}
} }
return CallNextHookEx(hk, nCode, wParam, lParam);
}
return 1;
}bool StartHook(HWND hOwner, HWND hTarget)
{
hWnd = hOwner;
hWndTarget = hTarget;
bool bOk = (hWnd&&hWndTarget); if(bOk)
{
hk = SetWindowsHookEx(WH_MOUSE, CallWndProc, g_hInst , 0);
}
bOk = bOk && hk;
return bOk;
}void StopHook()
{
UnhookWindowsHookEx(hk);
}

Answer 2

何必这么麻烦？其实不用HOOK也可以取得鼠标在屏幕的位置啊。

Answer 3

// myhook.cpp : Defines the initialization routines for the DLL.
//#include "stdafx.h"
#include <afxdllx.h>
//#include <windows.h>
//#include <windowsx.h>
#include "myhook.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif#ifndef HOOKLIBAPI
#define HOOKLIBAPI  __declspec(dllimport)
#endif#pragma data_seg("mydata")
HWND glhPrevTarWnd=NULL;//上次鼠标所指的窗口句柄
HWND glhDisplayWnd=NULL;//显示目标窗口标题编辑框的句柄
HHOOK glhHook=NULL;//安装的鼠标勾子句柄
HINSTANCE glhInstance=NULL;//DLL实例句柄
#pragma data_seg()
#pragma comment(linker,"/SECTION:mydata,RWS")static AFX_EXTENSION_MODULE MyhookDLL = { NULL, NULL };extern "C" __declspec(dllexport) BOOL starthook(HWND hWnd);
extern "C" __declspec(dllexport) BOOL stophook();LRESULT WINAPI MouseProc(int nCode,WPARAM wparam,LPARAM lparam)
{
   LPMOUSEHOOKSTRUCT pMouseHook=(MOUSEHOOKSTRUCT FAR *) lparam;
   if (nCode>=0)
   {
      //取目标窗口句柄
      HWND glhTargetWnd=pMouseHook->hwnd;
 
      //char szClassName[38]="\0";
  //::GetClassName(glhTargetWnd, szClassName, 36);
  CString s;
  s.Format("X:%d  Y:%d",pMouseHook->pt.x,pMouseHook->pt.y);
      SendMessage(glhDisplayWnd,WM_SETTEXT,0,(LPARAM)(LPCTSTR)s);
   }
     return CallNextHookEx(glhHook,nCode,wparam,lparam);
      //继续传递消息
}extern "C" int APIENTRY
DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
// Remove this if you use lpReserved
UNREFERENCED_PARAMETER(lpReserved); if (dwReason == DLL_PROCESS_ATTACH)
{
TRACE0("MYHOOK.DLL Initializing!\n");

// Extension DLL one-time initialization
if (!AfxInitExtensionModule(MyhookDLL, hInstance))
return 0; new CDynLinkLibrary(MyhookDLL);//把DLL加入动态MFC类库中
        glhInstance=hInstance;//插入保存DLL实例句柄
}
else if (dwReason == DLL_PROCESS_DETACH)
{
TRACE0("MYHOOK.DLL Terminating!\n");
// Terminate the library before destructors are called
AfxTermExtensionModule(MyhookDLL);
}
return 1;   // ok
}BOOL starthook(HWND hWnd)
{
    //安装钩子并设定接收显示窗口句柄
BOOL bResult=FALSE;
    glhHook=SetWindowsHookEx(WH_MOUSE,MouseProc,glhInstance,0);
    if(glhHook!=NULL)
bResult=TRUE;
glhDisplayWnd=hWnd;
    //设置显示目标窗口标题编辑框的句柄
return bResult;
}BOOL stophook()
{
   //卸载钩子
   BOOL bResult=FALSE;
   if(glhHook)
   {
    bResult= UnhookWindowsHookEx(glhHook);
    if(bResult)
{
       glhPrevTarWnd=NULL;
       glhDisplayWnd=NULL;//清变量
       glhHook=NULL;
}
   }
   return bResult;
}
调用程序：//隐式加载dll
BOOL CMouseDlg::OnInitDialog()
{
CDialog::OnInitDialog(); // Add "About..." menu item to system menu. // IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000); CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
} // Set the icon for this dialog.  The framework does this automatically
//  when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon

// TODO: Add extra initialization here
CWnd * pwnd=GetDlgItem(IDC_EDIT1);
  starthook(pwnd->GetSafeHwnd());//加载钩子 return TRUE;  // return TRUE  unless you set the focus to a control
}

Answer 4

响应WM_MOUSEMOVE消息，生成消息响应函数
void CMy1Dlg::OnMouseMove(UINT nFlags, CPoint point) point.x point.y就是鼠标的客户区坐标位置

Answer 5

To Papaya:
编译没有通过,在链接时出了问题

Answer 6

我帮你解决获得坐标的问题，很简单。程序启动后添加一个SetTimer(1,70,0);然后在OnTimer()函数里处理          if (1 == nIDEvent)
{
CString CurPnt;
POINT spoint;
::GetCursorPos(&spoint); CurPnt.Format("X:%d Y:%d",spoint.x,spoint.y); // 这里就得到了。
GetDlgItem(IDC_STATIC)->SetWindowText(CurPnt);
}