asked on

Get hWnd of window from right-click.

Using a simple dialog-based app, I would like to get the window title of any running window if the window's title bar is right-clicked.

I beleive I can simply call WindowFromPoint() (as well as a few other API calls), but I need to know how to trap mouse events outside of the running CDialog-derived class. Basically, all system enevts, filtering mouse events.

job_s

U can use the
SetWindowsHookEx ,
CallNextHook
UnhookWindowsHookEx
functions for traping system events.

deadice

ASKER

Here's the DLL I'm using:

HEADER
#ifdef MOUSEMSG_EXPORTS
#define MOUSEMSG_API __declspec(dllexport)
#else
#define MOUSEMSG_API __declspec(dllimport)
#endif

LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam);
extern "C"
{
MOUSEMSG_API void SetHandle(HWND hWnd);
MOUSEMSG_API BOOL MouseHook( void );
MOUSEMSG_API BOOL MouseUnHook( void );
}

SOURCE
#include "stdafx.h"
#include "mousemsg.h"

#pragma comment(linker, "-section:.shared,rws")
#pragma data_seg(".shared")

HHOOK _hMouseHook = NULL;

#pragma data_seg()

HWND _hWnd = NULL;
HINSTANCE g_hInst = NULL;

BOOL APIENTRY DllMain( HINSTANCE hInstance,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH: g_hInst = hInstance; break;
case DLL_THREAD_DETACH: break;
case DLL_PROCESS_DETACH:break;
break;
}

return TRUE;
}

MOUSEMSG_API void SetHandle(HWND hWnd) { _hWnd = hWnd; }

MOUSEMSG_API BOOL MouseHook( void )
{
_hMouseHook = SetWindowsHookEx(WH_MOUSE, MouseProc, g_hInst, 0);
return (_hMouseHook != NULL);
}

MOUSEMSG_API BOOL MouseUnHook( void )
{
return UnhookWindowsHookEx(_hMouseHook);
}

LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam)
{
if (nCode < 0) // do not process the message
return CallNextHookEx(_hMouseHook, nCode, wParam, lParam);

if (wParam == WM_LBUTTONUP)
{
LPMOUSEHOOKSTRUCT hook = (LPMOUSEHOOKSTRUCT)lParam;
POINT point = hook->pt;
HWND hWnd = WindowFromPoint(point);
char chBuff[1024];
ZeroMemory(chBuff, 1024);

GetWindowText(hWnd, chBuff, 1024);
if (_hWnd != NULL) SendMessage(_hWnd, WM_USER + 1, NULL, (LPARAM)chBuff);
}

return CallNextHookEx(_hMouseHook, nCode, wParam, lParam);
}

This seems to hook only the dialogs events, not the entire system. Is there something missing?

deadice

ASKER

In my test app, i have (in CWinApp::InitInstance()):

typedef BOOL (*MOUSEHOOK) (VOID);
MOUSEHOOK MouseHook;

m_hMouseDll = LoadLibrary("mousemsg.dll");
MouseHook = (MOUSEHOOK)GetProcAddress(m_hMouseDll, "MouseHook");
SetHandle = (SETHANDLE)GetProcAddress(m_hMouseDll, "SetHandle");

MouseHook();

ASKER CERTIFIED SOLUTION

MGlobal

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jkr

You'll have to move the window handle declaration into the shared data seg:

pragma comment(linker, "-section:.shared,rws")
#pragma data_seg(".shared")

HHOOK _hMouseHook = NULL;
HWND _hWnd = NULL;

#pragma data_seg()

and it should work...