When program close

[Hex213]

Hi, I want to know when closing the program can make any command before close ? Is there any function or something similar? Can you help me ?

[freddie1]

Can you help me ?

Not unless you tell us what technology you are using to create the program. Windows Forms? Win32 Api? MFC? wxWidgets? QT? Something else?

[Hex213]

I use win32.

[freddie1]

Well, when the user clicks the little [x] thingie in the title bar to close the program, Windows sends WM_CLOSE and WM_DESTROY messages to the Window Procedure for the class of window where the click occurred. All you need to do is write a function containing valid code you want executed when either of those messages are received. When the message comes in, call the function. Do you know how to do that?

[Hex213]

Please can you show me some example?

[freddie1]

#ifndef UNICODE
    #define UNICODE
#endif
#ifndef _UNIODE
    #define _UNICODE
#endif
#include <windows.h>


void DoCloseOutWork(HWND hWnd)
{
 MessageBox(hWnd,L"Doing App Clean Up Work!",L"Progress Report",MB_OK);
}


LRESULT CALLBACK WindowProcedure(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
 if(message==WM_CLOSE)
 {
    DoCloseOutWork(hWnd);
    PostQuitMessage(0);
 }

 return DefWindowProc(hWnd, message, wParam, lParam);
}


int WINAPI WinMain(HINSTANCE hIns, HINSTANCE hPrevIns, LPSTR lpszArgument, int iShow)
{
 const wchar_t szClassName[]=L"Form1";
 WNDCLASSEX wc;
 MSG messages;
 HWND hWnd;

 wc.lpszClassName=szClassName;                wc.lpfnWndProc=WindowProcedure;
 wc.cbSize=sizeof (WNDCLASSEX);               wc.style=0;
 wc.hIcon=LoadIcon(NULL,IDI_APPLICATION);     wc.hInstance=hIns;
 wc.hIconSm=LoadIcon(NULL, IDI_APPLICATION);  wc.hCursor=LoadCursor(NULL,IDC_ARROW);
 wc.hbrBackground=(HBRUSH)COLOR_BTNSHADOW;    wc.cbWndExtra=0;
 wc.lpszMenuName=NULL;                        wc.cbClsExtra=0;
 RegisterClassEx(&wc);
 hWnd=CreateWindowEx(0,szClassName,szClassName,WS_OVERLAPPEDWINDOW,75,75,320,305,HWND_DESKTOP,0,hIns,0);
 ShowWindow(hWnd,iShow);
 while(GetMessage(&messages,NULL,0,0))
 {
    TranslateMessage(&messages);
    DispatchMessage(&messages);
 }

 return messages.wParam;
}

[Hex213]

Thank you.

[freddie1]

I was trying to be as concise as possible, but the code I posted might be overly so. It seems to work, but here is a more technically correct Window Procedure...

LRESULT CALLBACK WindowProcedure(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
 switch(message)
 {
   case WM_CLOSE:
    {
        DoCloseOutWork(hWnd);
        DestroyWindow(hWnd);
        return 0;
    }
   case WM_DESTROY:
    {
        PostQuitMessage(0);
        return 0;
    }
 }

 return DefWindowProc(hWnd, message, wParam, lParam);
}

Do a search on WM_CLOSE

[andywestken]

Depending on what you want to do, you could just call your function from WinMain() after exiting the message loop.

Andy

PS Remember the +1 for the brush color

wc.hbrBackground = (HBRUSH)(COLOR_BTNSHADOW + 1);

(if you want COLOR_BTNSHADOW)