WINAPI serialize messages - c++

Question

I am creating a window with the following 2 aims both of which are requird:
when person clicks outside of the window, the window is destroyed.
when a person clicks a button inside the window, we process the WM_COMMAND message, and then the window is destroyed.
To achieve both these goals, I looked and found there is a WM_KILLFOCUS message which is sent when the window looses focus.
I wrote destroy window code in the WM_KILLFOCUS handler, but then the button click message box does not come. I searched and found the destroy event is not serialized and hence it could be that it is being sent before the window button click could be caught. I have hence changed the code like below, where it also sends a WM_COMMNAD to kill the window.
case WM_KILLFOCUS:
SendMessage(hwnd, WM_COMMAND, KILLTHEWIN, 0);// hope it serializes message
break;
case WM_COMMAND:
switch (wp)
{
case KILLTHEWIN:
DestroyWindow(hwnd);
break;
case BUTTON_CLICKED:
default:
MessageBox(NULL, L"Hurray", L"Hurray MSG reveid", MB_OK);
break;
}
I see that when I click the button inside the window, the window is destroyed and the MessageBox "Hurray" is not received.
How can I ensure that the messages are processed before destroying the window?
Update 1: Minimal code as asked. Now handling the WM_ACTIVATE message instead for handling WM_KILLFOCUS . Both the two aims are written above:
#include <windows.h>
#include <stdlib.h>
#include <iostream>
#include <string>
#include <windowsx.h>
#include <map>
#include <commctrl.h>
#define KILLTHEWIN 10
#define BUTTON_PRESS 11
LRESULT CALLBACK windowprocedure(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp);
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR args, int ncmdshow)
{
WNDCLASSW wc = { 0 };
wc.hbrBackground = (HBRUSH)COLOR_WINDOW;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hInstance = hInst;
wc.lpszClassName = L"mywindowsclass";
wc.lpfnWndProc = windowprocedure;
// before creating window for a class we need to register that class
if (!RegisterClassW(&wc))
{
return -1; // registration failed
}
HWND hWnd = CreateWindowW(L"mywindowsclass", L"My window", WS_POPUP | WS_VISIBLE/*| WS_EX_TOOLWINDOW*/ /* check for no task bar*/,
100, 100, 170, 500, NULL, NULL, NULL, NULL);
MSG msg{ 0 };
while (GetMessage(&msg, NULL, NULL, NULL))
{
// translate the messahe
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
// main window message handling
LRESULT CALLBACK windowprocedure(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)
{
DWORD dwStyleOfStaticText = 0;
HWND hBmp2 = NULL;
WORD reason = 0;
switch (msg)
{
case WM_CREATE:
dwStyleOfStaticText = SS_NOTIFY | SS_LEFT | WS_CHILD | WS_VISIBLE | WS_TABSTOP /*| WS_BORDER */;
hBmp2 = CreateWindowW(L"Button", L"Button1", WS_VISIBLE | WS_CHILD,
5, 5 + 4 * 15, 100, 50,
hwnd, (HMENU)BUTTON_PRESS, NULL, NULL);
SetWindowLong(hwnd, GWL_STYLE, 0);
break;
case WM_ACTIVATE:
reason = LOWORD(wp);
if (reason == WA_ACTIVE)
{
//Activated by some method other than a mouse click (for example, by a call to the SetActiveWindow function or by use of the keyboard interface to select the window).
}
else if (reason == WA_CLICKACTIVE)
{
// activated by mouse click
}
else if (reason == WA_INACTIVE)
{
PostMessage(hwnd, WM_COMMAND, KILLTHEWIN, 0);
}
break;
case WM_COMMAND: // when ever a menu is clicked
// WM_COMMAND has been received for which control handle and then kill it
switch (wp)
{
case KILLTHEWIN:
DestroyWindow(hwnd);
break;
case BUTTON_PRESS:
MessageBoxW(hwnd, L"button pressed", L"button pressed caption ", MB_OK);
break;
}
PostMessage(hwnd, WM_COMMAND, KILLTHEWIN, 0);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProcW(hwnd, msg, wp, lp);// case other as default window procedure
}
return (LRESULT)0;
}
The WM_ACTIVATE was handled above instead of the kill focus .
The two aims written above are really important . Still on pressing the button the MessageBox does not appear and window is killed .
I put it in debugger
one time the breakpoint hit the button message box but it still did not came . The other time the breakpoint hit the WM_ACTIVATE deactivate reason first .