CreateWindowEx posts WM_SIZE? - c++

Question

CreateWindowEx API really posts WM_SIZE message?
When I create a window via CreateWindowEx as full screen mode,
CreateWindowEx posts WM_SIZE but window mode doesn't.
My code sets the window style like this :
if(bFullscr)
{
//When the window is in full screen mode.
nStyle = WS_POPUP;
nExtraStyle = WS_EX_APPWINDOW;
}
else
{
//Otherwise.
nStyle = WS_OVERLAPPEDWINDOW;
nExtraStyle = (WS_EX_APPWINDOW | WS_EX_WINDOWEDGE);
}
And changes display settings like this (full screen mode only) :
if(bFullscr)
{
DEVMODE sScrSet;
memset(&sScrSet, 0, sizeof(DEVMODE));
sScrSet.dmSize = sizeof(DEVMODE);
sScrSet.dmPelsWidth = nWidth;
sScrSet.dmPelsHeight = nHeight;
sScrSet.dmBitsPerPel = nColorBit;
sScrSet.dmFields = (DM_BITSPERPEL | DM_PELSHEIGHT | DM_PELSWIDTH);
if(ChangeDisplaySettings(&sScrSet, CDS_FULLSCREEN) != DISP_CHANGE_SUCCESSFUL)
{
//Error routine.
}
}
I'm really wonder why CreateWindowEx posts WM_SIZE message selectively.

Answer 1

If you simply want to resize the window, somewhere in your code you should have ShowWindow(hWnd, nCmdShow); change it as follows:
ShowWindow(hWnd, SW_SHOWDEFAULT);//show normal
ShowWindow(hWnd, SW_SHOWMAXIMIZED);//show maximized (full screen)
SetWindowPos(hWnd, NULL, 10, 10, 300, 300, SWP_SHOWWINDOW);//show at specific position
Also you could use WS_MAXIMIZE in CreateWindow, but that could complicate things. Window usually has WS_OVERLAPPEDWINDOW or WS_POPUP|WS_CAPTION|WS_SYSMENU. You should pick one and keep it simple.
When Window size changes, it receives WM_SIZE, you can catch that and examine it.