WinApi - change Window Style

Question

I want to change my windo style during runtime. I use this code

if (this->fullscreen)
{
    this->style = WS_POPUP|WS_VISIBLE;
}
else 
{
    this->style = WS_OVERLAPPED|WS_SYSMENU|WS_VISIBLE;
}

    SetWindowLongPtr(this->mainWindowHandle, GWL_STYLE, this->style);

        SetWindowPos(this->mainWindowHandle, 
                HWND_TOP, 
                0, 
                0,
                0,    //New Width
                0, //New Height, 
            SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED);

But it has no effect... and window is still without border (WS_POPUP)...

check out solved answer here [Change Win32 Window Style solved](https://stackoverflow.com/a/49886801/6219626) — Haseeb Mir, Apr 18 '18 at 13:50

score 2 · Answer 1 · answered Feb 11 '11 at 18:00

2

According to MSDN, you can't modify those particular styles after the window is created. If you're going to try to anyway, it also says that WS_SYSMENU requires WS_CAPTION.

answered Feb 11 '11 at 18:00

Jon

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+1. You'll probably need separate windows for full-screen and windowed modes and switch between them as needed (by enabling the right window and making it visible and doing the reverse to the other). – Adrian McCarthy Feb 11 '11 at 18:21

score 1 · Answer 2 · answered Feb 11 '11 at 11:03

1

Try calling SetWindowPos with the flag SWP_DRAWFRAME and see if it helps.

answered Feb 11 '11 at 11:03

Please treat your mods well.

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No help.. SWP_DRAWFRAME is define for SWP_FRAMECHANGED (or the othew way) – Perry Feb 11 '11 at 11:25

score 0 · Answer 3 · answered Feb 11 '11 at 11:07

0

You might need to use CWnd::ModifyStyle. Have a look at example here

answered Feb 11 '11 at 11:07

Bojan Komazec

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score 0 · Answer 4 · answered Apr 18 '18 at 06:57

0

You might save the current pos and size from the actual window. Then destroy it an create an new window with the new style, previous pos and size.

answered Apr 18 '18 at 06:57

Tom Tom

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You don't need to destroy and re-create to do this. – Anders Apr 18 '18 at 17:28
some window stile can not be changed at runtime, so the this step is need!. – Tom Tom Oct 02 '20 at 00:00

WinApi - change Window Style

4 Answers4