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Dynamically changing styles from CreateWindowEx

Started by JimPrice Oct 9, 2004 at 2:39 PM 4 replies 900+ views

Original Post

Oct 9, 2004 at 2:39 PM

Hi, When creating a window using CreateWindowEx you specify a dwExstyle and a dwstyle. I'd like to be able to change my dwstyle from WS_OVERLAPPEDWINDOW to WS_POPUP and back again on the fly - that is, a key stroke allows the program to change between the 2 styles once it is running. I'm fairly sure that SetWindowLong doesn't allow you to do this - it only allows changing a limited set of the style parameters. Does anyone know of anyway of doing (or appearing to do) this, or am I on a hiding to nothing? Regards, Jim.

Maega

Oct 9, 2004 at 2:51 PM

After using SetWindowLong, do you call SetWindowPos so the cached window data is refreshed?

JimPrice

Oct 9, 2004 at 3:01 PM

Yeah, I've tried this but it just seems to crash the program - the first example I tried was just adding an HSCROLL when you pressed the space button, but it seems to relegate the target window to be underneath everything else.

Thanks,
Jim.

JimPrice

Oct 9, 2004 at 3:05 PM

To clarify that last point, in my CALLBACK procedure I'm using:

case VK_SPACE:	 SetWindowLong(hwnd, GWL_STYLE,  dwStyle | WS_HSCROLL); SetWindowPos(   hwnd,    HWND_TOPMOST,   0,   0,   400,   300,   SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED);			return 0;[\source]

Aprosenf

Oct 9, 2004 at 4:38 PM

Use SetWindowLongPtr().

JimPrice

Oct 9, 2004 at 5:13 PM

I thought SetWindowLongPtr was just the same as SetWindowLong, except it is compatible with 32 and 64 bit systems - in which case it wouldn't address the issue. I'll have a go though.

Thanks,
Jim.

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