Dynamically changing styles from CreateWindowEx

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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.

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

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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.

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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]

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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.