SetWindowPlacement fails with ERROR_INVALID_PARAMETER

[rmcardle]

Describe the bug and how to reproduce

Tested on Windows 10 Pro 21H2 x64 using Vanara 3.4.14 from NuGet.

Vanara's WINDOWPLACEMENT structure includes the rcDevice field which is only defined in WinUser.h on Mac platforms, causing the size of the structure to be incorrect and SetWindowPlacement to fail.

From WinUser.h:

typedef struct tagWINDOWPLACEMENT {
    UINT  length;
    UINT  flags;
    UINT  showCmd;
    POINT ptMinPosition;
    POINT ptMaxPosition;
    RECT  rcNormalPosition;
#ifdef _MAC
    RECT  rcDevice;
#endif
} WINDOWPLACEMENT;

What code is involved

Initialize a Vanara.PInvoke.User32.WINDOWPLACEMENT structure with the length field set using (uint)Marshal.SizeOf(windowPlacement) (which returns 60) and use it in a call to Vanara.PInvoke.User32.SetWindowPlacement. The call returns false and GetLastError returns ERROR_INVALID_PARAMETER.

If you instead set length manually to 44 (the size of the WINDOWPLACEMENT structure without the rcDevice field), the call is successful and works as expected.

GetWindowPlacement returns a structure with the length set to 44.

Expected behavior

The call to SetWindowPlacement should succeed.