Issue with shappbarmessage for taskbar position on windows 10.I am trying to get the taskbar position but the code is throwing win32 error.

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In which scenario can SHAppBarMessage give win32 exception.

I am having issue with SHAppBarMessage, I am trying to get the TaskBar Position but the code is throwing win32 error.

C#

public static .APPBARDATA GetSHAppBarMessage() 
{ 
    var data = new APPBARDATA { hWnd = IntPtr.Zero }; 
    data.cbSize = Marshal.SizeOf(data); 

    var result = SHAppBarMessage(ABM_GETTASKBARPOS, ref data); 
    if (result == IntPtr.Zero) Win32.ThrowIfWin32Error(); 
    
    return data; 
}

What I have tried:

Tried the same app in different machine the issue is observed in some machine but not always.

Posted 14-Jul-21 20:30pm

kavyakalagiri

Updated 14-Jul-21 22:07pm

Richard Deeming

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Richard Deeming · Answer 1 · 2021-07-14T22:07:00

SHAppBarMessage function (shellapi.h) - Win32 apps | Microsoft Docs[^]:
This function returns a message-dependent value. For more information, see the Windows SDK documentation for the specific appbar message sent. Links to those documents are given in the See Also section.

ABM_GETTASKBARPOS message (Shellapi.h) - Win32 apps | Microsoft Docs[^]:
Returns TRUE if successful; otherwise, FALSE.

The documentation doesn't provide any useful information about why the call might fail.

According to this SO answer[^], an older version of the documentation said that you have to pass the hWnd of the Shell_TrayWnd window as well as the cbSize; maybe older versions of Windows required that?

But since you haven't told us what error you're getting, we can only guess at this point.