C# Signature:

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("user32.dll", SetLastError = true)]
static extern bool PostMessage(HandleRef hWnd, uint Msg, IntPtr wParam,
   IntPtr lParam);

vb Signature:

<DllImport("user32.dll", SetLastError:=True, CharSet:=CharSet.Auto)> _
Private Shared Function PostMessage( _
     ByVal hWnd As IntPtr, _
     ByVal Msg As UInteger, _
     ByVal wParam As IntPtr, _
     ByVal lParam As IntPtr) As Boolean
End Function

User-Defined Types:

None.

Notes:

MSDN says: If the function fails, the return value is zero. To get extended error information, call GetLastError.

Tips & Tricks:

Please add some!

Sample Code:

A wrapper for PostMessage looking for errors:

    int PostMessageSafe( HandleRef hWnd, uint msg, IntPtr wParam, IntPtr lParam )
    {
        bool returnValue = PostMessage( hWnd, msg, wParam, lParam );

        if( returnValue == false )
        {
        // An error occured
        throw new Win32Exception( Marshal.GetLastWin32Error() );
        }

        return returnValue;
    }        

Alternative Managed API:

Do you know one? Please contribute it!

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).