pinvoke.net: Edit: kernel32.GetLastError

@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$
@pinvoke=http://pinvoke.net/$$$.htm

Summary: Retrieves the calling thread's last-error code value.

!!!!C# Signature:
 [DllImport("kernel32.dll")]
 static extern uint GetLastError();
 // GetLastError is save!
Tested extensively here http://stackoverflow.com/questions/17918266/winapi-getlasterror-vs-marshal-getlastwin32error

// You should never PInvoke to GetLastError.  Call Marshal.GetLastWin32Error instead!
!!!!VB Signature:
 ' You should never PInvoke to GetLastError.  Call Marshal.GetLastWin32Error instead!
!!!!Boo Signature:
 [DllImport("kernel32.dll")]
 def GetLastError() as int:
     pass
!!!!Notes:
Calling GetLastError directly via PInvoke is not guaranteed to work due to the CLR's internal interaction with the operating system.  Instead, call Marshal.GetLastWin32Error.

Don't forget to include [SetLastError = true] in your function definition. For example:
        [DllImport("kernel32.dll", SetLastError = true)]
        static extern bool CloseHandle(IntPtr hObject);

To retrieve the error message corresponding to this error code, you can use the Win32Exception@msdn class, as explained in the FormatMessage page (look at the bottom of the page).

!!!!Alternative Managed API:
System.Runtime.InteropServices.Marshal.GetLastWin32Error@msdn

Call GetLastWin32Error immediately after the Win32 API call or the result is unpredictable. See MSDN:
http://msdn.microsoft.com/en-us/library/ms182199(v=vs.80).aspx

Documentation: GetLastError@msdn on MSDN