Question:
How can I get a string representation of the last Windows error
value returned by the Windows GetLastError?
Answer:
Use the RTL function SysErrorMessage(GetLastError).
Example:
procedure TForm1.Button1Click(Sender: TObject);
begin
{Cause a Windows system error message to be logged}
ShowMessage(IntToStr(lStrLen(nil)));
ShowMessage(SysErrorMessage(GetLastError));
end;