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DWORD WINAPI FormatMessage(
  __in      DWORD dwFlags,
  __in_opt  LPCVOID lpSource,
  __in      DWORD dwMessageId,
  __in      DWORD dwLanguageId,
  __out     LPTSTR lpBuffer,
  __in      DWORD nSize,
  __in_opt  va_list *Arguments
);

FormatMessageFromSystem(ErrorCode)
{
   VarSetCapacity(Buffer, 500)
   DllCall("FormatMessage"
      , "UInt", 0x1000      ; FORMAT_MESSAGE_FROM_SYSTEM
      , "Int", 0
      , "Int", ErrorCode
      , "Int", 0
      , "UInt", &Buffer
      , "UInt", 500
      , "Str", NULL)
   Return Buffer
}

MsgBox % FormatMessageFromSystem(0x1100)
FormatMessageFromSystem(ErrorCode)
{
   VarSetCapacity(Buffer, 2000)
   DllCall("FormatMessage"
      , "UInt", 0x1000      ; FORMAT_MESSAGE_FROM_SYSTEM
      , "UInt", 0
      , "UInt", ErrorCode
      , "UInt", 0x800 ;LANG_SYSTEM_DEFAULT (LANG_USER_DEFAULT=0x400)
      , "UInt", &Buffer
      , "UInt", 500
      , "UInt", 0)
   VarSetCapacity(buffer,-1)
   Return Buffer
}

MsgBox % FormatMessageFromSystem(0x1100)
FormatMessageFromSystem(ErrorCode)
{
   VarSetCapacity(Buffer, 2000)
   DllCall("FormatMessage"
      , "UInt", 0x1000      ; FORMAT_MESSAGE_FROM_SYSTEM
      , "UInt", 0
      , "UInt", ErrorCode
      , "UInt", 0x800 ;LANG_SYSTEM_DEFAULT (LANG_USER_DEFAULT=0x400)
      , "Str", Buffer
      , "UInt", 500
      , "UInt", 0)
   Return Buffer
}

MsgBox % FormatMessageFromSystem(0x1100)
FormatMessageFromSystem(ErrorCode)
{
   VarSetCapacity(Buffer, 2000, 32 )
   DllCall("FormatMessage"
      , "UInt", 0x1000      ; FORMAT_MESSAGE_FROM_SYSTEM
      , "UInt", 0
      , "UInt", ErrorCode
      , "UInt", 0x800 ;LANG_SYSTEM_DEFAULT (LANG_USER_DEFAULT=0x400)
      , "UInt", &Buffer
      , "UInt", 500
      , "UInt", 0)
   Return Buffer
}