ErrorInAPI

Code posted by Stefan Pendl on http://libertybasic.conforums.com/index.cgi tips board turned into a function.

example usage:
[[code]]

calldll #...._
....
.....
ret as boolean
if ret = 0 then notice "Error...."+ErrorMessageFromAPI$()[[code]]
[[code]]
[[code]]
function ErrorMessageFromAPI$()
   calldll #kernel32, "GetLastError", _
      ErrorCode as ulong
      dwFlags = _FORMAT_MESSAGE_FROM_SYSTEM
      nSize = 1024
      lpBuffer$ = space$(nSize); chr$(0)
      dwMessageID = ErrorCode

dwFlags = _FORMAT_MESSAGE_FROM_SYSTEM
nSize = 1024
lpBuffer$ = space$(nSize); chr$(0)
dwMessageID = ErrorCode

calldll   calldll #kernel32, "FormatMessageA", _
dwFlags
      dwFlags as ulong, _
lpSource
      lpSource as ulong, _
dwMessageID
      dwMessageID as ulong, _
dwLanguageID
      dwLanguageID as ulong, _
lpBuffer$
      lpBuffer$ as ptr, _
nSize
      nSize as ulong, _
Arguments
      Arguments as ulong, _
result
      result as ulong

ErrorMessageFromAPI$   ErrorMessageFromAPI$ = "Error ";ErrorCode;": "; left$(lpBuffer$, result)
end function
[[code]]