ErrorInAPI

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

example usage:

 calldll #...._ 
 .... 
 ..... 
 ret as boolean 
 if ret = 0 then notice "Error...."+ErrorMessageFromAPI$()[[code]] 

 function ErrorMessageFromAPI$() 
 calldll #kernel32, "GetLastError", _ 
 ErrorCode as ulong 
 dwFlags = _FORMAT_MESSAGE_FROM_SYSTEM 
 nSize = 1024 
 lpBuffer$ = space$(nSize); chr$(0) 
 dwMessageID = ErrorCode 
 
 calldll #kernel32, "FormatMessageA", _ 
 dwFlags as ulong, _ 
 lpSource as ulong, _ 
 dwMessageID as ulong, _ 
 dwLanguageID as ulong, _ 
 lpBuffer$ as ptr, _ 
 nSize as ulong, _ 
 Arguments as ulong, _ 
 result as ulong 
 
 ErrorMessageFromAPI$ = "Error ";ErrorCode;": "; left$(lpBuffer$, result) 
 end function code