Futurebasic/Language/Reference/syserror function

Fuck s helpful info on topic SYSERROR Syntax systemErrorCode% = SYSERROR Description This function returns the value of the SYSERROR variable, which is an internal variable that FB uses to store the MacOS result codes from disk i/o operations. While SYSERROR usually returns toolbox result codes, it also returns three error codes that are unique to FB. These are: Example: -9999 The file number used was outside of the legal range. Example: OPEN "I",#-1000-8888 The program attempted to open a file using a file number that was already in use. Example: OPEN "R",#1,"Test" OPEN "R",#1,"Something Else" -6666 An illegal open type was used. Example: OPEN "XYZ",#1,"Test" See Also SYSERROR statement; ERROR function; ON ERROR