iOS: OPENFILE write in app folder crashes instead of returning FALSE

[BdR]

In iOS, when you use OPENFILE to open a file in the app folder in write-mode, it crashes instead of returning FALSE. I know it sounds illogical to try to write to the app folder, but in previous versions this has always worked and it just returned FALSE.

I used this as one of the first-time startup checks (along with PLATFORMINFO$("DEVICETYPE"), iPhoneIsCracked etc.) and reported the results back to my database for analysis. I noticed that the default Lib files libGLBasiciPhone-egl.a and libpng-gf.a were updated very recently on 2 march 2012, so maybe OPENFILE was changed?

To be honest, the result of this check is not that important to me anymore, so as a workaround I will simply skip it. But anyway, here is my code. At the OPENFILE line I expected it to return FALSE but instead it crashes.

Code (glbasic) Select Expand

// -------------------------------------
// check if app folder is writable
// this could indicate a jailbroken iphone/ipod
// -------------------------------------
FUNCTION CheckAllowWriteAppFolder:

  LOCAL bResult%
  LOCAL bTmp%
  LOCAL Filename$

  Filename$ = "Media//appwritecheck.ini"

  // try to write new file in Media/ in appfolder
  bTmp = OPENFILE(1, Filename$, 0) // 0=write
  IF (bTmp = TRUE)
//    WRITESTR 1, "filecheck=1" // not needed
    bResult = TRUE
  ELSE
    bResult = FALSE
  ENDIF
  CLOSEFILE 1

  // remove file
  bTmp = DOESFILEEXIST(Filename$)
  IF (bTmp = TRUE)
    KILLFILE Filename$
  ENDIF

  // function result
  RETURN bResult

ENDFUNCTION

[MrTAToad]

Yes, it certainly shouldn't crash

[Kitty Hello]

Don't CLOSEFILE on a file that was not opened. Maybe?