error for FSOpenFork

Discussion in 'Mac Programming' started by pallavi0703, Jun 24, 2008.

  1. macrumors newbie


    Dec 12, 2007
    Hello All,
    In Xcode Carbon C bundel application I want to open a file and read data from it, but at runtime I am not able to make FSRef from file path. Following code I am using please tell me what changed are required in this code.

    CFURLRef url ;
    Boolean flag;
    FSRef ref , ref2 ;
    OSErr error ,result;
    char *volname = NULL;
    char revpath[PATH_MAX];
    HFSUniStr255 dataForkName;
    SInt16 forkRefNum;

    volumeNameForPath("/", &volname);//user defined function to get default volume name
    strcat(volname,":CFURL.txt");//now volname = "Macintosh HD:CFURL.txt" and strlen((char*)volname = 22

    url = CFURLCreateFromFileSystemRepresentation(kCFAllocatorDefault,volname,strlen((char*)volname),false);
    flag = CFURLGetFSRef((CFURLRef)url , &ref);//true if success else false
    //flag returned is 0 it should be 1


    error = FSPathMakeRef(volname,&ref2,false);

    result = FSGetDataForkName(&dataForkName);
    if (result != noErr) {
    syslog(LOG_INFO, "FSGetDataForkName() returned %d", result);

    result = FSOpenFork(&ref, dataForkName.length, dataForkName.unicode, fsRdPerm, &forkRefNum);//result returned is -35.

    Thanks & Regards,
  2. macrumors G5


    Nov 25, 2005
    Read the documentation for CFURLCreateFromFileSystemRepresentation. The comment for the second parameter says "The character bytes to convert into a CFURL object. This should be the path as you would use in POSIX function calls."
  3. thread starter macrumors newbie


    Dec 12, 2007
    now error for FSReadFork

    Hello gnasher729,
    Now I am using posix file path ,
    but for reading file every time new error code is returned like -4628 ,-4132,-5380 etc.

    ByteCount requestCount;
    void *buffer;
    ByteCount *actualCount;

    result = FSOpenFork(&ref, dataForkName.length, dataForkName.unicode, fsRdPerm, &forkRefNum);// returns noErr
    if(result == noErr) {

    buffer = malloc(1024);
    requestCount = 128;
    Err1= FSReadFork(forkRefNum,fsFromStart,0, requestCount,&buffer, &actualCount);//program get hanged

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