Question

What it’s the equivalent in Objective-C of this C code:

FILE* file = fopen( [filePath UTF8String], "r, ccs=UTF-8");
if (file != 0)
{
    char buffer[1024];
    //seek to file position....
    fseek(file,11093, SEEK_CUR);
    int cnt = 0;
    while(fgets(buffer, 1024, file) != NULL)
    {   
        if (cnt>0) {
            if(buffer[0] == 'a') {
                break;
            }
            //Objective c syntax....
            NSString *string = [[NSString alloc] initWithCString: buffer];
         }
        cnt++;
    }
    fclose(file);
}

Answer 1

That is the equivalent. Objective-C is built on top of C, so every C function is usable in Objective-C.

There is a class hierarchy rooted at NSStream which, at first glance, may appear to be the Objective-C version of file streams–and for many uses, it is. But if you need to seek through an arbitrary stream, you’ll want to keep using fopen(), fseek(), etc.

An instance of NSInputStream created from a path to a file on disk will be seekable by getting/setting its NSStreamFileCurrentOffsetKey property. However, it’s often awkward to adapt existing FILE *-based code.

I guess what I’m saying is that if fopen() works for you, there’s no need to stop using it. 🙂