Question

I’m porting a C++ lib to iOS, and have run into an issue where the code calls tmpnam. The function returns “var/tmp/tmp.0.0xGlzv” which I assume is outside of the “sandbox” that my app is allowed to play in. A subsquent fopen returns “Operation not permitted”. Is there a viable replacement?

Answer 1

What about

[NSTemporaryDirectory() stringByAppendingPathComponent:@"myTempFile1.tmp"];

?

For a unique filename, try something like this:

NSString *uniqueTempFile()
{
    int i = 1;
    while (YES)
    {
        NSString *currentPath = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"%i.tmp", i]];
        if (![[NSFileManager defaultManager] fileExistsAtPath:currentPath])
            return currentPath;
        else
        {
            i++;
        }
    }
}

This is simple, but probably not the most memory-efficent answer.