从捆绑中加载Objective-C BIO

Question

I would like to load a text file using BIO_new_file(myPath, "r") in objective-c. As path I obtain the current document directory from the bundle.

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *fileName = [NSString stringWithFormat:@"%@/test.txt", documentsDirectory];

NSLog(@"%@", fileName);

const char* cString = [fileName cStringUsingEncoding:NSUTF8StringEncoding];

BIO *temp = BIO_new_file(cString, "r");
if (!temp) {
    NSLog(@"Could not load file!");
    assert(false);
}

But the method couldn't load the file and I receive the Could not load file! .

Is this a known issue when using Openssl's BIO in objective-c? Are there any workarounds?

Answer 1

Perhaps there is no file named test.txt in your application's documents directory. Try logging the error code:

NSLog(@"error code = %s (%d)", strerror(errno), errno);