Karuppu MGR Karuppu MGR - 6 months ago 25
iOS Question

Accessing filename out of nsurl and converting the same to base 64

I'm using the following code to retrieve an image.

UIImage *image = [info valueForKey:UIImagePickerControllerOriginalImage];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];

NSURL *path = [info valueForKey:UIImagePickerControllerReferenceURL];
NSString *base64String = [UIImagePNGRepresentation(image) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];



  1. When I try to print the path, its printing the entire file path but How can I get the file name out of
    NSURL
    ?

  2. After accessing the path, I wish to convert the image to
    base 64
    using the path. How can I do so?


Answer

you can get the file name using

NSString *theFileName = [[string lastPathComponent] stringByDeletingPathExtension];

And use below code for base64 conversation

- (NSString*)base64forData:(NSData*) theData
{
    const uint8_t* input = (const uint8_t*)[theData bytes];
    NSInteger length = [theData length];

    static char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

    NSMutableData* data = [NSMutableData dataWithLength:((length + 2) / 3) * 4];
    uint8_t* output = (uint8_t*)data.mutableBytes;

    NSInteger i;
    for (i=0; i < length; i += 3) {
        NSInteger value = 0;
        NSInteger j;
        for (j = i; j < (i + 3); j++) {
            value <<= 8;

            if (j < length) {
                value |= (0xFF & input[j]);
            }
        }

        NSInteger theIndex = (i / 3) * 4;
        output[theIndex + 0] =                    table[(value >> 18) & 0x3F];
        output[theIndex + 1] =                    table[(value >> 12) & 0x3F];
        output[theIndex + 2] = (i + 1) < length ? table[(value >> 6)  & 0x3F] : '=';
        output[theIndex + 3] = (i + 2) < length ? table[(value >> 0)  & 0x3F] : '=';
    }

    return [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
}
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