Show NSData as binary in a NSString

问题:

I have a binary file (file.bin) in the resources folder, I want to read it and show it as binary. The idea its to put the binary information into a array, but, at first, I'm trying to show it in a UILabel, like that:

` NSData *databuffer; NSString *stringdata;

NSString *filePath = [[NSBundle mainBundle] pathForResource:@"file" ofType:@"bin"];  
NSData *myData = [NSData dataWithContentsOfFile:filePath];

if (myData) {  
        stringdata = [NSString stringWithFormat:@"%@",[myData description]]; 
        labelfile.text = stringdata;
}  

`

But it shows the data in HEX. How can I do it in binary to put it in a NSMutableArray? Thanks.

回答1:

I don't know if there is anything native that does that but I can propose a workaround solution. Why don't you do your own function that does the conversion. Here is my example:

In the place you get the Hex values:

NSString *str = @"Af01";
NSMutableString *binStr = [[NSMutableString alloc] init];

for(NSUInteger i=0; i<[str length]; i++)
{
    [binStr appendString:[self hexToBinary:[str characterAtIndex:i]]];
}
NSLog(@"Bin: %@", binStr);

The workaround function:

- (NSString *) hexToBinary:(unichar)myChar
{
    switch(myChar)
    {
        case '0': return @"0000";
        case '1': return @"0001";
        case '2': return @"0010";
        case '3': return @"0011";
        case '4': return @"0100";
        case '5': return @"0101";
        case '6': return @"0110";
        case '7': return @"0111";
        case '8': return @"1000";
        case '9': return @"1001";
        case 'a':
        case 'A': return @"1010";
        case 'b':
        case 'B': return @"1011";
        case 'c':
        case 'C': return @"1100";
        case 'd':
        case 'D': return @"1101";
        case 'e':
        case 'E': return @"1110";
        case 'f':
        case 'F': return @"1111";
    }
    return @"-1"; //means something went wrong, shouldn't reach here!
}

Hope this helps!