objective c - How to convert nsdata to byte array

arrays, iphone, objective-c

Solution

I'm not 100% sure this is what you are looking for or not. Try:

UIImage *image = [UIImage imageNamed:@"image.png"];
NSData *data = UIImagePNGRepresentation(image);
NSUInteger len = data.length;
uint8_t *bytes = (uint8_t *)[data bytes];
NSMutableString *result = [NSMutableString stringWithCapacity:len * 3];
[result appendString:@"["];
for (NSUInteger i = 0; i < len; i++) {
    if (i) {
        [result appendString:@","];
    }
    [result appendFormat:@"%d", bytes[i]];
}
[result appendString:@"]"];

Is this what you need?

Problem

I am working with UIImage conversion to NSData. And I want to convert NsData to Byte Array and post that Byte array to server with the help of json Parser. If i am passing following type of static string to server it accept and store. Following is just example string syntax. i want follwoing type of byte array to post data to server. [255,216,255,224,0,16,74,70,73,70,0,1,1,1,0,96,0,96,0,0,255,219,0,67,0,8,6,6,7,6,5,8,7,7,7,9,9,8,10,12,...] For above result i am converting image to data as following: ``` UIImage *image = [UIImage imageNamed:@"image.png"]; NSData *data = UIImagePNGRepresentation(image); ``` Now i want to convert NSdata to byte array for that i am using following code: ``` NSUInteger len = [data length]; Byte *byteData = (Byte*)malloc(len); memcpy(byteData, [data bytes], len); free(byteData) ``` and i also store this to NSdata. but cant get about result. I also typed about code with looping but every time it gives aPNG as result. Am i doing any thing wrong in the above code? Please provide me some help and also request to provide any help for this. Thanks in advance.

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