How to convert Base64 encoded NSString into Byte Array(Java) in ios? - ios

Question

I have an Image that is converted into NSData and which in-turn is converted into base64 encoded NSString. Now i have a service that accepts this base64 encoded string in only Byte Array(Java Supported). I tried different options but i am not able to convert the encoded string into Byte Array type. Can someone please help me on how to convert the encoded string into Byte Array(Java supported)?
Below is my answer for this. I came to know that the easiest way is to convert the image data into byte array directly without base64encoding the data.

Answer 1

NSError* error;
NSString* str=[[NSBundle mainBundle] pathForResource:#"black-circle" ofType:#"png"];
NSData* data= [NSData dataWithContentsOfFile:str options:NSDataReadingUncached error:&error];
NSInteger length=[data length];
const char* dataBytes=[data bytes];
Now you can traverse each byte using dataBytes pointer.
Hope this helps.

Answer 2

You can try out :
Use-[NSString UTF8String] which returns const char*.
or this link will help you :
Convert NSString into byte array iphone

Answer 3

We can get the NSdata from the NSStirng and then convert NSData into Byte Array. The easier way is to convert the captured image data into Byte Array using uint8_t. Below is the code snippet that does the trick.
NSData to Byte Array:-
NSData *data = UIImagePNGRepresentation(imageCaptured);
uint8_t byteArray[[data length]];
[data getBytes:&byteArray];
NSMutableString *byteArrayString = [[NSMutableString alloc]init];
for (int i = 0 ; i < sizeof(byteArray); i++) {
[byteArrayString appendString:[NSString stringWithFormat:#"%d,",byteArray[i]]];
}
// Removing last extra comma
[byteArrayString deleteCharactersInRange:NSMakeRange([byteArrayString length]-1, 1)];