Converting Between Nsdata and Base64 Strings

Converting between NSData and base64 strings

Scroll down to the Conclusion section on the page you linked and download the provided NSData+Base64 files. Its the best solution I have seen so far and is incredibly easy to use. If you can learn anything about Cocoa, you can learn to use that project.

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Example

NSString *originalString = [NSString stringWithFormat:@"test"]; 
NSData *data = [NSData dataFromBase64String:originalString];  
NSLog([data base64EncodedString]); 

The above will print out the original string after converting it to base64 and back to a normal unencoded string.

How to convert Base64 string to NSData?

To convert from Base64 string to NSData

 let nsd: NSData = NSData(base64EncodedString: Image, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)!

To Convert to Blob

nsd.datatypeValue

Converting NSData to base64

EDIT

As of OS X 10.9 / iOS 7, this is built into the frameworks.

See -[NSData base64EncodedDataWithOptions:]

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Prior to iOS7/OS X 10.9:

Matt Gallagher wrote an article on this very topic. At the bottom he gives a link to his embeddable code for iPhone.

On the mac you can use the OpenSSL library, on the iPhone he writes his own impl.

Creating a base-64 string from NSData

please try to search before posting questions I already post a answer for this here -
Verifying a Receipt with the App Store - try this function there.

Objective-c Base64 NSString to NSData conversion

I believe you issue is that your not sending in a base64 encoded string to initWithBase64EncodedString.

How to convert base64 into NSDATA in swift

This works:

Swift 3 and 4:

var audioData = Data(base64Encoded: recording_base64, options: .ignoreUnknownCharacters)

Swift 2:

var audioData = NSData(base64EncodedString: recording_base64, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)

Convert between UIImage and Base64 string

Swift

First we need to have image's NSData

//Use image name from bundle to create NSData
let image : UIImage = UIImage(named:"imageNameHere")!
//Now use image to create into NSData format
let imageData:NSData = UIImagePNGRepresentation(image)!

//OR next possibility

//Use image's path to create NSData
let url:NSURL = NSURL(string : "urlHere")!
//Now use image to create into NSData format
let imageData:NSData = NSData.init(contentsOfURL: url)!

Swift 2.0 > Encoding

let strBase64:String = imageData.base64EncodedStringWithOptions(.Encoding64CharacterLineLength)

Swift 2.0 > Decoding

let dataDecoded:NSData = NSData(base64EncodedString: strBase64, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)!

Swift 3.0 > Decoding

let dataDecoded : Data = Data(base64Encoded: strBase64, options: .ignoreUnknownCharacters)!

Encoding :

let strBase64 = imageData.base64EncodedString(options: .lineLength64Characters)
print(strBase64)

Decoding :

let dataDecoded:NSData = NSData(base64EncodedString: strBase64, options: NSDataBase64DecodingOptions(rawValue: 0))!
let decodedimage:UIImage = UIImage(data: dataDecoded)!
print(decodedimage)
yourImageView.image = decodedimage

Swift 3.0

let dataDecoded : Data = Data(base64Encoded: strBase64, options: .ignoreUnknownCharacters)!
let decodedimage = UIImage(data: dataDecoded)
yourImageView.image = decodedimage

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Objective-C

iOS7 > version

You can use NSData's base64EncodedStringWithOptions

Encoding :

- (NSString *)encodeToBase64String:(UIImage *)image {
 return [UIImagePNGRepresentation(image) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
}

Decoding :

- (UIImage *)decodeBase64ToImage:(NSString *)strEncodeData {
  NSData *data = [[NSData alloc]initWithBase64EncodedString:strEncodeData options:NSDataBase64DecodingIgnoreUnknownCharacters];
  return [UIImage imageWithData:data];
}

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iOS 6.1 and < version

First Option : Use this link to encode and decode image

Add Base64 class in your project.

Encoding :

 NSData* data = UIImageJPEGRepresentation(yourImage, 1.0f);
 NSString *strEncoded = [Base64 encode:data];

Decoding :

 NSData* data = [Base64 decode:strEncoded ];;
 image.image = [UIImage imageWithData:data];

Another Option: Use QSUtilities for encoding and decoding

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How to decode / convert a base64 string to NSData?

This is what I was looking for.

+ (NSData *)base64DataFromString: (NSString *)string
{
unsigned long ixtext, lentext;
unsigned char ch, inbuf[4], outbuf[3];
short i, ixinbuf;
Boolean flignore, flendtext = false;
const unsigned char *tempcstring;
NSMutableData *theData;

if (string == nil)
{
    return [NSData data];
}

ixtext = 0;

tempcstring = (const unsigned char *)[string UTF8String];

lentext = [string length];

theData = [NSMutableData dataWithCapacity: lentext];

ixinbuf = 0;

while (true)
{
    if (ixtext >= lentext)
    {
        break;
    }

    ch = tempcstring [ixtext++];

    flignore = false;

    if ((ch >= 'A') && (ch <= 'Z'))
    {
        ch = ch - 'A';
    }
    else if ((ch >= 'a') && (ch <= 'z'))
    {
        ch = ch - 'a' + 26;
    }
    else if ((ch >= '0') && (ch <= '9'))
    {
        ch = ch - '0' + 52;
    }
    else if (ch == '+')
    {
        ch = 62;
    }
    else if (ch == '=')
    {
        flendtext = true;
    }
    else if (ch == '/')
    {
        ch = 63;
    }
    else
    {
        flignore = true; 
    }

    if (!flignore)
    {
        short ctcharsinbuf = 3;
        Boolean flbreak = false;

        if (flendtext)
        {
            if (ixinbuf == 0)
            {
                break;
            }

            if ((ixinbuf == 1) || (ixinbuf == 2))
            {
                ctcharsinbuf = 1;
            }
            else
            {
                ctcharsinbuf = 2;
            }

            ixinbuf = 3;

            flbreak = true;
        }

        inbuf [ixinbuf++] = ch;

        if (ixinbuf == 4)
        {
            ixinbuf = 0;

            outbuf[0] = (inbuf[0] << 2) | ((inbuf[1] & 0x30) >> 4);
            outbuf[1] = ((inbuf[1] & 0x0F) << 4) | ((inbuf[2] & 0x3C) >> 2);
            outbuf[2] = ((inbuf[2] & 0x03) << 6) | (inbuf[3] & 0x3F);

            for (i = 0; i < ctcharsinbuf; i++)
            {
                [theData appendBytes: &outbuf[i] length: 1];
            }
        }

        if (flbreak)
        {
            break;
        }
    }
}

return theData;
}

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