Quoted-Printable Encode/Decode a String

Objective-C example to quoted-printable encode and decode a string.

Download: Chilkat Cocoa Objective-C Libraries

NSMutableString *strOutput = [NSMutableString stringWithCapacity:1000];

CkoCrypt2 *crypt = [[[CkoCrypt2 alloc] init] autorelease];

//  Any string argument automatically begins the 30-day trial.
BOOL success;
success = [crypt UnlockComponent: @"30-day trial"];
if (success != YES) {
    [strOutput appendString: crypt.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

//  Here's a string in Icelandic using non us-ascii chars:
NSString *s;
s = @"Ég get etið gler án þess að meiða mig.";

crypt.CryptAlgorithm = @"none";
crypt.EncodingMode = @"quoted-printable";

//  Quoted-printable encode/decode the iso-8859-1
//  representation of the string.  Notice how each
//  Icelandic char is represented by 1 byte:
crypt.Charset = @"iso-8859-1";
NSString *qp;
qp = [crypt EncryptStringENC: s];
[strOutput appendString: @"iso-8859-1:"];
[strOutput appendString: @"\n"];
[strOutput appendString: qp];
[strOutput appendString: @"\n"];
NSString *decoded;
decoded = [crypt DecryptStringENC: qp];
[strOutput appendString: decoded];
[strOutput appendString: @"\n"];

//  Now do the same using utf-8. Notice how each
//  Icelandic char is represented by 2 bytes in utf-8:
crypt.Charset = @"utf-8";

qp = [crypt EncryptStringENC: s];
[strOutput appendString: @"utf-8:"];
[strOutput appendString: @"\n"];
[strOutput appendString: qp];
[strOutput appendString: @"\n"];

decoded = [crypt DecryptStringENC: qp];
[strOutput appendString: decoded];
[strOutput appendString: @"\n"];

self.mainTextField.stringValue = strOutput;