Unzip an AES Encrypted Text File directly into a String Variable

A common need is to unzip from an AES encrypted Zip archive directly into a string variable, such that the unencrypted file never resides on disk, even temporarily. This example shows how to do it.

Download: Chilkat Cocoa Objective-C Libraries

NSMutableString *strOutput = [NSMutableString stringWithCapacity:1000];

CkoZip *zip = [[[CkoZip alloc] init] autorelease];

BOOL success;

//  Any string unlocks the component for the 1st 30-days.
success = [zip UnlockComponent: @"Anything for 30-day trial"];
if (success != YES) {
    [strOutput appendString: zip.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

//  This example opens a WinZip-compatible AES encrypted
//  .zip that contains a single file: hamlet.xml.

//  It decrypts and unzips hamlet.xml directly into a string
//  variable.
[zip SetPassword: @"secret"];
success = [zip OpenZip: @"hamlet.zip"];
if (success != YES) {
    [strOutput appendString: zip.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

CkoZipEntry *entry;
NSString *xmlText;

entry = [zip GetEntryByName: @"hamlet.xml"];
if (!(entry == nil )) {
    xmlText = [entry InflateToString2];
    [strOutput appendString: xmlText];
    [strOutput appendString: @"\n"];

}
else {
    [strOutput appendString: @"Failed to find entry in zip"];
    [strOutput appendString: @"\n"];
}


self.mainTextField.stringValue = strOutput;