(Objective-C) Replace/Update a FIle in a .zip

Demonstrates how to replace/update a file from a .zip. Note: This requires the entire .zip to be rewritten.

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#import <CkoZip.h>
#import <CkoZipEntry.h>

// This requires the Chilkat Zip API to have been previously unlocked.
// See Unlock Chilkat Zip for sample code.

// First prepare a .zip and write it..
CkoZip *zip = [[CkoZip alloc] init];

BOOL success;
[zip NewZip: @"qa_output/abc.zip"];

// Add some files..
CkoZipEntry *entry = [zip AppendString: @"a.txt" str: @"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"];

entry = [zip AppendString: @"b.txt" str: @"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"];

entry = [zip AppendString: @"c.txt" str: @"cccccccccccccccccccccccccccccccccccc"];

// Write to qa_output/abc.zip
// This .zip contains three files: a.txt, b.txt, and c.txt
success = [zip WriteZipAndClose];

// -------------------------------------------------------------------
// Open abc.zip, replace the content of the "b.txt" entry with something else, and re-write.
CkoZip *zip2 = [[CkoZip alloc] init];
[zip2 OpenZip: @"qa_output/abc.zip"];

entry = [zip2 GetEntryByName: @"b.txt"];
[entry ReplaceString: @"This is the new content.  bbbbbbbbbbbbbbbbbbbbbb" charset: @"utf-8"];

// Write the modified .zip back to "abc.zip"
success = [zip2 WriteZipAndClose];

NSLog(@"%@",@"success.");