(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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#include <CkZip.h>
#include <CkZipEntry.h>

void ChilkatSample(void)
    {
    // 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..
    CkZip zip;

    bool success;
    zip.NewZip("qa_output/abc.zip");

    // Add some files..
    CkZipEntry *entry = zip.AppendString("a.txt","aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
    delete entry;
    entry = zip.AppendString("b.txt","bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
    delete entry;
    entry = zip.AppendString("c.txt","cccccccccccccccccccccccccccccccccccc");
    delete entry;

    // 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.
    CkZip zip2;
    zip2.OpenZip("qa_output/abc.zip");

    entry = zip2.GetEntryByName("b.txt");
    entry->ReplaceString("This is the new content.  bbbbbbbbbbbbbbbbbbbbbb","utf-8");
    delete entry;
    // Write the modified .zip back to "abc.zip"
    success = zip2.WriteZipAndClose();

    std::cout << "success." << "\r\n";
    }