(Unicode C++) Remove an Entry from an Existing ZIP Using DeleteEntry

This example demonstrates how to use the DeleteEntry method to remove a file from an existing ZIP archive.

The example:

• Creates a ZIP archive containing three text files
• Opens the ZIP archive for modification
• Finds and deletes one entry
• Writes the modified ZIP archive to a new filename

Suppose the original ZIP archive contains:

a.txt
b.txt
c.txt

After deleting b.txt, the modified ZIP archive contains:

a.txt
c.txt

The entry is removed only from the in-memory ZIP object until a Write* method is called.

Note: This example requires Chilkat v11.0.0 or greater.

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#include <CkZipW.h>
#include <CkZipEntryW.h>

void ChilkatSample(void)
    {
    bool success = false;

    success = false;

    // ------------------------------------------------------------
    // First create a ZIP archive containing three text files.

    CkZipW zip;

    success = zip.NewZip(L"original.zip");
    if (success == false) {
        wprintf(L"%s\n",zip.lastErrorText());
        return;
    }

    const wchar_t *charset = L"utf-8";

    success = zip.AddString(L"a.txt",L"Contents of file A",charset);
    if (success == false) {
        wprintf(L"%s\n",zip.lastErrorText());
        return;
    }

    success = zip.AddString(L"b.txt",L"Contents of file B",charset);
    if (success == false) {
        wprintf(L"%s\n",zip.lastErrorText());
        return;
    }

    success = zip.AddString(L"c.txt",L"Contents of file C",charset);
    if (success == false) {
        wprintf(L"%s\n",zip.lastErrorText());
        return;
    }

    // Write the ZIP archive to disk.
    // 
    // The ZIP now contains:
    // 
    //     a.txt
    //     b.txt
    //     c.txt
    // 
    success = zip.WriteZipAndClose();
    if (success == false) {
        wprintf(L"%s\n",zip.lastErrorText());
        return;
    }

    // ------------------------------------------------------------
    // Open the existing ZIP archive for modification.

    CkZipW zip2;

    success = zip2.OpenZip(L"original.zip");
    if (success == false) {
        wprintf(L"%s\n",zip2.lastErrorText());
        return;
    }

    // Find the entry named "b.txt".
    CkZipEntryW entry;

    success = zip2.EntryOf(L"b.txt",entry);
    if (success == false) {
        wprintf(L"%s\n",zip2.lastErrorText());
        return;
    }

    // Remove the entry from the in-memory ZIP object.
    // 
    // At this point, the original ZIP file on disk is unchanged.
    // The deletion takes effect only after WriteZip or
    // WriteZipAndClose is called.
    success = zip2.DeleteEntry(entry);
    if (success == false) {
        wprintf(L"%s\n",zip2.lastErrorText());
        return;
    }

    // Write the modified ZIP archive to a new file.
    zip2.put_FileName(L"modified.zip");

    success = zip2.WriteZipAndClose();
    if (success == false) {
        wprintf(L"%s\n",zip2.lastErrorText());
        return;
    }

    // The modified ZIP now contains:
    // 
    //     a.txt
    //     c.txt
    // 

    wprintf(L"ZIP archive updated successfully.\n");
    }