Unicode C

Remove an Entry from an Existing ZIP Using DeleteEntry

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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.

Unicode C

#include <C_CkZipW.h>
#include <C_CkZipEntryW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkZipW zip;
    const wchar_t *charset;
    HCkZipW zip2;
    HCkZipEntryW entry;

    success = FALSE;

    success = FALSE;

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

    zip = CkZipW_Create();

    success = CkZipW_NewZip(zip,L"original.zip");
    if (success == FALSE) {
        wprintf(L"%s\n",CkZipW_lastErrorText(zip));
        CkZipW_Dispose(zip);
        return;
    }

    charset = L"utf-8";

    success = CkZipW_AddString(zip,L"a.txt",L"Contents of file A",charset);
    if (success == FALSE) {
        wprintf(L"%s\n",CkZipW_lastErrorText(zip));
        CkZipW_Dispose(zip);
        return;
    }

    success = CkZipW_AddString(zip,L"b.txt",L"Contents of file B",charset);
    if (success == FALSE) {
        wprintf(L"%s\n",CkZipW_lastErrorText(zip));
        CkZipW_Dispose(zip);
        return;
    }

    success = CkZipW_AddString(zip,L"c.txt",L"Contents of file C",charset);
    if (success == FALSE) {
        wprintf(L"%s\n",CkZipW_lastErrorText(zip));
        CkZipW_Dispose(zip);
        return;
    }

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

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

    zip2 = CkZipW_Create();

    success = CkZipW_OpenZip(zip2,L"original.zip");
    if (success == FALSE) {
        wprintf(L"%s\n",CkZipW_lastErrorText(zip2));
        CkZipW_Dispose(zip);
        CkZipW_Dispose(zip2);
        return;
    }

    // Find the entry named "b.txt".
    entry = CkZipEntryW_Create();

    success = CkZipW_EntryOf(zip2,L"b.txt",entry);
    if (success == FALSE) {
        wprintf(L"%s\n",CkZipW_lastErrorText(zip2));
        CkZipW_Dispose(zip);
        CkZipW_Dispose(zip2);
        CkZipEntryW_Dispose(entry);
        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 = CkZipW_DeleteEntry(zip2,entry);
    if (success == FALSE) {
        wprintf(L"%s\n",CkZipW_lastErrorText(zip2));
        CkZipW_Dispose(zip);
        CkZipW_Dispose(zip2);
        CkZipEntryW_Dispose(entry);
        return;
    }

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

    success = CkZipW_WriteZipAndClose(zip2);
    if (success == FALSE) {
        wprintf(L"%s\n",CkZipW_lastErrorText(zip2));
        CkZipW_Dispose(zip);
        CkZipW_Dispose(zip2);
        CkZipEntryW_Dispose(entry);
        return;
    }

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

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


    CkZipW_Dispose(zip);
    CkZipW_Dispose(zip2);
    CkZipEntryW_Dispose(entry);

    }