Unicode C

Encrypt Already Existing Zip

See more Zip Examples

To encrypt an already existing non-encrypted .zip, the application must open the .zip, set the encryption related properties, and then re-write. Unicode C

#include <C_CkZipW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkZipW zip;
    int numFilesUnzipped;

    success = FALSE;

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

    zip = CkZipW_Create();

    // Open an unencrypted .zip
    success = CkZipW_OpenZip(zip,L"qa_data/zips/test.zip");
    if (success != TRUE) {
        wprintf(L"%s\n",CkZipW_lastErrorText(zip));
        CkZipW_Dispose(zip);
        return;
    }

    // Unzip to a temp directory.
    numFilesUnzipped = CkZipW_Unzip(zip,L"qa_output/tmp");
    if (numFilesUnzipped < 0) {
        wprintf(L"%s\n",CkZipW_lastErrorText(zip));
        CkZipW_Dispose(zip);
        return;
    }

    // Clear the zip object.
    CkZipW_NewZip(zip,L"qa_output/aesTest.zip");

    // Indicate that 128-bit AES encryption is to be used when writing the .zip
    CkZipW_putEncryption(zip,4);
    CkZipW_putEncryptKeyLength(zip,128);

    // Set the password.
    CkZipW_putEncryptPassword(zip,L"secret");

    // Append the files.
    CkZipW_putAppendFromDir(zip,L"qa_output/tmp");
    success = CkZipW_AppendFiles(zip,L"*.*",TRUE);
    if (success != TRUE) {
        wprintf(L"%s\n",CkZipW_lastErrorText(zip));
        CkZipW_Dispose(zip);
        return;
    }

    // Write the .zip and close it.
    success = CkZipW_WriteZipAndClose(zip);
    if (success != TRUE) {
        wprintf(L"%s\n",CkZipW_lastErrorText(zip));
        CkZipW_Dispose(zip);
        return;
    }

    wprintf(L"Success.\n");


    CkZipW_Dispose(zip);

    }