(MFC) Append Files to Existing Zip w/out Rewriting Entire Zip

Demonstrates how to use the QuickAppend method to append files to an existing .zip archive. This method works by editing the existing .zip -- it does not rewrite or recompress the contents of the existing .zip. It is the fastest way to append additional files to a pre-existing large .zip archive. Note: The QuickAppend method is new and available in the pre-release downloads, or in official releases dated after 6-October-2007.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkZip.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkZip zip;

    // The NewZip method only initializes the Zip object -- it does
    // not create or write a .zip file.
    bool success = zip.NewZip("notUsed.zip");
    if (success != true) {
        strOut.append(zip.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Add a reference to a file.  This is the file that will
    // be added to a pre-existing .zip archive.  
    // Note: this does not read or compress the file contents --
    // it simply adds a reference to the zip object.
    bool saveExtraPath = false;
    success = zip.AppendOneFileOrDir("something.dat",saveExtraPath);
    if (success != true) {
        strOut.append(zip.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Appends the contents of the zip object to the preExisting.zip
    // zip archive.  preExisting.zip is opened, and the files
    // referenced by this zip object are streamed in, compressed,
    // and appended to the end of the archive.
    success = zip.QuickAppend("preExisting.zip");
    if (success != true) {
        strOut.append(zip.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("Success!");
    strOut.append("\r\n");

    // Note: Additional files, directory trees, or in-memory data
    // can be appended by calling AppendOneFileOrDir, AppendFiles,
    // AppendString, AppendData, etc. multiple times.
    // Whatever files and/or in-memory data that are referenced by
    // this zip object will be appended to preExisting.zip when
    // QuickAppend is called


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }