Append File and Rename within Zip

Download: Chilkat .NET Assemblies

How to append an additional file to a .zip and rename it within the .zip.

Chilkat.Zip zip = new Chilkat.Zip();

bool success;

//  Any string unlocks the component for the 1st 30-days.
success = zip.UnlockComponent("Anything for 30-day trial");
if (success != true) {
    MessageBox.Show(zip.LastErrorText);
    return;
}

//  Open an existing .zip.
//  Note: Opening a zip does not read the entire zip into memory.
//  It simply opens the zip and makes it ready for unzipping
//  or retrieving information and/or data.
success = zip.OpenZip("a.zip");
if (success != true) {
    MessageBox.Show(zip.LastErrorText);
    return;
}

//  Save the current number of entries.
int numEntries;
numEntries = zip.NumEntries;

//  Append a new file to the .zip.
//  The new entry is at index numEntries (indexing begins at 0).
//  Note: The AppendOneFileOrDir simply adds a reference to the
//  file to the zip object.  The file is not actually read
//  or physically added to the .zip file until the WriteZip or
//  WriteZipAndClose method is called.
bool saveExtraPath;
saveExtraPath = false;
success = zip.AppendOneFileOrDir("hamlet.xml",saveExtraPath);
if (success != true) {
    MessageBox.Show(zip.LastErrorText);
    return;
}

//  Get the entry we just added:
Chilkat.ZipEntry entry;
entry = zip.GetEntryByIndex(numEntries);

//  Change the filename.
//  The zip component remembers the file referenced in the filesystem.
//  When the zip is written, the "hamlet.xml" file is read and
//  compressed, but the filename within the zip will be "shakespearePlay.xml".
entry.FileName = "shakespearePlay.xml";

//  Write the .zip
//  The Chilkat Zip component always writes to a temporary file
//  first.  This is to ensure that (in cases like this), if something
//  goes wrong we don't lose the original .zip.  If the write
//  finishes without error, it is moved to the destination
//  file, thus overwriting it.  The TempDir property controls
//  the directory where the temp zip is written.
success = zip.WriteZipAndClose();
if (success != true) {
    MessageBox.Show(zip.LastErrorText);
    return;
}