Replace a File within a Zip

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Demonstrates how to replace a file within a .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;
}

success = zip.OpenZip("a.zip");
if (success != true) {
    MessageBox.Show(zip.LastErrorText);
    return;
}

Chilkat.ZipEntry entry;

//  Locate the entry:
entry = zip.FirstMatchingEntry("*HelloWorld123.txt");

if (!(entry == null )) {

    zip.DeleteEntry(entry);

    bool saveExtraPath;
    saveExtraPath = false;
    success = zip.AppendOneFileOrDir("c:/temp/HelloWorld123.txt",saveExtraPath);
    if (success != true) {
        MessageBox.Show(zip.LastErrorText);
        return;
    }

    success = zip.WriteZipAndClose();
    if (success != true) {
        MessageBox.Show(zip.LastErrorText);
        return;
    }

    MessageBox.Show("Entry replaced and .zip re-written.");

}
else {
    textBox1.Text += "Entry not found." + "\r\n";
    textBox1.Refresh();
}