C#

Remove an Entry from an Existing ZIP Using DeleteEntry

See more Zip Examples

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.

C#

bool success = false;

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

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

success = zip.NewZip("original.zip");
if (success == false) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

string charset = "utf-8";

success = zip.AddString("a.txt","Contents of file A",charset);
if (success == false) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

success = zip.AddString("b.txt","Contents of file B",charset);
if (success == false) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

success = zip.AddString("c.txt","Contents of file C",charset);
if (success == false) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

//  Write the ZIP archive to disk.
//  
//  The ZIP now contains:
//  
//      a.txt
//      b.txt
//      c.txt
//  
success = zip.WriteZipAndClose();
if (success == false) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

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

Chilkat.Zip zip2 = new Chilkat.Zip();

success = zip2.OpenZip("original.zip");
if (success == false) {
    Debug.WriteLine(zip2.LastErrorText);
    return;
}

//  Find the entry named "b.txt".
Chilkat.ZipEntry entry = new Chilkat.ZipEntry();

success = zip2.EntryOf("b.txt",entry);
if (success == false) {
    Debug.WriteLine(zip2.LastErrorText);
    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 = zip2.DeleteEntry(entry);
if (success == false) {
    Debug.WriteLine(zip2.LastErrorText);
    return;
}

//  Write the modified ZIP archive to a new file.
zip2.FileName = "modified.zip";

success = zip2.WriteZipAndClose();
if (success == false) {
    Debug.WriteLine(zip2.LastErrorText);
    return;
}

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

Debug.WriteLine("ZIP archive updated successfully.");