Deflate File

Demonstrates how to use the Deflate compression algorithm to compress a file. (The deflate compression algorithm is the most commonly used in the Zip archive file format.)

This code is capable of compressing any size file because the file data is compressed from input to output in a streaming mode. The output file contains only the deflated data (it is not a .zip, and there is no file structure or format).

The functionality in this example is available in pre-release only:
To use, unzip and add a reference to the enclosed DLL in your .NET project.

Download Chilkat .NET for 2.0 / 3.5 Framework

Download Chilkat .NET for 1.0 / 1.1 Framework

Dim compress As New Chilkat.Compression()

'  Any string argument automatically begins a 30-day trial.
Dim success As Boolean
success = compress.UnlockComponent("30-day trial")
If (success <> true) Then
    MsgBox("Compression component unlock failed")
    Exit Sub
End If


compress.Algorithm = "deflate"

'  Deflate this XML file:
success = compress.CompressFile("hamlet.xml","hamletDeflate.dat")
If (success <> true) Then
    MsgBox(compress.LastErrorText)
    Exit Sub
End If


'  Inflate back to the original:
success = compress.DecompressFile("hamletDeflate.dat","hamletInflated.xml")
If (success <> true) Then
    MsgBox(compress.LastErrorText)
    Exit Sub
End If


TextBox1.Text = TextBox1.Text & "Success!" & vbCrLf