Visual Basic 6.0

Compress a File to Gzip in Memory using BinData

See more Gzip Examples

This example demonstrates how to use the CompressFileBd method to compress a file into Gzip format and store the compressed result in memory using a BinData object.

The input file is read from disk and compressed, with the resulting .gz data placed in the BinData instance. This allows your application to work with the compressed data entirely in memory before deciding what to do next.

Finally, the example shows how the in-memory Gzip data can be written to a file, which is useful for saving or distributing the compressed output.

Visual Basic 6.0

Dim success As Long
success = 0

' This example demonstrates how to compress a file into Gzip format
' and store the compressed result in a BinData object (in memory).

Dim gzip As New ChilkatGzip
Dim bd As New ChilkatBinData

' The file to be compressed:
Dim filePath As String
filePath = "example.txt"

' Compress the file into the BinData object:
success = gzip.CompressFileBd(filePath,bd)
If (success = 0) Then
    Debug.Print gzip.LastErrorText
    Exit Sub
End If

' At this point, "bd" contains the Gzip-compressed data in memory.
Debug.Print "Compression successful."
Debug.Print "Compressed size (bytes): " & bd.NumBytes

' (Optional) Save the in-memory Gzip data to a file:
success = bd.WriteFile("example.txt.gz")
If (success = 0) Then
    Debug.Print bd.LastErrorText
    Exit Sub
End If

Debug.Print "Gzip file written to example.txt.gz"