Xojo Plugin

Unzip a Text File Entry into a StringBuilder Using ZipEntry.UnzipToSb

See more Zip Examples

This example demonstrates how to use the ZipEntry.UnzipToSb method to inflate a text file entry directly into a StringBuilder object.

The ZIP entry is uncompressed entirely in memory and appended to the StringBuilder without creating a temporary file on disk.

This is useful when:

• Processing text files directly in memory
• Avoiding temporary filesystem files
• Reading configuration files, JSON, XML, CSV, or source code from ZIP archives
• Automatically converting line endings while inflating the text

The srcCharset argument specifies how the uncompressed bytes should be interpreted, such as:

• utf-8
• utf-16
• windows-1252

The lineEndingBehavior argument controls line-ending conversion:

• 0 — Leave line endings unchanged
• 1 — Convert all line endings to bare LF
• 2 — Convert all line endings to CRLF

Suppose the ZIP archive contains:

config/settings.json

The example inflates the JSON file directly into a StringBuilder.

Xojo Plugin

Dim success As Boolean
success = False

Dim zip As New Chilkat.Zip

// Open an existing ZIP archive.
success = zip.OpenZip("qa_data/zips/configFiles.zip")
If (success = False) Then
    System.DebugLog(zip.LastErrorText)
    Return
End If

// Locate the JSON file entry within the ZIP archive.
Dim entry As New Chilkat.ZipEntry

success = zip.EntryOf("config/settings.json",entry)
If (success = False) Then
    System.DebugLog("ZIP entry not found.")
    zip.CloseZip 
    Return
End If

// ------------------------------------------------------------
// Inflate the ZIP entry directly into a StringBuilder.
// 
// The uncompressed text is appended to the StringBuilder.
// 
Dim sb As New Chilkat.StringBuilder

// Leave line endings unchanged.
Dim lineEndingBehavior As Int32
lineEndingBehavior = 0

// Interpret the uncompressed bytes as UTF-8 text.
Dim srcCharset As String
srcCharset = "utf-8"

success = entry.UnzipToSb(lineEndingBehavior,srcCharset,sb)
If (success = False) Then
    System.DebugLog(entry.LastErrorText)
    Return
End If

System.DebugLog("Uncompressed text:")
System.DebugLog("")
System.DebugLog(sb.GetAsString())

zip.CloseZip 

System.DebugLog("Done.")