Go

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.

Go

    success := false

    zip := chilkat.NewZip()

    // Open an existing ZIP archive.
    success = zip.OpenZip("qa_data/zips/configFiles.zip")
    if success == false {
        fmt.Println(zip.LastErrorText())
        zip.DisposeZip()
        return
    }

    // Locate the JSON file entry within the ZIP archive.
    entry := chilkat.NewZipEntry()

    success = zip.EntryOf("config/settings.json",entry)
    if success == false {
        fmt.Println("ZIP entry not found.")
        zip.CloseZip()
        zip.DisposeZip()
        entry.DisposeZipEntry()
        return
    }

    // ------------------------------------------------------------
    // Inflate the ZIP entry directly into a StringBuilder.
    // 
    // The uncompressed text is appended to the StringBuilder.
    // 
    sb := chilkat.NewStringBuilder()

    // Leave line endings unchanged.
    lineEndingBehavior := 0

    // Interpret the uncompressed bytes as UTF-8 text.
    srcCharset := "utf-8"

    success = entry.UnzipToSb(lineEndingBehavior,srcCharset,sb)
    if success == false {
        fmt.Println(entry.LastErrorText())
        zip.DisposeZip()
        entry.DisposeZipEntry()
        sb.DisposeStringBuilder()
        return
    }

    fmt.Println("Uncompressed text:")
    fmt.Println("")
    fmt.Println(*sb.GetAsString())

    zip.CloseZip()

    fmt.Println("Done.")

    zip.DisposeZip()
    entry.DisposeZipEntry()
    sb.DisposeStringBuilder()