(C++) Unzip a Text File Entry into a StringBuilder Using ZipEntry.UnzipToSb

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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.

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#include <CkZip.h>
#include <CkZipEntry.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    bool success = false;

    CkZip zip;

    // Open an existing ZIP archive.
    success = zip.OpenZip("qa_data/zips/configFiles.zip");
    if (success == false) {
        std::cout << zip.lastErrorText() << "\r\n";
        return;
    }

    // Locate the JSON file entry within the ZIP archive.
    CkZipEntry entry;

    success = zip.EntryOf("config/settings.json",entry);
    if (success == false) {
        std::cout << "ZIP entry not found." << "\r\n";
        zip.CloseZip();
        return;
    }

    // ------------------------------------------------------------
    // Inflate the ZIP entry directly into a StringBuilder.
    // 
    // The uncompressed text is appended to the StringBuilder.
    // 
    CkStringBuilder sb;

    // Leave line endings unchanged.
    int lineEndingBehavior = 0;

    // Interpret the uncompressed bytes as UTF-8 text.
    const char *srcCharset = "utf-8";

    success = entry.UnzipToSb(lineEndingBehavior,srcCharset,sb);
    if (success == false) {
        std::cout << entry.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Uncompressed text:" << "\r\n";
    std::cout << "" << "\r\n";
    std::cout << sb.getAsString() << "\r\n";

    zip.CloseZip();

    std::cout << "Done." << "\r\n";
    }