(C# UWP/WinRT) Compress String Feed to Base64

This example receives incoming text data in chunks, compresses as a stream, and accumulates the compressed data in base64.

The purpose is to demonstrate the BeginCompressStringENC, MoreCompressStringENC, and EndCompressStringENC methods.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

bool success;
Chilkat.StringBuilder sbCompressedBase64 = new Chilkat.StringBuilder();

Chilkat.Compression compress = new Chilkat.Compression();
compress.Algorithm = "deflate";
compress.Charset = "utf-8";
compress.EncodingMode = "base64";

Chilkat.StringBuilder sbIndex = new Chilkat.StringBuilder();

int i;
for (i = 0; i <= 24; i++) {
    // Note: It is possible (and normal) for a BeginCompress* or MoreCompress* method to return
    // an empty string (or 0 bytes).  When this happens, the input data is not lost.  It will be flushed
    // in a subsequent call.
    sbIndex.Clear();
    sbIndex.AppendInt(i);
    if (i == 0) {
        sbCompressedBase64.Append(await compress.BeginCompressStringENCAsync(sbIndex.GetAsString()));
    }
    else {
        sbCompressedBase64.Append(await compress.MoreCompressStringENCAsync(sbIndex.GetAsString()));
    }

    sbCompressedBase64.Append(await compress.MoreCompressStringENCAsync(": This is a line of data to be compressed...\r\n"));
}

// Flush any remaining output.
sbCompressedBase64.Append(await compress.EndCompressStringENCAsync());

Debug.WriteLine("The base64 encoded compressed text:");
Debug.WriteLine(sbCompressedBase64.GetAsString());

// Now decompress in one call:
string originalText = await compress.DecompressStringENCAsync(sbCompressedBase64.GetAsString());
Debug.WriteLine(originalText);