C#

Transition from BeginCompressStringENC to FirstChunk/LastChunk

Provides instructions for replacing deprecated BeginCompressStringENC method calls with using FirstChunk/LastChunk properties. C#

bool success = false;

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

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();

//  ----------------------------------------------------------------------------------
//  This is the deprecated way of compressing in chunks using Begin/More/End methods..
//  ----------------------------------------------------------------------------------
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(compress.BeginCompressStringENC(sbIndex.GetAsString()));
    }
    else {
        sbCompressedBase64.Append(compress.MoreCompressStringENC(sbIndex.GetAsString()));
    }

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

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

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

//  Decompress in one call:
string originalText = compress.DecompressStringENC(sbCompressedBase64.GetAsString());
Debug.WriteLine(originalText);

//  ----------------------------------------------------------------------------------
//  This is new way of compressing in chunks using FirstChunk and LastChunk properties
//  ----------------------------------------------------------------------------------

sbCompressedBase64.Clear();

compress.FirstChunk = true;
compress.LastChunk = false;

Chilkat.BinData bdCompressed = new Chilkat.BinData();
Chilkat.StringBuilder sbUncompressedChunk = new Chilkat.StringBuilder();

for (i = 0; i <= 24; i++) {
    if (i == 24) {
        compress.LastChunk = true;
    }

    sbUncompressedChunk.Clear();
    sbUncompressedChunk.AppendInt(i);
    sbUncompressedChunk.Append(": This is a line of data to be compressed...\r\n");

    compress.CompressSb(sbUncompressedChunk,bdCompressed);

    compress.FirstChunk = false;
}

Debug.WriteLine("The base64 encoded compressed text:");
Debug.WriteLine(bdCompressed.GetEncoded("base64"));

//  Decompress in one call:
originalText = compress.DecompressStringENC(bdCompressed.GetEncoded("base64"));
Debug.WriteLine(originalText);