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(Node.js) Compress String Feed to Base64This 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.
var os = require('os'); if (os.platform() == 'win32') { if (os.arch() == 'ia32') { var chilkat = require('@chilkat/ck-node11-win-ia32'); } else { var chilkat = require('@chilkat/ck-node11-win64'); } } else if (os.platform() == 'linux') { if (os.arch() == 'arm') { var chilkat = require('@chilkat/ck-node11-arm'); } else if (os.arch() == 'x86') { var chilkat = require('@chilkat/ck-node11-linux32'); } else { var chilkat = require('@chilkat/ck-node11-linux64'); } } else if (os.platform() == 'darwin') { var chilkat = require('@chilkat/ck-node11-macosx'); } function chilkatExample() { // This example requires the Chilkat API to have been previously unlocked. // See Compression UnlockComponent for sample code. var success; var sbCompressedBase64 = new chilkat.StringBuilder(); var compress = new chilkat.Compression(); compress.Algorithm = "deflate"; compress.Charset = "utf-8"; compress.EncodingMode = "base64"; var sbIndex = new chilkat.StringBuilder(); var 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()); console.log("The base64 encoded compressed text:"); console.log(sbCompressedBase64.GetAsString()); // Now decompress in one call: var originalText = compress.DecompressStringENC(sbCompressedBase64.GetAsString()); console.log(originalText); } chilkatExample(); |
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