PPMD Compress File

Demonstrates how to use the PPMD compression algorithm to compress a file. This code is capable of compressing any size file because the file data is compressed from input to output in a streaming mode. The output file does not contain any "PPMD" header -- it is purely PPMD compressed data.

The functionality in this example is available in pre-release only:
To use, unzip and add a reference to the enclosed DLL in your .NET project.

Download Chilkat .NET for 2.0 / 3.5 Framework

Download Chilkat .NET for 1.0 / 1.1 Framework

Chilkat.Compression compress = new Chilkat.Compression();

//  Any string argument automatically begins a 30-day trial.
bool success;
success = compress.UnlockComponent("30-day trial");
if (success != true) {
    MessageBox.Show("Compression component unlock failed");
    return;
}

compress.Algorithm = "ppmd";

success = compress.CompressFile("hamlet.xml","hamletPpmd.dat");
if (success != true) {
    MessageBox.Show(compress.LastErrorText);
    return;
}

//  Decompress back to the original:
success = compress.DecompressFile("hamletPpmd.dat","hamletInflated.xml");
if (success != true) {
    MessageBox.Show(compress.LastErrorText);
    return;
}

textBox1.Text += "Success!" + "\r\n";