C#

Unzip One File to a Stream

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Demonstrates how to unzip a particular file contained within a .zip archive to a Chilkat stream. C#

bool success = false;

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

Chilkat.Zip zip = new Chilkat.Zip();

// First open a .zip.
success = zip.OpenZip("qa_data/hamlet.zip");
if (success == false) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

// Find the entry to be unzipped to a stream..
Chilkat.ZipEntry entry = new Chilkat.ZipEntry();
success = zip.EntryMatching("*hamlet.xml",entry);
if (success == false) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

// There are three ways we can unzip (inflate) to a stream.
// 
// 1) Set a sink file on the stream object and call UnzipToStream synchronously.
//    This unzips to the stream's sink (which is to simply unzip to a file in the filesystem).
// 
// 2) Create a stream object and call UnzipToStreamAsync.  This starts the unzip in a background
//    thread (after Task.Run is called).  Your application can then read the unzipped (inflated) file
//    directly from the stream.
// 
// 3) (not shown in this example) Unzip to a stream object that is the source of something else.
//    

// ----------------------------------------------------------------
// Case 1: Unzip to a file by setting the sink of streamA to a file.
Chilkat.Stream streamA = new Chilkat.Stream();
streamA.SinkFile = "qa_output/hamletA.xml";

success = entry.UnzipToStream(streamA);
if (success != true) {
    Debug.WriteLine(entry.LastErrorText);
    return;
}

// Close the stream to close the output file.
success = streamA.WriteClose();

// ----------------------------------------------------------------
// Case 2a: Uzip to a stream asynchronously. 
Chilkat.Stream streamB = new Chilkat.Stream();

Chilkat.Task unzipTask = entry.UnzipToStreamAsync(streamB);
if (entry.LastMethodSuccess != true) {
    Debug.WriteLine(entry.LastErrorText);
    return;
}

// Start the background unzip thread.
unzipTask.Run();

// Read the stream.  (this is reading the unzipped file data)
Chilkat.StringBuilder sb = new Chilkat.StringBuilder();
while (streamB.EndOfStream != true) {
    // Each call to ReadSb appends to the contents of sb.
    streamB.ReadSb(sb);
}

sb.WriteFile("qa_output/hamletB.xml","utf-8",false);

Debug.WriteLine("Success.");

// ----------------------------------------------------------------
// Case 2b: Uzip to a stream asynchronously and emit output while reading. 
Chilkat.Stream streamC = new Chilkat.Stream();

unzipTask = entry.UnzipToStreamAsync(streamC);
if (entry.LastMethodSuccess != true) {
    Debug.WriteLine(entry.LastErrorText);
    return;
}

unzipTask.Run();

while (streamC.EndOfStream != true) {
    string s = streamC.ReadString();
    Debug.WriteLine(s);
}

Debug.WriteLine("Success.");