Perl

Unzip One File to a Stream

See more Zip Examples

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

use chilkat();

$success = 0;

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

$zip = chilkat::CkZip->new();

# First open a .zip.
$success = $zip->OpenZip("qa_data/hamlet.zip");
if ($success == 0) {
    print $zip->lastErrorText() . "\r\n";
    exit;
}

# Find the entry to be unzipped to a stream..
$entry = chilkat::CkZipEntry->new();
$success = $zip->EntryMatching("*hamlet.xml",$entry);
if ($success == 0) {
    print $zip->lastErrorText() . "\r\n";
    exit;
}

# 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.
$streamA = chilkat::CkStream->new();
$streamA->put_SinkFile("qa_output/hamletA.xml");

$success = $entry->UnzipToStream($streamA);
if ($success != 1) {
    print $entry->lastErrorText() . "\r\n";
    exit;
}

# Close the stream to close the output file.
$success = $streamA->WriteClose();

# ----------------------------------------------------------------
# Case 2a: Uzip to a stream asynchronously. 
$streamB = chilkat::CkStream->new();

# unzipTask is a Task
$unzipTask = $entry->UnzipToStreamAsync($streamB);
if ($entry->get_LastMethodSuccess() != 1) {
    print $entry->lastErrorText() . "\r\n";
    exit;
}

# Start the background unzip thread.
$unzipTask->Run();

# Read the stream.  (this is reading the unzipped file data)
$sb = chilkat::CkStringBuilder->new();
while ($streamB->get_EndOfStream() != 1) {
    # Each call to ReadSb appends to the contents of sb.
    $streamB->ReadSb($sb);
}

$sb->WriteFile("qa_output/hamletB.xml","utf-8",0);

print "Success." . "\r\n";

# ----------------------------------------------------------------
# Case 2b: Uzip to a stream asynchronously and emit output while reading. 
$streamC = chilkat::CkStream->new();

# unzipTask is a Task
$unzipTask = $entry->UnzipToStreamAsync($streamC);
if ($entry->get_LastMethodSuccess() != 1) {
    print $entry->lastErrorText() . "\r\n";
    exit;
}

$unzipTask->Run();

while ($streamC->get_EndOfStream() != 1) {
    $s = $streamC->readString();
    print $s . "\r\n";
}

print "Success." . "\r\n";