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Perl Examples

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(Perl) File Read Blocks

Demonstrates how to read a file in fixed-size blocks (except for the very last block).

Chilkat Perl Downloads

Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

# Demonstrates how to read a file in blocks,
# which can be useful when uploading to cloud storage
# services such as Azure, S3, Google, etc.

# For this example, we're simply writing the blocks
# to an output file, and then checking to see if the
# resulting file contents equals the original file contents.

$dataBlock = chilkat::CkByteData->new();

$facSrc = chilkat::CkFileAccess->new();
$facDest = chilkat::CkFileAccess->new();

$srcPath = "qa_data/xml/hamlet.xml";
$destPath = "qa_output/hamletOut.xml";

$success = $facSrc->OpenForRead($srcPath);
$success = $facDest->OpenForWrite($destPath);
# Assuming success for the example..

# How many 1024-byte blocks?  (Including 1 for the last partial block)
$numBlocks = $facSrc->GetNumBlocks(1024);

$i = 0;
while (($i < $numBlocks)) {
    $success = $facSrc->ReadBlock($i,1024,$dataBlock);
    if ($facSrc->get_LastMethodSuccess() != 1) {
        print $facSrc->lastErrorText() . "\r\n";
        exit;
    }

    $success = $facDest->FileWrite($dataBlock);
    if ($success != 1) {
        print $facDest->lastErrorText() . "\r\n";
        exit;
    }

    $i = $i + 1;
}

$facSrc->FileClose();
$facDest->FileClose();

$bEqual = $facSrc->FileContentsEqual($srcPath,$destPath);
if ($bEqual != 1) {
    print "Something went wrong!" . "\r\n";
    exit;
}

print "File successfully copied by blocks." . "\r\n";

 

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