(Ruby) File Read Blocks

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

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require '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() != true)
        print facSrc.lastErrorText() + "\n";
        exit
    end

    success = facDest.FileWrite(dataBlock)
    if (success != true)
        print facDest.lastErrorText() + "\n";
        exit
    end

    i = i + 1
end

facSrc.FileClose()
facDest.FileClose()

bEqual = facSrc.FileContentsEqual(srcPath,destPath)
if (bEqual != true)
    print "Something went wrong!" + "\n";
    exit
end

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