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(Tcl) Compress Large Binary File in BlocksCompresses a large binary file in blocks. Note: This example requires Chilkat v11.0.0 or greater.
load ./chilkat.dll set success 0 # This example assumes the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. set facSrc [new_CkFileAccess] set facDest [new_CkFileAccess] # Open a large binary file for reading. set success [CkFileAccess_OpenForRead $facSrc "qa_data/bmp/big.bmp"] if {$success == 0} then { puts [CkFileAccess_lastErrorText $facSrc] delete_CkFileAccess $facSrc delete_CkFileAccess $facDest exit } # If we compress in 64K chunks, find out how many blocks there will be. set blockSize 65536 set numBlocks [CkFileAccess_GetNumBlocks $facSrc $blockSize] # Open an output file for the compressed data. set success [CkFileAccess_OpenForWrite $facDest "c:/temp/qa_output/compressedBmp.dat"] if {$success == 0} then { puts [CkFileAccess_lastErrorText $facDest] delete_CkFileAccess $facSrc delete_CkFileAccess $facDest exit } set compress [new_CkCompression] CkCompression_put_Algorithm $compress "deflate" set fileBytes [new_CkByteData] set compressedBytes [new_CkByteData] # Assuming numBlocks > 1 CkCompression_put_FirstChunk $compress 1 CkCompression_put_LastChunk $compress 0 set i 0 while {$i < $numBlocks} { set success [CkFileAccess_ReadBlock $facSrc $i $blockSize $fileBytes] set success [CkCompression_CompressBytes $compress $fileBytes $compressedBytes] CkFileAccess_FileWrite $facDest $compressedBytes set i [expr $i + 1] CkCompression_put_FirstChunk $compress 0 if {$i == [expr $numBlocks - 1]} then { CkCompression_put_LastChunk $compress 1 } } CkFileAccess_FileClose $facSrc CkFileAccess_FileClose $facDest puts "Finished compressing file." delete_CkFileAccess $facSrc delete_CkFileAccess $facDest delete_CkCompression $compress delete_CkByteData $fileBytes delete_CkByteData $compressedBytes |
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