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(Go) Compress Large Binary File in BlocksCompresses a large binary file in blocks. Note: This example requires Chilkat v11.0.0 or greater.
success := false // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. facSrc := FileAccess_Ref.html">chilkat.NewFileAccess() facDest := FileAccess_Ref.html">chilkat.NewFileAccess() // Open a large binary file for reading. success = facSrc.OpenForRead("qa_data/bmp/big.bmp") if success == false { fmt.Println(facSrc.LastErrorText()) facSrc.DisposeFileAccess() facDest.DisposeFileAccess() return } // If we compress in 64K chunks, find out how many blocks there will be. blockSize := 65536 numBlocks := facSrc.GetNumBlocks(blockSize) // Open an output file for the compressed data. success = facDest.OpenForWrite("c:/temp/qa_output/compressedBmp.dat") if success == false { fmt.Println(facDest.LastErrorText()) facSrc.DisposeFileAccess() facDest.DisposeFileAccess() return } compress := Compression_Ref.html">chilkat.NewCompression() compress.SetAlgorithm("deflate") var fileBytes []byte var compressedBytes []byte // Assuming numBlocks > 1 compress.SetFirstChunk(true) compress.SetLastChunk(false) i := 0 for i < numBlocks { fileBytes = facSrc.ReadBlock(i,blockSize) compressedBytes = compress.CompressBytes(fileBytes) facDest.FileWrite(compressedBytes) i = i + 1 compress.SetFirstChunk(false) if i == (numBlocks - 1) { compress.SetLastChunk(true) } } facSrc.FileClose() facDest.FileClose() fmt.Println("Finished compressing file.") facSrc.DisposeFileAccess() facDest.DisposeFileAccess() compress.DisposeCompression() |
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