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(C#) Compress Large Binary File in BlocksCompresses a large binary file in blocks. This example uses BeginCompressBytes, MoreCompressBytes, and EndCompressBytes.
// This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.FileAccess facSrc = new Chilkat.FileAccess(); Chilkat.FileAccess facDest = new Chilkat.FileAccess(); // Open a large binary file for reading. bool success = facSrc.OpenForRead("qa_data/bmp/big.bmp"); if (success != true) { Debug.WriteLine(facSrc.LastErrorText); return; } // If we compress in 64K chunks, find out how many blocks there will be. int blockSize = 65536; int numBlocks = facSrc.GetNumBlocks(blockSize); // Open an output file for the compressed data. success = facDest.OpenForWrite("qa_data/bmp/compressedBmp.dat"); if (success != true) { Debug.WriteLine(facDest.LastErrorText); return; } Chilkat.Compression compress = new Chilkat.Compression(); compress.Algorithm = "deflate"; byte[] fileBytes = null; byte[] compressedBytes = null; int i = 0; while (i < numBlocks) { fileBytes = facSrc.ReadBlock(i,blockSize); if (i == 0) { compressedBytes = compress.BeginCompressBytes(fileBytes); } else { compressedBytes = compress.MoreCompressBytes(fileBytes); } facDest.FileWrite(compressedBytes); i = i + 1; } // At the very end, flush any remaining compressed bytes, if any. compressedBytes = compress.EndCompressBytes(); facDest.FileWrite(compressedBytes); facSrc.FileClose(); facDest.FileClose(); Debug.WriteLine("Finished compressing file."); |
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