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(Unicode C) Compress Large Binary File in BlocksCompresses a large binary file in blocks. This example uses BeginCompressBytes, MoreCompressBytes, and EndCompressBytes.
#include <C_CkFileAccessW.h> #include <C_CkCompressionW.h> #include <C_CkByteData.h> void ChilkatSample(void) { HCkFileAccessW facSrc; HCkFileAccessW facDest; BOOL success; int blockSize; int numBlocks; HCkCompressionW compress; HCkByteData fileBytes; HCkByteData compressedBytes; int i; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. facSrc = CkFileAccessW_Create(); facDest = CkFileAccessW_Create(); // Open a large binary file for reading. success = CkFileAccessW_OpenForRead(facSrc,L"qa_data/bmp/big.bmp"); if (success != TRUE) { wprintf(L"%s\n",CkFileAccessW_lastErrorText(facSrc)); CkFileAccessW_Dispose(facSrc); CkFileAccessW_Dispose(facDest); return; } // If we compress in 64K chunks, find out how many blocks there will be. blockSize = 65536; numBlocks = CkFileAccessW_GetNumBlocks(facSrc,blockSize); // Open an output file for the compressed data. success = CkFileAccessW_OpenForWrite(facDest,L"qa_data/bmp/compressedBmp.dat"); if (success != TRUE) { wprintf(L"%s\n",CkFileAccessW_lastErrorText(facDest)); CkFileAccessW_Dispose(facSrc); CkFileAccessW_Dispose(facDest); return; } compress = CkCompressionW_Create(); CkCompressionW_putAlgorithm(compress,L"deflate"); fileBytes = CkByteData_Create(); compressedBytes = CkByteData_Create(); i = 0; while (i < numBlocks) { success = CkFileAccessW_ReadBlock(facSrc,i,blockSize,fileBytes); if (i == 0) { success = CkCompressionW_BeginCompressBytes(compress,fileBytes,compressedBytes); } else { success = CkCompressionW_MoreCompressBytes(compress,fileBytes,compressedBytes); } CkFileAccessW_FileWrite(facDest,compressedBytes); i = i + 1; } // At the very end, flush any remaining compressed bytes, if any. success = CkCompressionW_EndCompressBytes(compress,compressedBytes); CkFileAccessW_FileWrite(facDest,compressedBytes); CkFileAccessW_FileClose(facSrc); CkFileAccessW_FileClose(facDest); wprintf(L"Finished compressing file.\n"); CkFileAccessW_Dispose(facSrc); CkFileAccessW_Dispose(facDest); CkCompressionW_Dispose(compress); CkByteData_Dispose(fileBytes); CkByteData_Dispose(compressedBytes); } |
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