![]() |
Chilkat HOME Android™ AutoIt C C# C++ Chilkat2-Python CkPython Classic ASP DataFlex Delphi DLL Go Java Node.js Objective-C PHP Extension Perl PowerBuilder PowerShell PureBasic Ruby SQL Server Swift Tcl Unicode C Unicode C++ VB.NET VBScript Visual Basic 6.0 Visual FoxPro Xojo Plugin
(Unicode C) Decompress Large Binary File in BlocksDecompresses a large binary file in blocks. Note: This example requires Chilkat v11.0.0 or greater.
#include <C_CkFileAccessW.h> #include <C_CkCompressionW.h> #include <C_CkByteData.h> void ChilkatSample(void) { BOOL success; HCkFileAccessW facSrc; HCkFileAccessW facDest; int blockSize; int numBlocks; HCkCompressionW compress; HCkByteData decompressedBytes; HCkByteData compressedBytes; int i; success = FALSE; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. facSrc = CkFileAccessW_Create(); facDest = CkFileAccessW_Create(); // Open a previously compressed file for decompressing. // See Compress Large File in Blocks success = CkFileAccessW_OpenForRead(facSrc,L"c:/temp/qa_output/compressedBmp.dat"); if (success == FALSE) { wprintf(L"%s\n",CkFileAccessW_lastErrorText(facSrc)); CkFileAccessW_Dispose(facSrc); CkFileAccessW_Dispose(facDest); return; } // If we compress in 32K chunks, find out how many blocks there will be. blockSize = 32768; numBlocks = CkFileAccessW_GetNumBlocks(facSrc,blockSize); // Open an output file for the decompressed data. success = CkFileAccessW_OpenForWrite(facDest,L"c:/temp/qa_output/decompressed.bmp"); if (success == FALSE) { wprintf(L"%s\n",CkFileAccessW_lastErrorText(facDest)); CkFileAccessW_Dispose(facSrc); CkFileAccessW_Dispose(facDest); return; } compress = CkCompressionW_Create(); CkCompressionW_putAlgorithm(compress,L"deflate"); decompressedBytes = CkByteData_Create(); compressedBytes = CkByteData_Create(); // Assuming numBlocks > 1 CkCompressionW_putFirstChunk(compress,TRUE); CkCompressionW_putLastChunk(compress,FALSE); i = 0; while (i < numBlocks) { success = CkFileAccessW_ReadBlock(facSrc,i,blockSize,compressedBytes); success = CkCompressionW_DecompressBytes(compress,compressedBytes,decompressedBytes); CkFileAccessW_FileWrite(facDest,decompressedBytes); i = i + 1; CkCompressionW_putFirstChunk(compress,FALSE); if (i == (numBlocks - 1)) { CkCompressionW_putLastChunk(compress,TRUE); } } CkFileAccessW_FileClose(facSrc); CkFileAccessW_FileClose(facDest); wprintf(L"Finished decompressing file.\n"); CkFileAccessW_Dispose(facSrc); CkFileAccessW_Dispose(facDest); CkCompressionW_Dispose(compress); CkByteData_Dispose(decompressedBytes); CkByteData_Dispose(compressedBytes); } |
© 2000-2025 Chilkat Software, Inc. All Rights Reserved.