Chilkat HOME .NET Core C# Android™ AutoIt C C# C++ Chilkat2-Python CkPython Classic ASP DataFlex Delphi ActiveX Delphi DLL Go Java Lianja Mono C# Node.js Objective-C PHP ActiveX PHP Extension Perl PowerBuilder PowerShell PureBasic Ruby SQL Server Swift 2 Swift 3,4,5... Tcl Unicode C Unicode C++ VB.NET VBScript Visual Basic 6.0 Visual FoxPro Xojo Plugin
(Unicode C) Streaming CompressionCompress and decompress using a stream.
#include <C_CkFileAccessW.h> #include <C_CkCompressionW.h> #include <C_CkStreamW.h> #include <C_CkTaskW.h> void ChilkatSample(void) { HCkFileAccessW fac; HCkCompressionW compress; HCkStreamW streamC; BOOL success; HCkStreamW streamD; BOOL bFilesEqual; HCkStreamW streamA; HCkTaskW task; const wchar_t *decompressedText; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. fac = CkFileAccessW_Create(); compress = CkCompressionW_Create(); CkCompressionW_putAlgorithm(compress,L"deflate"); streamC = CkStreamW_Create(); // This example sets the source and sink of the stream to files. // A stream can have use other streams as a source or sink, // or the application can itself be the source/sink by directly // reading or writing a stream. (See below for an example of this..) CkStreamW_putSourceFile(streamC,L"qa_data/hamlet.xml"); CkStreamW_putSinkFile(streamC,L"qa_output/hamlet_compressed.dat"); // Compress from source to sink. success = CkCompressionW_CompressStream(compress,streamC); if (success != TRUE) { wprintf(L"%s\n",CkCompressionW_lastErrorText(compress)); CkFileAccessW_Dispose(fac); CkCompressionW_Dispose(compress); CkStreamW_Dispose(streamC); return; } wprintf(L"File-to-file deflate compression successful.\n"); // Note: The FileSize method returns a signed 32-bit integer. If the file is potentially larger than 2GB, call FileSizeStr instead to return // the size of the file as a string, then convert to an integer value. wprintf(L"Original size = %d\n",CkFileAccessW_FileSize(fac,CkStreamW_sourceFile(streamC))); wprintf(L"Compressed size = %d\n",CkFileAccessW_FileSize(fac,CkStreamW_sinkFile(streamC))); // Now do file-to-file decompression streamD = CkStreamW_Create(); CkStreamW_putSourceFile(streamD,L"qa_output/hamlet_compressed.dat"); CkStreamW_putSinkFile(streamD,L"qa_output/hamlet_restored.xml"); // Decompress from source to sink. success = CkCompressionW_DecompressStream(compress,streamD); if (success != TRUE) { wprintf(L"%s\n",CkCompressionW_lastErrorText(compress)); CkFileAccessW_Dispose(fac); CkCompressionW_Dispose(compress); CkStreamW_Dispose(streamC); CkStreamW_Dispose(streamD); return; } wprintf(L"File-to-file deflate decompression successful.\n"); // Let's double-check to see that the files are equal in size and content: bFilesEqual = CkFileAccessW_FileContentsEqual(fac,CkStreamW_sourceFile(streamC),CkStreamW_sinkFile(streamD)); if (bFilesEqual != TRUE) { wprintf(L"The output file is not equal to the input file!\n"); } else { wprintf(L"The file was successfully compressed and decompressed.\n"); } // --------------------------------------------------------------------- // Now let's decompress again, but this time w/ the application reading // the decompressed data directly from a stream. streamA = CkStreamW_Create(); CkStreamW_putSourceFile(streamA,L"qa_output/hamlet_compressed.dat"); // Start decompressing in a background thread. task = CkCompressionW_DecompressStreamAsync(compress,streamA); success = CkTaskW_Run(task); // Read decompressed data from streamA: while ((CkStreamW_getEndOfStream(streamA) != TRUE)) { if (CkStreamW_getDataAvailable(streamA) == TRUE) { decompressedText = CkStreamW_readString(streamA); wprintf(L"%s\n",decompressedText); } } // Let's make sure the background task finished and that the decompress was successful. // It should already be the case that the task is finished. while ((CkTaskW_getFinished(task) != TRUE)) { CkTaskW_SleepMs(task,20); } // The decompressor may have finished, but it is possible that data // remains to be flushed. if (CkStreamW_getDataAvailable(streamA) == TRUE) { decompressedText = CkStreamW_readString(streamA); wprintf(L"%s\n",decompressedText); } // Did streamA succeed in reading the entire file? if (CkTaskW_getTaskSuccess(task) != TRUE) { wprintf(L"async decompress failed:\n"); wprintf(L"%s\n",CkTaskW_resultErrorText(task)); success = FALSE; } wprintf(L"The async decompress was successful.\n"); CkFileAccessW_Dispose(fac); CkCompressionW_Dispose(compress); CkStreamW_Dispose(streamC); CkStreamW_Dispose(streamD); CkStreamW_Dispose(streamA); } |
© 2000-2024 Chilkat Software, Inc. All Rights Reserved.