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(Xojo Plugin) Decompress Large Binary File in BlocksDecompresses a large binary file in blocks. Note: This example requires Chilkat v11.0.0 or greater.
Dim success As Boolean success = False // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Dim facSrc As New Chilkat.FileAccess Dim facDest As New Chilkat.FileAccess // Open a previously compressed file for decompressing. // See Compress Large File in Blocks success = facSrc.OpenForRead("c:/temp/qa_output/compressedBmp.dat") If (success = False) Then System.DebugLog(facSrc.LastErrorText) Return End If // If we compress in 32K chunks, find out how many blocks there will be. Dim blockSize As Int32 blockSize = 32768 Dim numBlocks As Int32 numBlocks = facSrc.GetNumBlocks(blockSize) // Open an output file for the decompressed data. success = facDest.OpenForWrite("c:/temp/qa_output/decompressed.bmp") If (success = False) Then System.DebugLog(facDest.LastErrorText) Return End If Dim compress As New Chilkat.Compression compress.Algorithm = "deflate" Dim decompressedBytes As MemoryBlock Dim compressedBytes As MemoryBlock // Assuming numBlocks > 1 compress.FirstChunk = True compress.LastChunk = False Dim i As Int32 i = 0 While i < numBlocks compressedBytes = facSrc.ReadBlock(i,blockSize) decompressedBytes = compress.DecompressBytes(compressedBytes) success = facDest.FileWrite(decompressedBytes) i = i + 1 compress.FirstChunk = False If (i = (numBlocks - 1)) Then compress.LastChunk = True End If Wend facSrc.FileClose facDest.FileClose System.DebugLog("Finished decompressing file.") |
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