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(Unicode C) Compress and Decompress Base64Imagine we have data represented as a base64 string. This example demonstrates how to decode, compress, and re-encode to smaller base64 representing the compressed data. Note: This example requires Chilkat v9.5.0.66 or greater.
#include <C_CkCompressionW.h> #include <C_CkBinDataW.h> void ChilkatSample(void) { BOOL success; const wchar_t *strBase64; HCkCompressionW compress; HCkBinDataW binDat; const wchar_t *compressedBase64; const wchar_t *decompressedBase64; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. strBase64 = L"VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2cuDQpUaGUgcXVpY2sgYnJvd24gZm94IGp1bXBlZCBvdmVyIHRoZSBsYXp5IGRvZy4NClRoZSBxdWljayBicm93biBmb3gganVtcGVkIG92ZXIgdGhlIGxhenkgZG9nLg0KVGhlIHF1aWNrIGJyb3duIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2cuDQpUaGUgcXVpY2sgYnJvd24gZm94IGp1bXBlZCBvdmVyIHRoZSBsYXp5IGRvZy4NCg0K"; compress = CkCompressionW_Create(); CkCompressionW_putAlgorithm(compress,L"deflate"); binDat = CkBinDataW_Create(); // Load the base64 data into a BinData object. // This decodes the base64. The decoded bytes will be contained in the BinData. CkBinDataW_AppendEncoded(binDat,strBase64,L"base64"); // Compress the BinData. CkCompressionW_CompressBd(compress,binDat); // Get the compressed data in base64 format: compressedBase64 = CkBinDataW_getEncoded(binDat,L"base64"); wprintf(L"compressed base64:\n"); wprintf(L"%s\n",compressedBase64); // The compressed base64 is: C8lIVSgszUzOVkgqyi/PU0jLr1DIKs0tSE1RyC9LLVIoAcrnJFZVKqTkp+vxcoUMYeW8XAA= // Now decompress: CkBinDataW_Clear(binDat); CkBinDataW_AppendEncoded(binDat,compressedBase64,L"base64"); CkCompressionW_DecompressBd(compress,binDat); decompressedBase64 = CkBinDataW_getEncoded(binDat,L"base64"); wprintf(L"decompressed base64:\n"); wprintf(L"%s\n",decompressedBase64); // The output is the original data: // VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2cuDQpUaGUgcXVpY2sgYnJvd24gZm94IGp1bXBlZCBvdmVyIHRoZSBsYXp5IGRvZy4NClRoZSBxdWljayBicm93biBmb3gganVtcGVkIG92ZXIgdGhlIGxhenkgZG9nLg0KVGhlIHF1aWNrIGJyb3duIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2cuDQpUaGUgcXVpY2sgYnJvd24gZm94IGp1bXBlZCBvdmVyIHRoZSBsYXp5IGRvZy4NCg0K CkCompressionW_Dispose(compress); CkBinDataW_Dispose(binDat); } |
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