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(Unicode C) Decode Base64 Image String (GIF, JPG, etc.) and Save to FileI have an XML response that includes a base 64 encoded image string (UPS label). It's a huge string and I need to save it as a gif file on my users pc. This example shows how to do it..
#include <C_CkBinDataW.h> #include <C_CkXmlW.h> void ChilkatSample(void) { HCkBinDataW bd; BOOL success; const wchar_t *x; HCkXmlW xml; const wchar_t *gifBase64; bd = CkBinDataW_Create(); // I created an extra-small GIF image for this example.. success = CkBinDataW_LoadFile(bd,L"qa_data/gif/xsmall.gif"); if (success != TRUE) { wprintf(L"Failed to load GIF image file.\n"); CkBinDataW_Dispose(bd); return; } // Show GIF bytes as base64: wprintf(L"%s\n",CkBinDataW_getEncoded(bd,L"base64")); // This particular GIF in base64 is this: // R0lGODlhBQAFAMQAAAAAAP////z8/PHx8evr6+jo6OHh4d7e3sPDw8LCwpqamo2NjWxsbGRkZFpaWk1NTUtLS0hISCwsLCQkJP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAABQALAAAAAAFAAUAAAUTYCAYQUBAU1lI0TIgztE8jFImIQA7 // Let's begin with an XML string: x = L"<abc><def>R0lGODlhBQAFAMQAAAAAAP////z8/PHx8evr6+jo6OHh4d7e3sPDw8LCwpqamo2NjWxsbGRkZFpaWk1NTUtLS0hISCwsLCQkJP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAABQALAAAAAAFAAUAAAUTYCAYQUBAU1lI0TIgztE8jFImIQA7</def></abc>"; xml = CkXmlW_Create(); success = CkXmlW_LoadXml(xml,x); // Get the base64 string: gifBase64 = CkXmlW_getChildContent(xml,L"def"); wprintf(L"%s\n",gifBase64); // Load bd with the base64 decoded bytes. CkBinDataW_Clear(bd); CkBinDataW_AppendEncoded(bd,gifBase64,L"base64"); // Save to a GIF file. success = CkBinDataW_WriteFile(bd,L"qa_output/xsmall.gif"); CkBinDataW_Dispose(bd); CkXmlW_Dispose(xml); } |
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