Unicode C

Decode Base64 Image String (GIF, JPG, etc.) and Save to File

I 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..

Unicode C

#include <C_CkBinDataW.h>
#include <C_CkXmlW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkBinDataW bd;
    const wchar_t *x;
    HCkXmlW xml;
    const wchar_t *gifBase64;

    success = FALSE;

    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);

    }