(MFC) Extract PDF from JSON

Demonstrates how to extract a PDF file contained within JSON. The file is represented as a base64 string within the JSON. Note: This example can extract any type of file, not just a PDF file.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkJsonObject.h>
#include <CkStringBuilder.h>
#include <CkBinData.h>

void ChilkatSample(void)
    {
    CkString strOut;

    CkJsonObject json;

    // Load the JSON.
    bool success = json.LoadFile("qa_data/json/JSR5U.json");
    if (success != true) {
        strOut.append(json.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // The JSON we loaded contains this:

    // 	{
    // 	...
    // 	...
    // 	  "data": {
    // 	    "content": "JVBERi0xLjQ..."
    // 	  }
    // 	...
    // 	...
    // 	}

    CkStringBuilder sb;
    json.StringOfSb("data.content",sb);

    CkBinData bd;
    bd.AppendEncodedSb(sb,"base64");

    success = bd.WriteFile("qa_output/a0015.pdf");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }