(MFC) Read/Write JSON with Binary Data such as JPEG Files

Demonstrates how binary files could be stored in JSON in base64 format. Creates JSON containing the contents of a JPG file, and then reads the JSON to extract the JPEG image.

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

See Also: Using MFC CString in Chilkat

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

void ChilkatSample(void)
    {
    CkString strOut;

    // First load a small JPG file..
    CkBinData bd;

    bool success = bd.LoadFile("qa_data/jpg/starfish20.jpg");
    // Assume success, but your code should check for success..

    // Create JSON containing the binary data in base64 format.
    CkJsonObject json1;
    json1.UpdateBd("starfish","base64",bd);

    const char *jsonStr = json1.emit();
    strOut.append(jsonStr);
    strOut.append("\r\n");

    // Here's the output:
    // {"starfish":"/9j/4AAQSkZJRgA ... cN2iuLFsCEbDGxQkI6RO/n//2Q=="}

    // Let's create a new JSON object, load it with the above JSON, and extract the JPG image..
    CkJsonObject json2;
    json2.Load(jsonStr);

    // Get the binary bytes.
    CkBinData bd2;
    json2.BytesOf("starfish","base64",bd2);

    // Save to a file.
    success = bd2.WriteFile("qa_output/starfish20.jpg");

    strOut.append("Success.");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }