(MFC) Extract data:image/png;base64 from HTML

Demonstrates how to extract base64 image data from HTMl and save to files..

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

See Also: Using MFC CString in Chilkat

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

void ChilkatSample(void)
    {
    CkString strOut;

    CkStringBuilder sb;
    CkBinData bd;
    CkStringBuilder sbFilename;
    int index = 1;

    bool success = sb.LoadFile("qa_data/html/oresp body.txt","utf-8");
    // Assume success.
    strOut.append("length = ");
    strOut.appendInt(sb.get_Length());
    strOut.append("\r\n");

    bool mayHaveMore = true;
    while (mayHaveMore == true) {

        // Get the base64 between the 1st occurrence "data:image/png;base64," and "'"
        const char *sBase64 = sb.getBetween("data:image/png;base64,","'");

        // If nothing is found, then we'll exit the loop because there are no more.
        mayHaveMore = sb.get_LastMethodSuccess();

        if (sb.get_LastMethodSuccess() == true) {
            // Found something.
            // Load into bd and save.
            success = bd.LoadEncoded(sBase64,"base64");

            sbFilename.SetString("qa_output/png_");
            sbFilename.AppendInt(index);
            sbFilename.Append(".png");

            bd.WriteFile(sbFilename.getAsString());

            // Replace "data:image/png;base64" with "data:image-png;base64" so the next iteration finds the next occurrence.
            sb.ReplaceFirst("data:image/png;base64","data:image-png;base64");
        }

        index = index + 1;
    }

    // Restore our replacements..
    int count = sb.Replace("data:image-png;base64","data:image/png;base64");

    strOut.append("All done.");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }