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Encoding an image in base64 [message #57546]

Sun, 19 September 2021 13:34

Giorgio
Messages: 218
Registered: August 2015

Experienced Member

Hi there,
I have a RichText field that contains some formatted text that I need to convert it to a base64 encoded PNG image.

I've been trying to use PNGEncoder and Encode64() with mixed results:

RichText text;

//text is filled in

ImagePainter w(3000, 100);
w.DrawRect(0, 0, 3000, 100, White());
text.Paint(w, 0, 0, 3000);

PNGEncoder png;
png.SaveFile("C:\\Temp\\richtext.png", w);

The above code works perfectly: I got a PNG image that can be viewed with any image viewer.

Anyway, I need the image to be encoded in base64, so I change the "png.SaveFile()" line above with the following:

String png_string = png.SaveString(w);
SaveFile("C:\\Temp\\test.txt",Encode64(png_string));

If I open the txt file, copy the content and paste it into an online base64 decoder (I tried a few) the image cannot be decoded.

What I do wrong?
Thankks,
gio

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