.NET Core C# Requires Chilkat v11.7.0+

Generate a QR Code PNG in Memory

See more QR Code Examples

Demonstrates getting a QR code image without writing a file. With no output options the result is a PNG returned as base64 in outputs[0].base64 of the response. The example decodes it into a BinData, which holds the bytes of the PNG to send in an HTTP response, store in a database, attach to an email, or save. .NET Core C#

bool success = false;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.UpdateString("payload.text","https://www.chilkatsoft.com/");
json.UpdateInt("render.moduleSize",6);

Chilkat.Formats fmt = new Chilkat.Formats();
Chilkat.JsonObject jsonOut = new Chilkat.JsonObject();
success = fmt.QrCode("generate",json,jsonOut);
if (success == false) {
    Debug.WriteLine(fmt.LastErrorText);
    return;
}

Debug.WriteLine("format: " + jsonOut.StringOf("outputs[0].format"));
Debug.WriteLine("MIME type: " + jsonOut.StringOf("outputs[0].mimeType"));
Debug.WriteLine("image: " + Convert.ToString(jsonOut.IntOf("outputs[0].width")) + " x " + Convert.ToString(jsonOut.IntOf("outputs[0].height")) + " pixels");

//  outputs[0].base64 is the PNG file, base64 encoded.
Chilkat.BinData bdPng = new Chilkat.BinData();
success = bdPng.AppendEncoded(jsonOut.StringOf("outputs[0].base64"),"base64");
if (success == false) {
    Debug.WriteLine(bdPng.LastErrorText);
    return;
}

Debug.WriteLine("PNG bytes: " + Convert.ToString(bdPng.NumBytes));

//  The BinData holds the image.  Here it is simply saved.
success = bdPng.WriteFile("qa_output/qr_in_memory.png");
if (success == false) {
    Debug.WriteLine(bdPng.LastErrorText);
    return;
}

//  The PNG held in bdPng:

//  

//  Sample output:

//  format: png
//  MIME type: image/png
//  image: 222 x 222 pixels
//  PNG bytes: 877