Update QR-code signatures in document Leave feedback

GroupDocs.Signature provides QrCodeSignature class to manipulate QR-code signatures location, size, encode type and textual content. Please be aware that Update method modifies the same document that was passed to constructor of Signature class.

Here are the steps to update QR-code signature in the document with GroupDocs.Signature:

• Create new instance of Signature class and pass source document path as a constructor parameter;
• Instantiate QrCodeSearchOptions object with desired properties;
• Call Search method to obtain list of QrCodeSignatures;
• Select from list QrCodeSignature object(s) that should be updated;
• Call Signature object Update method and pass one or several signatures to it.

This example shows how to update QR-code signature that was found using  Search method.

// initialize Signature instance
using (Signature signature = new Signature("signed.pdf"))
{
    QrCodeSearchOptions options = new QrCodeSearchOptions();
    // search for QRCode signatures in document
    List<QrCodeSignature> signatures = signature.Search<QrCodeSignature>(options);
    if (signatures.Count > 0)
    {
        QrCodeSignature qrCodeSignature = signatures[0];
        // change position
        qrCodeSignature.Left = 100;
        qrCodeSignature.Top = 100;
        bool result = signature.Update(qrCodeSignature);
        if (result)
        {
            Console.WriteLine(
                $"Signature with QR-Code '{qrCodeSignature.Text}' " +
                $"was updated in the document."
            );
        }
        else
        {
            Console.WriteLine("Signature was not deleted from the document!");
        }
    }
}

To learn more about document eSign features, please refer to the advanced usage section.

You may easily run the code above and see the feature in action in our GitHub examples:

• GroupDocs.Signature for .NET examples, plugins, and showcase
• GroupDocs.Signature for Java examples, plugins, and showcase
• Document Signature for .NET MVC UI Example
• Document Signature for .NET App WebForms UI Example
• Document Signature for Java App Dropwizard UI Example
• Document Signature for Java Spring UI Example

Along with the full-featured .NET library, we provide simple but powerful free online apps.

To generate QR codes and/or sign your files with QR codes for free, you can use the QR Code Generator online app.

To sign PDF, Word, Excel, PowerPoint, and other documents you can use the other online apps from the GroupDocs.Signature App Product Family.