Update QR-code signatures in document

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
Signature signature = new Signature("signed.pdf");
 
try
{
    QrCodeSearchOptions options = new QrCodeSearchOptions();
    // search for QRCode signatures in document
    List<QrCodeSignature> signatures = signature.search(QrCodeSignature.class, options);
    if (signatures.size() > 0)
    {
        QrCodeSignature qrCodeSignature = signatures.get(0);
        qrCodeSignature.setLeft(10);
        qrCodeSignature.setTop(10);
        boolean result = signature.update("signed-output.pdf", qrCodeSignature);
        if (result)
        {
            System.out.print("Signature with QR-Code '"+qrCodeSignature.getText()+"' and encode type '"+qrCodeSignature.getEncodeType().getTypeName()+"' was deleted from document ['signed-output.pdf'].");
        }
        else
        {
            System.out.print("Signature was not deleted from the document! Signature with Barcode '"+qrCodeSignature.getText()+"' and encode type '"+qrCodeSignature.getEncodeType().getTypeName()+"' was not found!");
        }
    }
} catch (Exception e) {
    throw new GroupDocsSignatureException(e.getMessage());
}

More resources

Advanced Usage Topics

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

GitHub Examples

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

Free Online App

Along with full-featured .NET library we provide simple, but powerful free Apps.
You are welcome to eSign PDF, Word, Excel, PowerPoint documents with free to use online GroupDocs Signature App.

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