Update Image signatures in document Leave feedback

GroupDocs.Signature provides ImageSignature class to manipulate barcode signatures location, size 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 Barcode signature in the document with GroupDocs.Signature:

• Create new instance of Signature class and pass source document path as a constructor parameter;
• Instantiate ImageSearchOptions object with desired properties;
• Call Search method to obtain list of ImageSignatures;
• Select from list ImageSignature 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 Image signature that was found using  Search method.

using (Signature signature = new Signature("sampleSigned.pdf"))
{
    ImageSearchOptions options = new ImageSearchOptions();
    // search for image signatures in document
    List<ImageSignature> signatures = signature.Search<ImageSignature>(options);
    if(signatures.Count > 0)
    {
        ImageSignature imageSignature = signatures[0];
        // change Image properties
        signatureToUpdate.Top = 200;
        signatureToUpdate.Left = 200;
        signatureToUpdate.Width = 300;
        signatureToUpdate.Height = 150;

        bool result = signature.Update(imageSignature);
        if (result)
        {
            Console.WriteLine(
                $"Signature with Top '{imageSignature.Top}' " +
                $"was updated in the document ['{fileName}']."
            );
        }
        else
        {
            Console.WriteLine(
                $"Signature was not updated in the document! " +
                $"Signature with Top '{imageSignature.Top}' was not found!"
            );
        }
    }
}

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 image signatures and/or sign your files with them for free, you can use the Generate Image 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.