Subscribing for verification process events Leave feedback
Signature class contains several events that are being called for different verification process stages
- VerifyStarted to handle process start event. This event is occur once verify method is called
- VerifyProgress to handle progress event. This event occurs each time on verifying each signature was completed.
- VerifyCompleted to handle completion event. This event occurs once verify process was completed.
Here are the steps to subscribe for verification process with GroupDocs.Signature:
- Define required handler delegates to process signing events.
- Create new instance of Signature class and pass source document path or stream as a constructor parameter.
- Subscribe for required events
- Instantiate required VerifyOptions object
- Call verify method of Signature class instance and pass verify options in it .
GroupDocs.Signature expects ProcessStartEventHandler delegate to subscribe for VerifyStarted event
private static void onVerifyStarted(Signature sender, ProcessStartEventArgs args)
{
System.out.print("Verify process started at "+args.getStarted()+" with "+args.getTotalSignatures()+" total signatures to be put in document");
}
private static void onVerifyProgress(Signature sender, ProcessProgressEventArgs args)
{
System.out.print("Verify progress. Processed "+args.getProcessedSignatures()+" signatures. Time spent "+args.getTicks()+" mlsec");
}
private static void onVerifyCompleted(Signature sender, ProcessCompleteEventArgs args)
{
System.out.print("Verify process completed at "+args.getCompleted()+" with "+args.getTotalSignatures()+" total signatures. Process took "+args.getTicks()+" mlsec");
}
private static void onVerifyStarted(Signature sender, ProcessStartEventArgs args)
{
System.out.print("Verify process started at "+args.getStarted()+" with "+args.getTotalSignatures()+" total signatures to be put in document");
}
private static void onVerifyProgress(Signature sender, ProcessProgressEventArgs args)
{
System.out.print("Verify progress. Processed "+args.getProcessedSignatures()+" signatures. Time spent "+args.getTicks()+" mlsec");
}
private static void onVerifyCompleted(Signature sender, ProcessCompleteEventArgs args)
{
System.out.print("Verify process completed at "+args.getCompleted()+" with "+args.getTotalSignatures()+" total signatures. Process took "+args.getTicks()+" mlsec");
}
public static void run()
{
try {
Signature signature = new Signature("sample.pdf");
signature.VerifyStarted.add(new ProcessStartEventHandler() {
public void invoke(Signature sender, ProcessStartEventArgs args) {
onVerifyStarted(sender, args);
}
});
signature.VerifyProgress.add(new ProcessProgressEventHandler() {
public void invoke(Signature sender, ProcessProgressEventArgs args) {
onVerifyProgress(sender, args);
}
});
signature.VerifyCompleted.add(new ProcessCompleteEventHandler() {
public void invoke(Signature sender, ProcessCompleteEventArgs args) {
onVerifyCompleted(sender, args);
}
});
TextVerifyOptions options = new TextVerifyOptions("John Smith");
options.setAllPages(true);
// verify document
VerificationResult result = signature.verify(options);
if (result.isValid())
{
System.out.print("\nDocument was verified successfully!");
}
else
{
System.out.print("\nDocument failed verification process.");
}
} catch (Exception e) {
throw new GroupDocsSignatureException(e.getMessage());
}
}
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 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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