Subscribing for search process events Leave feedback
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Signature class contains several events that are being called for different search process stages
- SearchStarted to handle process start event. This event is occur once Search method is called
- SearchProgress to handle progress event. This event occurs each time on searching each document page.
- SearchCompleted to handle completion event. This event occurs once Search process was completed.
Here are the steps to subscribe for searching process with GroupDocs.Signature:
- Define required handler delegates to process searching events.
- Create new instance of Signature class and pass source document path or stream as a constructor parameter.
- Subscribe for required events.
- Instantiate required SearchOptions object.
- Call Search method of Signature class instance and pass search options in it.
GroupDocs.Signature expects ProcessStartEventHandler delegate to subscribe for SearchStarted event
private static void OnSearchStarted(Signature signature, ProcessStartEventArgs args)
{
Console.WriteLine("Search process started at {0} with {1} total signatures to be put in document", args.Started, args.TotalSignatures);
}
private static void OnSearchProgress(Signature signature, ProcessProgressEventArgs args)
{
Console.WriteLine("Search progress. Processed {0} signatures. Time spent {1} mlsec", args.ProcessedSignatures, args.Ticks);
}
private static void OnSearchCompleted(Signature signature, ProcessCompleteEventArgs args)
{
Console.WriteLine("Search process completed at {0} with {1} total signatures. Process took {2} mlsec", args.Completed, args.TotalSignatures, args.Ticks);
}
private static void OnSearchStarted(Signature sender, ProcessStartEventArgs args)
{
Console.WriteLine("Search process started at {0} with {1} total signatures to be put in document", args.Started, args.TotalSignatures);
}
private static void OnSearchProgress(Signature sender, ProcessProgressEventArgs args)
{
Console.WriteLine("Search progress. Processed {0} signatures. Time spent {1} mlsec", args.ProcessedSignatures, args.Ticks);
}
private static void OnSearchCompleted(Signature sender, ProcessCompleteEventArgs args)
{
Console.WriteLine("Search process completed at {0} with {1} total signatures. Process took {2} mlsec", args.Completed, args.TotalSignatures, args.Ticks);
}
public static void Run()
{
using (Signature signature = new Signature("SignedSample.pdf"))
{
signature.SearchStarted += OnSearchStarted;
signature.SearchProgress += OnSearchProgress;
signature.SearchCompleted += OnSearchCompleted;
BarcodeSearchOptions options = new BarcodeSearchOptions()
{
// specify special pages to search on
AllPages = true
};
// search for signatures in document
List<BarcodeSignature> signatures = signature.Search<BarcodeSignature>(options);
Console.WriteLine("\nSource document contains following signatures.");
foreach (var barcodeSignature in signatures)
{
Console.WriteLine("Barcode signature found at page {0} with type {1} and text {2}",
barcodeSignature.PageNumber, barcodeSignature.EncodeType, barcodeSignature.Text);
}
}
}
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 sign PDF, Word, Excel, PowerPoint, and other documents you can use the online apps from the GroupDocs.Signature App Product Family.
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