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    5. GroupDocs.Signature for Java
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    7. Developer Guide
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    9. Advanced usage
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    11. Deleting
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    13. ✖ QR Code

    Deleting QR-code signatures - advanced

    GroupDocs.Signature provides QrCodeSignature class to manipulate QR-code signatures and delete them from the documents over delete method.
    Please be aware that delete  method modifies the same document that was passed to constructor of Signature class.

    Here are the steps to delete QR-code signature from 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 QrCodeSignature;

    • Select from list QrCodeSignature object(s) that should be removed from the document;

    • Call Signature object delete  method and pass one or several signatures to it.

    • Analyze DeleteResult result to check whether signatures were updated or not.

    Here are the alternative steps to delete QR-code signature from the document with GroupDocs.Signature. This approach is based on saved signatures Id after search or sign methods.

    • Create new instance of Signature class and pass source document path as a constructor parameter;

    • Instantiate one or several QrCodeSignature objects with signature Id(s) passed to constructor;

    • Call Signature class object delete method and pass one or several signatures to it;

    • Analyze DeleteResult result to check whether signatures were updated or not. 

    This example shows how to delete QR-code signature that was found using search method.

    // initialize Signature instance
Signature signature = new Signature("signed.docx");
 
QrCodeSearchOptions options = new QrCodeSearchOptions();
 
List<QrCodeSignature> signatures = signature.search(QrCodeSignature.class,options);
List<BaseSignature> signaturesToDelete = new ArrayList<BaseSignature>();
// collect signatures to delete
for (QrCodeSignature temp : signatures)
{
    if (temp.getText().contains("John"))
    {
        signaturesToDelete.add(temp);
    }
}
// delete signatures
DeleteResult deleteResult = signature.delete("signed.docx",signaturesToDelete);
if (deleteResult.getSucceeded().size() == signaturesToDelete.size())
{
    System.out.print("All signatures were successfully deleted!");
}
else
{
    System.out.print("Successfully deleted signatures : " + deleteResult.getSucceeded().size());
    System.out.print("Not deleted signatures : " + deleteResult.getFailed().size());
}
System.out.print("List of deleted signatures:");
for(BaseSignature temp : deleteResult.getSucceeded())
{
    System.out.print("Signature# Id:"+temp.getSignatureId()+", Location: "+temp.getLeft()+"x"+temp.getTop()+". Size: "+temp.getWidth()+"x"+temp.getHeight());
}

    Delete QR-code signature from the document by known signature Identifier

    This example shows how to delete QR-code signature in the document by known signature Id (that was obtained by  search or sign method previously).

    // initialize Signature instance
Signature signature = new Signature("signed.pdf");
 
// read from some data source signature Id value
String[] signatureIdList = new String[]
    {
            "1a5fbc08-4b96-43d9-b650-578b16fbb877",
            "b0123987-b0d4-4004-86ec-30ab5c41ac7e"
    };
// create list of QR-code Signature by known SignatureId
List<BaseSignature> signatures = new ArrayList<BaseSignature>();
for (String item : signatureIdList)
{
    signatures.add(new QrCodeSignature(item));
}
 
// delete required signatures
DeleteResult deleteResult = signature.delete("signed.pdf",signatures);
if (deleteResult.getSucceeded().size() == signatures.size())
{
    System.out.print("All signatures were successfully deleted!");
}
else
{
    System.out.print("Successfully deleted signatures : " + deleteResult.getSucceeded().size());
    System.out.print("Not deleted signatures : " + deleteResult.getFailed().size());
}
System.out.print("List of deleted signatures:");
for(BaseSignature temp : deleteResult.getSucceeded())
{
    System.out.print("Signature# Id:"+temp.getSignatureId()+", Location: "+temp.getLeft()+"x"+temp.getTop()+". Size: "+temp.getWidth()+"x"+temp.getHeight());
}

    More resources 

    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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