Introducing Microsoft® Office InfoPath™ 2003

Testing the Signed Data Blocks Collection

When you digitally sign an entire form, you can select the Prompt User To Sign The Form If It Is Submitted Without A Signature check box on the Digital Signatures tab of the Form Options dialog box. There’s no corresponding check box for the Enable Digital Signatures For Specific Data In The Form option. Warning the user that the form is missing or has invalid digital signatures requires iterating each member of the SignedDataBlocks collection and its Signatures collection to detect these conditions.

Listing 16-1 shows the code from the FnTestDigitalSignatures.txt file for the TestDigitalSignatures function, which you can call from the OnSaveRequest or OnSubmitRequest event handler. If a user receives ...