How to save unsaved changes to pdf file?

Question

Hi,
I have a plugin for signature creation and verification created using acrobat sdk 9 and testing in acrobat x. When user initiates a signature creation process, in SigGetSigProperties() callback, i need to save any unsaved changes in the pdf file before i proceed with the signature creation process. To achieve this i added this code to SigGetSigProperties() callback:
// Save unsaved changes to file.
AVDoc avDoc = AVAppGetActiveDoc();
if( avDoc )
PDDoc pdDoc = AVDocGetPDDoc(avDoc);
// save unsaved changes
PDDocSave(pdDoc, PDSaveIncremental, NULL, NULL, NULL/*AVAppGetDocProgressMonitor(NULL)*/, NULL);
But this code generates this error:
Creation of this signature could not be completed.
Unknown error
supported information: CDSHandler-657
and
Creation of this signature could not be completed.
Error at File: ..\sources\DSHandler.cpp , Line: __LINE__
What am i doing wrong here? is this the right approach and is there a better way to achieve this?
thanks and regards,

Answer 1

Hi,
Actually, i need to save the pdf just before signing starts. saving at idle handler will not fullfil our requirements. how can i achieve this?
And keeping in mind the above requirement, when i think about adding a button or menu item, as u suggested, the only thing that comes in my mind is that, i disable the signature creation button and add my own button for signature. When its presses i save the pdf and internally call the acrobat's default signature button to start the signing process. But firstly i dont know if its possible. and secondly, there still remains the scenario where the user clicks an empty field to start the signing process.
what should i do?