Problem with signing a PDF

hey all,

I'm currently busy with figuring out how to sign a pdf.

I first convert a document type to pdf and then will try to sign the file with a pfx file.

        }

public void SignPFD(string filename)
        {
            int temp;
            temp = mGenerator.SignFile(filename, "", "Tempfield", "C", "Certificate.pfx", "PASSWORD", "j", "i", "z");
            System.Console.Write(temp + "signfile output \n");
        }

but i get a Error:

    Exception thrown: 'System.AccessViolationException'

    An unhandled exception of type 'System.AccessViolationException'

    Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

when the programs tries to run the code SignFile.

Am i overlooking something?

PS. all the other things do work. The problems is only with signing the file

EDIT:

i have also tried another approach:

            mGenerator.DrawText(100, 700, "This is the file to be signed");
            mGenerator.SaveToFile("TheUnsignedFile.pdf");

            int SignProcessID = mGenerator.NewSignProcessFromFile("TheUnsignedFile.pdf", "");
            if (SignProcessID > 0) {
                mGenerator.SetSignProcessPFXFromFile(SignProcessID, "Certificate.pfx", "PASSWORD");
                mGenerator.SetSignProcessInfo(SignProcessID, "To test digital signatures", "The World", "Contact me");
                mGenerator.SetSignProcessField(SignProcessID, "Contract Signature");
                mGenerator.SetSignProcessFieldBounds(SignProcessID, 100, 600, 200, 100);
                mGenerator.SetSignProcessFieldImageFromFile(SignProcessID, "visualsignature.jpg", 0);
                mGenerator.EndSignProcessToFile(SignProcessID, "TheSignedFile.pdf");
            }

but i get the same Error at the function EndSignProcessToFile.

Hey Ingo,

Thank for you reply.

I'm programming in C3 with visualstudio 2017.

As for the string handling. I looked it up and don't find a problem with the unicode-format.

The build target is set to any-cpu and VS is a 32-bit installation.

Also, i'm using the Dll version 9.16 got both 32 and 64 dll's

And yes, i have found the examples ans such. Thanks ^^

I hope this will give a little bit extra information.

I keep searching for the solution myself further.

Greeting,

Hi Ingo,

I have been continue searching for the problem. It seems to be a problem with bit type you are using. If i call the function in a 32bit solution, the function works fine. But if i build a 64 bit solution i get the memory problem.

I also have tested it with a new project. Making a simple pdf en then trying to sign it. There the same problem occurs. 32bit works, 64 bit doesn't work.

Can it be that there is something wrong with variables that are parsed wrong in the libary if you use a 64 bit?

Also, the same problem also come with the function RenderPageToDC, but there the 64bit version works and the 32 bit version doesn't work.

I hope this might help people and maybe it is a bug?