Add Digital Signature to a PDF programmatically using Adobe SDK and Microsoft .NET

Requirement:

- Adobe Professional Installed

- Adobe SDK downloaded

- Microsoft Visual Studio

- Valid Certificate file (.pfx). It means the .pfx file not yet expired.

Setup environment:

- Copy sdkAddSignature.js from SDK to Acrobat\Javascripts folder

- Optional: Create Your Own Test Certificate

Code C#

            Type AcrobatCAcroAppType;
            AcrobatCAcroAppType = Type.GetTypeFromProgID("AcroExch.app");
            Acrobat.CAcroApp gapp = (Acrobat.CAcroApp)Activator.CreateInstance(AcrobatCAcroAppType);

            Type AcrobatPDDocType;
            AcrobatPDDocType = Type.GetTypeFromProgID("AcroExch.PDDoc");
            Acrobat.CAcroPDDoc gpddoc = (Acrobat.CAcroPDDoc)Activator.CreateInstance(AcrobatPDDocType);

            object jso;
            if (gpddoc.Open("d:\\temp\\s.pdf"))
            {
                jso = gpddoc.GetJSObject();
                object[] param = new object[1];

                param[0] = "c:\\CATest.pfx";
                object con = jso.GetType().InvokeMember("SetUserDigitalIDPath",
                BindingFlags.InvokeMethod, null, jso, param);

                param[0] = "testpassword";
                con = jso.GetType().InvokeMember("SetUserPassword",
                BindingFlags.InvokeMethod, null, jso, param);                    

                param[0] = jso;
                con = jso.GetType().InvokeMember("AddSignature",
                BindingFlags.InvokeMethod, null, jso, param);        
            }

Code VB:

        Dim gapp As Acrobat.CAcroApp
        Dim gpddoc As Acrobat.CAcroPDDoc
        Dim jso As Object
        gapp = CreateObject("acroexch.app")
        gpddoc = CreateObject("acroexch.pddoc")

        If gpddoc.Open("d:\temp\s.pdf") Then
            jso = gpddoc.GetJSObject()
            jso.SetUserPassword("testpassword")
            jso.SetUserDigitalIDPath("/C/CATest.pfx") //remember this path
            jso.AddSignature(jso)
            gapp.Show()
        End If

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