Writing and Saving to a PDF with VBA - vba

Question

I have been able to successfully write to a pdf, but now I am trying to save it. I know I need to use a pddoc in order to save, but I can't set it to match the avdoc that I use to write to the pdf. The real code has a lot of fields so I will just reduce that to one field and put what I have below:
Sub mysub()
'basic declarations and initializations
Dim myfullpath As String
Dim myField As String
myfullpath = "C:\mypdf.pdf"
myField = "Hello"
'pdf overhead declarations and initializations
Dim aApp As Acrobat.AcroApp
Dim av_doc As Acrobat.AcroAVDoc
Dim pdf_form As AFORMAUTLib.AFormApp
Set aApp = CreateObject("AcroExch.App")
Set av_doc = CreateObject("AcroExch.AVDoc")
Set pdf_form = CreateObject("AFORMAUT.App")
If av_doc.Open(myfullpath, "") = True Then
'declare and initialize pdf fields
Dim pdfField As AFORMAUTLib.Field
Set pdfField = pdf_form.Fields("pdfField")
'set value in pdf
pdfField = myField
'declare and initialize pddoc in order to save
Dim PdfDoc As Acrobat.CAcroPDDoc
Set PdfDoc = av_doc 'having trouble here
'“Run-time error ‘13’: Type mismatch”
PdfDoc.Save PDSaveFull, myfullpath
av_doc.Close False
Set pdfField = Nothing
End If
aApp.Exit
Set aApp = Nothing
Set av_doc = Nothing
Set PdfDoc = Nothing
End Sub

Answer 1

This worked for me:
Sub mysub()
Dim myfullpath As String, myfullpath_edited As String
Dim myField As String
Dim aApp As Acrobat.AcroApp
Dim av_doc As Acrobat.AcroAVDoc
Dim pdfField As Object 'AFORMAUTLib.Field
Dim PdfDoc As Acrobat.CAcroPDDoc
Dim pdf_form As Object 'AFORMAUTLib.AFormApp
myfullpath = "C:\Tester\mypdf.pdf"
myfullpath_edited = "C:\Tester\mypdf_edited.pdf"
myField = "Hello"
Set aApp = CreateObject("AcroExch.App")
Set av_doc = CreateObject("AcroExch.AVDoc")
Set pdf_form = CreateObject("AFORMAUT.App")
'aApp.Show
If av_doc.Open(myfullpath, "") Then
'av_doc.BringToFront
Set pdfField = pdf_form.Fields("pdfField")
pdfField.Value = myField 'set value in pdf
Set PdfDoc = av_doc.GetPDDoc '<<<<<<<<<<<<<<
PdfDoc.Save PDSaveFull, myfullpath_edited
av_doc.Close False
End If
aApp.Exit
Set aApp = Nothing
Set av_doc = Nothing
Set PdfDoc = Nothing
End Sub