Not clear on what you're trying to do - are these actual PDF forms or do you just need to put data into an existing vanilla PDF?
If it's any help I did some code recently to add a customer signature captured from a signature pad to a PDF invoice. One of the methods I investigated was generating the invoice first and then merging the signature graphic in. It used the free Debenu Quick PDF Lite Library (http://www.debenu.com/products/development/debenu-pdf-library-lite/) which has support for merging graphics into PDFs. Ultimately I didn't end up going down this route but here's the business end of it FWIW. You might need the paid version to merge text or fill PDF forms.
* -- Parameters are target PDF, the filename of the graphic with the signature, and the image dimensions.
Function SignPDF(lcPDFFile as String, lcSigFile as String, loParms as Object) Local lnFileID, lnImageID
With goApplication.oDebenuPDF
If .LoadFromFile(lcPDFFile, "") > 0
? "PageHeight=" + Transform(.PageHeight)
.SelectPage(1) && - -TODO each page or last? .NormalizePage(0) .SetOrigin(1) && -- Top left lnFileID = .SelectedDocument lnImageID = .AddImageFromFile(lcSigFile, 0)
If lnImageID > 0
If .SelectImage(lnImageID) > 0
if .DrawImage(loParms.ImgLeft, loParms.ImgTop, ; loParms.ImgWidth, loParms.ImgHeight) > 0
If .SaveToFile(lcPDFFile) = 0 ?"ERROR: Could not save " + lcPDFFile Else ? "Merge successful." Endif
Else ? "Could not draw image." endif
Else ? "Could not select image." Endif
Else ? "ImageID = 0" Endif
Else ? "Could not load image file." EndIf
EndWith
Endfunc