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/DynaPDF/Create PDF with Custom Signature

Required plugins for this example: MBS DynaPDF Plugin, MBS Encryption Plugin

You find this example project in your Plugins Download as a Xojo project file within the examples folder: /DynaPDF/Create PDF with Custom Signature

This example is the version from Wed, 14th Sep 2021.

Project "Create PDF with Custom Signature.xojo_binary_project"
Filetype text
End FileTypes
MenuBar MenuBar1
MenuItem UntitledMenu1 = ""
MenuItem FileMenu = "&File"
MenuItem FileQuit = "Quit"
MenuItem UntitledMenu5 = ""
MenuItem EditMenu = "&Edit"
MenuItem EditUndo = "&Undo"
MenuItem UntitledMenu0 = "-"
MenuItem EditCut = "Cu&t"
MenuItem EditCopy = "&Copy"
MenuItem EditPaste = "&Paste"
MenuItem EditClear = "Clear"
MenuItem UntitledMenu4 = ""
MenuItem UntitledMenu3 = ""
MenuItem UntitledMenu2 = ""
End MenuBar
Class App Inherits Application
Const Message = "This file was digitally signed."
EventHandler Sub Open() dim pdf as new MyDynapdfMBS dim d as new date pdf.SetLicenseKey "Lite" // For this example you can use a Starter, Lite, Pro or Enterprise License call pdf.CreateNewPDF nil // The output file is opened later call pdf.SetDocInfo pdf.kdiTitle, "Custom digital signature" // We want to use top-down coordinates call pdf.Append Call pdf.SetFont "Arial", pdf.kfsNone, 12.0, True, pdf.kcpUnicode Call pdf.WriteFText pdf.ktaJustify, Message //* ------------------------------------------------------------------------ */ call pdf.EndPage // No fatal error occurred? if pdf.HaveOpenDoc then dim f as FolderItem = SpecialFolder.Desktop.Child("Create PDF with Custom Signature.pdf") if pdf.OpenOutputFile(f) then // Now we can sign the PDF file // In this example we load a PFX certificate file const password = "123456" // read from file dim filePath as FolderItem = SpecialFolder.Desktop.Child("test.pfx") dim b as BinaryStream = BinaryStream.Open(filePath) dim certificateData as string = b.Read(b.Length) // load PKCS12 file to get private key dim cert as X509MBS dim certs() as X509MBS dim pkey as PKeyMBS if X509MBS.ReadFromPkcs12(certificateData, password, pkey, cert, certs) then // get private key as text dim PrivateKey as string = pkey.PrivateKeyData // sign something so we know length dim DummySignature as string = OpenSSLMBS.PKCS7SignData(cert, pkey, certs, SHA1MBS.Hash("test"), 0) // sign parameters dim p as new DynaPDFSigParmsMBS p.ContactInfo = "Call MBS for help." p.Reason = "Signed for demo purpose" p.Signer = "TestApp" p.HashType = DynaPDFMBS.khtSHA1 p.PKCS7ObjLen = lenb(DummySignature) // now assemble PDF and leave room for signature if pdf.CloseAndSignFileExt(p) then // sign the Hash dim Signature as string = OpenSSLMBS.PKCS7SignData(cert, pkey, certs, p.Range1, 0) // add hash to file and launch in PDF reader if pdf.FinishSignature(Signature) then f.Launch end if end if else MsgBox "Failed to read PKCS12 file" end if end if end if quit End EventHandler
End Class
Class MyDynaPDFMBS Inherits DynaPDFMBS
EventHandler Function Error(ErrorCode as integer, ErrorMessage as string, ErrorType as integer) As integer // output all messages on the console: System.DebugLog str(ErrorCode)+": "+ErrorMessage // and display dialog: Dim d as New MessageDialog //declare the MessageDialog object Dim b as MessageDialogButton //for handling the result d.icon=MessageDialog.GraphicCaution //display warning icon d.ActionButton.Caption="Continue" d.CancelButton.Visible=True //show the Cancel button // a warning or an error? if BitAnd(ErrorType, me.kE_WARNING) = me.kE_WARNING then // if user decided to ignore, we'll ignore if IgnoreWarnings then Return 0 d.Message="A warning occurred while processing your PDF code." // we add a third button to display all warnings d.AlternateActionButton.Caption = "Ignore warnings" d.AlternateActionButton.Visible = true else d.Message="An error occurred while processing your PDF code." end if d.Explanation = str(ErrorCode)+": "+ErrorMessage b=d.ShowModal //display the dialog Select Case b //determine which button was pressed. Case d.ActionButton Return 0 // ignore Case d.AlternateActionButton IgnoreWarnings = true Return 0 // ignore Case d.CancelButton Return -1 // stop End select End EventHandler
Property IgnoreWarnings As Boolean
End Class
End Project

See also:

The items on this page are in the following plugins: MBS DynaPDF Plugin.

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