Propper Usage of QuickPDF in Visual Basic 6

because I have lost a lot of time debuging problems caused by not checking the exit codes on UnlockKey and LoadFromFile function I decoded to publish some helper to help you in writing VB6 QuickPDF based applications.

 

Wen you want to create a new QuickPDF instance use:

    CreateQuickPDF function

and when you want to load a new PDF document and

unload the current one (usefull with single document applications) use:

    LoadDocument procedure.

 

Both functions/procedures throw errors when something fails !!!

 

Happy Programming :-)

Marian

 

<Module name="QPDF helper">

Attribute VB_Name = "QPDF"
Option Explicit
Public Const qPDFLicenseKey = "your license key"

 

' Create a new QuickPDF instance
Public Function CreateQuickPDF() As iSED.QuickPDF
    Dim QP As iSED.QuickPDF

    Set QP = CreateObject("iSED.QuickPDF")
    If QP.UnlockKey(qPDFLicenseKey) = 0 Then
        Err.Raise vbObjectError, , "Cannot unlock quickpdf library: " & QP.LicenseInfo
    End If

    Set CreateQuickPDF = QP
End Function

 

' Load a new PDF document
Public Sub LoadDocument(ByRef QP As iSED.QuickPDF, ByVal FileName As String)
    Dim nOldDoc As Long
    Dim nNewDoc As Long

    nOldDoc = QP.SelectedDocument
    If QP.LoadFromFile(FileName) = 0 Then
        Err.Raise vbObjectError, , "Cannot open pdf document: " & FileName
    End If

    nNewDoc = QP.SelectedDocument
    If QP.Encrypted > 0 Then
        If QP.Unencrypt = 0 Then
            Call QP.RemoveDocument(nNewDoc)
            Call QP.SelectDocument(nOldDoc)
            Err.Raise vbObjectError, , "Document cannot be decrypted"
        End If
    End If
    Call QP.RemoveDocument(nOldDoc) ' discard previous document
End Sub
</Module>

 

<Module name="test QPDF module">

Public Sub PrintTest()
    Call PrintDocument( _

        App.Path & "\some file.pdf", _

        "SomePrinter device")
End Sub

Public Sub PrintDocument(ByVal FileName As String, ByVal PrintDevice As String)
On Error GoTo err_Main
   
    Dim QP As iSED.QuickPDF
    Dim Printeroptions As Long
    Dim PrintResult As Long
   
    ' Create quickPDF object
    Set QP = CreateQuickPDF
   
    ' Load PDF document
    Call LoadDocument(QP, FileName)
       
    ' Print document
    Printeroptions = QP.PrintOptions(0, 0, "PDF output")
    PrintResult = QP.PrintDocument(PrintDevice, 1, QP.PageCount, Printeroptions)

    MsgBox "Finished"
exit_Main:
    Set QP = Nothing
    Exit Sub
   
err_Main:
    MsgBox Err.Description
    Resume exit_Main
End Sub
</Module>