VB Converter - SDK sample

The VB Converter sample demonstrates how to convert an existing file by printing it to novaPDF Printer using the ShellExecute function. It also demonstrates how to set different options and manage profiles in the novaPDF SDK application.

Note: To be able to use the samples you must install novaPDF SDK as samples work only with it. Download it here: nova PDF SDK.

The same approach should be used if you print using a "Print()" method from another object (like an internet browser or a report control). Just replace the ShellExecute call with the call of your Print method.

When the application starts, it creates a few profiles and makes different settings in the profiles. Then it shows a dialog from where the user can select the active profile and change its settings using the controls from the dialog. After that a document can be selected from the harddisk and printed to novaPDF Printer using the ShellExecute function call.

When using this technique to convert a file to PDF, you have to take care of the fact that ShellExecute prints to the default printer. This function returns immediately and does not wait until the print is finished (it may return before the printing is actually started). Therefore you have to set the default printer to novaPDF Printer before calling ShellExecute (using the SetDefaultPrinter method), register FileSaved message (or any other novaPDF Printer message) to be sure that the print job was started. In this message handler restore the default printer (with the RestoreDefaultPrinter method). This way you made sure that the default printer was restored and your document is printed to novaPDF Printer.

Source Code Snippets

1. Declare INovaPdfOptions variable 'create the NovaPdfOptions object Public m_NovaOptions As New NovaPdfOptions80 2. Register <%SDK_SAMPLE_PRINTER%> messages Public wm_Nova_FileSaved As Long Public wm_Nova_PrintError As Long Sub Main() ' Registering the messages send by the print in order to listen for them wm_Nova_FileSaved = RegisterWindowMessage(MSG_NOVAPDF2_FILESAVED) wm_Nova_PrintError = RegisterWindowMessage(MSG_NOVAPDF2_PRINTERROR) Form1.Show End Sub ' Sub that will handle the windows messages Public Function VB_WindowProc(ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long ' For the registered messages perform specific tasks If wMsg = wm_Nova_FileSaved Then OnNovaPDFFileSaved wParam, lParam Exit Function End If If wMsg = wm_Nova_PrintError Then OnNovaPDFPrintError wParam, lParam Exit Function End If ' For other messages just send them via normal (old) handling process VB_WindowProc = CallWindowProc(oldHandler, hwnd, wMsg, wParam, lParam) End Function 3. Initialize INovaPdfOptions Private Sub Form_Load() On Error GoTo ErrorHandler: Dim strProfileID As String Dim strProfileName As String Dim strActiveProfileID As String Dim nPublicProfile As Long Dim nActivePublicProfile As Long ' initialize the NovaPdfOptions object to use with a printer licensed for SDK m_NovaOptions.Initialize (PRINTER_NAME, "") ' sets the value of the windows messages handler to VB_WindowProc and sets the old handler address of function in oldHandler oldHandler = SetWindowLongApi(Me.hwnd, GWL_WNDPROC, AddressOf VB_WindowProc) cmbProfiles.Clear Call AddSmallSize Call AddFullOptions ' get the active profile ... m_NovaOptions.GetActiveProfile2 strActiveProfileID m_NovaOptions.GetFirstProfile2 strProfileID m_NovaOptions.LoadProfile2 strProfileID m_NovaOptions.GetOptionString2 NOVAPDF_PROFILE_NAME, strProfileName cmbProfiles.AddItem (strProfileName) On Error Resume Next Do m_NovaOptions.GetNextProfile2 (strProfileID) If err.Number = NV_NO_MORE_PROFILES Then Exit Do End If m_NovaOptions.LoadProfile2 strProfileID m_NovaOptions.GetOptionString2 NOVAPDF_PROFILE_NAME, strProfileName cmbProfiles.AddItem (strProfileName) Loop While True On Error GoTo ErrorHandler: cmbProfiles.ListIndex = 0 UpdateDialogFromProfile Exit Sub ErrorHandler: Debug.Print err.Number & ":" & err.Description End Sub 4. Set <%SDK_SAMPLE_PRINTER%> Options Private Sub AddSmallSize() Dim strProfileID As String On Error GoTo ErrHandler m_NovaOptions.AddProfile2 SMALL_SIZE_PROFILE, PROFILE_IS_PUBLIC, strProfileID m_NovaOptions.LoadProfile2 (strProfileID) ' Set some options to this profile ' disable the "Save PDF file as" prompt m_NovaOptions.SetOptionLong2 NOVAPDF_SAVE_PROMPT_TYPE, PROMPT_SAVE_NONE ' set generated Pdf files destination folder "c:\" m_NovaOptions.SetOptionString2 NOVAPDF_SAVE_FOLDER, "c:\" ' set output file name m_NovaOptions.SetOptionString2 NOVAPDF_SAVE_FILE_NAME, "PDF Converter small size.pdf" ' if file exists in the destination folder, append a counter to the end of the file name m_NovaOptions.SetOptionLong2 NOVAPDF_SAVE_FILEEXIST_ACTION, FILE_CONFLICT_STRATEGY_AUTONUMBER_NEW ' don't detect URLs m_NovaOptions.SetOptionLong2 NOVAPDF_URL_ANALIZE, False ' Set image compresion method to JPEG and quality to 75, possible values are from 10 to 100 m_NovaOptions.SetOptionLong2 NOVAPDF_COMPRESS_ENABLE, True m_NovaOptions.SetOptionLong2 NOVAPDF_COMPRESS_HIGH_COLOR, True m_NovaOptions.SetOptionLong2 NOVAPDF_COMPRESS_HIGH_COLOR_TYPE, COMPRESS_METHOD_JPEG m_NovaOptions.SetOptionLong2 NOVAPDF_COMPRESS_HIGH_COLOR_LEVEL, 75 ' make sure text compression is enabled, and set compression level to 9 maximum posible values are 1-9 m_NovaOptions.SetOptionLong2 NOVAPDF_COMPRESS_TEXT_GRAPHICS, True m_NovaOptions.SetOptionLong2 NOVAPDF_COMPRESS_TEXT_GRAPHICS_LEVEL, 9 ' disable unused font embeding m_NovaOptions.SetOptionLong2 NOVAPDF_FONTS_EMBED_ALL_USED_FONTS, False 'save profile changes m_NovaOptions.SaveProfile Exit Sub ErrHandler: If err.Number <> NV_PROFILE_EXISTS Then Debug.Print err.Number & ":" & err.Description End Sub 5. Start a Print job Private Sub btnStartPrinting_Click() ...... m_NovaOptions.SetActiveProfile2 (strProfileID) m_NovaOptions.SetDefaultPrinter Dim strToExecute As String Dim r As Long m_NovaOptions.RegisterEventWindow Me.hwnd m_NovaOptions.LicenseShellExecuteFile txtFileToConvert r = ShellExecute(Me.hwnd, "print", txtFileToConvert, "", "", SW_HIDE) btnStartPrinting.Enabled = True ..... End Sub 6. Restore default printer when printing finished Private Sub OnNovaPDFFileSaved(wParam As Long, lParam As Long) m_NovaOptions.UnRegisterEventWindow m_NovaOptions.RestoreDefaultPrinter End Sub Private Sub OnNovaPDFPrintError(wParam As Long, lParam As Long) Select Case wParam Case ERROR_MSG_TEMP_FILE: MsgBox "Error saving temporary file on printer server", vbOKOnly, "novaPDF" Case ERROR_MSG_LIC_INFO: MsgBox "Error reading license information", vbOKOnly, "novaPDF" Case ERROR_MSG_SAVE_PDF: MsgBox "Error saving PDF file", vbOKOnly, "novaPDF" Case ERROR_MSG_JOB_CANCELED: MsgBox "Print job was canceled", vbOKOnly, "novaPDF" End Select m_NovaOptions.UnRegisterEventWindow m_NovaOptions.RestoreDefaultPrinter End Sub 


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