31 December 2012

Printing a listing on another printer

If you are running a Windows Vista or Windows 7 operating system, then the procedure to select different printers has changed from earlier versions of Windows. Starting with Windows Vista the "Printer ..." button is missing from the common dialog Page Setup dialog box. This is a consequence of the newer Windows operating systems. Now if you want to change printers or print drivers, you must change the default printer from the “Devices and Printers” window

How does this affect printing from GFA-BASIC 32?
To print a listing you can select Print in the File submenu. Depending on the presence of a text-selection, Gfa_Print will either print the entire listing or the current selection only. The text is printed immediately, without an option to select a different printer or to cancel the print job.

Initially, when you haven't printed before, the listing is sent to the default printer using default settings. At very first time, on my default printer, this produces lines in a vey hard to read small font size printed in the upper left corner of the paper.
Now I'm aware of this behavior, I make sure to set the printer page options before I  start printing for the first time.
The printer settings are available in the Printer Tab in the GFA-BASIC 32 Properties dialog box. The top two buttons are used to customize GB32's printing options.

GB32 Properties Printer

Selecting the top button labeled 'Page Setup' will bring up the Page Setup common dialog box. The Page Setup dialog box allows the user to set the paper size, source, orientation, and margins for printing. Starting with Windows Vista the common dialog box that pops up in GFA-BASIC 32 looks like this. The margin settings are initialized to zero, so it is logical that the listing is printed in the top-left corner of the paper.

GB32 PageSetup

After changing the page settings and selecting OK, GFA-BASIC 32 updates the top button in the Printer Tab with the name of the Printer (here Lexmark).

  • Due to a bug in the GFA-BASICs English string data the button text isn't shown properly. Rather than providing the printer name it only shows the word 'Printer'. (The first image shows a fixed version of the IDE.)

Applying new settings
The Page Setup values aren't applied before selecting the OK button in the GFA-BASIC Properties dialog box. The same is true for values from the other tabs (Editor and Compiler). 
The printer settings are applied to some global application variables and stored in 4 registry values in 'HCKU\Software\GFA\Basic' register sub keys:

Printer String containing DEVNAMES values
PrinterDMF Data containing relevant DEVMODE values
PrinterFont Compressed LOGFONT structure
PrinterPage Margins, MarginMetrics, Options. Used to initialize the Properties Print Page

At the next start the GFA-BASIC IDE reads back the "PrinterPage" values from the registry and assigns them to the global Printer Page variables. These values are used to initialize the controls of the Printer Properties Page (hence the name PrinterPage).

The "Printer" and "PrinterDMF" registry values contain device specific information. When the actual process of printing is started these values are used to create a printer device context. In case the values are missing or corrupted GFA-BASIC will obtain a device context for the default printer and starts printing without any user intervention.

How changes affect GB32
If you paid attention, you will have noticed that GFA-BASIC 32 supports the logic for using different printer than the default printer, but lacks the possibility to select one. How come? Well in all their wisdom Microsoft decided to change the Page Setup common dialog box starting with Windows Vista. Previously, until Windows XP, the Page Setup common dialog box contained a third button labeled 'Printer ...". It was this button that allowed the user to select a different printer from the Page Setup dialog box.

Workaround? Hardly!
When GFA-BASIC 32 was released it could not be known that MS would remove the "Printer ..." button. GB32's printer selection logic was build entirely around this button in the Page Setup dialog. That was - and still is - the only way to select a different printer. The only remaining option is to set another printer as the default printer from the Control Panel, although that wouldn't suffice. You should also remove the registry settings "Printer" and "PrinterDMF".

By providing this background information I'm hoping for some input as of how to get an actually working hotfix.

1 comment:

  1. Anonymous12/11/17

    Also the GB32 command "SetPrinterByName()" works not with
    WinXP, WIn7, .....

    the solution:

    Declare Function SetDefaultPrinter Lib "winspool.drv" Alias "SetDefaultPrinterA" ( ByVal pszPrinter As String ) As Long

    Type makeDOCINFO
    cbSize As Long
    lpszDocName As Long
    lpszOutput As Long
    info As Card
    End Type
    Global info_$ = " " + Chr(0)
    Global DOCINFO As makeDOCINFO
    DOCINFO.cbSize = 8
    DOCINFO.lpszDocName = V:info_$
    DOCINFO.lpszOutput = Null
    DOCINFO.info = 0

    the new function/command:

    ~SetDefaultPrinter(myprinter$)

    Jens Fuhlendorf

    ReplyDelete