Solved

Selecting a printer with code.

Posted on 1998-05-28
2
394 Views
Last Modified: 2010-04-03
As a beginner in Delphi.  How do I select a non default printer with code ?  I know you can use getprinter and printerindex etc, but am unsure how to use these functions.
Help !  

0
Comment
Question by:dmcqueen
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 7

Expert Comment

by:BlackMan
ID: 1348804
If you are talking standard Delphi, you should take a look at TPrinter (type it in a unit and press F1). It has a Printers and a PrinterIndex property. Below is a snip from D2 help.

if (MessageDlg('Do you want to use the default printer',
    mtInformation, mbYesNoCancel,0)=idYes) then
      Printer.PrinterIndex := -1;
0
 
LVL 1

Accepted Solution

by:
Edo082297 earned 40 total points
ID: 1348805
Hi dmc,

There are a number of different ways to do what you want to do. I am assuming that you want to print to another printer, without changing the default printer on the machine. I am assuming that you know the name of the printer (it has been chosen from a list box or something; I show a method to get them below).

procedure ChangePrinters( i : Integer );  
var
  Device, Driver, Port: array[0..79] of char;
  Dest : PChar;
  DeviceMode: THandle;
begin
  Printer.PrinterIndex := i;
  // store information about printer[i]

  Printer.GetPrinter(Device, Driver, Port, DeviceMode);
  // ("Device" is now the friendly name of the printer)

  if DeviceMode <> 0 then // if there has been no weird error
  begin
    // Lock the DeviceMode structure:
    Dest := GlobalLock(DeviceMode);

    // copy the name of the printer into the DevMode structure:
    StrCopy(Dest, Device);
   
    // !Unlock what we locked!
    GlobalUnlock(DeviceMode);
  end;
end;

What is going on here? Well, first we are loading the arrays we declared with information about the printer. This information is stored in something called the DevMode structure (look it up in Win32.hlp). You can read and write values to this structure by locking it, using GlobalLock. This tells Windows that you want to talk to the structure for a moment (Windows otherwise keeps moving it around in memory!). Unlocking is very important.

In fact, the StrCopy up there isn't the best way to change the printer, but it works for our purposes. I am trying to keep in mind that you are a beginner, so I won't overwhelm you with pointers to the DevMode structure. If you want to know a better way, let me know, and I will post a better, but more complicated, version of the above.

Regards,

Edo
0

Featured Post

Enroll in June's Course of the Month

June's Course of the Month is now available! Every 10 seconds, a consumer gets hit with ransomware. Refresh your knowledge of ransomware best practices by enrolling in this month's complimentary course for Premium Members, Team Accounts, and Qualified Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…
NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…

695 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question