C# Discussion Boards - CodeProject

Changing the paper size at run time

30-Dec-03 5:40

You should try searching the forums using "Search Comments" above (search this, the lounge, and anything else that seems relevent). There is code out there and this has been answered before. Google will also reveal some results.

-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
-----END GEEK CODE BLOCK-----

Yaron K.29-Dec-03 19:32

Yaron K.

29-Dec-03 19:32

Hi

I have a code which prints to the printer using the PrintDocument & PrintPreviewDialog classes.

I need to specify at run time which paper size I want to use: A4, Letter, A3 etc. These are not custome sizes but rather standard sizes, listed in the PaperKind enum.

How can I force a certain paper size at run time? The PaperSize.Kind property is read only.

thanks

Mazdak29-Dec-03 23:42

Mazdak

29-Dec-03 23:42

In your Print_Page event of PrintDocument:

e.PageSettings.PaperSize

Mazy

No sig. available now.

Mehdi Moshtaghi30-Dec-03 0:27

Mehdi Moshtaghi

30-Dec-03 0:27

To Mazdak!!
Damn man don't you have anything else to do. Go study your exams !!! Cool | :cool:

Yaron K.30-Dec-03 2:25

Yaron K.

30-Dec-03 2:25

Thanks, but i still have the same problem.

I am trying to:

private void pd_PrintPage(object sender, PrintPageEventArgs e)
{
e.PageSettings.PaperSize.Kind = PaperKind.A3;
}

but i does not compile because PaperSize.Kind is read-only.

Heath Stewart30-Dec-03 5:35

30-Dec-03 5:35

You have to construct a new PaperSize like so:

private void pd_PrintPage(object sender, PrintPageEventArgs e)
{
  // I don't rem
  e.PageSettings.PaperSize =
    new PaperSize("Custom", 11.69 * 100, 16.54 * 100);
}

You should also take a look at the PrinterSetttings.PaperSizes documentation. This is a collection that contains each PaperSize that the printer supports. You can enumerate and determine if the printer supports A3 and then get that PaperSize:

foreach (PaperSize size in PrinterSettings.PaperSizes)
  if (size.Kind == PaperKind)
    return size;
return null; // or throw an Exception that A3 is not supported

IntegraSoft31-Dec-03 9:37

IntegraSoft

31-Dec-03 9:37

I tried this ans it doesnt work, The paper size is still 8.5 x 11. Do I Have to do something else.

Thanks.

Carlos Eduardo Hernandez P.

Heath Stewart31-Dec-03 9:40

31-Dec-03 9:40

See Mazdak's answer that he(/she?) copied from MSDN. I was just answering why you couldn't change the paper size with the code you were using. I thought it seemed weird that the original reply was doing this in PrintDocument.PrintPage.

IntegraSoft31-Dec-03 9:46

IntegraSoft

31-Dec-03 9:46

I try that as well and it didnt work. Am i doing somehting wrong?

thanks.

Carlos Eduardo Hernandez P.

Heath Stewart31-Dec-03 11:04

31-Dec-03 11:04

Are you sure the printer supports that size of paper? Use the other technique I mentioned where you get the sizes that it supports and see if that paper size is in the collection.

IntegraSoft1-Jan-04 7:50

IntegraSoft

1-Jan-04 7:50

I try using the enumeration of papersize and it didnt work. But I really need to define a custom size, not one defined on the printer. Before using .Net, I was using VB6, and in Windows 98, Windows 95, it was very easy to print in any paper size in the printer. But after windows NT, or windows 2000, my vb6 applications could not print on any sizes on those windows. I found out that after windows nt, it has to be creted a form and then attach it to the printer and print. Could it be that I have to do the same thing.

Thanks.

Carlos Eduardo Hernandez P.

Heath Stewart1-Jan-04 9:29

1-Jan-04 9:29

Why didn't enumerating work? That's supported by the Framework plus some Windows function that are P/Invoked and has more to do with the print server and the printer driver than the printer itself.

As far as forms, A3 is already supported so long as you use the dimensions that I gave in a previous example - no rounding! You could try it, though. After all, all the print classes and methods in the Framework are just wrappers for all the functionality in Windows anyway.

interop - array of structs with embedded strings

Mazdak30-Dec-03 6:26

Mazdak

30-Dec-03 6:26

THis is sample code from MSDN:

private void MyButtonPrint_Click(object sender, System.EventArgs e)
   {
      // Set the paper size based upon the selection in the combo box.
      if (comboPaperSize.SelectedIndex != -1) {
         printDoc.DefaultPageSettings.PaperSize = 
            printDoc.PrinterSettings.PaperSizes[comboPaperSize.SelectedIndex];
      }

      // Set the paper source based upon the selection in the combo box.
      if (comboPaperSource.SelectedIndex != -1) {
         printDoc.DefaultPageSettings.PaperSource = 
            printDoc.PrinterSettings.PaperSources[comboPaperSource.SelectedIndex];
      }
      
      // Set the printer resolution based upon the selection in the combo box.
      if (comboPrintResolution.SelectedIndex != -1) 
      {
         printDoc.DefaultPageSettings.PrinterResolution= 
            printDoc.PrinterSettings.PrinterResolutions[comboPrintResolution.SelectedIndex];
      }

      // Print the document with the specified paper size, source, and print resolution.
      printDoc.Print();
   }

Mazy

No sig. available now.

lavinder29-Dec-03 17:45

lavinder

29-Dec-03 17:45

Hi all

In one of my vc dlls, following structure and function have been declared:

struct mystruct
{
uint u1;
TCHAR arr1[30];
TCHAR arr2[15];
uint u2;
}

int testfunc(mystruct** arrptr)

i have declared c# equivalent of structure as

public class mystruct
{
public uint u1;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 30)]
public string arr1;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 15)]
public string arr2;
public uint u2;
}

Internally testfunc is implementing arrptr as pointer to array of structures.

My query is what should be declaration of this function. Should i pass class variable by ref, or IntPtr or ???

Thanks in advance

lsb

Re: interop - array of structs with embedded strings

Heath Stewart30-Dec-03 5:26

Re: serial por comunications

30-Dec-03 5:26

Both, actually. This is a pointer to a pointer to a struct (why in the world they would do that, I don't know). So your method should be P/Invoked like so:

[DllImport("whatever.dll")]
private int testfunc(ref IntPtr struct);

Then, take a look at the docs for information on the Marshal.StructureToPtr and Marshal.PtrToStructure methods. You'll need to allow for unsafe code using the /unsafe command-line switch, or turning on the Allow Unsafe Code option in your project to use StructureToPtr.

Also, you should add [StructLayout(LayoutKind.Sequential)] to your mystruct definition.

serial por comunications

pedropj29-Dec-03 17:00

pedropj

29-Dec-03 17:00

1. How do you access the serial port on a c# project, using windows forms?
2. How do you do access the serial port on an asp.net project? The port is on the client side, not the server. Does it has to be done with activex, if so, how?

Thanx,
Pedro

Heath Stewart30-Dec-03 5:16

Navigation in multiple forms

30-Dec-03 5:16

pedropj wrote:
1. How do you access the serial port on a c# project, using windows forms?

A simple search here on the CP site revealed several results: http://www.codeproject.com/info/search.asp?cats=3&cats=5&searchkw=serial+port[^]

pedropj wrote:
2. How do you do access the serial port on an asp.net project? The port is on the client side, not the server. Does it has to be done with activex, if so, how?

ASP.NET is stricly server-side technology (though some client-side javascripts and hidden form fields are used). You can host ActiveX controls in any HTML served from any web server, be it IIS, Apache, etc.

You don't have to use ActiveX, though. If you want to stick with .NET, you can use smart clients. See an article I wrote a long time back on another site (that's being transcribed and updated for this site) here: User Controls for Windows and the Web[^].

Even smart clients can be hosted in pages delivered by any web browser - even local pages served-up in your browser right off your hard drive. It's just that Internet Explorer (Mozilla doesn't do this...yet) is hosting the control. There is some documentation about this in the MSDN Library as well (under the .NET Framework SDK Documentation - see "Deployment").

Hayat29-Dec-03 16:51

Hayat

29-Dec-03 16:51

Hello experts
I am new to c# and i need your help
I want to create three forms in c# project and then nevigate through these forms by clicking the next and back buttons.
I have created a c# proj and then added two more forms i have created two buttons next and back on each form.Form3 also contains a Finish Button.
Now i want that when i click on the next button of firm1 it should load the Form2 and by clicking the next button of Form2 it should load Form3.
By clicking the back button of Form3 it should load the form2 and so on as we have seen during installation a s/w.

Any idea. Thanks in advance

Mehdi Moshtaghi30-Dec-03 0:37

Mehdi Moshtaghi

30-Dec-03 0:37

I'm not sure if it's the best way. But I do it like this.
In form1 (which you raise form2) pass form1 as a constructor parameter or as a public variable to it. then you can access form1 in form2 thruogh this. something like

form2 f2 = new form2(form1); // in form1

system.Windows.Form f1;
public form2(system.Windows.Form f) // form 2 constructor
{
f1 = f;
}

form2.Hide(); f1.Show(); // Whenever you wanna go back

hope this helps !

Heath Stewart30-Dec-03 5:10

30-Dec-03 5:10

Perhaps a better way is to take a lesson from the way property pages work within a property sheet in Windows (and a lot of other implementations I've seen): instead of using multiple forms, use one form with the Previous and Next buttons (or whatever you want to call them), along with a collection of user controls that represent the property pages. You can code the logic in the form to add and remove the controls when you click the Previous or Next buttons by adding and removing them from the container (perhaps use a Panel above the buttons). The buttons could also be disabled or hidden when you reach the beginning or the end of the collection of pages.

There's many ways to evolve this method, but it's pretty much done the same way in Windows. If you've done any Win32 programming, take a look at the documentation for the IPropertyPage interface. There's links to other helpful documentation in there. You could use a similar mechanism where the controls you will host must implement a similar interface in order for them to communicate with the property sheet (same goes for a Wizard, actually, like you're doing), or for the property sheet to abstractly communicate with them (through this IPropertyPage-like interface) without knowing specific types.

There should be several articles here on CP that outline this approach. Just search for "wizard" or "property pages" or something like that. You could also try google to find some examples.

Hayat31-Dec-03 16:12

Hayat

31-Dec-03 16:12

Thanks
It worked to some extend but i still want to some thing
Suppose that currently i am on form2 which u call f2 and i press the back button it should move to the currently running form1 but how to refer to the
currentl running form1.
Because in Main method
Application.run(new Form1);

creates an object but has no name to refer to

Any idea .
Thanks for u r help.