C# Discussion Boards - CodeProject

MadsJ24-Jul-03 3:13

24-Jul-03 3:13

Hi
We would like to be able to use the different hardware fonts that exists on most printers, when we use the windows driver "Generic / Text Only" *.

We have written some code that enables us to write text to a "Generic / Text Only" (GTO) printer, but despite many attempts we haven't been able to change the font.

For writing text we use the importer legacy function WritePrinter().

Any ideas?

*) We have to use this driver since we also want to use our code for POS printers etc.

Mads

Re: Generic / Text Only print

Ista24-Jul-03 6:52

Ista

24-Jul-03 6:52

use the printing events. I cant remember the name but an event rises before it starts a print. you can then query for the selected fonts like a font-family in html

Re: Generic / Text Only print

MadsJ24-Jul-03 19:41

MadsJ

24-Jul-03 19:41

Since .NET print any stuff as graphics, the standard .NET printing mechanism doesn't work with a "generic / text only" printer.

Having tried it anyway, we found out that it didn't raise the event (and the code was ok - the event was raised if we choose any other printer).

Personally, I think we have to use some escape sequences - but I haven't been able to find out how to write them.

Thanks for your reply.

Mads

Re: Generic / Text Only print

J. Dunlap24-Jul-03 20:13

J. Dunlap

24-Jul-03 20:13

Perhaps you'll have to use the Windows printer API.

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Re: Generic / Text Only print

Ista25-Jul-03 4:15

Ista

25-Jul-03 4:15

Have you tried crystal reports. I had the same issue with off brand printers. Crystal prints as graphics yes but it can be switched to character printing

Process Monitoring

vikramlinux24-Jul-03 1:56

vikramlinux

24-Jul-03 1:56

Is there any Method/utlity/Class which can help me in process Monitoring? Startup/Exit/busy etc status..

VikramS

Re: Process Monitoring

Tom Archer24-Jul-03 2:18

Tom Archer

24-Jul-03 2:18

Take a look at the System::Diagnostics.Process class:

Exit Notification -> Process.EnableRaisingEvents
Enumerating running processes -> Process.GetProcesses
Finding processes - > Process.GetProcessByName
Alive? -> Process.Responding

That should get you started in the right direction.

Cheers,
Tom Archer
Inside C#,
Extending MFC Applications with the .NET Framework
It's better to listen to others than to speak, because I already know what I'm going to say anyway. - friend of Jörgen Sigvardsson

Create Bitmap and LockBits

novachen24-Jul-03 0:51

novachen

24-Jul-03 0:51

Hi! I try to create a target bitmap alike the source bitmap ( in size, in pallete). I hope the target bitmap will be created black(or 0) on every pixel. And then program generate the content of target according to the source one, if some pixel isn't be filled it will be still black.

first trial:

dst = (Bitmap)src.Clone();
BitmapData bmSrcData = src.LockBits(new Rectangle(0, 0, src.Width, src.Height), ImageLockMode.ReadWrite, PixelFormat.Format8bppIndexed);
BitmapData bmDstData = dst.LockBits(new Rectangle(0, 0, dst.Width, dst.Height), ImageLockMode.ReadWrite, PixelFormat.Format8bppIndexed);
//do some processing on BitmapData

This one work! but it seems clone waste much on copying the content. i wanna it be black, so i have to fill it 0 myself. copy and fill are useless duplicate work.

Second trial:
dst = new Bitmap(src.Width, src.Height, src.PixelFormat);
BitmapData bmSrcData = src.LockBits(new Rectangle(0, 0, src.Width, src.Height), ImageLockMode.ReadWrite, PixelFormat.Format8bppIndexed);
BitmapData bmDstData = dst.LockBits(new Rectangle(0, 0, dst.Width, dst.Height), ImageLockMode.ReadWrite, PixelFormat.Format8bppIndexed);

dst will not has the same palette as src. After the process, dst will be a color image even src is a formerly gray one.

Third one:
dst = new Bitmap(src);
BitmapData bmSrcData = src.LockBits(new Rectangle(0, 0, src.Width, src.Height), ImageLockMode.ReadWrite, PixelFormat.Format8bppIndexed);
BitmapData bmDstData = dst.LockBits(new Rectangle(0, 0, dst.Width, dst.Height), ImageLockMode.ReadWrite, PixelFormat.Format8bppIndexed);

can't execute! the second LockBits will raise error. anybody know why?

I really puzzled by these methods! any guru can explain what's on earth are these create functions doing? and what's the best way to get my aim?

Re: Create Bitmap and LockBits

leppie24-Jul-03 7:26

leppie

24-Jul-03 7:26

novachen wrote:
can't execute! the second LockBits will raise error. anybody know why?

It appears that dst and src might be the same instance, and thus cannot be locked twice. My guess Poke tongue | ;-P

Unfortunately I cant help you with the others...

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

how to add component????

don7cry24-Jul-03 0:46

don7cry

24-Jul-03 0:46

How to add my componet in to VS.NET (like that Visual Assist)??
Someone can help me, please!!!
Thanks

function parameter with default value

zecodela23-Jul-03 23:17

zecodela

23-Jul-03 23:17

hi,
i want to know how to make a function including a parameter with default value?
somethings like this...

public void functionA(int A, int B = NULL)
{
// ...
}

any help?

thanks,
jim

Re: function parameter with default value

monrobot1324-Jul-03 2:37

monrobot13

24-Jul-03 2:37

zecodela wrote:
i want to know how to make a function including a parameter with default value?

As far as I know you can't have default parameters in managed functions.

- monrobot13

Re: function parameter with default value

Frank Olorin Rizzi24-Jul-03 3:26

Frank Olorin Rizzi

24-Jul-03 3:26

Indeed,
the word I've read everywhere in this regard is that you should use multiple
versions of the member. For ex:
instead of

<br />
public void myFunction(int myInt = 3)<br />
{...}<br />

you should have

<br />
public void myFunction(int myInt)<br />
{<br />
//use myInt as needed<br />
}<br />

AND

<br />
public void myFunction()<br />
{<br />
//use 3 (the default value) as needed<br />
}<br />

Also, you could have one overload call the other:

<br />
public void myFunction(int myInt)<br />
{<br />
//use myInt as needed<br />
}<br />

AND

<br />
public void myFunction()<br />
{<br />
  myFunction(3);<br />
}<br />

HTH,
FOR

Re: function parameter with default value

Tom Archer24-Jul-03 7:13

Tom Archer

24-Jul-03 7:13

Frank is almost correct. You can have functions/methods with default values in some managed languages, but not in C#. His advice on how to circumvent (what I personally see as a) shortcoming in the C# language is correct: Have overloaded versions of the method as follows:

public void foo (int a); // call third foo with default values
public void foo (int a, int b); // call third foo with default values
public void foo (int a, int b, int c);

Cheers,
Tom Archer
Inside C#,
Extending MFC Applications with the .NET Framework
It's better to listen to others than to speak, because I already know what I'm going to say anyway. - friend of Jörgen Sigvardsson

Re: function parameter with default value

leppie24-Jul-03 7:30

leppie

24-Jul-03 7:30

Tom Archer wrote:
public void foo (int a); // call third foo with default values
public void foo (int a, int b); // call third foo with default values
public void foo (int a, int b, int c);

OK, this is a bit picky, but shouldnt the 1st function call the second? As one would design constructor overloads?

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

Re: function parameter with default value

Tom Archer24-Jul-03 7:36

Tom Archer

24-Jul-03 7:36

You're right....it's picky Smile | :)

Seriously, it depends on your point of view. From a code maintenance standpoint, I would agree with you. But from a performance standpoint it would mean an extra call in the code path.

Personally, I code as you mentioned because I worry more about maintenance than the incredibly small performance hit of an in-proc function-to-function call.

Cheers,
Tom Archer
Inside C#,
Extending MFC Applications with the .NET Framework
It's better to listen to others than to speak, because I already know what I'm going to say anyway. - friend of Jörgen Sigvardsson

Re: function parameter with default value

leppie24-Jul-03 8:17

leppie

24-Jul-03 8:17

Tom Archer wrote:
But from a performance standpoint it would mean an extra call in the code path.

Thats where a preprocessor for C# will be nice, I miss #define 's especially those mid function ones. Smile | :)

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

Re: function parameter with default value

Tom Archer24-Jul-03 8:19

Tom Archer

24-Jul-03 8:19

Yep. Me too. That's why I'm slowly navigating back to MC++ for most of my development. I have done some cool C# stuff - even won a Money Magazine technical award a couple of months ago for a C# system I designed and wrote for VeriSign - but for my personal work, I choose MFC/MC++.

Cheers,
Tom Archer
Inside C#,
Extending MFC Applications with the .NET Framework
It's better to listen to others than to speak, because I already know what I'm going to say anyway. - friend of Jörgen Sigvardsson

Re: function parameter with default value

Nemanja Trifunovic24-Jul-03 10:01

Nemanja Trifunovic

24-Jul-03 10:01

Tom Archer wrote:
But from a performance standpoint it would mean an extra call in the code path.

Doesn't the compiler take care of it?
Tom Archer wrote:
Personally, I code as you mentioned because I worry more about maintenance than the incredibly small performance hit of an in-proc function-to-function call.

Exactly.

Re: function parameter with default value

Tom Archer24-Jul-03 10:38

Tom Archer

24-Jul-03 10:38

Nemanja Trifunovic wrote:
Doesn't the compiler take care of it?

How do you mean? It's still a jump with the extra prolog and epilogue instructions to take care of the stack.

Cheers,
Tom Archer
Inside C#,
Extending MFC Applications with the .NET Framework
It's better to listen to others than to speak, because I already know what I'm going to say anyway. - friend of Jörgen Sigvardsson

Re: function parameter with default value

Nemanja Trifunovic24-Jul-03 12:04

Nemanja Trifunovic

24-Jul-03 12:04

Yes, but since foo(a) always calls foo(a,b,c), the compiler can simply inline every call to foo(a). When you call foo (a), it can push additional two parameters on stack and call foo (a,b,c) directly.

XML selialize

Mazdak23-Jul-03 22:04

Mazdak

23-Jul-03 22:04

I have a XML file like this:

- <Quiz Id="1" Date="24.07.2003">
- <Question Text="Question Text 1" Choice="a">
<Answer>text a1</Answer>
<Answer>text b2</Answer>
<Answer>text c3</Answer>
<Answer>text d4</Answer>
</Question>
- <Question Text="Question Text 2" Choice="b">
<Answer>text a1</Answer>
<Answer>text b2</Answer>
<Answer>text c3</Answer>
<Answer>text d4</Answer>
</Question>
</Quiz>
I want to serialize and deserialize it into a class and from that class. So my class have should have some XmlElements and XmlAttribute, But I don't know what my class should look like?

I should have XmlElement name Question, but how can I define that some attributes are for Quiz node and some for Question,and don't know about Answer node too.Because It could be for item or 3 or...
Another question is that maybe I have 3 or 4 or only 1 Question node in my XML file so how should I deal with it in my class? When I serialize it what should I concern?

Any comment is appreciated.

<html><b><FONT face="Lucida Handwriting, Cursive">Mazy

No sig. available now.
<FONT></b></html>

Re: XML selialize

pseudonym6724-Jul-03 7:15

pseudonym67

24-Jul-03 7:15

declare the class something like

[ XmlRootAttribute( ElementName = "classname" ) ]
public class classname

and look up the class XmlSerializer

it would probably be best to store the answer in an array.

pseudonym67

Neural Dot Net Articles 1-11 Start Here[^]

ToolTip on GDI+ figure

r923-Jul-03 21:13

23-Jul-03 21:13

It is possible to put a tooltip on a GDI+ figure? (on mouseOver)

The tooltip1.SetToolTip() method takes in a System.WindowsForms.Control, but there is no overload for a GDI drawing ?

Re: ToolTip on GDI+ figure

Valeria Bogdevich23-Jul-03 23:15

Valeria Bogdevich

23-Jul-03 23:15

1). Declare global variables ToolTip tt; and bool installed = true;

2). Initialize tt in constructor of the form: tt = new ToolTip()

3). Override OnMouseMove:

protected override void OnMouseMove(System.Windows.Forms.MouseEventArgs e)
{
    if (bounds.Contains(e.X, e.Y))
    {
	this.Cursor = Cursors.Hand;
	if (installed)
	{
	    tt.SetToolTip(this, "Hello, r9 :o)");
	    installed = false;
	}
    }
    else 
    {
	this.Cursor = Cursors.Default;
	if (!installed)
	{
	    tt.RemoveAll();	
	    installed = true;
	}
    }
    base.OnMouseEnter(e);
}

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