|
Hi.
I'm trying to send text to a Epson TM-T88II Reciept printer. the printer is installed as a system printer on win XP.
I've got some drivers from their homepage wich i got to work. the performance however is not acceptable (~30 sec for 20 centimeters).
I tried printing a windows testpage with the MS Generic/Text Only driver. this took ~1 (one!) second for 30 centimeters. So i naturally want to use this driver.
BUT (there is always a 'but'...) When i try to print in my program i get this error:
"The data area passed to a system call is too small".
this is kind of strange since the program has not reacht my printpage event yet....
The program generates the error in system.drawing.printing.OnStartPrint (or something like that) which has nothing to do with anything.. :-/
i've i try a different driver I do not get this error.
I've looked a bit around the web and seen others with similar probs but no solution.
Can anyone help me?!!
here's my code:
---------------------------------
public void PrintBon()
{
try
{
//for text
m_printBon = new PrintDocument();
m_printBon.PrintPage += new PrintPageEventHandler
(this.printBon_PrintBon); <--- Error occurs here. before the program goes to my PrintBon event.
m_printBon.Print();
}
catch(Exception ex)
{
throw ex;
}
}
private void printBon_PrintBon(Object sender, PrintPageEventArgs ev)
{
ev.Graphics.DrawImage(logo, 80, 0, 130, 50);
ev.Graphics.DrawString(m_printString, m_printFont, Brushes.Black, 0, 60);
ev.HasMorePages = false;
}
----------------------
|
|
|
|
|
apparently .NET only sends Graphics to a printer. therefore the Generic/text only driver cant accept the input.
I found a tutorial on how to send raw data to a printer.
http://support.microsoft.com/default.aspx?scid=kb;EN-US;322091
|
|
|
|
|
I want to call a method clear on an object. I know it has the clear method but I dont what class it is
do i use method info class?
|
|
|
|
|
You could use Reflection and the MethodInfo type, however, are you sure that the object doesn't implement an interface that has the Clear method? In that case, you could cast the object to the interface and then call the method based on the interface. Otherwise, how do you know the object implements Clear()?
Hawaian shirts and shorts work too in Summer.
People assume you're either a complete nut (in which case not a worthy target) or so damn good you don't need to worry about camouflage...
-Anna-Jayne Metcalfe on Paintballing
|
|
|
|
|
Well I created the class and they all have base classes. I could create a default interface but I didn't really feel like doing it.
|
|
|
|
|
Then you could cast the object to the base class before calling the method. That should work, and it'll also give you intellisense in VS.NET.
Hawaian shirts and shorts work too in Summer.
People assume you're either a complete nut (in which case not a worthy target) or so damn good you don't need to worry about camouflage...
-Anna-Jayne Metcalfe on Paintballing
|
|
|
|
|
int done;
....
if(done)
break;
It been a long time since i've done C++ but what is the correct statement in C#?
???
if(1 == done)
break;
if(0 != done)
break;
???
|
|
|
|
|
C# and C++ have the same syntax. You can use it in C# too.
if(done)
break;
is correct for both.
Mazy
No sig. available now.
|
|
|
|
|
Visual Studio .NET considers the code to be an error:
Cannot implicitly convert type 'int' to 'bool'
|
|
|
|
|
You didn't say it returns int value. Cast it too bool.
if((bool)done)
...
Mazy
No sig. available now.
|
|
|
|
|
well the casting still throws up the same error
Cannot convert type 'int' to 'bool'
any hoo.
what number does done have to be for it to satisfy the condition?
|
|
|
|
|
So use If(done==1) .It returns error too?
Mazy
No sig. available now.
|
|
|
|
|
more like while(true)
break;
its not a full int world anymore
|
|
|
|
|
zoltan_ie wrote:
It been a long time since i've done C++ but what is the correct statement in C#?
???
if(1 == done)
break;
if(0 != done)
break;
???
Use above lines, no problem
Don't forget, that's Persian Gulf not Arabian gulf!
|
|
|
|
|
if(done)
do1
else
do2
what number does done have to be to do1?
In C what number does done in the if statement have to be to give a true condition
|
|
|
|
|
I think if done is 0 then (bool)done is false otherwise it's true.
but, why don't you use bool data type?
private bool <code>done</code>;
done = true;
if(<code>done</code>)
do1;
else
do2;
Don't forget, that's Persian Gulf not Arabian gulf!
|
|
|
|
|
Lesson learnt from Perl:
It is easier to define "false" than "true": 0 (zero) and null are "false", everything else is true.
Olorin,
YAPPTH
|
|
|
|
|
int done;
...
if (Convert.ToBoolean(done))
break;
α.γεεκ Fortune passes everywhere.
Duke Leto Atreides
|
|
|
|
|
Why keep it an int at all?
bool done = false;
...
if( done )
break; C doesn't have a concept of a boolean so you had to use some other data type to represent one, most code uses an int to hold a boolean value. C++ has bool datatype, but since the Win32 API is C based you typically don't use it favoring an int or the #defined BOOL.
Like C++, C# has a bool data type, unlike C++ though there isn't any legacy code to be aware of so you should use it whenever necessary.
[edit]And unlike C/C++, the bool datatype has a true/false value instead of a non-zero/zero value. So you need to assign true to done instead of a 1.
James
"I despise the city and much prefer being where a traffic jam means a line-up at McDonald's"
Me when telling a friend why I wouldn't want to live with him
|
|
|
|
|
The suggestion above to use a bool is the best.
The suggestion to cast the int to a bool is silly.
By definition, a int is "true" if it does NOT equal zero. Thus you should always test against the false situation. The correct syntax of your two choices is:
if (0 != done)<br />
break;
This syntax should also be used in C# (if you don't use bool.)
|
|
|
|
|
how to detect that I just press Ctrl+Key
I was try with code :
<br />
privated void myInput_KeyDown(object sender,KeyEventArgs e)<br />
{<br />
if (e.KeyCode==(Keys.G & Keys.Control)<br />
{<br />
}<br />
}<br />
but It not run
please help me, thanks
|
|
|
|
|
Can anyone show me how to fill this figure with a blue color?
System.Drawing.Graphics formGraphics = null;
System.Drawing.Pen myPen;
formGraphics = pictureBox7.CreateGraphics();
myPen = new System.Drawing.Pen(System.Drawing.Color.Black,1);
formGraphics.DrawLine(myPen, 4, 4, 50, 4);
formGraphics.DrawLine(myPen, 4, 4, 4, 100);
formGraphics.DrawLine(myPen, 50, 4, 50, 100);
formGraphics.DrawLine(myPen, 4, 100, 27, 120);
formGraphics.DrawLine(myPen, 50, 100, 27, 120);
Maybe with the FillPolygon method.
|
|
|
|
|
Point[] points = {
new Point(4, 4),
new Point(50, 4),
new Point(50, 100),
new Point(27, 120),
new Point(4, 100),
new Point(4, 4)};
SolidBrush brush = new SolidBrush(Color.Blue);
e.Graphics.FillPolygon(brush, points, FillMode.Alternate);
e.Graphics.DrawLines(myPen, points);
|
|
|
|
|
WiB:
Thanks. It works perfekt.
How do you know in which order to put the Points??
Eks:
Point[] points = {
new Point(4, 4),
new Point(50, 4),
new Point(50, 100),
new Point(27, 120),
new Point(4, 4),
new Point(4, 100)};
Won't fill the figure correkt.
|
|
|
|
|
Because there is a rule:
You put points in the same order like it would be if you draw figure by hand without break:
you start from first point in array, draw line until second, after draw line from second point to third and so on to the last point.
And normally I start and finish points array with the same point, but it's not allways necessary.
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
