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Problem with C# program on Win98
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komisacroS (VIP)
I've made a simple program that reads some information from some html files
and prints the result (a text) on the printer. The problem is when it tries
to print the text.
I've used VS Enterprise Architect (the 1st version I think) with .NET
Framework v.1.0, installed on Win2000 OS.

The program works just fine on the system I've created it, but if I copy it
on a Win98 OS (on which I have the same version of .NET Framework installed)
it crashes.

The program has a Form with a PrintPreviewController and it crashes when the
method ShowDialog() of this form is executed the error message in this case
is:

"System.NullReferenceException: Object reference not set to an instance of
an object.
at System.Windows.Forms.PrintPreviewControl.CalculatePageInfo()
at System.Windows.Forms.Control.InvokeMarshaledCallbacks()"

If I take out the Form with the PrintPreviwCOntroller and I call
PrintDocument.Print() when a button is pressed (from another form) I get the
error message:
"System.NullReferenceException: Object reference not set to an instance of
an object.
at System.Windows.Forms.BackgroundThread.UpdateLabel()
at
System.Windows.Forms.PrintControllerWithStatusDialog.OnStartPage(PrintDocument document, PrintPageEventArgs e)
at System.Drawing.Printing.PrintController.PrintLoop(PrintDocument
document)
at System.Drawing.Printing.PrintController.Print(PrintDocument document)
at System.Drawing.Printing.PrintDocument.Print()
at Ordonator.Printer.Print(String[] lin, Form parent)
at Ordonator.FOrdonator.button4_Click(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons
button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg,
IntPtr wparam, IntPtr lparam)"

I think that is the same error because the PrintControllerPreview uses the
Print method from the PrintDocument.

The strange thing is that this error doesn't occur all the time on the Win98
OS (never on the Win2000) and more often it occurs when a dot matrix printer
is the default printer of the system. So, from time to time the program works
on the Win98 too.
I've tried to run the program on another system with Win98 OS, it crashed
but there was another exception:
System.ArithmeticException: Overflow or underflow in the arithmetic operation.
at System.Drawing.Font.Initialize(FontFamily family, Single emSize,
FontStyle style, GraphicsUnit unit, Byte gdiCharSet, Boolean gdiVerticalFont)
at System.Drawing.Font..ctor(String familyName, Single emSize, FontStyle
style, GraphicsUnit unit, Byte gdiCharSet)
at Ordonator.PrinterDialog.InitializeComponent()
at Ordonator.PrinterDialog..ctor(PrintDocument pd, Printer pr)
at Ordonator.Printer.Print(String[] lin, Form parent)
at Ordonator.FOrdonator.button4_Click(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons
button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg,
IntPtr wparam, IntPtr lparam)

I hope that you can help me.

If you want you can find the program at:
http://www.scs.ubbcluj.ro/~cf29359/Programe/Ordonator/Ordonator.zip
and the html files that it reads at
http://www.scs.ubbcluj.ro/~cf29359/Programe/Ordonator/exHtml.zip
The GUI is in romanian, but is easy to use press the only active button then
select some html file from exHtml.zip and then press "ORDONEAZA" button. The
error occurs when you try to print the result pressing "Listeaza rezultat".

Thank you for your time.
Reply to this message...
 
    
Stu Smith
"komisacroS" <Click here to reveal e-mail address> wrote in message
news:Click here to reveal e-mail address...
> I've made a simple program that reads some information from some html
files
> and prints the result (a text) on the printer. The problem is when it
tries
[Original message clipped]

nt document, PrintPageEventArgs e)
[Original message clipped]

I've seen the second trace (overflow/underflow) before on a Win98 machine.
We traced the issue to differences in printer driver. Can't remember the
exact details, but it was one particular printer, and one particular version
of the printer driver. You could try looking for a newer (or older) version
of the printer driver, or changing between the manufacturer one and the MS
one.

There's quite a bit of info on Google Groups, eg:

http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&threadm=022401c340d5%24bbd954e0%24a501280a%40phx.gbl&rnum=1&prev=/groups%3Fq%3Doverflow%2520underflow%2520Printer%2520Dialog%26hl%3Den%26lr%3D%26ie%3DUTF-8%26sa%3DN%26tab%3Dwg

http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&threadm=416d01c2b9ea%24dea0c840%2489f82ecf%40TK2MSFTNGXA01&rnum=3&prev=/groups%3Fq%3Doverflow%2520underflow%2520Printer%2520Dialog%26hl%3Den%26lr%3D%26ie%3DUTF-8%26sa%3DN%26tab%3Dwg

(watch that wrapping).

Stu
Reply to this message...
 
    
komisacroS (VIP)
Thank you for your post.
I have read the posts indicated by you and I have followed the indications
given there but it didn't solve my problem.
I thing that my problem is different form the one discused in that posts. I
have mentioned in my first post that only on another system (where there is a
HP printer) I recieve the overflow/underflow error. After I modified my
program folowing that indications I recieve only the first 2 errors on any
Win98 system with HP, Epson or Lexmark printers. So, I thing I solved only
the problem regarding HP printers.

"Stu Smith" wrote:

[Original message clipped]
Reply to this message...
 
 
System.ArithmeticException
System.Drawing.Font
System.Drawing.FontFamily
System.Drawing.FontStyle
System.Drawing.GraphicsUnit
System.Drawing.Printing.PrintController
System.Drawing.Printing.PrintDocument
System.Drawing.Printing.PrintPageEventArgs
System.EventArgs
System.IntPtr
System.NullReferenceException
System.Windows.Forms.Button
System.Windows.Forms.ButtonBase
System.Windows.Forms.Control
System.Windows.Forms.MouseButtons
System.Windows.Forms.MouseEventArgs
System.Windows.Forms.NativeWindow
System.Windows.Forms.PrintControllerWithStatusDialog
System.Windows.Forms.PrintPreviewControl




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