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Printing from a WebForm in C#/ASP.Net

15-Apr-03 19:00

try
Give Your .NET-based Application a Fast and Responsive UI with Multiple Threads by Ian Griffits

Vasudevan Deepak Kumar15-Apr-03 1:20

Vasudevan Deepak Kumar

15-Apr-03 1:20

Hi,

I am trying to print on serverside using C# on a WebForm. When I called the Print() of PrintDocument, I am getting the error

'No Printers Installed'. Perhaps this was because of different account with which it was running. I made impersonate true in web.config and in the class constructor did the following:

   int userAuthToken = 0;
  LogonUser("deepak","DeepakWorld","monkey",8,0,out userAuthToken);
  WindowsIdentity.Impersonate(new IntPtr(userAuthToken));
System.Diagnostics.Trace.Write(WindowsIdentity.GetCurrent().Name);
  where LogonUser is the method in advapi32.dll

Before print, when I queried the CurrentIdentity, it revealed and confirmed that it was running DeepakWorld/deepak. But still it is saying 'No Printers installed' I have printers installed.

When I directly asked it to print using

print.PrinterSettings.Printer = @"\\Kennel\GP142";

it says:

Tried to access printer '\\Kennel\GP142' with invalid settings.

Please advise on how to print from a WebForm.

Deepak Kumar Vasudevan
http://deepak.portland.co.uk/

Maximizing Event (Or Not)

Adam Turner15-Apr-03 0:49

Re: Maximizing Event (Or Not)

15-Apr-03 0:49

What is the event that is fired when maximizing a form? or minimizing for that matter.

I currently have put a delegate on the Resize event and checking for FormWindowState.Maximized.

Is this the only way of doing it? or even the correct way?

Basically i dont want to actually maximize my form. I want to change its height to a certain value while not changing the top and left of the form. But the WindowsState is only changed to FormWindowState.Maximized when the form is actually maximized and not before when it starts.

Any help is appreciated.

--ABT

Srinivasa Raghavan15-Apr-03 1:46

Srinivasa Raghavan

15-Apr-03 1:46

Hi
I had the same problem. .NET doesent raises any specific event when the windowState of a form changes except the resize event. Else u can catch the WM_XXX message in "WndProc" method

Thanks Smile | :)

Srinivas

Re: Maximizing Event (Or Not)

Adam Turner15-Apr-03 18:46

Generating random number of fixed-size

15-Apr-03 18:46

Thanks but i have never overriden this method before. Where do i get the values of WM_XXX and other message constants?

Gerry14-Apr-03 21:45

Gerry

14-Apr-03 21:45

Hi,
I want to generate a random number of fixed-size for passwords.

The size of the password must be 8 digits.

I'm using c#, .net 1.1

Cheers

Gerry.

Nnamdi Onyeyiri14-Apr-03 23:42

Nnamdi Onyeyiri

14-Apr-03 23:42

Random rand = new Random();
string pwd = rand.Next(10000000, 99999999).ToString();

that should do the trick.

| Website: http://www.onyeyiri.co.uk
| Sonork: 100.21142 : TheEclypse
| "If a dolar was a chicken would the chicken be evil?"

Nick Seng14-Apr-03 23:46

14-Apr-03 23:46

DUH

I thought of doing that with int, but the size would be too large. So I thought of using an int array

Should've thought of using string instead

::Incredibly embarrased::

Notorious SMC

The difference between the almost-right word & the right word is a really large matter - it's the difference between the lightning bug and the Lightning
Mark Twain

Get your facts first, and then you can distort them as much as you please
Mark Twain

Nnamdi Onyeyiri14-Apr-03 23:49

Nnamdi Onyeyiri

14-Apr-03 23:49

but the two parameters sent to Random.Next are int's, i checked the max value of int's just a minute ago using the Int32.MaxValue property, and it had more than 8 digits in it, i only converted it to string because it was a password.

| Website: http://www.onyeyiri.co.uk
| Sonork: 100.21142 : TheEclypse
| "If a dolar was a chicken would the chicken be evil?"

Nick Seng14-Apr-03 23:53

14-Apr-03 23:53

I'm just embarassing myself more and more, aren't I? Blush | :O

For a minute there, I was using Int16 ?!?!

Notorious SMC

Nick Seng14-Apr-03 23:43

14-Apr-03 23:43

Create an int array of size 8, and assign a random number(range 0 to 9) for each int.

Notorious SMC

Gerry15-Apr-03 0:15

Gerry

15-Apr-03 0:15

Thanks for replying. But this random number generator isn't as secure as cryptography RGN's.

Something like the RandomNumberGenerator class.

Cheers,
Gerry.

Gerry.

C# and excel

Marix14-Apr-03 20:37

Marix

14-Apr-03 20:37

In my windows application I need to open Excel application in background and read some data from excel files.
What I do is
Excel.ApplicationClass excelApp = new Excel.ApplicationClass();

Excel.Workbook WB;

excelApp.Visible = false;

Then I open workbook:

WB = excelApp.Workbooks.Open(filename,System.Type.Missing,System.Type.Missing,System.Type.Missing,System.Type.Missing,System.Type.Missing,System.Type.Missing,System.Type.Missing,System.Type.Missing,System.Type.Missing,System.Type.Missing,System.Type.Missing,System.Type.Missing,System.Type.Missing,System.Type.Missing);

And now I want to read some data from this excel file. In access I did it in this way: WB.Names("name1").refersToRange.Cells(1,1), but here in C# there is no such method Cells(string Name), so I don't know how to access cell value in given Excel name????

Can anyone help me?

I am using office XP!

Re: C# and excel

Nick Seng14-Apr-03 23:38

Powering through statements

14-Apr-03 23:38

I had this same problem a while ago, and the solution I used was:

Assign the refering name to a variable

String sRef = (String)(nm.RefersToR1C1).Split("!"c)
which will get you something like "RxCy" where X is the row number and y is the Column number. Extract those value out, then

String Value = (String)WB.Sheets(sheetname).Cells.Item(row,col)

It's a long way to do it, but until Office 11 comes out, it's the only way I know

Notorious SMC

Re: C# and excel

Chris Austin15-Apr-03 5:16

Chris Austin

15-Apr-03 5:16

Hey Marix, check out the link below. It is a very through look at automating office using .net and C#

http://www.gotdotnet.com/Community/UserSamples/Details.aspx?SampleGuid=b7df82d9-3619-465a-bc28-c6f0d2c5fdfd[^]

Hey don't worry, I can handle it. I took something. I can see things no one else can see. Why are you dressed like that?
- Jack Burton

Adam Turner14-Apr-03 14:28

Re: Powering through statements

14-Apr-03 14:28

Basically, i dont care if a set of statements throws an exception but i dont want the program flow to be interupted. How can i do this? Something like the following:

int[] manyInts = new int[4];<br />
manyInts[0] = 1;<br />
manyInts[1] = 1;<br />
manyInts[2] = 1;<br />
manyInts[3] = 1;<br />
manyInts[4] = 1;<br />
manyInts[5] = 1;

So basically it executes every statement whether it thows an exception or not.

-- ABT

Jim Stewart14-Apr-03 17:43

Jim Stewart

14-Apr-03 17:43

How about:

try //Outside try block to handle initialization and leave the array visible	
{
    int[] manyInts = new int[4];

    try {manyInts[0] = 1;} 
    catch {/*Empty catch block does nothing*/}

    try {manyInts[1] = 1;} 
    catch {}

    try {manyInts[2] = 1;}
    catch {}

    try {manyInts[3] = 1;}
    catch {}

    try {manyInts[4] = 1;}
    catch {}

    try {manyInts[5] = 1;}
    catch {}
}
catch {}

...Powerful kludgy - but should work

α.γεεκ

Fortune passes everywhere.
Duke Leto Atreides

Re: Powering through statements

Adam Turner14-Apr-03 17:49