System Language - C# Discussion Boards

shaikhooo17-Aug-07 14:23

17-Aug-07 14:23

i know C# , now i decide to develop a oscilloscope using C#
can someone tell me which namespaces to use and how to start
i have visual studio 2003

Re: graphics in C#

Luc Pattyn17-Aug-07 14:33

Luc Pattyn

17-Aug-07 14:33

is this your first project? if so, I suggest something simpler.
if you ever did a Windows app, you would already know several System namespaces.

And how do you expect to get your input, the waveforms you are going to show?

Did you search CodeProject for oscilloscope? there are a dozen hits.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google

Role based security

MBursill17-Aug-07 13:39

MBursill

17-Aug-07 13:39

I'm playing around with the MMC Authorization Manager attempting to setup some role based security for a new project.

The software I'm developing is for a smaller sized businesses. We're the type of place where one day the operations manager is filling the shoes of the accountant because the accountant called in sick, or is on vacation. As a result, my system needs to be flexible when it comes to authorization.

I can foresee situations where I may want to allow tasks for a user without necessarily making them part of a role (that would expose everything).

Sure I could make additional roles that add only the tasks a specific user may need. If I end up with a lot of specialized cases (which I might) that gets ugly to manage. I really don't want the system to become a nightmare of single-case roles each with one or two users.

Has anyone encountered this type of scenario and what was done about it?

Also, before the flames start, I realize my question isn't directly related to C# but since there is no security group (And my app is going to be written in C#) this seems the least off topic place to post.

Thanks Smile | :)

-Mike.

Handling large blocks of memory in C#

sbpont17-Aug-07 11:40

sbpont

17-Aug-07 11:40

I have an object containing a lot of data and I am moving it from one System.Collections.Generic.Queue to another. I actually have a lot of these objects and I am moving them around from Queue to Queue.

I assume that the act of removing the object from one Queue and adding it to another copies the entire object (at least once per move) and I am worried about the overhead incurred by this. Is there a way to allocate these large buffers of memory by myself and free them when I'm done so they don't keep getting copied from place to place? Is this a case where I have to use unsafe code?

Re: Handling large blocks of memory in C#

Luc Pattyn17-Aug-07 11:46

Luc Pattyn

17-Aug-07 11:46

Hi,

I think you are completely wrong about this; if you create an object, you
allocate some memory and get a reference, that's what the "new" keyword does for you.
Think of the reference as a pointer, if that suits you.

You now can copy that reference, you now have to variables referencing the same
object; no data got copied, it is just the pointer value that got copied.

You can store a reference in a collection (an array, a List, a Queue, whatever),
that does not move any data, it simply copies the pointer.

Things would be different if you were to serialize your object, e.g. because
you want to pass it to another AppDomain, or to another machine entirely.
But as long as your object stays inside an AppDomain, no data gets copied.

As a final test, you can do the following:

byte[] bigArray=new byte[100*1024*1024];  // that's 100 MB
ArrayList list=new ArrayList();
for (int i=0; i<1000; i++) list.Add(bigArray);

The above creates a 100MB array, then stores it 1000 times in a list.
Did that require 100GB of RAM?
Run it with a stopwatch; could you get that amount of data copied in that short
a time?
Don't think so.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Re: Handling large blocks of memory in C#

Guffa17-Aug-07 12:37

Guffa

17-Aug-07 12:37

sbpont wrote:
I assume that the act of removing the object from one Queue and adding it to another copies the entire object

Not at all. The only thing that you are moving is a reference. On a 32 bit system that is only four bytes.

There is no automatic copying of objects in .NET. If you want to create a copy of an object, you have to explicitly do so.

---
single minded; short sighted; long gone;

Print contents of a textbox

LCI17-Aug-07 10:25

LCI

17-Aug-07 10:25

I have a c# application that i am attempting to print the contents to a printer.. I basically have a form with a print button on it. I was attempting to investigate the functionality, but am a little confused. Does anyone have any sample code that would print the contents of a textbox to a printer?

System Language

Thaer Hamael17-Aug-07 10:00

Thaer Hamael

17-Aug-07 10:00

Hi all
I wount to Convert the system language(OS Language) as convert from English to Arabisc by C# Coding
the changing not in interface of windos But it is in the Text Writing Language
I means I wont to
write in textbox1 in English language
and in TextBox2 in Arabic Language
the language is convert Aotomatic When the Carsur is Changed from textbox1 to textbox2
this chang is done by Coding in C#

Who I Can do this Ieda's
thanks for any body help me

Thaer

Re: System Language

snorkie17-Aug-07 10:19

snorkie

17-Aug-07 10:19

Thaer,

it sounds like you use to need a web tool like http://babelfish.altavista.com/. Your C# code would have to call the translation engine and place the results in the second text box.

hogan

Licensing Software

snorkie17-Aug-07 8:08

snorkie

17-Aug-07 8:08

Have any of you out the had good success with a licensing vendor? I'm currently evaluating different vendors and have not had much luck getting decent reviews. I should mention that we don't have time and management does not want to write our own.

Currently looking at
Nalpeiron
SentinelRMS
Logic Protect

If I'm missing any vendor I should look at, please let me know. The vendors I have listed seem to have good features, but I'm curious of your experience!

Thanks!

Hogan

Re: Licensing Software

Luc Pattyn17-Aug-07 8:30

Luc Pattyn

17-Aug-07 8:30

Our company has been using Wibu[^] products for several years now. AFAIK they are the number 1 in Europe.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Re: Licensing Software

snorkie17-Aug-07 8:46

snorkie

17-Aug-07 8:46

Thanks Luc. I just called and talked to them. I should have mentioned that I'm interested in software based protection. The sales guy I talked to said that they are only hardware based protection.

Hogan

Re: Licensing Software

Luc Pattyn17-Aug-07 9:11

Luc Pattyn

17-Aug-07 9:11

Good luck then.

Luc Pattyn [Forum Guidelines] [My Articles]

Question in Maths Operator?

Khoramdin17-Aug-07 7:57

Khoramdin

17-Aug-07 7:57

Hello everyone,

I need your help in finding a Maths Operator. This is what I am looking for:

int A = 5;<br />
int B = 3;<br />
<br />
Double C = A % B; // This will give me the reminder 2<br />
Double D = ?????? // Is there any operator that I can use to get the quotient 1<br />

I know that I can use the reminder and calculate the quotient. But I was wondering if there is an operator which I can use to avoid the mathematically calculating the quotient.

Thank you very much and have a great day.

Khoramdin

Re: Question in Maths Operator?

Hessam Jalali17-Aug-07 8:02

Hessam Jalali

17-Aug-07 8:02

Because both A and B are integers a simple division would give it to you but generally you can use Casting to do that

double q=(int)(A/B);

good luck

Re: Question in Maths Operator?

Luc Pattyn17-Aug-07 8:20

Luc Pattyn

17-Aug-07 8:20

Hi,

if A and B are both integer types (i.e. not float, not double), then A/B will
yield the integer quotient; you can store that in an integer variable, but also
in a float/double, without cast. Hence double q=A/B;

But as soon as one of the operands is a real number, the real quotient will be
calculated.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

runat="server"

TAREQ F ABUZUHRI17-Aug-07 7:06

TAREQ F ABUZUHRI

17-Aug-07 7:06

Using themed css files requires a header control on the page. (e.g. ).
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: Using themed css files requires a header control on the page. (e.g. ).

Palestine

Re: runat="server"

TAREQ F ABUZUHRI17-Aug-07 7:06

TAREQ F ABUZUHRI

17-Aug-07 7:06

how can avoid this Error

Palestine

Re: runat="server"

Guffa17-Aug-07 7:21

Guffa

17-Aug-07 7:21