|
We are building some rather complex applications that all boil down to computational geometry on a complex collections of object. They are really extensions of 3d CAD systems into the manufacturing systems.
We are currently moving from code embedded (think plugin) in CAD system to free standing applications. As a result we really have two issues. The first is a data/object management issue because our data structures become very complex. The text version of the data can be 200+k lines long.
So for these routines, C#'s advantages of no pointers and no memory leaks (both big problems currently) will out way performance issues. The questions on performance have to do with parsing speed and dynamic memory management. Our lead programmer thinks that any system with memory garbage collection has to be too slow by definition and therefore not worth consideration.
The second is a rendering/computationally issues. These will be fairly tightly defined routines where computational speed is an issue, although a difference of 10-20% probably would not be noticed. Especially as processor speeds increase. We are also going to be recoding these for multi-core support, so ease of threading here will be an issue.
In terms of hardware, we are going to be supporting all versions from windows 2000 to vista, both 32 and 64 bit. So porting between these OSs will be a problem. I've seen an article on codeproject that goes over the coding differences between 32 and 64 bit in C++ and it looks like it will be a problem. I believe that .net does this automatically for us. And ultimately Linux, but no customers have requested it. If we limit ourselves to what MONO supports, I think this may be a solution.
This is going to be a 6-8 person project for the next couple of years. We are probably looking at 500k lines of code. So overall programmer efficiency is going to be a really big deal. At a minimum I think that we need to move to VS Team, but am going to have to get more info before I can convince the others.
Thanks for quick reply.
Tom
|
|
|
|
|
Tom Thorp wrote: no memory leaks
 Very good joke!
|
|
|
|
|
Tom Thorp wrote: no pointers and no memory leaks (both big problems currently)
Then perhaps moving to C# is a good thing. No well written C++ code will leak, at least not in ways that are 'big problems'. I worked on a 3D home design program in C++, and we didn't have any significant memory leaks.
C# does require you to manage leaks, however, especially for graphics objects.
Tom Thorp wrote: The questions on performance have to do with parsing speed and dynamic memory management. Our lead programmer thinks that any system with memory garbage collection has to be too slow by definition and therefore not worth consideration.
For a CAD system, I suspect he may be right. I have written image processing apps in C#, however, and they work just fine.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
|
|
|
|
|
Tom Thorp wrote: If we limit ourselves to what MONO supports, I think this may be a solution.
Search for threads about in on the Lounge. MONO has some fairly large sized holes in the base classes. MONO also uses GTK.net for graphics instead of trying to port winforms (too win32 centric in design). Even if none of the former are a problem for you, if a *nix port is in your likely future you'd probably do better writing the UI with GTK.net now instead of having to rewrite it later.
--
You have to explain to them [VB coders] what you mean by "typed". their first response is likely to be something like, "Of course my code is typed. Do you think i magically project it onto the screen with the power of my mind?" --- John Simmons / outlaw programmer
|
|
|
|
|
Christian Graus wrote: C++ is obviously going to be faster.
Not necessarily true, depends heavily on the implementer.
|
|
|
|
|
Hi Tom,
I understand your doubts; we had the same doubts more than ten years ago, when
we considered switching embedded system programming to Java; Java has a similar
garbage collection approach. But we did switch over, and soon we were glad we did
because of the increased programmer efficiency and code robustness.
The garbage collection concept is quite OK if you pay some attention to it.
Of course you must (continue to) care about the number of objects you create; every object
sooner or later must be retrieved to recycle the memory it was occupying.
Switching an image processing application from C++ to C# should not be seen as an
open invitation to turn every pixel into an object...
Here are some examples that limit the object generation rate:
1. when performing complex string operations (say a number of concatenations),
you will be better of using a StringBuilder.
2. short-lived objects, large or small, that only consume a limited number of CPU
cycles in their life span, need special attention, to avoid the gc effort becoming
noticeable. If you currently manage these objects yourself,
you can continue to do this, by recycling them, rather than letting them fade away.
I do not recommend you do this all the time, but when applied to a few classes at
the heart of your application domain, it may prove quite useful.
Of course these examples may seem like giving in on the advantages of C#, but that
would be true only partially and locally. It is similar to general performance optimisation:
in order to improve overall app performance, one must look for hot spots and then give in
a bit to gain some (or a lot).
Hope this may be helpful.
|
|
|
|
|
Hi All,
I have developed a windows application using serialport.
I am able to send the data to the terminal but not receiving it..
here is my code
SerialPort port = new SerialPort("COM4", 9600, Parity.None, 8, StopBits.One);
private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
port.DtrEnable = true;
port.Handshake = Handshake.RequestToSend;
txtData.Text = txtData.Text + port.ReadExisting();
}
Why i'm not able to receive data?  whats wrong in my code... Could anyone please help me on this issue...
Thanks in Advance/..
|
|
|
|
|
write instead of your code like this code.
use:
create a delegate like this:
private delegate void Update();
private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
port.DtrEnable = true;
port.Handshake = Handshake.RequestToSend;
this.invoke(new invoker Update(this.refresh));
}
private void refresh()
{
txtData.Text = txtData.Text + port.ReadExisting();
}
|
|
|
|
|
sorry this code was wrong:
write this:
private delegate void Updatedatas();
private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
port.DtrEnable = true;
port.Handshake = Handshake.RequestToSend;
this.invoke(new Updatedatas(this.refresh));
}
private void refresh()
{
txtData.Text = txtData.Text + port.ReadExisting();
}
|
|
|
|
|
Hi, Thanks for your help..
but, still it isn't receiving any thing..
could anyone plz help me to resolve this issue....
-- modified at 7:03 Wednesday 27th June, 2007
|
|
|
|
|
I think you have to set the RtsEnable flag.
port.RtsEnable = true;
try it out
|
|
|
|
|
Hi,
this is my 4-step advise to you:
1.
first make sure you dont get anything in your app: try to read one byte (a raw byte,
not a char, not a string) and show it on the Console (this avoids all GUI trouble,
crossthread problems, etc).
2.
if that fails make sure there is something to receive on the serial cable:
try another program, such as hyperterminal. As long as that does not receive anything,
check your cable, your port settings, your target device; if necessary, use
an oscilloscope or whatever to debug the hardware/firmware.
3.
Once hyperterminal shows something reasonable, return to your app.
Again I recommend reading bytes (a byte array) rather than ReadExisting()
until you start getting data, since I expect that has better chance of delevering
something (it avoids Encoding problems and the like). Check your handshaking;
and try a different one.
4.
When things are getting alive, now start reading chars and/or strings.
Remark: in another thread I got the impression serial port was NOT using ASCII encoding
by default, it seemed to be using Unicode instead.
Good hunting !
|
|
|
|
|
What do you want to pay, for somebody doing your homework?
|
|
|
|
|
i will give him 50% discount 
so what is your offer ??
When you get mad...THINK twice that the only advice
Tamimi - Code
|
|
|
|
|
You shouldn't dump the prices here on the forum!
You destroy the marked, and then one day we have to help people for free here!
|
|
|
|
|
Martin# wrote: and then one day we have to help people for free here
man not today , i need some cash 
When you get mad...THINK twice that the only advice
Tamimi - Code
|
|
|
|
|
Hi,
Can anyone of u suggest different types of containers present in c#.The containers should have a capability of withholding images,text.... and should be capable of exporting these images when required.
so pls list out all possible containers
-- modified at 2:26 Thursday 28th June, 2007
srujana
|
|
|
|
|
hi,
The richtextbox is not a container control. It renders rtf formatted text into pictures etc.
The controls that derive from ContainerControl are container controls!
Check MSDN or Reflector for containercontrol.
Gideon
|
|
|
|
|
i try to control serialport with C#.i use laptop and USB-RS232 changer.nowadays i see window's blue error screen than my laptop close.why i see this error?how can i block this?how can i correct it?
|
|
|
|
|
hi
i create an application that use crystal report for reports
when i test application in a computer that have .net has no problem, but when i run my application that has not .net (visual studio) show follow exception :
crystaldecisions.crystalreports.engine
how can correct this problem?
tanks
|
|
|
|
|
How to Create a DLL Library using C# ? The DLL be called by the C/COBOL (legacy language )?
|
|
|
|
|
I have posted this before, but now I have some more information. Many thanks to those who tried to help 1st time.
I have a windows form with a rapidly updating chart, and I want to use double buffering to prevent flicker. Without double buffering my app runs OK (apart from the flickering). With double buffering it starts up OK, but when I load the double buffered form the following occurs:-
The form loads then runs the paint method:-
private void Diagnostics_Paint(object sender, PaintEventArgs e)
{
Graphics ChartGraphics = e.Graphics;
ChartGraphics.DrawImage(DiagChart.Image, DiagChart.OutLine.Left, DiagChart.OutLine.Top);
ChartGraphics.Dispose();
if(Started)
StaticBtn.Enabled = false;
}
Then it runs:-
Application.Run(new SC226());
which causes an ArgumentException "Parameter is not valid". SC226 is my application, so shouldn't this line only run when the application is launched? If I comment out the first 3 lines of the paint method it doesn't run the "Application.Run" line and I don't get the exception(but my chart doesn't draw). Can anyone help please?
|
|
|
|
|
Do you catch any exceptions somewhere that shut down your application and then restart it? There's no way a class in the System.Drawing namespace would call Application.Run().
|
|
|
|
|
Eduard Keilholz wrote: Do you catch any exceptions somewhere that shut down your application and then restart it?
No there is nothing in my code that restarts the app.
|
|
|
|
|
Richard W Allen wrote: ChartGraphics.Dispose();
You shouldn't be disposing objects you didn't create by calling 'new' on them 
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
