Basic Graphics Question - C / C++ / MFC Discussion Boards

s7roz17-Jun-04 8:56

17-Jun-04 8:56

I have problems with a 32-bit client, a 64-bit server and a 32-bit server. These applications use sockets.

The applications were written in Visual C++ 6.0 and I use the Microsoft Platform SDK SP1 to compile the server code for the Itanium 64-bit platform.

It seems that sockets in 64-bit behave quite different than sockets in 32-bit. For example when I execute 20 clients trying to connect 100 times to a server this is what happens:

30% of the connections from the 32-bit clients to a 64-bit server fail, whereas on 32-bit it is less than 5%.

The server code is 32-bit and 64-bit compliant. So when i need the server in 32-bit i just compile it for 32-bit and the same with 64-bit.

Another problem that i'm having in 64-bit is that sometimes clients say they were connected but the 64-bit server does not accept their connection.

Any one with ideas?

Thank you very much.

Re: Sockets in 64-bit

valikac17-Jun-04 12:57

valikac

17-Jun-04 12:57

First off, what I/O model? Secondly, describe more about what you mean by server not accepting connections.

Kuphryn

CString vs. std::string performance for large buffers

Maximilien17-Jun-04 7:45

Maximilien

17-Jun-04 7:45

I'm creating a large string with CStringto be inserted in an web browser.

I'm mostly concatenating tags and text in the string, eventually, the string will become quite large, and performance will suffer a bit.

is using std::string faster ? if I use std::string::reserve to reserve some memory, even if it's really too much for small buffers, will that make operations faster ?

Also, I'd prefer not having to go back to C strings.

my "builder" class is something like

class Builder
{
  CString sBuffer;
  //...
  void beginRow() { sBuffer += "<tr>";} ;
  void endRow() { sBuffer += "</tr>"; };
  //...
}

with some other basic html tags methods ...

Thanks.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: CString vs. std::string performance for large buffers

palbano17-Jun-04 8:22

palbano

17-Jun-04 8:22

certainly pre allocating buffer will increase performance regardless of which class you use.

"No matter where you go, there your are." - Buckaroo Banzai

-pete

followup and another question.

Maximilien17-Jun-04 10:34

Maximilien

17-Jun-04 10:34

well, after some experimenting, seems that the problem is calling my Builder class.

If I create the string locally and send the whole shebang to the Builder class instead of using the Builder class to ease the work of me and other programmers, it goes way, way faster.

Is there a way to reduce the overhead of function calling, inlining the methods does not seems to do much, and I would like not to be forces to use MACRO.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: followup and another question.

vladfein17-Jun-04 11:32

vladfein

17-Jun-04 11:32

I do not think that the function calling is your problem.
Do you by chance pass strings around by value? That would cause frequent allocation / copying of the strings' content, an THAT will hurt you.
Do you use a profiler to find where the time is spent?

-----------------------------
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DDEML - DdePostAdvise

swerajan17-Jun-04 7:20

swerajan

17-Jun-04 7:20

I am writing a DDEML program that also runs a MQ client program within it. The MQClient reads from a remote queue and i am trying to write the data read to an excel file using DDEML. I am using DdePostAdvise to call DdeCallBack Function that writes to the Excel file. But the DdePostAdvise is not working properly. Does anyone have a clue on how to do this?????? Please let me know

Basic Graphics Question

Piccaso17-Jun-04 6:30

Piccaso

17-Jun-04 6:30

Dear All,
I am a novice in C++ programming (or any kind of programming). I am
teaching myself C++ these days mainly to run some mathematical models.
I am using a PC at home (windows millenium).
In order to simulate the models, I need to draw graphs, mainly a set
of numerous connected line segments, also I need to be able to plot
points. I am using Microsoft Visual C++ 6.0. Actually I don't even know
how to create a new window where I can do all these graphings and
don't know which commands to use.
Could someone kindly email me a complete code in visual C++ which
opens a window, draws a set of say 10 connected line segment (if in color, it would be great) and plot a point. I am sure that this is a fairly easy matter. I will very greatly appreciate any help. You will save m A LOT of time. And I will be greatful if you email me at ali_nabavi2000@yahoo.com
Kind Regards,

Re: Basic Graphics Question

Roger Wright17-Jun-04 6:52

Roger Wright

17-Jun-04 6:52

Check out the articles collection here. There are a number of graphing apps available. You may find one that works for you, or that can be easily adapted to your use. It's very unlikely that anyone will write one for you, though.

Some people think of it as a six-pack; I consider it more of a support group.

Re: Basic Graphics Question

palbano17-Jun-04 6:52

palbano

17-Jun-04 6:52

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vctutor98/HTML/_gs_scribble_tutorial.asp[^]

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Re: Basic Graphics Question

pavanbabut20-Jun-04 8:18

pavanbabut

20-Jun-04 8:18

i think its better if u can go through the tutorials of NeHe site for graphics.
http://nehe.gamedev.net

Pavan Kumar N Tiruveedhula
2382 Duncan Dr #4
Fairborn, Ohio-45324

1 (978) 473-1244

Thread has exited with code 3

Maarten Kools17-Jun-04 5:48

Maarten Kools

17-Jun-04 5:48

I keep getting that message when closing my application (haven't tested in release version yet though).

Is there a way to figure out which thread that exactly is, and why it exists with code 3?

Re: Thread has exited with code 3

palbano17-Jun-04 5:57

palbano

17-Jun-04 5:57

Try using Debug/Threads on the IDE Menu when debugging your process.

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Re: Thread has exited with code 3

toxcct17-Jun-04 7:47

toxcct

17-Jun-04 7:47

GetLastError()

TOXCCT >>> GEII power

Re: Thread has exited with code 3

Maarten Kools17-Jun-04 7:55

Maarten Kools

17-Jun-04 7:55

I get the error on exiting my application:

The thread 'Win32 Thread' (0x3e0) has exited with code 3 (0x3)

I don't know if it's a really big issue, I guess not, but still I'd like to know what's up with that every time

Re: Thread has exited with code 3

toxcct17-Jun-04 8:40

toxcct

17-Jun-04 8:40

exit codes != to 0 dont mean that there has been an error.
you must find out what this code represent, but for that, get (and give us if you want) more infos on that thread...

TOXCCT >>> GEII power

Re: Thread has exited with code 3

Maarten Kools17-Jun-04 12:19

Maarten Kools

17-Jun-04 12:19

I'd really like to give you that info, but unfortunately, I have no idea which threads return that code. I guess it's some internal MFC thread or something.

char -> string.append problem

Scozturk17-Jun-04 5:11

Scozturk

17-Jun-04 5:11

Hi!
I am using the win32 api c++.
I have a problem when I try to get some variables from textboxes and comboboxes.

<br />
string code;<br />
char getvalues;<br />
<br />
code.append("your values are: ");				<br />
GetDlgItemText(hwnd, IDC_E1, &getvalues,20);<br />
code.append(&getvalues);<br />
code.append(" from e1- ");<br />
GetDlgItemText(hwnd, IDC_E2, &getvalues,20);<br />
code.append(&getvalues);<br />
code.append(" from e2- ");<br />
.....<br />

Well this code works fine if there are no spaces or special characters between the values in the boxes
but when there is a value like "text-decoration" or "text decoration" it gives an error. The error comes when the code.append(&getvalue) is processed.
I want to use the code in a javascript generation application.
Thank you very much for your answers in advance!

Well... I am a beginner ...

Re: char -> string.append problem

palbano17-Jun-04 5:17

palbano

17-Jun-04 5:17

getvalues is a type char and you are telling GetDlgItemText that it is 20 bytes long. It's not so you will get undesirable behavior.

"No matter where you go, there your are." - Buckaroo Banzai

-pete

Re: char -> string.append problem

V.17-Jun-04 5:20

17-Jun-04 5:20

get CWnd object of your control
GetWindowText(ACString);
that's easier.

I'm not sure but can you add more then 1 char to something defined as char somename? (better char* somename) maybe thats your mistake?

I would go for the first try. CStrings are for once really managable.

Good luck.

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

Re: char -> string.append problem

RChin17-Jun-04 5:22

RChin

17-Jun-04 5:22

Scolinks wrote:
string code;
char getvalues;

shouldn't this be :

<br />
string code;<br />
char getvalues[20+1]<br />

I Dream of Absolute Zero

DLL help

Member 62736417-Jun-04 5:11

Member 627364

17-Jun-04 5:11

hi all ,
sorry for my english , french.
try to explain :
i have build à dll in vc++.
this dll need microsoft dll and is called by few exe.
My boss don't want install ms dll on a system path or in path of each exe
Any idea ?
Please helpppppp.......... Smile | :)

thx

Re: DLL help

RChin17-Jun-04 5:24

RChin

17-Jun-04 5:24

You could staticly link the MS dll's to yours. This will make your dll larger, but it will mean that you do not have to re-distribute distribute the dependent dlls.

I Dream of Absolute Zero

Re: DLL help

Blake Miller17-Jun-04 5:27

Blake Miller

17-Jun-04 5:27

There is a registry key called 'App Paths' in the registry.
HKEY_LOCAL_MACHINE\Software\Microsoft\Widnows\CurrentVersion\App Paths

For each EXE you specify, you can also specify additional folders' that the application will use to search for a DLL.

So, put all your DLL into one folder, and create an app paths entry for each of your special EXE files.

Good luck!

Re: DLL help

Member 62736417-Jun-04 22:54

Member 627364

17-Jun-04 22:54

thx for this trip
works fine for simple exe but
infortunatly , i have services NT too who try acces this dll.
not work for services , any idea?
thx

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