Mar 15, 2018 - Define to 0 to prevent the use of CaptureStackBackTrace().
The latest release of the free version of my can now be obtained from at. For some time I've been promising to update the to use the latest version of my code. Today I finally updated the code for the first article. I'm going to update the article itself soon, but in the meantime I'm posting the new code here. NOTE: This code leaks when adjusted to build with Visual Studio 2005. This seems to be due to a bug in VS2005's STL. I expect to post a fix for this once I've found time to convert the code to build with the new compiler and then tracked down the leak.
If anyone has already done this then a comment telling me what's wrong would be appreciated. 1) You can now compile the code with VC6 without a Platform SDK installed. To do this, edit NoPlatformSDK.h and uncomment the #define.
2) The sockets now share critical sections. The previous code suggested either allocating a critical section per socket, or sharing one section between all sockets, at the time I mentioned that this was less than ideal and that you'd probably want to do it differently in a production system. Now I'm including a shared critical section system that uses a hash to spread the contention across a pool of critical sections. 3) Servers can now share the IO thread pool.
You can now create multiple servers and have them share a single pool of IO threads. This makes creating servers that listen on multiple ports much less resource intensive.
4) The server can now initiate outgoing connections as well as accept incomming connections. 5) All examples can now build with VS.Net 2003 as well as VS.Net 2002 and VC 6. All examples come with project files for all three build systems. 6) You can now have multiple user data 'slots' per socket. This makes it easier to layer services on top of the server and still allow the client to add their own user data to each socket if they want. 7) Each example ships with a test harness and config file to test the server as part of the build process, if required.
Notice the difference in performance between the debug and release versions. Thanx for your code, very nice work. I have tested it for quite a long time, some problems unsolved that may be a configure inaccuracy or some performance bottleneck somewhere, the issue is: I always confront intensively large ratio of denied connection from client side, say, a test of 500 threads, 40% 90% of connections will be refuesed, although I may trust your architecture as optimized for large-scale network server, but such high ratio of failed connection may suggest its inability to handle high-load connections. I have tried to change socks in pool and way of threadpool, but no noticable improvement. I hope you could possibly reply me on this problem, and if convinient, give suggestions on high-load server. Have you tried running the test from more than one client machine?
It may be a problem with your client side code, or it may be a problem with the client side using up all available ports if it's opening and closing connections quickly (leaving ports in TIMEWAIT state, etc). What does netstat show on the client and/or server? Are you running the release version of the code? The debug version is considerably slower due to the locking done around the debug output (this makes a huge difference to the performance of the app).
Thanks for reply, yes I have a carefully arranged test so all possible situations, include local test and between workstations, and the client tools are vary also. The result is similar, though we might go around with less chan se of error by turning down the numbers in: 3 but anyway the disability to connect to remote socket did happen in most tests, combined by an other error that indicate a failure to transport any message. I havent found a solution to it yet.
An other problem is the memory issue, it seems quite interesting, the echo server and packet server are using extremly little memory that is comparable to virus, among 200k-400k, when under large connection pressure, and it decrease memory usage as time goes by, very strange. On the other hand, the large packet server with thread pool eats more than 300M memory when it starts to take incoming connections, abnormal, might be leaks somewhere. What does your client machine's netstat command say at the point where you fail to connect? I expect you're running out of ports and ending up with lots of old connections in timewait.
This is normal - you dont expect to run 10000s of short lived connections on the client side. As I suggested, run with multiple clients using fewer connections per client and see if you can go above the limit for a single client. If so then I'd suggest the problem is on the client end and not the server end. The memory issue is as expected.
Take a look at the code. The echo server uses 1024 byte buffers and writes the response back to the client using the same buffer that it uses to do the read (as far as I can remember). Memory will decrease as we only pool a certain number of buffers, so when the connections die the buffers are released. So it will only use 1024 x number of active connections for buffers. The large packet echo server uses 1024 byte read buffers and 65536 byte message buffers (between socket server and business logic thread pool), it also echoes the messages back in small chunks (666 bytes) so will naturally create many more buffers than the other servers. This is by design, read the associated articles for the reasoning. If you need masses of incomming client connections then it's probably worth specifying the 'use zero byte reads' option as this will reduce the amount of 'non paged pool' that is used by the server.
Again, read the articles and comments for details. Thanx for your greate code, it was very useful to me about basic of IOCP architecture. But, i have some request.if you will. I wondering belongs -the Test.dsw code include whole project.SocketServerTest.exe -SimpleProtocolServerTest.dll -SocketServerTestInterfaces.dll because, As i made custom server use your library,I don't have especially testing Tool. So, Could you show me some test library code or let me know how do you made the TestingApp. For example, Testapp's architecutre? The sequence?
My english is very poor. Sorry.:) thankx. Thanx for your greate code, it was very useful to me about basic of IOCP architecture. But, i have some request.if you will. I wondering belongs -the Test.dsw code include whole project.SocketServerTest.exe -SimpleProtocolServerTest.dll -SocketServerTestInterfaces.dll because, As i made custom server use your library,I don't have especially testing Tool. So, Could you show me some test library code or let me know how do you made the TestingApp.
For example, Testapp's architecutre? The sequence?
My english is very poor. Sorry.:) thanx. I have question one more time. In XML i can't type ^,^ so, replaced ',' ok? The number of conversations is the number of times the entire test is run on the connection.
So the test harness will connect to the server, it will then loop for the number of conversations and each time through the loop it will send all the messages that the MessageExchange object contains. The multiple message flag is used to decide if the server will send multiple messages in one send. This forces your server to deal correctly with multiple messages arriving in a single read call. The fragments flag determines if the test will send bits of messages and force your server to deal with a single read not returning a whole message.
The server may or may not realise that the connection to the client has been terminated; read up on how TCP/IP works. If the client or server closes the connection cleanly then the server will know straight away. If there's some sort of problem (network cable pulled out, router failure, client pc crashes) then the server will only discover it when it next tries to send a packet to the client. If you want to know as soon as possible then you need to either use the TCP/IP keep alive stuff or implement your own application level keep alive protocol. I wanna ask question related to following constructor function.
CSocketServer server( lockFactory, pool, '+OK POP3 server ready r n', INADDRANY, // address to listen on 5001, // port to listen on 10, // max number of sockets to keep in the pool 10, // max number of buffers to keep in the pool MAXRECVBUFF); // buffer size what's the limit? Socket number, buffers, buffer size? I knew, it's depend on myServer resource. But, i wanna know what things have something do to with the parameters. Could you explain. Concern with client(user), for example, i waana service for 1000 user max packet size is 1024.10 byte = 10Kbyte then how many buffers i need?
Set the case, hardward(server) resource support enough. Sorry to disturb you again but i like to clear one problem in my try. I found your document in codeproject.com there are some hint about hadling connections. ////////////////////////////////////////////// Maintaining per-connection state The final thing that our server may need to do is associate some internal server state with a particular socket connection, the Socket class makes this particularly easy as it provides the following member functions: void.GetUserPtr const; void SetUserPtr(void.pData); unsigned long GetUserData const; void SetUserData(unsigned long data); ///////////////////////////////////////////// so, to make chatserver-broadcast function- should i use above function? If so, Do i need other criticalsection for connection manage? Plz give me some advise.
The lint options file and lint comments are because I use Gimple Lint (which is like running your compiler with the warning level set to 11. I don't know if I like the fact that I contaminate the source with warts that suppress warning messages for things that I want to be warned about but sometimes like to turn off because I know that the warning is being too cautious. It works, but I think I'll end up moving away from the //lint comments etc and use external suppression files. Hi Len, Thanks so much for sharing your code. Out of all the free packages I have seen, yours is by far the most well designed. Unfortunately, when just testing the code on my laptop I can not ge the echo server to respond reliably.
I am assuming that this is something about my particular setup, but I just wanted to let you know. I am running an IBM Thinkpad P3 500 with Win2k Pro, MSVC.NET (2000) and the loopback adapter. I was just running the compiled version and connecting with telnet. Thanks again for sharing your hard work with all of us. Cheers, Adeh. I setup a project use MFC APPWizard. Than add your Win32Tools to the project, but report errors Linking.
![Socket Socket](/uploads/1/2/5/5/125576766/470650049.jpg)
Nafxcw.lib(afxmem.obj): error LNK2005: 'void. cdecl operator new(unsigned int)' (??2@YAPAXI@Z) already defined in LIBCMT.lib(new.obj) nafxcw.lib(afxmem.obj): error LNK2005: 'void cdecl operator delete(void.)' (??3@YAXPAX@Z) already defined in libcpmt.lib(delop.obj)././Bin/OutlookBar.exe: fatal error LNK1169: one or more multiply defined symbols found Error executing link.exe. How to resolve the problem? I'm sorry for this real quick q. I already sent you an E-Mail about it. I based my project on the article 'Handling multiple pending socket read and write operations' and the code there '.server6'.
Now I see you have an update. But all the projects in SocketsServer.zip look a lot different from what is in the article. For example the thread pool instead of like 10 params has just one:D. On the other hand I see bits of the code in socketserver.cpp that handle the sequence.
So the question is which project in the socketservers.zip is the one that takes care of the 'Handling multiple pending socket read and write operations'? Can you just quickly give me an idea where at least to read about this package?
The Windows Control Panel is the ideal way to allow a user to alter settings for an application that runs in the background, or automatically. But what are control panel applets and how do you write one? Well, after some exploring in the MSDN I discovered that control panel applets are just standard DLLs with a particular set of entry points and a.cpl extension. Place such a file in the Windows System directory and the next time you start up control panel your applet will be there.
Having discovered what I needed to know I set about writing a control panel applet and once I'd done that, I turned the bulk of the code into a mini applet framework so I wouldn't have to write it ever again! To implement your control panel applet all you need to do is the following:. include 'ControlApplet.hpp' and publicly derive a class from CJBControlPanelApplet.
call the CJBControlPanelApplet constructor and pass resource IDs for the applet's icon, name and description. implement the pure virtual function OnDoubleClick - this is where your applet becomes live and can display a dialog or whatever. create an instance of your applet class at global scope. link with ControlApplet.cpp and include ControlApplet.def in your project. ControlApplet.cpp gives you the implementation of CJBControlPanelApplet and suitable DllMain and CPlApplet DLL entry point functions.
So that this article and code can be kept up to date more easily I've provided a link to where the article is located on my own web pages. Last updated: 27 June 1998. Comments. Win 2000 and XP Posted by Legacy on 07:00am Originally posted by: Do any of you guys know how to get a control panel applcaition working in win2000 and XP? I'm having trouble with mine.
Is this project working for you? V-man.
links is not dead Posted by Legacy on 08:00am Originally posted by: Bob Thiry. The download link is dead!
Posted by Legacy on 08:00am Originally posted by: Bug Alert Damn it. ControlPanel and MFC Posted by Legacy on 07:00am Originally posted by: The Framework for ControlPanel Applets works great, but I'm not able to make a ControlPanel DLL which uses MFC CPropertySheet. Each time I'm executing the ControlPanel it opens and shows the PropertySheet, but I get immediately a dialog window 'Control Panel failure.' And a OK button to quit. The modal loop from CPropertySheet gets a wrong message (message pointer 0x00000038).
What's wrong. Has somebody an example? Michael. add app into 'keyboard' of control panel Posted by Legacy on 08:00am Originally posted by: Hi, i am leaval wang. I am in China.
I met a question about control panel applet. I have written a program whose function is definition of hotkey, and i want to put it into 'keyboard' of control panel, likely server it as a property page of 'keyboard'. Would you give me some advice. You must have javascript enabled in order to post comments.
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