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You might have solved your problem by now, but one other reason that CSocket sometimes appears to "freeze" is that another one of the "golden rules" of sockets is broken: Don't call Receive() multiple times inside of OnReceive(). The correct code will make exactly one single call to Receive() inside OnReceive().
MSDN advises that multiple calls to Receive() can cause the application to freeze.
The same rule applies to CAsyncSocket() too.
See "Mfcsocs.exe sample demonstrates how to communicate in a TCP connection in Visual C++" at http://support.microsoft.com/kb/185728[^], which talks about a situation in which there are no more FD_READs. The simple little word about the application "hanging" is so important that it should be in large red bold letters, but it's not.
Mike
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Thanks mate. I have solved it but it is true that microsoft sould be abit more open about what can go wrong with csocket. Especially since it is the default class when using wizards
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I added Xp style to my application.According to the instruction of the following article(From www.CodeProject.com).
http://www.codeproject.com/w2k/xptheme.asp?df=100&forumid=2590&exp=0&select=1186683&mpp=50#xx1186683xx
But the problem was there was a border around the button i created using
CButton::Create().
So i need to get rid of that problem.pls reply me
bhw
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please ask this on the dedicated forum at the bottom of the article... the author will certainly reply to you faster there.
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Still Author did not reply my Question
bhw
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You must wait he/she needs to read your question.;)
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1>Linking...
1> Creating library Debug\Polygon.lib and object Debug\Polygon.exp
1>Embedding manifest...
1>Registering output...
1>Build Time 0:13
1>Build log was saved at "file://c:\CodeStation\Polygon\Debug\BuildLog.htm"
1>Polygon - 0 error(s), 0 warning(s)
2>------ Skipped Build: Project: PolygonPS, Configuration: Debug Win32 ------
2>Project not selected to build for this solution configuration
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 1 skipped ==========
In above ATL object compilation the output is a dll. What is the significance of a lib and an exp at the same time.
Secondly what is the intend of a manifest and why is it embedded?
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Mr Groezer,
You seem to me to be a beginner. I have nothing against that, because I know some things are difficult to assimilate when we don't know them at first.
BUT
you also seem to me to be a bit too lazy, because your questions sound like interviews.
I now don't think anymore you are passing any interview, because it's been too long now since you first asked a question of that style. but sincerely, Google AND MSDN are your friends, especially in those matters, and you should not intend a programming forum to answer every of your question, even if everyone can answer them.
The forum is a place where you have to show a professional behavior. that means when you have a basic point to figure out, first search the web for it yourself, try to keep it fixed yourself, see the web if anyone already encountered that issue before you, and only then, you ask, providing all the infos that will permit us to help you (that is, all the steps you've done before asking the forum).
thanks for understanding that i am being indulgent by not blaming you much
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Thanks Mr Toxcct. I was expecting some practical answer not bookish knowledge from google  
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then, practically, a .lib file is used when linking a dll statically in your project. it is not needed if you link dynamically, but you'll have to know the dll exported symbols to use them.
about the .exp files, I don't know much, but i never used them, and it seems that they are only generated in debug mode, so they are certainly not worth it to think to much on them
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Hi Tom,
I have read several of your questions now, and like toxcct says, you do not seem to be willing to take the first step yourself. When you get into more advanced programming, you will learn that the first step is always the internet. Whether you choose google or MSDN or the usenet news groups is up to you, but I think you will find that to get respect from people at CP, you must show some willingness to to do some work yourself. Try google or MSDN, and come back when you have informed questions.
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I dont know when I use of google for search about my questions finaly I arrive to Codeproject.
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Well guys , i am transferring live video image coming from a webcam(by a server application having Media Player Encoder(9 series) to a client(application containing Media player4(active x control), but i m getting a delay aroud 5 to 7 seconds.Infact as per my requirement 1 to 2 secs delay can be dangerous. As per the configuration ,i m working with 100 Mbps LAN network.
Plz help me to reduce the dealy, if any one have some way?
if u have information regarding other way of real image transfer. plz ur views are welcome
I shall be thankful to u.
Naveen Khanna
Software Engg.
Gurgaon
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you can not reduce delay . in windows media encoder there is always
a delay of about 5 - 15 seconds . if you are working on the
100 Mbps LAN then you can use the other third party streaming software.
I know in main concept it is 1-2 second delay
RajeshGupta
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Thanks Mr. Gupta for your kind suggestion.
can u tell me about these third party tools(if u have info regarding any one). from where i can get it(free or paid)?
Thanks
Naveen Khanna
Software Engg.
Gurgaon
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Media player defaults to 5000ms of preroll buffering if I remember right. In the "retail"
version of the player you can set this down to 1000ms so maybe there's an equivalent property
in the activeX control - check the Media Player SDK.
You should also set a low buffer size in the encoder profile as well - 500ms maybe?
For less than about 2 seconds overall latency, you'll need to go to lower level APIs/SDKs or use
3rd party software, as mentioned by others.
Mark
"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder
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Well Mr. Mark,yes it's right that media player have 3 sec default buffering time and u can set it min 1 sec which i had set in profile settings already still latency is more than 5 to 7 secs.
can u tell me about these lower lever API's to use or any 3rd party software?
Thanks
Naveen Khanna
Software Engg.
Gurgaon
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Naveen Khanna wrote: can u tell me about these lower lever API's
Check out the Windows Media Format SDK[^].
Combined with DirctShow, you can get pretty low latency if you dig into the settings 
Mark
"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder
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Yes - link your app statically to MFC and CRT.
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Thanks for replying Hans, are you referring to the following:
C Run-time and Standard C++ Libraries
msvcm80.dll
msvcp80.dll
msvcr80.dll
Microsoft Foundation Classes
mfc80.dll
mfc80u.dll
mfcm80.dll
mfcm80u.dll
Many Thanks
Regards,
The only programmers that are better than C programmers are those who code in 1's and 0's.....
Programm3r
My Blog: ^_^
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In Visual Studio 2005, the options to statically link to MFC is under General - under Use Of MFC, select Use MFC In A Static Library. To statically link the C runtime, under C/C++, set Runtime Library to Multi-Threaded (/MT) for the release build and Multi-Threaded Debug (/MTd) for the debug build.
Statically linking increases the size of your binary and means that if Microsoft release any security fixes, your application will have to recompiled to include the fixes, rather than picking them up directly from the updated DLL. The Visual C++ runtime updates for Visual Studio 2002 and later are distributed as side-by-side assemblies for Windows XP and later, but include publisher policy files to force applications to run on the latest installed version, unless the application opts out by specifying a specific version in its configuration file.
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A very newbie question:
I have two classes for drawing images in windows:
<br />
<br />
class Win<br />
{<br />
public:<br />
void DrawImage(Image *img, int x, int y);<br />
void DrawPixel(int x, int y);<br />
}; <br />
<br />
class Image<br />
{<br />
private:<br />
<br />
XImage *ximage;<br />
Win *win;<br />
<br />
public:<br />
Image(Win *window, int w, int h);<br />
<br />
};<br />
The internals of the Image class depend on the properties of the window on which it is to be drawn, so the Image constructor needs to be passed a Window pointer. The code to draw an image, in the Window class, needs to be passed an Image pointer. A the moment, this doesn't compile (with G++), since the compiler doesn't know about the Image class when it reaches the prototype of the Win::DrawImage method. Swapping around the class definitions obviously doesn't help since it then doesn't know about the Win class when it reaches the constructor of Image.
One solution is to make the image drawing a method of the Image class, but since drawing requires the use of a lot of private data in the Win class, I'd rather keep drawing as part of the Win class.
What is the best way of resolving this problem? I get the feeling that there is some feature of C++ that I don't know about which will tell the compiler about the Image class, and get it to accept an Image *, before it reaches the class definition.
Cheers
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Pur those classes in separate files. Each class with one header file and one cpp file. In the header files, you can use forward declaration:
class Image;<br />
<br />
class Win<br />
{<br />
.....<br />
};
This will tell the compiler that the class Image exists and will be defined elsewhere. This works only because you are working with pointers and you don't use anything specific from the class (you just declare a pointer). This won't work if you use a class instance instead of a pointer.
Then in the cpp file of the Win class, you will need to include the header file of the Image class.
You'll need to do that for both classes.
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Why does it work only when u use pointers?
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