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Assuming you are using VC++, you need to add ws2_32.lib to the list of libraries used in the link settings of your program (Project-&gt;Settings, then select the link tab, and then add the library name to the list of libraries.) 
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Assuming you are using VC++, you need to add ws2_32.lib to the list of libraries used in the link settings of your program (Project->Settings, then select the link tab, and then add the library name to the list of libraries.)

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&gt;&gt; Assuming you are using VC++<br />
He is.<br />
<br />
Jason, that seems like an answer...
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>> Assuming you are using VC++
He is.

Jason, that seems like an answer...

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&gt;&gt; But recently some wrong or incomplete <br />
&gt;&gt;&nbsp;answers seem to be being accepted just <br />
&gt;&gt;&nbsp;because they are the answer<br />
<br />
Yeah, that's a new trend. &nbsp;It started about 3 years ago. &nbsp;:-)
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>> But recently some wrong or incomplete
>> answers seem to be being accepted just
>> because they are the answer

Yeah, that's a new trend.  It started about 3 years ago.  :-)

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thank you very much to jasonclarke's for the answer
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thank you very much to jasonclarke's for the answer

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when i compile my program in visual C++ 6.0<br />
the message chatdlg.obj : error LNK2001: unresolved external symbol __imp__gethostbyname@4 occur.<br />
how i solve it
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when i compile my program in visual C++ 6.0
the message chatdlg.obj : error LNK2001: unresolved external symbol __imp__gethostbyname@4 occur.
how i solve it

link error

C++ is an intermediate-level general-purpose programming language, not to be confused with C or C#. It was developed as a set of extensions to the C programming language to improve type-safety and add support for automatic resource management, object-orientation, generic programming, and exception handling, among other features.