Ping to a specific host
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Hi and welcome to devnet,
If you are asking for a Qt solution, have a look at QNetworkManager and friends. Otherwise, just download and have a look at the ping source code
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Qt has no support for ICMP so cannot help you with a ping request.
Various operating systems provide support for doing this, e.g.
http://msdn.microsoft.com/en-us/library/aa366050(VS.85).aspx
Raw sockets on Linux