About listening an active port event

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How to listen port event..?
In which language it is feasible..?(c/c++/java)

OP Update to Ques:
How to generate list of current active ports on the system..?
In which programming language it is feasible..? (c/c++/java).

Posted 23-Dec-10 17:39pm

Sagarkadam

Updated 24-Dec-10 19:25pm

Sandeep Mewara

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Dave Kreskowiak 24-Dec-10 1:18am

What are you talking about? "Port event"?? Are you talking about how you listen on a TCP/IP port and communicate with it?

fjdiewornncalwe 24-Dec-10 12:19pm

The answer to your question as it is written would be : "Yes"... But that isn't very helpful to you because it isn't complete, which is also the state of your question. Please expand your question with more information as to what you are trying to do so that we can help you along your way. Cheers.

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maq_rohit · Answer 1 · 2010-12-31T23:59:00

Best approach to get active ports from hardware oriented language like c, c++. in c we can make code snippet like

Try QueryDosDevice, e.g.

TCHAR szDevices[65535];
unsigned long dwChars = QueryDosDevice(NULL, szDevices, 65535);
TCHAR *ptr = szDevices;

while (dwChars)
{
int port;
if (sscanf(ptr, "COM%d", &port) == 1)
{
// Add to list of com ports
}
TCHAR *temp_ptr = strchr(ptr, 0);
dwChars -= (DWORD)((temp_ptr - ptr) / sizeof(TCHAR) + 1);
ptr = temp_ptr + 1;
}