RS232 connect

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I'm sorry that spend your time solving my question. When I communication through RS232 with API. When I pull out the line of RS232 and I do CloseHandle()in my porgram. When I insert it again and can't receivec data anymore. What happen to my program. Something will i lose? Could you halp me, please! Thanks.

Posted 21-Jun-10 22:26pm

smallgreen29

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OriginalGriff 22-Jun-10 5:06am

Try posting a small relevant code fragment - enclosed with the code block widget to preserve the formatting.
Edit you existing post, and try again.

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LittleYellowBird · Answer 1 · 2010-06-22T00:24:00

Solution 1

Check that CloseHandle() returns 'non-zero'. If it returns zero it has failed and you can use GetLastError() to find out what that error was.

Posted 22-Jun-10 0:24am

LittleYellowBird

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smallgreen29 22-Jun-10 6:44am

hello! returns is true. what else i can try? Please tell me. Thanks.

LittleYellowBird · Answer 2 · 2010-06-22T00:57:00

If CloseHandle returns TRUE then I suggest you look at how you open the port. Do you use CreateFile? What does that function return? Does it return INVALID_HANDLE_VALUE?

Perhaps you could post the code that opens the port (add it to your original question or start a new one because if you put it in the comment it is really tough to read and no-one else will notice it). :)