komeisa
asked on
Trouble opening connection to serial port through "CreateFile"
Hey Everybody,
I am trying to get access to my serial port through the CreateFile Method like this
HANDLE portHandle = CreateFile( "COM2", GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING,FILE_FLAG_OV
but it keeps giving me an invalid handle. I suspect it is the name of the port. I want to access comm port 2 (like if I were in hyperterminal it would be com2) but have no clue if I am using the right name here. Any help would be greatly appreciated.
I am trying to get access to my serial port through the CreateFile Method like this
HANDLE portHandle = CreateFile( "COM2", GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING,FILE_FLAG_OV
but it keeps giving me an invalid handle. I suspect it is the name of the port. I want to access comm port 2 (like if I were in hyperterminal it would be com2) but have no clue if I am using the right name here. Any help would be greatly appreciated.
This looks correct. If your result is portHandle == INVALID_HANDLE_VALUE, what error is reported by GetLastError()? Are you sure COM2 is configured on your machine?
ASKER
I figured out the problem. My application is in managed C++. And I guess it doesn't like the CreateFile Routine. Any clue on how I might get this to work in a managed C++ environment
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ASKER
Yeah,
I finally got it to work, it wasn't because of the managed c++. I think it was an error in my code. I reailized that I was connecting okay to the port but when I would try to write something out onto the port it would come back with an error. It turns out I wasn't passing the buffer with the data to transmit correctly. Thanks for you help, I really appreciate it.
I finally got it to work, it wasn't because of the managed c++. I think it was an error in my code. I reailized that I was connecting okay to the port but when I would try to write something out onto the port it would come back with an error. It turns out I wasn't passing the buffer with the data to transmit correctly. Thanks for you help, I really appreciate it.