Serial port C++ problem

Question

I have a problem connecting to any serial port (want to exchange with an Arduino) using c++ on visual studio.

I'm using the SerialClass given in the Arduino playground, but can't open an handle to my port. It throws ERROR_FILE_NOT_FOUND on every try..

I've been testing many other ways of notating the port:

"COM1"
"COM1:"
"\\.\COM1"

but nothing's working.

The port is availiable on the system, and working fine using Putty or the Arduino IDE. Additionally it isn't blocked by other processes.

I'm using Windows 7 x64, but project is Win32.

The class is constructed with

serialPort = new Serial((char*)port);

and the error string shows the right portname.

What I'm doing wrong?

File opening isn't working, too.

you will probably also want to extend that class to be able to modify the ports settings once you fix your error. It currently doesn't have a way to programmatically configure the port, and all settings are hard coded. The data read/sent will possibly not mesh with w/e you're trying to connect to. Here is also a good example (RIGHT from MS) on how to utilize their .NET framework which has a serial port class directly available. msdn.microsoft.com/en-us/library/… — g19fanatic
If you're looking for an alternative but still using c++, you could try Qt and use the open sourced QextSerialPort library. I've had some VERY good success using it and it has a very small learning curve, considering most of the examples are easily c/p'able to what you're trying to accomplish. — g19fanatic

g19fanatic g19fanatic · Accepted Answer · 2010-11-05T12:53:13

A good example of others manually using the api to open a serial port is here. The relevant part (regarding your question) shows them using the port number as follows:

...
CreateFile("\\\\.\\COM1",GENERIC_WRITE
...

so it could be \\\\.\\COM1 instead of the options you have tried.

Serial port C++ problem

3 Answers