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Using a serial port

Posted on 1998-06-30
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Last Modified: 2010-04-10
I'm using VC++ 5.0 w/ MFC
How do I write to a serial port specifying baud rate and COM port?
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Question by:awong726
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sergem earned 50 total points
ID: 1166939
There are two ways:
 If you want specify baud rate and other parameters use TAPI functions and particualary OpenLine. You have to specify that line you want to open is not a modem. Tor more information and samples see comm sample in Viaul C++

Second way is much simpler. You have to open file (Use CreateFile function) instead of file name use "COM1","COM2" or port name you want to open.

After this you would be able to Read/Write using standart WIN32 API functions ReadFile/WriteFile. To use overlaped i/o use ReadFileEx/WriteFileEx
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