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Serial ports communication

Posted on 1998-06-15
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Last Modified: 2013-11-15
Hiya,

I'm just getting into c++ and I have a small problem. How do I open, put, and get chars from the com ports?
Some examples would be nice!
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Question by:Severin
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FabMan earned 150 total points
ID: 1165924
If you are talking about the Win32 environment, you should use functions like CreateFile, CloseHanlde, WriteFile, ReadFile, SetupComm, SetCommState and others. If you are programming for Windows for the Windows API (16-bits) you should use functions like OpenComm, CloseComm, SendComm and ReceiveComm. When working with DOS, just use regular file functions, specifying COM1: or COM2: (or whatever the case) as a file name. Here's an example of how to use CreateFile in the Win32 API to open a serial port (there are plenty of other examples in the functions documentation):

  HANDLE hPort = CreateFile("COM1:",
      GENERIC_READ | GENERIC_WRITE,
      0,    /* comm devices must be opened w/exclusive-access */
      NULL, /* no security attrs */
      OPEN_EXISTING, /* comm devices must use OPEN_EXISTING */
      0,    /* not overlapped I/O */
      NULL  /* hTemplate must be NULL for comm devices */
      );

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