How do I set the value of DCB?

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In my VC++ code of serial communications,

I want to know how to set the values of DCB of configuration of serial ports.:

If I select a flow control value of 3 types :

1. Xon/Xoff
2. None
3. RTS/CTS

and then,

DCB.f.... = false or true...

Could you understand what I mean?

Thank you in advance.

What I have tried:

More 1 days wasted for this problem.

Posted 8-Jun-17 22:03pm

Member 12330615

Updated 9-Jun-17 0:20am

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2 solutions

Solution 1

See DCB structure (Windows)[^].

Posted 8-Jun-17 22:35pm

Richard MacCutchan

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Jochen Arndt · Accepted Answer · 2017-06-09T00:20:00

Clear the DCB first and then set the required fields:

DCB dcb;
::ZeroMemory(&dcb, sizeof(dcb));
dcb.DCBlength = sizeof(dcb);
dcb.fBinary = TRUE; // must be always true

// Use your settings here (this is 9600 baud 8N1)
dcb.BaudRate = CBR_9600;
dcb.ByteSize = 8;
//dcb.Parity = NOPARITY; // (NOPARITY == 0)
dcb.StopBits = ONESTOPBIT;

// No flow control: Nothing to do

// RTS/CTS
dcb.fOutxCtsFlow = TRUE;
// EDIT: Must be off course RTS
//dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;

// XON/XOFF
dcb.fOutX = dcb.fInX = TRUE;
dcb.XonChar = '\x11';
dcb.XoffChar = '\x13';
dcb.fTXContinueOnXoff = TRUE; // optional / depends

// These depend on the input buffer size (passed to SetupComm()). 
// Below are commonly used values (50 / 75 %).
dcb.XonLim = RxBufSize - (RxBufSize / 2);
dcb.XoffLim = RxBufSize - (RxBufSize / 4);