Re: WriteFile(to COM1)

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#12749

From: Remy Lebeau (TeamB)
Date: Thu, 20 Nov 2003 01:59

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"Nicholas Gessler" <gessler@ucla.edu> wrote in message
news:3fbc160d$1@newsgroups.borland.com...

> Could someone please provide me with a few simple sample lines of
> code?  All I want to do is write and read 2-3 ASCII bytes at a time.

(untested)

    HANDLE hComm = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

    if( hComm != INVALID_HANDLE_VALUE )
    {
        // call Get/SetCommState() to set the port settings
        // call Get/SetCommTimeouts() to set the port timeouts

        PurgeComm(hComm, PURGE_RXCLEAR);  // Clear Input Buffer.
        PurgeComm(hComm, PURGE_TXCLEAR);  // Clear Output Buffer.
        EscapeCommFunction(hComm, SETRTS);    // Request to Send

        DWORD dwWritten = 0;
        WriteFile(hComm, "w01", 3, &dwWritten, NULL);

        CloseHandle(hComm);
    }


Gambit

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Subject: Re: WriteFile(to COM1)
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