85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/****************************************************************************
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*
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* ntcomm.c
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*
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* Copyright (c) 1993 Microsoft Corporation. All Rights Reserved
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*
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* MCI Device Driver for the Pioneer 4200 Videodisc Player
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*
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* Comms compatibility routines for Windows NT
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*
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***************************************************************************/
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#include <windows.h>
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INT OpenComm(LPCTSTR lpstr, UINT wqin, UINT wqout)
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{
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HANDLE hFile;
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COMMTIMEOUTS Timeouts;
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hFile = CreateFile(lpstr,
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GENERIC_READ | GENERIC_WRITE,
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0,
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NULL,
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OPEN_EXISTING,
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FILE_FLAG_WRITE_THROUGH,
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0);
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if (hFile == INVALID_HANDLE_VALUE) {
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return 0;
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}
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/*
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* Set the timeouts to be like win3.1 (as defined in the SDK)
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*/
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Timeouts.ReadIntervalTimeout = INFINITE;
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Timeouts.ReadTotalTimeoutMultiplier = 0;
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Timeouts.ReadTotalTimeoutConstant = 0;
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Timeouts.WriteTotalTimeoutMultiplier = INFINITE;
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Timeouts.WriteTotalTimeoutConstant = INFINITE;
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if (!SetCommTimeouts(hFile, &Timeouts)) {
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CloseHandle(hFile);
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return 0;
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} else {
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return (INT)hFile;
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}
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}
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INT GetCommError(int hDevice, LPCOMSTAT lpComStat)
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{
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DWORD dwErrors;
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if (ClearCommError((HANDLE)hDevice, &dwErrors, lpComStat)) {
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return dwErrors;
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} else {
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/*
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* Concoct something nasty
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*/
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return CE_IOE;
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}
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}
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INT ReadComm(HFILE nCid, LPSTR lpBuf, INT nSize)
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{
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DWORD cbRead;
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if (!ReadFile((HANDLE)nCid, lpBuf, nSize, &cbRead, 0))
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return(-(INT)cbRead);
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return((INT)cbRead);
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}
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INT WriteComm(HFILE nCid, LPSTR lpBuf, INT nSize)
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{
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DWORD cbWritten;
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if (!WriteFile((HANDLE)nCid, lpBuf, nSize, &cbWritten, 0))
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return(-(INT)cbWritten);
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return((INT)cbWritten);
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}
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