78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
/*
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* udp.c
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*
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* This file is part of Emu48
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*
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* Copyright (C) 2011 Christoph Gießelink
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*
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*/
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#include "pch.h"
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#include "Emu48.h"
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TCHAR szUdpServer[1024] = _T("localhost");
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WORD wUdpPort = 5025; // scpi-raw
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static SOCKADDR_IN sServer = { AF_INET, 0, { 255, 255, 255, 255 } };
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VOID ResetUdp(VOID)
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{
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sServer.sin_addr.s_addr = INADDR_NONE; // invalidate saved UDP address
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return;
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}
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BOOL SendByteUdp(BYTE byData)
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{
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WSADATA wsd;
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SOCKET sClient;
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BOOL bErr = TRUE;
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VERIFY(WSAStartup(MAKEWORD(1,1),&wsd) == 0);
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// IP address not specified
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if (sServer.sin_addr.s_addr == INADDR_NONE)
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{
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LPSTR lpszIpAddr;
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#if defined _UNICODE
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DWORD dwLength = lstrlen(szUdpServer) + 1;
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if ((lpszIpAddr = (LPSTR) _alloca(dwLength)) == NULL)
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return TRUE; // server ip address not found
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WideCharToMultiByte(CP_ACP, WC_COMPOSITECHECK,
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szUdpServer, dwLength,
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lpszIpAddr, dwLength, NULL, NULL);
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#else
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lpszIpAddr = szUdpServer;
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#endif
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// try to interpret string as IPv4 address
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sServer.sin_addr.s_addr = inet_addr(lpszIpAddr);
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// not a valid ip address -> try to get ip address from name server
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if (sServer.sin_addr.s_addr == INADDR_NONE)
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{
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PHOSTENT host = gethostbyname(lpszIpAddr);
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if (host == NULL)
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{
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return TRUE; // server ip address not found
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}
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sServer.sin_addr.s_addr = ((PIN_ADDR) host->h_addr_list[0])->s_addr;
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}
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}
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// create UDP socket
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if ((sClient = socket(AF_INET, SOCK_DGRAM, 0)) != INVALID_SOCKET)
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{
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sServer.sin_port = htons(wUdpPort);
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// transmit data byte
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bErr = sendto(sClient, (LPCCH) &byData, sizeof(byData), 0, (LPSOCKADDR) &sServer, sizeof(sServer)) == SOCKET_ERROR;
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closesocket(sClient);
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}
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WSACleanup(); // cleanup network stack
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return bErr;
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}
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