windows串口编程
#include<stdio.h>
#include <stdarg.h>
#include <windows.h>
#include<winsock.h>
#pragma comment(lib,"ws2_32.lib")
HANDLE hCom=0; //全局变量，串口句柄
char recv_ch[2]={0};
#define MAX_MESSAGE_LEN 100
char recv_str[MAX_MESSAGE_LEN];
char recv_cmd[10]={0};
char local_ip[20]={0};
char send_str[MAX_MESSAGE_LEN];
int debug_flag=0;
int myprintf(const char *format, ... )
{
if(debug_flag)
{
va_list args;
va_start(args, format);
vprintf(format, args);
va_end(args);
}
return 0;
}
int getlocaladdress()
{
WSADATA wsaData;
char name[155];
char *ip;
PHOSTENT hostinfo;
if ( WSAStartup(MAKEWORD(2,0), &wsaData ) == 0 )
{
if( gethostname(name, sizeof(name)) == 0)
{
if((hostinfo = gethostbyname(name)) != NULL)
{
ip = inet_ntoa(*(struct in_addr *)*hostinfo->h_addr_list);
memcpy(local_ip,ip,sizeof(ip)*8);
myprintf("local ip address:%s\n",local_ip);
}
}
else
{
return -1;
}
WSACleanup( );
}
else
{
return -1;
}
return 0;
}
int getmessage()
{
int i;
BOOL bReadStat;
DWORD wCount;//读取的字节数
if(!hCom)
{
myprintf("the com2 fd is 0\n");
}
myprintf("geting the command from com2...\n");
PurgeComm(hCom,PURGE_TXABORT|PURGE_RXABORT|PURGE_TXCLEAR|PURGE_RXCLEAR);
for(i=0;i<MAX_MESSAGE_LEN;i++)
{
bReadStat=ReadFile(hCom,recv_ch,1,&wCount,NULL);
recv_ch[1]='\0';
if(!bReadStat)
{
myprintf("read the com2 error\n");
continue;
}
if(recv_ch[0] == '\n' || recv_ch[0] == ' ' || recv_ch[0] == '\0' || recv_ch[0] == '\t')
{
myprintf("nothing to get yet\n");
break;
}
myprintf("%c\n",recv_ch[0]);
recv_str[i] = recv_ch[0];
memset(recv_ch,0,sizeof(recv_ch));
}
myprintf("the command from com2 is: %s\n",recv_str);
return 0;
}
int parsemessage()
{
int i;
int j=0;
int flag = 0;
for(i=0;i<MAX_MESSAGE_LEN;i++)
{
if(recv_str[i] == ':')
{
flag = 1;
continue;
}
if(recv_str[i] == '\n')
{
break;
}
if(flag)
{
recv_cmd[j++] = recv_str[i];
}
}
myprintf("parse the command: %s\n",recv_cmd);
return 0;
}
int responsemessag()
{
DWORD dwBytesWrite;
BOOL bWriteStat;
int len;
if(!hCom)
{
myprintf("the com2 fd is 0\n");
}
if(memcmp("ip",recv_cmd,2) == 0)
{
memcpy(send_str,"put:",4);
strcat(send_str,recv_cmd);
strcat(send_str, ":");
if(getlocaladdress() == 0)
{
strcat(send_str,local_ip);
}
else
{
myprintf("get local ip addr error\n");
return -1;
}
len = strlen(send_str);
send_str[len]= '\0';
myprintf("sending the data(%s) to com2\n",send_str);
PurgeComm(hCom,PURGE_TXABORT|PURGE_RXABORT|PURGE_TXCLEAR|PURGE_RXCLEAR);
bWriteStat=WriteFile(hCom,send_str,len+1,&dwBytesWrite,NULL);
if(!bWriteStat)
{
myprintf("send message to com2 error\n");
}
else
{
myprintf("send message to com2 success,total send len: %d(byte)\n",dwBytesWrite);
}
}
else
{
myprintf("the command is not ip \n");
}
memset(recv_str,0,sizeof(recv_str));
memset(recv_cmd,0,sizeof(recv_cmd));
memset(send_str,0,sizeof(send_str));
return 0;
}
int main(int argc, char **argv)
{
if( argc == 2)
{
debug_flag = 1;
}
hCom =CreateFile("COM2",GENERIC_READ|GENERIC_WRITE, 0, NULL,OPEN_EXISTING, 0, NULL);
if(hCom ==INVALID_HANDLE_VALUE)
{
myprintf("open the com1 error\n");
return -1;
}
while(1)
{
getmessage();
parsemessage();
responsemessag();
}
return 0;
}