[스크랩] 7-2. 윈도우 기반 직렬 양방향 통신

 < 2개의 콘솔에서 "Hello World" 메시지를 주고 받기 > - C++ 작성

 

/* 서버 콘솔 */

#include<stdio.h>

#include<windows.h>

 

int main(void)

{

        char szPort[15];                                      //포트명을 저장할 변수

        wsprintf(szPort, "COM%d", 2);                //2번 포트로 통신

 

        //Comm device를 File Open과 같은 방법으로 연결

        HANDLE m_hComm=NULL;

        m_hComm=CreateFile(szPort,

                                       GENERIC_READ|GENERIC_WRITE,

                                       0,

                                       NULL,

                                       OPEN_EXISTING,

                                       FILE_ATTRIBUTE_NORMAL,

                                       NULL);

 

        if(m_hComm==INVALID_HANDLE_VALUE)

        {

                printf("(!)Failed to create a Comm Device file.");

                return FALSE;

        }

        DCB dcb;

        dcb.DCBlength=sizeof(DCB);

 

        GetCommState(m_hComm, &dcb);                //DCB초기값

 

        dcb.BaudRate=9600;                            //전송속도

        dcb.ByteSize=8;                                 //테이터비트 4-8

        dcb.Parity=0;                                    //Parity 0-4=no, odd, even, mark, space

        dcb.StopBits=0;                                //Stopbit 0,1,1=1,1.5,2

 

        SetCommState(m_hComm, &dcb);       //DCB변경

 

        OVERLAPPED osWrite;

        osWrite.Offset=0;

        osWrite.OffsetHigh=0;

        osWrite.hEvent=CreateEvent(NULL, TRUE, FALSE, NULL);

 

        OVERLAPPED osRead;

        osRead.Offset=0;

        osRead.OffsetHigh=0;

        osRead.hEvent=CreateEvent(NULL, TRUE, FALSE, NULL);

 

 

        char buf[100]="Hello world\r\n";

        while(1)

        {

                WriteFile(m_hComm, buf, sizeof(buf), NULL, &osWrite);

                printf("send1:%s", buf);

 

                memset(buf, '\0', sizeof(buf));

                ReadFile(m_hComm, buf, sizeof(buf), NULL, &osRead);

                printf("recv1:%s", buf);

                Sleep(1000);

        }

        CloseHandle(m_hComm);

        return 0;

}

 

=================================================================================================

/* 클라이언트 콘솔 */

#include<stdio.h>

#include<windows.h>

 

int main(void)

{

        char szPort[15];                                        //포트명을 저장할 변수

        wsprintf(szPort, "COM%d", 5);                  //2번 포트로 통신

 

        //Comm device를 File Open과 같은 방법으로 연결

        HANDLE m_hComm=NULL;

        m_hComm=CreateFile(szPort,

                                       GENERIC_READ|GENERIC_WRITE,

                                       0,

                                       NULL,

                                       OPEN_EXISTING,

                                       FILE_ATTRIBUTE_NORMAL,

                                       NULL);

 

        if(m_hComm==INVALID_HANDLE_VALUE)

        {

                printf("(!)Failed to create a Comm Device file.");

                return FALSE;

        }

 

        DCB dcb;

        dcb.DCBlength=sizeof(DCB);

 

        GetCommState(m_hComm, &dcb);                        //DCB초기값

         

        dcb.BaudRate=9600;                                        //전송속도

        dcb.ByteSize=8;                                                //테이터비트 4-8

        dcb.Parity=0;                                                //Parity 0-4=no, odd, even, mark, space

        dcb.StopBits=0;        //Stopbit 0,1,1=1,1.5,2

 

        SetCommState(m_hComm, &dcb);//DCB변경

 

        OVERLAPPED osWrite;

        osWrite.Offset=0;

        osWrite.OffsetHigh=0;

        osWrite.hEvent=CreateEvent(NULL, TRUE, FALSE, NULL);

 

        OVERLAPPED osRead;

        osRead.Offset=0;

        osRead.OffsetHigh=0;

        osRead.hEvent=CreateEvent(NULL, TRUE, FALSE, NULL);

 

 

        char buf[100];

        while(1)

        {

                memset(buf, '\0', sizeof(buf));

                ReadFile(m_hComm, buf, sizeof(buf), NULL, &osRead);

                printf("recv2:%s", buf);

 

                WriteFile(m_hComm, buf, sizeof(buf), NULL, &osWrite);

                printf("send2:%s", buf);

                Sleep(1000);

        }

        CloseHandle(m_hComm);

        return 0;

}

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