[心得] 因為在這裡找到好多資料希望對想了解RS232的人有幫助

[sgvacr (小兵)]

分享一下 有錯請大力的噓下去謝謝你

/*
This is a test program for receiving data from other computer.
RS-232 Test:

RS-232 male
-------------
\ 1 2 3 4 5 /
 \ 6 7 8 9 /
  ---------

To send and to receive data on your computer
when you connect pin 2 and pin 3 togeter.

To connect your RS-232 like this
   -----------------------
  \     ---  ---          /
   \ 1  |2|--|3|  4   5  /
    \   ---  ---        /
     \ 6    7    8  9  /
       ---------------

Albert Liu
10,10,2010
*/

#include <windows.h>
#include <stdio.h>
#include <conio.h>  //for _getch() and _kbhit();
#include <string>
#include <cmath>

using namespace std;

int main(){

        //To declare a handle for your comport
        HANDLE hComm;

        //To declare an object for setting the Comport
        DCB dcb;

        //To declare a string for saving temp string.
        string Temp;

                //To declare some variables for receiving massage
        char inbuff[1024];
        DWORD nBytesRead,dwError;
        COMSTAT cs;
                //end// for receiving

                //To declare some variables for keybord control
        int ky,end=FALSE;
                //end// for keybord control

        //To declare a delay timer.
        int T_dela=0;

                //To declare some variables for sending massage
        const char *SendData;
        unsigned long lrc, BS;
        char str1[]="I am a test string.";
        printf("%s\n",str1);
                //end// for sending

        //To open COM3 for this program
        hComm = CreateFile("COM3",  //usually "COM1" or "COM2"
                GENERIC_READ | GENERIC_WRITE,
                0,
                NULL,
                OPEN_EXISTING,
                0,
                0);

        //It will turn off the program
        //when it can't find any comport to connect
        if (hComm == INVALID_HANDLE_VALUE){
                printf("wrong port connection.\n");
                return 0;
        }

        //To get COM3 state
        GetCommState(hComm,&dcb);

                //To set COM3 parameters
        dcb.BaudRate = CBR_9600;
        dcb.fOutxCtsFlow = FALSE;
        dcb.fRtsControl = RTS_CONTROL_DISABLE;
        dcb.fDtrControl = DTR_CONTROL_DISABLE;
        dcb.fOutxDsrFlow = FALSE;
        dcb.fOutX = FALSE;
        dcb.fInX = FALSE;
        dcb.ByteSize = 8;
        dcb.Parity = NOPARITY;
        dcb.StopBits = ONESTOPBIT;
                //end// COM3 parameters

        //To set the parameters to COM3 now
        if (!SetCommState(hComm, &dcb)){
                printf("setting error.\n");
                return 0;
        }

        //Clearn COM3 data
        PurgeComm(hComm, PURGE_RXCLEAR);

        //To give Temp a string.
        //you can set input here
        Temp=str1;
        SendData = Temp.c_str();
        BS=strlen(SendData);

        //sending data now
        WriteFile(hComm, SendData,BS,&lrc,NULL);

        //To count how many time have to delay for sending data.
        T_dela=(int)ceil((double)ceil((double)(BS*8)/6)*8/(dcb.BaudRate*0.001));
                          // 1 char = 8 bit so BS*8
        Sleep(T_dela);

        //to find the error or receiving COM3's state.
        ClearCommError(hComm,&dwError,&cs);
        if (cs.cbInQue > sizeof(inbuff)){
                PurgeComm(hComm, PURGE_RXCLEAR);
                printf("your massage is too big\n");
                return 0;
        }

        //To read the data from COM3 when you push "Esc".
        while (!end){
                //when you hit the key bord
                if (_kbhit()){
                        //to get the button you hit
                        //'\x1B' = "Esc"
                        if((ky = _getch())=='\x1B'){
                                //to read the data from COM3 now
                                ReadFile(hComm,
                                         inbuff,
                                         cs.cbInQue,
                                         &nBytesRead,
                                         NULL);
                                //break;
                                end = TRUE;
                        }
                }
        }

        //To add a char '\0' to the end of the string.
        inbuff[cs.cbInQue]='\0';
        printf("I get this massage = %s \n",inbuff);

        return 0;
}

我測試好多次了如果不是貼上來被換了字應該可以動
希望對你有幫助

按"Esc"之後會秀出
I get this massage = I am a test string.
記得把你的RS-232要接腳
2(RXD 接收資料)跟3(TXD傳送資料) 接起來喔(用電線接起來>.<)

確認以上(硬體軟體)都對了以後如果編譯還是不能過
MS Win2003 R2 PSDK 去 google 搜索這個安裝一下

參考資料：
C++ Builder與RS-232 串列通訊控制 文魁資訊
串列資料傳送技術入門  建宏出版社
Window 下之馬達控制入門 全華科技圖書股份有限公司
PTT.cc C/C++ 板
PTT的大大 clarkman
http://msdn.microsoft.com/en-us/library/ms810467.aspx
--
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◆ From: 140.135.96.181
※ 編輯: sgvacr          來自: 140.135.96.181       (10/11 01:04)
※ 編輯: sgvacr          來自: 140.135.96.181       (10/11 01:11)
※ 編輯: sgvacr          來自: 140.135.96.181       (10/11 01:17)
推 purpose:推兵哥用心。
→ purpose:這軟體好像可以模擬？  http://com0com.sourceforge.net/
推 loveme00835:也推~ 因為平常都是用C#來寫, 換成WIN32反而看不懂
推 purpose:接電線那一步，對我來說很恐怖
推 saxontai:沒那麼恐怖啦 XD
推 bdvstg:可以模擬  我之前開發都是用那個(com0com)
→ hilorrk:推p大 自從燒壞一台4個port的示波器後 我就決定走資訊類了
推 yauhh:推兵哥用心