c串口程序接收数据长度总是为0

只看该作者 · 2023-8-17 09:43

#define _CRT_SECURE_NO_WARNINGS
#include <string.h>
#include <conio.h>
#include "tchar.h"

#include<stdio.h>
#include<windows.h>

int main()
{
            HANDLE hCom1;
            COMMTIMEOUTS TimeOuts;
            DCB dcb1;
            DWORD i ;
            DWORD wCount =4;
         DWORD wCount1;


      unsigned char str[8];

hCom1 = CreateFile("COM4",
      GENERIC_READ | GENERIC_WRITE,
      0,
      NULL,
      OPEN_EXISTING,
      0,
      NULL);

      if (hCom1==INVALID_HANDLE_VALUE )
{
      printf("read open failed\n");

}
else
{
      printf("read open successed\n");
}
SetupComm(hCom1, 20480, 20480);

//COMMTIMEOUTS TimeOuts;
TimeOuts.ReadIntervalTimeout =100;
TimeOuts.ReadTotalTimeoutMultiplier =500;
TimeOuts.ReadTotalTimeoutConstant = 5000;
TimeOuts.WriteTotalTimeoutMultiplier = 500;
TimeOuts.WriteTotalTimeoutConstant = 2000;
SetCommTimeouts(hCom1, &TimeOuts);

//DCB dcb1;
GetCommState(hCom1, &dcb1);
dcb1.BaudRate = 115200;
dcb1.ByteSize = 8;//一个字节8bit
dcb1.Parity = NOPARITY;//无校验
dcb1.StopBits = ONESTOPBIT;//1位停止位
dcb1.fParity = FALSE;
dcb1.fNull = FALSE;
SetCommState(hCom1, &dcb1);

PurgeComm(hCom1, PURGE_TXCLEAR|PURGE_RXCLEAR);

      if(!ReadFile(hCom1, str, wCount, &wCount1, NULL))
      {
         printf("read failed!");

      }
            else
            {
      printf("read successed!");

      printf("wCount1:%d\n", wCount1);


            printf("read data is");
            for(i=0;i<wCount1;i++)
      {

      printf("%02X", str[i]);
      }
            }



CloseHandle(hCom1);

// system("pause");

}
代码贴上来了，wCount1总是为0，不知道哪里出了问题，有没有大佬帮忙看下

1万 · 2023-8-27 13:41

看代码没啥问题