写了一个很简单API串口编程的源代码，调试通过，希望给需要的人有所帮助

最新推荐文章于 2024-08-29 15:22:08 发布

jjx72

最新推荐文章于 2024-08-29 15:22:08 发布

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本文链接：https://blog.youkuaiyun.com/jjx72/article/details/5731001

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本文提供了一个使用Windows API进行串口通信的C++示例程序。该程序演示了如何打开串口、设置波特率等参数，并从指定的串口（如COM4）读取数据。此外，还展示了如何处理可能发生的错误。

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// comconsole.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <string>
#include <windows.h>
void set_up_serial_port(HANDLE h, long baud);
int main(int argc, char* argv[])
{   char str[100]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
    char str1[100]={'0','0','0','0',0,0,0,0,0,0,0,0,0,0,0,0,0};
    char* pChar=&str[0];
    DWORD nNumberOfBytesToRead=100;
DWORD wCount;//读取的字节数
    LPDWORD lpEvtMask=NULL;
LPOVERLAPPED lpOverlapped=NULL;
    HANDLE hCom;
    DWORD dwError;
    hCom = CreateFile("COM4", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
    if (hCom == (HANDLE)0xFFFFFFFF)
{
      dwError = GetLastError();
      MessageBox(NULL, "dwError", NULL, MB_OK);
}
    set_up_serial_port(hCom, 9600);
    if(FALSE==ReadFile(hCom,str, nNumberOfBytesToRead, &wCount,0))
{
  dwError = GetLastError();
  printf("%d",dwError);
  MessageBox(NULL, "dwError", NULL, MB_OK);
}
for(int i=0; i<wCount; i++)
{
      printf("%s/n",str);
}
printf("Hello World!/n");
    CloseHandle(hCom);

return 0;
}

void set_up_serial_port(HANDLE h, long baud)
{
DCB properties; /* Properties of serial port */

/* Get the properties */
GetCommState(h, &properties);

/* Set the baud rate */
switch(baud)
{
case 1200:
properties.BaudRate = CBR_1200;
break;
case 2400:
properties.BaudRate = CBR_2400;
break;
case 4800:
properties.BaudRate = CBR_4800;
break;
case 9600:
properties.BaudRate = CBR_9600;
break;
case 14400:
properties.BaudRate = CBR_14400;
break;
case 19200:
properties.BaudRate = CBR_19200;
break;
case 38400:
properties.BaudRate = CBR_38400;
break;
default:
fprintf(stderr, "Invalid baud rate: %ld/n", baud);
exit(0);
break;
}

/* Set the other properties */
properties.Parity = NOPARITY;
properties.ByteSize = 8;
properties.StopBits = ONESTOPBIT;

SetCommState(h, &properties);

return;
}