#include "tchar.h"

#include int main()

{

/*****************************打開串口*************************************/

HANDLE hCom;//全局變量，串口句柄

hCom = CreateFile(_T("COM3"),//COM3口

GENERIC_READ | GENERIC_WRITE,//允許讀和寫

0,//獨占方式

NULL,

OPEN_EXISTING,//打開而不是創建

0,//同步方式

//FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERAPPLE,//重疊方式

NULL);

if(hCom == (HANDLE)-1)

{

printf("打開COM失敗！");

return 0;

}

/****************配置串口***************/

SetupComm(hCom, 20480, 20480);//輸入緩沖區和輸出緩沖區的大小都是20480

COMMTIMEOUTS TimeOuts;

TimeOuts.ReadIntervalTimeout = 1000;//設定讀超時

TimeOuts.ReadTotalTimeoutMultiplier = 500;

TimeOuts.ReadTotalTimeoutConstant = 5000;

TimeOuts.WriteTotalTimeoutMultiplier = 500;//設定寫超時

TimeOuts.WriteTotalTimeoutConstant = 2000;

SetCommTimeouts(hCom, &TimeOuts);//設置超時

DCB dcb;

GetCommState(hCom, &dcb);

dcb.BaudRate = 115200;//波特率為115200

dcb.ByteSize = 8;//每個字節有8位

dcb.Parity = NOPARITY;//無奇偶校驗位

dcb.StopBits = TWOSTOPBITS;//兩個停止位

dcb.fParity = FALSE;

dcb.fNull = FALSE;

SetCommState(hCom, &dcb);

PurgeComm(hCom, PURGE_TXCLEAR|PURGE_RXCLEAR);//在讀寫串口之前清空緩沖區

/********同步寫串口********/

int i;

unsigned char sendData[256] = {0};//寫入串口緩存區的數組

for(i=0; i<16; i++)

{

sendData[i] = i;

}

DWORD dwWriteLen = 0;

if(!WriteFile(hCom, sendData, 16, &dwWriteLen, NULL))

{

printf("串口發送數據失敗！

");

}

printf("串口發送數據成功！

");

printf("發送的數據為:

");

for(i=0; i<16; i++)

{

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

}

printf("

");

/***********關閉串口***********/

CloseHandle(hCom);

std::cout << "Hello World!

";

return 0;

}

運行效果：

配套VS2017工程下載地址：https://download.csdn.net/download/qinrenzhi/10774388