写一段C++ 读取串口的代码
时间: 2023-11-28 14:48:56 浏览: 39
以下是一个简单的C++代码示例,用于读取串口:
```cpp
#include <iostream>
#include <Windows.h>
int main()
{
HANDLE hSerial;
DCB dcbSerialParams = { 0 };
COMMTIMEOUTS timeouts = { 0 };
char buffer[256];
DWORD bytesRead;
// 打开串口
hSerial = CreateFile("COM1", GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hSerial == INVALID_HANDLE_VALUE)
{
std::cerr << "Unable to open serial port!" << std::endl;
return 1;
}
// 配置串口参数
dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
if (!GetCommState(hSerial, &dcbSerialParams))
{
std::cerr << "Error getting device state!" << std::endl;
CloseHandle(hSerial);
return 1;
}
dcbSerialParams.BaudRate = CBR_9600; // 波特率
dcbSerialParams.ByteSize = 8; // 数据位
dcbSerialParams.Parity = NOPARITY; // 校验位
dcbSerialParams.StopBits = ONESTOPBIT;// 停止位
if (!SetCommState(hSerial, &dcbSerialParams))
{
std::cerr << "Error setting device parameters!" << std::endl;
CloseHandle(hSerial);
return 1;
}
// 配置串口读取超时时间
timeouts.ReadIntervalTimeout = 50;
timeouts.ReadTotalTimeoutConstant = 50;
timeouts.ReadTotalTimeoutMultiplier = 10;
timeouts.WriteTotalTimeoutConstant = 50;
timeouts.WriteTotalTimeoutMultiplier = 10;
if (!SetCommTimeouts(hSerial, &timeouts))
{
std::cerr << "Error setting timeouts!" << std::endl;
CloseHandle(hSerial);
return 1;
}
// 读取串口数据
while (true)
{
if (!ReadFile(hSerial, buffer, sizeof(buffer), &bytesRead, NULL))
{
std::cerr << "Error reading from device!" << std::endl;
break;
}
if (bytesRead > 0)
{
buffer[bytesRead] = '\0';
std::cout << buffer;
}
}
// 关闭串口
CloseHandle(hSerial);
return 0;
}
```
需要注意的是,该代码只适用于Windows操作系统。如果需要在其他操作系统上读取串口,需要使用不同的API函数。
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