c++怎么读取串口数据
时间: 2023-06-27 20:05:37 浏览: 75
要读取串口数据,你需要使用串行通信库(Serial Communication Library)来与串口进行通信。在 C++ 中,有多个可用的串行通信库,如 Boost.Asio、QtSerialPort、WinAPI 等。
以下是使用 WinAPI 的示例代码,可以读取 COM1 端口的数据:
```c++
#include <Windows.h>
#include <iostream>
int main() {
HANDLE hSerial;
DCB dcbSerialParams = { 0 };
COMMTIMEOUTS timeouts = { 0 };
DWORD dwBytesRead = 0;
char buffer[256] = { 0 };
// 打开 COM1 端口,返回一个文件句柄
hSerial = CreateFile("COM1", GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hSerial == INVALID_HANDLE_VALUE) {
std::cerr << "Failed to open COM1" << std::endl;
return 1;
}
// 配置串口参数
dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
if (!GetCommState(hSerial, &dcbSerialParams)) {
std::cerr << "Failed to get serial parameters" << std::endl;
return 1;
}
dcbSerialParams.BaudRate = CBR_9600;
dcbSerialParams.ByteSize = 8;
dcbSerialParams.StopBits = ONESTOPBIT;
dcbSerialParams.Parity = NOPARITY;
if (!SetCommState(hSerial, &dcbSerialParams)) {
std::cerr << "Failed to set serial parameters" << std::endl;
return 1;
}
// 设置读取超时时间
timeouts.ReadIntervalTimeout = 50;
timeouts.ReadTotalTimeoutConstant = 50;
timeouts.ReadTotalTimeoutMultiplier = 10;
if (!SetCommTimeouts(hSerial, &timeouts)) {
std::cerr << "Failed to set timeouts" << std::endl;
return 1;
}
// 读取数据
if (!ReadFile(hSerial, buffer, sizeof(buffer), &dwBytesRead, NULL)) {
std::cerr << "Failed to read from serial port" << std::endl;
return 1;
}
// 输出读取到的数据
std::cout << buffer << std::endl;
// 关闭串口
CloseHandle(hSerial);
return 0;
}
```
注意,以上代码仅供参考,具体实现可能因操作系统、硬件等因素而有所不同。在实际使用时,应根据具体情况进行调整。