榆林阿里云代理商：api编写vc串口

编写VC串口的API可以使用Windows的串口通信API函数。以下是一个示例程序，展示了如何使用这些函数来进行串口通信。

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

HANDLE hSerial;

bool openSerialPort(const char* portName, int baudRate)
{
    // 打开串口
    hSerial = CreateFile(portName, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
    if (hSerial == INVALID_HANDLE_VALUE) {
        return false;
    }

    // 配置串口参数
    DCB dcbSerialParams = {0};
    dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
    if (!GetCommState(hSerial, &dcbSerialParams)) {
        CloseHandle(hSerial);
        return false;
    }
    dcbSerialParams.BaudRate = baudRate;
    dcbSerialParams.ByteSize = 8;          // 8位数据位
    dcbSerialParams.StopBits = ONESTOPBIT; // 1位停止位
    dcbSerialParams.Parity = NOPARITY;     // 无校验位
    if (!SetCommState(hSerial, &dcbSerialParams)) {
        CloseHandle(hSerial);
        return false;
    }

    // 配置串口超时时间
    COMMTIMEOUTS timeouts = {0};
    timeouts.ReadIntervalTimeout = 50;
    timeouts.ReadTotalTimeoutConstant = 50;
    timeouts.ReadTotalTimeoutMultiplier = 10;
    timeouts.WriteTotalTimeoutConstant = 50;
    timeouts.WriteTotalTimeoutMultiplier = 10;
    if (!SetCommTimeouts(hSerial, &timeouts)) {
        CloseHandle(hSerial);
        return false;
    }

    return true;
}

bool closeSerialPort()
{
    // 关闭串口
    if (hSerial != INVALID_HANDLE_VALUE) {
        CloseHandle(hSerial);
        return true;
    }
    return false;
}

bool readSerialPort(char* buffer, int bufferSize)
{
    // 读取串口数据
    DWORD bytesRead;
    if (!ReadFile(hSerial, buffer, bufferSize, &bytesRead, NULL)) {
        return false;
    }
  
    // 添加null终止符
    buffer[bytesRead] = '';

    return true;
}

bool writeSerialPort(const char* buffer, int bufferSize)
{
    // 写入串口数据
    DWORD bytesWritten;
    if (!WriteFile(hSerial, buffer, bufferSize, &bytesWritten, NULL)) {
        return false;
    }

    return true;
}

int main()
{
    if (openSerialPort("COM1", 9600)) {
        printf("Serial port opened successfully.n");

        // 读取串口数据
        char readBuffer[256];
        if (readSerialPort(readBuffer, sizeof(readBuffer))) {
            printf("Read: %sn", readBuffer);
        } else {
            printf("Failed to read from serial port.n");
        }

        // 写入串口数据
        char writeBuffer[] = "Hello, world!";
        if (writeSerialPort(writeBuffer, sizeof(writeBuffer))) {
            printf("Write: %sn", writeBuffer);
        } else {
            printf("Failed to write to serial port.n");
        }

        closeSerialPort();
    } else {
        printf("Failed to open serial port.n");
    }

    return 0;
}

该程序首先使用openSerialPort函数打开串口，其中portName参数为串口名称（如COM1），baudRate参数为波特率（如9600）。然后使用readSerialPort函数读取串口数据，该函数将读取到的数据保存在buffer中。接下来使用writeSerialPort函数将数据写入串口，其中buffer为需要写入的数据。最后使用closeSerialPort函数关闭串口。

请注意，编写串口通信程序需要确保串口参数和超时设置正确，并根据实际需求进行适当的错误处理。

编写VC串口的API可以使用Windows的串口通信函数，以下是一个简单的示例代码：

#include <Windows.h>

HANDLE hSerial;

bool OpenSerialPort(const char* portName, int baudrate)
{
    hSerial = CreateFile(portName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hSerial == INVALID_HANDLE_VALUE)
    {
        return false;
    }

    DCB dcbSerialParams = { 0 };
    dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
    if (!GetCommState(hSerial, &dcbSerialParams))
    {
        CloseHandle(hSerial);
        return false;
    }

    dcbSerialParams.BaudRate = baudrate;
    dcbSerialParams.ByteSize = 8;
    dcbSerialParams.StopBits = ONESTOPBIT;
    dcbSerialParams.Parity = NOPARITY;

    if (!SetCommState(hSerial, &dcbSerialParams))
    {
        CloseHandle(hSerial);
        return false;
    }

    COMMTIMEOUTS timeouts = { 0 };
    timeouts.ReadIntervalTimeout = 50;
    timeouts.ReadTotalTimeoutConstant = 50;
    timeouts.ReadTotalTimeoutMultiplier = 10;
    timeouts.WriteTotalTimeoutConstant = 50;
    timeouts.WriteTotalTimeoutMultiplier = 10;

    if (!SetCommTimeouts(hSerial, &timeouts))
    {
        CloseHandle(hSerial);
        return false;
    }

    return true;
}

void CloseSerialPort()
{
    CloseHandle(hSerial);
}

bool WriteSerialPort(unsigned char* data, int length)
{
    DWORD bytesWritten;
    if (!WriteFile(hSerial, data, length, &bytesWritten, NULL))
    {
        return false;
    }

    return true;
}

bool ReadSerialPort(unsigned char* buffer, int bufferSize, int& bytesRead)
{
    DWORD bytesToRead;
    if (!PeekNamedPipe(hSerial, NULL, 0, NULL, &bytesToRead, NULL))
    {
        return false;
    }

    if (bytesToRead > 0)
    {
        if (!ReadFile(hSerial, buffer, min(bufferSize, bytesToRead), (LPDWORD)&bytesRead, NULL))
        {
            return false;
        }
    }

    return true;
}

使用示例：

int main()
{
    if (OpenSerialPort("COM1", 9600))
    {
        unsigned char sendData[] = { 0x01, 0x02, 0x03 };
        if (WriteSerialPort(sendData, sizeof(sendData)))
        {
            unsigned char receiveData[256];
            int bytesRead;
            if (ReadSerialPort(receiveData, sizeof(receiveData), bytesRead))
            {
                // 处理接收到的数据
            }
        }

        CloseSerialPort();
    }

    return 0;
}

以上代码是一个简单的串口通信示例，你可以根据自己的需求进行进一步的封装和扩展。注意要替换OpenSerialPort函数中的portName参数为你的串口名字（如"COM1"）和baudrate参数为你的波特率（如9600）。