通过c++中的串口发送数据

我已经复制了这段代码，以便通过c++中的串行端口进行编写。它工作正常，但我现在需要知道如何将字符串转换为字节数组，因为我想写几个字符串来与arduino通信。我把代码粘贴在这里：

#include <windows.h>
#include <stdio.h>
int main()
{
// Define the five bytes to send ("hello")
char bytes_to_send[5];
bytes_to_send[0] = 104;
bytes_to_send[1] = 101;
bytes_to_send[2] = 108;
bytes_to_send[3] = 108;
bytes_to_send[4] = 111;
// Declare variables and structures
HANDLE hSerial;
DCB dcbSerialParams = {0};
COMMTIMEOUTS timeouts = {0};
// Open the highest available serial port number
fprintf(stderr, "Opening serial port...");
hSerial = CreateFile(
            "\\.\COM1", GENERIC_READ|GENERIC_WRITE, 0, NULL,
            OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL );
if (hSerial == INVALID_HANDLE_VALUE)
{
        fprintf(stderr, "Errorn");
        return 1;
}
else fprintf(stderr, "OKn");
// Set device parameters (38400 baud, 1 start bit,
// 1 stop bit, no parity)
dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
if (GetCommState(hSerial, &dcbSerialParams) == 0)
{
    fprintf(stderr, "Error getting device staten");
    CloseHandle(hSerial);
    return 1;
}
dcbSerialParams.BaudRate = CBR_38400;
dcbSerialParams.ByteSize = 8;
dcbSerialParams.StopBits = ONESTOPBIT;
dcbSerialParams.Parity = NOPARITY;
if(SetCommState(hSerial, &dcbSerialParams) == 0)
{
    fprintf(stderr, "Error setting device parametersn");
    CloseHandle(hSerial);
    return 1;
}
// Set COM port timeout settings
timeouts.ReadIntervalTimeout = 50;
timeouts.ReadTotalTimeoutConstant = 50;
timeouts.ReadTotalTimeoutMultiplier = 10;
timeouts.WriteTotalTimeoutConstant = 50;
timeouts.WriteTotalTimeoutMultiplier = 10;
if(SetCommTimeouts(hSerial, &timeouts) == 0)
{
    fprintf(stderr, "Error setting timeoutsn");
    CloseHandle(hSerial);
    return 1;
}
// Send specified text (remaining command line arguments)
DWORD bytes_written, total_bytes_written = 0;
fprintf(stderr, "Sending bytes...");
if(!WriteFile(hSerial, bytes_to_send, 5, &bytes_written, NULL))
{
    fprintf(stderr, "Errorn");
    CloseHandle(hSerial);
    return 1;
}   
fprintf(stderr, "%d bytes writtenn", bytes_written);
// Close serial port
fprintf(stderr, "Closing serial port...");
if (CloseHandle(hSerial) == 0)
{
    fprintf(stderr, "Errorn");
    return 1;
}
fprintf(stderr, "OKn");
// exit normally
return 0;
}

这是我想更改的部分：

// Define the five bytes to send ("hello")
char bytes_to_send[5];
bytes_to_send[0] = 104;
bytes_to_send[1] = 101;
bytes_to_send[2] = 108;
bytes_to_send[3] = 108;
bytes_to_send[4] = 111;

我想使用我自己的字符串和一种方法将它们转换为字节，这样我就可以通过串行端口发送它们。