说明：  Variant转换成Byte数组，单精度浮点型数据转换为16进制的字符串，并进行大端转小端变换，字符串转换成Byte数组，BYTE型数据转换为String型数据，四字节16进制字符串转换为32位单精度浮点型，并大端模式转为小端模式，并封装为dll
(Convert variant to byte array, single precision floating-point data to hexadecimal string, and convert big end to small end, string to byte array, byte data to string data, four byte hexadecimal string to 32-bit single precision floating-point, big end mode to small end mode, and package as DLL)