以浮点或双精度形式获取字节值。

Posted 2021-02-27

This routine can be used to copy the byte values of a float or double. The "isBigEndian" variable needs to be determined (most PCs are little-endian, whereas most embedded microprocessors are big-endian). Instead of using unsigned chars, it can be useful to do a "typedef unsigned char UINT8" and simply use UINT8 as the variable type.

float aFloat = anotherFloat; // Could be a double instead
unsigned char bytes[sizeof(float)];
unsigned char *byte = (unsigned char *) &aFloat;
 
if(isBigEndian)
{
    for (i=0; i<sizeof(float); i++)
    {
        bytes[i] = *byte;
        byte++;
    }
}
else
{
    for (i=sizeof(float)-1; i>=0; i--)
    {
        bytes[i] = *byte;
        byte++;
    }
}