如何解压 Python 中数组的样式结构 C

Question

I am using struct.unpack to unpack a C styled struct in python. I have a working method but was expecting to optimize and tried the not working method.

C Code:

            struct __attribute__((packed))
        {
            struct
            {
                uint16_t A : 4;
                uint16_t B : 12;
            } status;

            int16_t   C;
            int16_t   D;
            int16_t   E;
            int16_t   F[4];
            float32_t G;
        } sampleStruct;

Python code:

Working:

A, B, C, D, E, F0, F1, F2, F3, G = struct.unpack('<BHhhh4hf', bytes(rx_packet[1:]))

Not working:

A, B, C, D, E, F, G = struct.unpack('<BHhhh4hf', bytes(rx_packet[1:]))

How can I correct the not working method?

Answer 1

As long as there is only one array, use an extended unpacking assignment :

#              v pack into F
A, B, C, D, E, *F, G = struct.unpack('<BHhhh4hf', bytes(rx_packet[1:]))

The *F target will create a list that contains the remainder of items that could not be matched to any previous or later targets.