单字节对齐

一、Visual Studio环境、Keil环境

#pragma pack (1)

二、Linux环境gcc

#define PACKED __attribute__((packed))

struct PACKED Gprs
{
 unsigned short head;
 unsigned char flag;
};

typedef struct _UsrPhrase
{
    
    char key;
    int x;

} __attribute__((packed)) UsrPhrase;

struct __attribute__((packed)) GprsWeight
{
unsigned short head;
unsigned char flag;
unsigned char company;
unsigned short addr;
unsigned short driver;
unsigned int weight;
unsigned int time;
unsigned int package;
unsigned char checksum;
};