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;

};