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#include <stdio.h>

struct myst {
    short i;
    long c;
    short j;
};
 
int main(void) {
    FILE *fp;
    fp = fopen("test.txt", "wb");

    struct myst ins = {0xaa, 0xbb, 0xcc};

    printf("size:%d\n", sizeof(ins));
    fwrite(&ins, sizeof(ins), 1, fp); 
    fclose(fp);
    return 0;
}

aa00 4800 bb00 0000 cc00 0000

Shredded 写了：to pack your structure into 18 bytes you will need to use the pragma pack statements

Code: [show] | [select all]

#pragma pack(push, 1)



typedef struct hd_fileheader

{

    unsigned long long magic;

    unsigned short hdata_version;

    key_num next_key_num;

}



#pragma pack(pop)

The value of magic is reversed because of the way the computer stores integers. etc.
look up
Little Endian
if you want to find out why.

Hope this has been helpful
Shredded