取其字节偏移是可以的：
#define OFFSET(structure, member) ( (unsigned int) &(structure.member) - (unsigned int) &(structure) )

例：
typedef struct
{
int a;
char b;
float c;
double d;
}Temp;

int main(void)
{
Temp t;

printf("%u\n", &(t) );
printf("%u\n", OFFSET(t, a) );
printf("%u\n", OFFSET(t, b) );
printf("%u\n", OFFSET(t, c) );
printf("%u\n", OFFSET(t, d) );

getch();
return 0;
}

[此贴子已经被作者于2007-9-16 1:32:12编辑过]

谢谢！

#pragma pack(1)
typedef struct
{
int a;
char b;
float c;
double d;
}Temp;
#pragma pack()