C/C++ ×Ö½Ú¶ÔÆëÎÊÌâ
VCÖÐÏÂÃ漸¸ö½á¹¹Ìå´óС·Ö±ðÊǶàÉÙÄØ
struct MyStruct
{
double m4;
char m1;
int m3£»
};
struct MyStruct {
char m1;
double m4;
int m3;
};
#pragma pack(push) //±£´æ¶ÔÆë״̬
#pragma pack(16) //ÉèÖÃΪ16×Ö½Ú¶ÔÆë
struct test
{
char m1;
int m3;
double m4;
};
#pragma pack(pop)//»Ö¸´¶ÔÆë״̬
Èç¹ûÄãµÄ´ð°¸²»ÊÇ16£¬24ºÍ16£¬ÏàÐÅÏÂÃæµÄÄÚÈݶÔÄãºÜÓаïÖú¡£
1¡¢sizeofÓ¦ÓÃÔڽṹÉϵÄÇé¿ö
Çë¿´ÏÂÃæµÄ½á¹¹£º
struct MyStruct
{
double dda1;
char dda;
int type
};
¶Ô½á¹¹MyStruct²ÉÓÃsizeof»á³öÏÖʲô½á¹ûÄØ£¿sizeof(MyStruct)Ϊ¶àÉÙÄØ£¿Ò²ÐíÄã»áÕâÑùÇó£º
sizeof(MyStruct)=sizeof(double)+sizeof(char)+sizeof(int)=13
µ«Êǵ±ÔÚVCÖвâÊÔÉÏÃæ½á¹¹µÄ´óСʱ£¬Äã»á·¢ÏÖsizeof(MyStruct)Ϊ16¡£ÄãÖªµÀΪʲôÔÚVCÖлáµÃ³öÕâÑùÒ»¸ö½á¹ûÂð£¿
Æäʵ£¬ÕâÊÇVC¶Ô±äÁ¿´æ´¢µÄÒ»¸öÌØÊâ´¦Àí¡£ÎªÁËÌá¸ßCPUµÄ´æ´¢Ëٶȣ¬VC¶ÔһЩ±äÁ¿µÄÆðʼµØÖ·×öÁË“¶ÔÆë”´¦Àí¡£
¢ÙÔÚĬÈÏÇé¿öÏ£¬VC¹æ¶¨½á¹¹Ìå¸÷³ÉÔ±±äÁ¿´æ·ÅµÄÆðʼµØÖ·Ïà¶ÔÓڽṹµÄÆðʼµØÖ·µÄÆ«ÒÆÁ¿±ØÐëΪ¸Ã±äÁ¿µÄÀàÐÍËùÕ¼ÓõÄ×Ö½ÚÊýµÄ±¶Êý¡£
ÏÂÃæÁгö³£ÓÃÀàÐ͵ĶÔÆ뷽ʽ(vc6.0,32λϵͳ)¡£
ÀàÐÍ ¶ÔÆ뷽ʽ£¨±äÁ¿´æ·ÅµÄÆðʼµØÖ·Ïà¶ÔÓڽṹµÄÆðʼµØÖ·µÄÆ«ÒÆÁ¿£©
Char Æ«ÒÆÁ¿±ØÐëΪsizeof(char)¼´1µÄ±¶Êý
Short Æ«ÒÆÁ¿±ØÐëΪsizeof(short)¼´2µÄ±¶Êý
int Æ«ÒÆÁ¿±ØÐëΪsizeof(int)¼´4µÄ±¶Êý
float Æ«ÒÆÁ¿±ØÐëΪsizeof(float)¼´4µÄ±¶Êý
double Æ«ÒÆÁ¿±ØÐëΪsizeof(double)¼´8µÄ±¶Êý
¸÷³ÉÔ±±äÁ¿ÔÚ´æ·ÅµÄʱºò¸ù¾ÝÔڽṹÖгöÏÖµÄ˳ÐòÒÀ´ÎÉêÇë¿Õ¼ä£¬Í¬Ê±°´ÕÕÉÏÃæµÄ¶ÔÆ뷽ʽµ÷ÕûλÖ㬿ÕȱµÄ×Ö½ÚVC»á×Ô¶¯Ìî³ä¡£
¢Ú ͬʱVCΪÁËÈ·±£½á¹¹µ
Ïà¹ØÎĵµ£º
¿¼²éÒ»¸ö³õ¼¶Ç¶Èëʽϵͳ¿ª·¢ÈËÔ±µÄC»ù±¾¹¦£¬¸½Óдð°¸ÌâÄ¿ÓÉ×ÊÉîǶÈëʽϵͳר¼ÒÄⶨ,Ä¿µÄÊÇ¿¼²éÈëÃż¶µÄǶÈëʽÈí¼þ¿ª·¢ÈËÔ± Gavin ShawÌṩÏêϸ½â´ð
±àÕß°´:·Ç³£»ù±¾¹ØÓÚCÓïÑÔµÄÎÊÌâ,Ò»¸öÐÅÏ¢Àà(¼ÆËã»ú,×ÊѶ¹¤³Ì,µç×Ó¹¤³Ì, ͨÐŹ¤³Ì)רҵµÄ±¾¿Æ±ÏÒµÉúÓ¦¸Ã´ïµ½µÄˮƽ¡£ÌâÄ¿²»ÄÑ,È«²¿¶¼ÄÜ¿ìËٵشðÍ꣬µ±È»Ò²ÐèÒªÒ»¶¨µ ......
ÕâһϵÁÐÎÄÕÂÊÇÎÒ¹¹½¨C/C++²å¼þ¿ª·¢¿ò¼Ü¿ª·Å¿ò¼ÜµÄ¹ý³Ì¡£ºóÃæ»áÒ»Ö±¸üУ¬Ö±ÖÁ¹¹½¨Íê³É¡£
¡¶¹¹½¨×Ô¼ºµÄC/C++²å¼þ¿ª·¢¿ò¼Ü£¨Ò»£©——³õ²½ÉèÏë¡·
¡¶¹¹½¨×Ô¼ºµÄC/C++²å¼þ¿ª·¢¿ò¼Ü£¨¶þ£©——×ÜÌ幦ÄÜ¡·
¡¶
¹¹½¨×Ô¼ºµÄC/C++²å¼þ¿ª·¢¿ò¼Ü£¨Èý£©——×ÜÌå½á¹¹
¡·
¡¶¹¹½¨×Ô¼ºµÄC/C++²å¼þ¿ª·¢¿ò¼ ......
http://blog.csdn.net/eroswang/archive/2009/06/12/4265046.aspx
1,·ÀÖ¹Ò»¸öÍ·Îļþ±»Öظ´°üº¬
#ifndef COMDEF_H
#define COMDEF_H
//Í·ÎļþÄÚÈÝ
#endif
2,ÖØж¨ÒåһЩÀàÐÍ,·ÀÖ¹ÓÉÓÚ¸÷ÖÖƽ̨ºÍ±àÒëÆ÷µÄ²»Í¬,¶ø²úÉúµÄÀàÐÍ×Ö½ÚÊý²îÒì,·½±ãÒÆÖ²¡£
typedef unsigned char boolea ......
±¾ÎĵÄÄÚÈÝÊÇ Win32 API£¨ÌرðÊǽø³Ì¡¢Ï̺߳͹²ÏíÄÚ´æ·þÎñ£©µ½ POWER ÉÏ Linux µÄÓ³Éä¡£±¾ÎÄ¿ÉÒÔ°ïÖúÄúÈ·¶¨ÄÄÖÖÓ³Éä·þÎñ×îÊʺÏÄúµÄÐèÒª¡£×÷ÕßÏòÄúÏêϸ½éÉÜÁËËûÔÚÒÆÖ² Win32 C/C++ Ó¦ÓóÌÐòʱÓöµ½µÄ API Ó³Éä¡£
¸ÅÊö
Óкܶ෽ʽ¿ÉÒÔ½« Win32 C/C++ Ó¦ÓóÌÐòÒÆÖ²ºÍǨÒƵ½ pSeries ƽ̨¡£Äú¿ÉÒÔʹÓÃÃâ·ÑÈí¼þ»òÕßµÚÈý·½¹¤¾ßÀ´ ......