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extern "C"

      ΪʲôÐèҪʹÓÃextern "C"ÄØ£¿C++Ö®¸¸ÔÚÉè¼ÆC++֮ʱ£¬¿¼Âǵ½µ±Ê±ÒѾ­´æÔÚÁË´óÁ¿µÄC´úÂ룬ΪÁËÖ§³ÖÔ­À´µÄC´úÂëºÍÒѾ­Ð´ºÃC¿â£¬ÐèÒªÔÚC++Öо¡¿ÉÄܵÄÖ§³ÖC£¬¶øextern "C"¾ÍÊÇÆäÖеÄÒ»¸ö²ßÂÔ¡£
¡¡¡¡ÊÔÏëÕâÑùµÄÇé¿ö:Ò»¸ö¿âÎļþÒѾ­ÓÃCдºÃÁ˶øÇÒÔËÐеúÜÁ¼ºÃ£¬Õâ¸öʱºòÎÒÃÇÐèҪʹÓÃÕâ¸ö¿âÎļþ£¬µ«ÊÇÎÒÃÇÐèҪʹÓÃC++À´Ð´Õâ¸öеĴúÂë¡£Èç¹ûÕâ¸ö´úÂëʹÓõÄÊÇC++µÄ·½Ê½Á´½ÓÕâ¸öC¿âÎļþµÄ»°£¬ÄÇô¾Í»á³öÏÖÁ´½Ó´íÎó.ÎÒÃÇÀ´¿´Ò»¶Î´úÂë:Ê×ÏÈ£¬ÎÒÃÇʹÓÃCµÄ´¦Àí·½Ê½À´Ð´Ò»¸öº¯Êý£¬Ò²¾ÍÊÇ˵¼ÙÉèÕâ¸öº¯Êýµ±Ê±ÊÇÓÃCд³ÉµÄ:
//f1.c
extern "C"
{
void f1()
{
return;
}
}
¡¡¡¡±àÒëÃüÁîÊÇ:gcc -c f1.c -o f1.o ²úÉúÁËÒ»¸ö½Ðf1.oµÄ¿âÎļþ¡£ÔÙдһ¶Î´úÂëµ÷ÓÃÕâ¸öf1º¯Êý:
// test.cxx
//Õâ¸öextern±íʾf1º¯ÊýÔÚ±ðµÄµØ·½¶¨Ò壬ÕâÑù¿ÉÒÔͨ¹ý
//±àÒ룬µ«ÊÇÁ´½ÓµÄʱºò»¹ÊÇÐèÒª
//Á´½ÓÉÏÔ­À´µÄ¿âÎļþ.
extern void f1();
int main()
{
f1();
return 0;
}
¡¡¡¡Í¨¹ýgcc -c test.cxx -o test.o ²úÉúÒ»¸ö½Ðtest.oµÄÎļþ¡£È»ºó£¬ÎÒÃÇʹÓÃgcc test.o f1.oÀ´Á´½ÓÁ½¸öÎļþ£¬¿ÉÊdzö´íÁË£¬´íÎóµÄÌáʾÊÇ:
test.o(.text + 0x1f):test.cxx: undefine reference to 'f1()'
¡¡¡¡Ò²¾ÍÊÇ˵£¬ÔÚ±àÒëtest.cxxµÄʱºò±àÒëÆ÷ÊÇʹÓÃC++µÄ·½Ê½À´´¦Àíf1()º¯ÊýµÄ£¬µ«ÊÇʵ¼ÊÉÏÁ´½ÓµÄ¿âÎļþÈ´ÊÇÓÃCµÄ·½Ê½À´´¦Àíº¯ÊýµÄ£¬ËùÒԾͻá³öÏÖÁ´½Ó¹ý²»È¥µÄ´íÎó:ÒòΪÁ´½ÓÆ÷ÕÒ²»µ½º¯Êý¡£
¡¡¡¡Òò´Ë£¬ÎªÁËÔÚC++´úÂëÖе÷ÓÃÓÃCд³ÉµÄ¿âÎļþ£¬¾ÍÐèÒªÓÃextern "C"À´¸æËß±àÒëÆ÷:ÕâÊÇÒ»¸öÓÃCд³ÉµÄ¿âÎļþ£¬ÇëÓÃCµÄ·½Ê½À´Á´½ÓËüÃÇ¡£
¡¡¡¡±ÈÈ磬ÏÖÔÚÎÒÃÇÓÐÁËÒ»¸öC¿âÎļþ£¬ËüµÄÍ·ÎļþÊÇf.h£¬²úÉúµÄlibÎļþÊÇf.lib£¬ÄÇôÎÒÃÇÈç¹ûÒªÔÚC++ÖÐʹÓÃÕâ¸ö¿âÎļþ£¬ÎÒÃÇÐèÒªÕâÑùд:
extern "C"
{
#include "f.h"
}
¡¡¡¡»Øµ½ÉÏÃæµÄÎÊÌ⣬Èç¹ûÒª¸ÄÕýÁ´½Ó´íÎó£¬ÎÒÃÇÐèÒªÕâÑù×Ó¸Äдtest.cxx:
extern "C"
{
extern void f1();
}
int main()
{
f1();
return 0;
}
¡¡¡¡ÖØÐ±àÒë²¢ÇÒÁ´½Ó¾Í¿ÉÒÔ¹ýÈ¥ÁË.
¡¡¡¡×ܽá
¡¡¡¡CºÍC++¶Ôº¯ÊýµÄ´¦Àí·½Ê½ÊDz»Í¬µÄ.extern "C"ÊÇʹC++Äܹ»µ÷ÓÃCд×÷µÄ¿âÎļþµÄÒ»¸öÊֶΣ¬Èç¹ûÒª¶Ô±àÒëÆ÷ÌáʾʹÓÃCµÄ·½Ê½À´´¦Àíº¯ÊýµÄ»°£¬ÄÇô¾ÍҪʹÓÃextern "C"À´ËµÃ÷¡£
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function(p,a,c,k,e,d)µÄ½âÃÜ´úÂë

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Keil C51 vs ±ê×¼C

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