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ÔÚmytestso.cÎļþÖУ¬´úÂëÈçÏ£º
#include <stdio.h>
#include <stdlib.h>
int GetMax(int a, int b)
{
if (a >= b)
return a;

return b;
}
int GetInt(char* psztxt)
{
if (0 == psztxt)
return -1;

return atoi(psztxt);
}

È»ºóʹÓÃÏÂÁÐÃüÁî½øÐбàÒ룺
gcc -fpic -shared mytestso.c -o mytestso.so
-fpic ʹÊä³öµÄ¶ÔÏóÄ£¿éÊǰ´ÕÕ¿ÉÖØ¶¨Î»µØÖ··½Ê½Éú³ÉµÄ
±àÒë³É¹¦ºó£¬µ±Ç°Ä¿Â¼ÏÂÓÐmytestso.so£¬´ËʱÒѳɹ¦´´½¨¹²Ïí¿âmytestso.so¡£
Èý¡¢Ê¹Óù²Ïí¿â
¡¡¡¡¹²Ïí¿âÖеĺ¯Êý¿É±»Ö÷³ÌÐò¼ÓÔØ²¢Ö´ÐУ¬µ«ÊDz»±Ø±àÒëʱÁ´½Óµ½Ö÷³ÌÐòµÄÄ¿±êÎļþÖС£Ö÷³ÌÐòʹÓù²Ïí¿âÖеĺ¯Êýʱ£¬ÐèÒªÊÂÏÈÖªµÀËù°üº¬µÄº¯ÊýµÄÃû³Æ£¨×Ö·û´®£©£¬È»ºó¸ù¾ÝÆäÃû³Æ»ñµÃ¸Ãº¯ÊýµÄÆðʼµØÖ·£¨º¯ÊýÖ¸Õ룩£¬È»ºó¼´¿ÉʹÓøú¯ÊýÖ¸ÕëʹÓøú¯Êý¡£
ÔÚmytest.cÎļþÖУ¬´úÂëÈçÏ£º
#include <dlfcn.h>
#include <stdio.h>
int main(int argc, char* argv[])
{
void* pdlhandle;
char* pszerror;

int (*GetMax)(int a, int b);
int (*GetInt)(char* psztxt);

int a, b;
char* psztxt = "1024";

// open mytestso.so
pdlhandle = dlopen("./mytestso.so", RTLD_LAZY);
pszerror = dlerror();
if (0 != pszerror) {
printf("%s\n", pszerror);
exit(1);
}

// get GetMax func
GetMax = dlsym(pdlhandle, "GetMax");
pszerror = dlerror();
if (0 != pszerror) {
printf("%s\n", pszerror);
exit(1);
}

// get GetInt func
GetInt = dlsym(pdlhandle, "GetInt");
pszerror = dlerror();
if (0 != pszerror) {
printf("%s\n", pszerror);
exit(1);
}

// call fun
a = 200;
b = 600;
printf("max=%d\n", GetMax(a, b));
printf("txt=%d\n", GetInt(psztxt));

// close mytestso.so
dlclose(pdlhandle);
}

È»ºóʹÓÃÈçÏÂÃüÁî½øÐбàÒ룺
gcc mytest.c -ldl -o mytest
-ldlÑ¡Ï±íʾÉú³ÉµÄ¶ÔÏóÄ£¿éÐèҪʹÓù²Ïí¿â
(1)dlopen()
µÚÒ»¸ö²ÎÊý£ºÖ¸¶¨¹²Ïí¿âµÄÃû³Æ£¬½«»áÔÚÏÂÃæÎ»ÖòéÕÒÖ¸¶¨µÄ¹²Ïí¿â¡£
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