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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);
}
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gcc -fpic -shared mytestso.c -o mytestso.so
-fpic ʹÊä³öµÄ¶ÔÏóÄ£¿éÊǰ´ÕÕ¿ÉÖØ¶¨Î»µØÖ··½Ê½Éú³ÉµÄ
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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);
}
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gcc mytest.c -ldl -o mytest
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(1)dlopen()
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