示例1：

       #include <openssl/dso.h>

       #include <openssl/bio.h>

       int    main()

       {

              DSO              *d;

              void              (*f1)();

              void              (*f2)();

              BIO        *(*BIO_newx)(BIO_METHOD *a);

BIO        *(*BIO_freex)(BIO_METHOD *a);

              BIO        *test;

      

              d=DSO_new();

              d=DSO_load(d,"libeay32",NULL,0);

              f1=DSO_bind_func(d,"BIO_new");

f2=DSO_bind_var(d,"BIO_free");

              BIO_newx=(BIO *(*)(BIO_METHOD *))f1;

BIO_freex=(BIO *(*)(BIO_METHOD *))f2;

              test=BIO_newx(BIO_s_file());

              BIO_set_fp(test,stdout,BIO_NOCLOSE);

              BIO_puts(test,"abd\n\n");

              BIO_freex(test);

              DSO_free(d);

              return 0;

       }

       本例动态加载libeay32动态库，获取BIO_new和BIO_free的地址并调用。

       示例2：

       #include <openssl/dso.h>

       #include <openssl/bio.h>

       int    main()

       {

              DSO       *d;

              void       (*f)();

              BIO        *(*BIO_newx)(BIO_METHOD *a);

              BIO        *test;

              char       *load_name;

              const char      *loaded_name;

              int           flags;

      

d=DSO_new();

#if 0

DSO_set_name_converter

DSO_ctrl(d,DSO_CTRL_SET_FLAGS,DSO_FLAG_NO_NAME_TRANSLATION,NULL);

DSO_ctrl(d,DSO_CTRL_SET_FLAGS,DSO_FLAG_NAME_TRANSLATION_EXT_ONLY,NULL);

DSO_ctrl(d,DSO_CTRL_SET_FLAGS,DSO_FLAG_GLOBAL_SYMBOLS,NULL);

/* 最好写成libeay32而不是libeay32.dll，除非前面调用了DSO_ctrl(d,DSO_CTRL_SET_FLAGS,DSO_FLAG_NO_NAME_TRANSLATION,NULL)否则它会加载libeay32.dll.dll

*/

load_name=DSO_merge(d,"libeay32","D:\\zcp\\OpenSSL\\openssl-0.9.8b\\out32dll\\Debug");

#endif

              d=DSO_load(d,"libeay32",NULL,0);

              if(d==NULL)

              {

                     printf("err");

                     return -1;

              }

              loaded_name=DSO_get_loaded_filename(d);

              if(loaded_name!=NULL)

              {

                     printf("loaded file is %s\n",loaded_name);

      

              }

              flags=DSO_flags(d);

              printf("current falgs is %d\n",flags);

              DSO_up_ref(d);

              f=(void (*)())DSO_bind_var(d,"BIO_new");

              BIO_newx=(BIO *(*)(BIO_METHOD *))f;

              test=BIO_newx(BIO_s_file());

              BIO_set_fp(test,stdout,BIO_NOCLOSE);

              BIO_puts(test,"abd\n\n");

              BIO_free(test);

              DSO_free(d);

              printf("handle in dso number is : %d\n",d->meth_data->num);

              DSO_free(d);

              printf("handle in dso number is : %d\n",d->meth_data->num);

              return 0;

       }

       本例主要演示了DSO的控制函数。