c++ - How to call a class and its function present in so file from a C++ program in Linux

Question

Possible Duplicate:
C++ Dynamic Shared Library on Linux

I am writing a shared object say libtest.so which has a class and a function. I have another program say "Program.cpp" from which i want to call the class and its function present in the libtest.so file. I am clueless as to how to proceed. Please help.

Thanks Regards Mahesh

Answer 1

动态地，需要调用dlsym获取函数的地址，然后通过指针调用。这个语法有点棘手，因为dlsym返回 a ，并且在和指向函数的指针void*之间没有转换。void*（一些编译器确实允许它，虽然在形式上，在 C++11 之前，它需要诊断，就像 C 标准一样。）Posix 标准中推荐的解决方案是：

int (*fptr)( int );
*(void**)(&fptr) = dlsym( handle, "function_name" );

这假设指向函数的指针与指向数据的指针具有相同的大小和格式——C 或 C++ 标准不保证，但 Posix 保证。