从so文件访问成员函数 [英] Access member function from so file

问题描述

我有一个.so和标题，其中有一个类，其中所有成员都是虚拟的

我希望在我的主要使用该类及其功能



我尝试跟随，但它给我分段错误



我无法访问.so来改变它



我尝试过：

I have a .so and header which has a class that all member of that are virtual
and I want to use the class and its functions in my main

I try following but it gives me segmentation fault

I haven't access to .so to change it

What I have tried:

CLASS_NAME * i;
void * h = dlopen("./LIBNAME.so",RTLD_NOW);
i = (CLASS_NAME *)dlsym(h, "CLASS_NAME");

i->Create(1);//member function

推荐答案

您将获得细分当 i NULL 时出错。检查是否加载库并使符号成功：

You will get a segmentation fault when i is NULL. Check if loading the library and getting the symbol was successful:

CLASS_NAME * i = NULL;
void * h = dlopen("./LIBNAME.so",RTLD_NOW);
// Get error message string upon errors
char *err = dlerror();
if (!h)
{
    // Report error here.
}
else
{
    i = (CLASS_NAME *)dlsym(h, "CLASS_NAME");
    if ((err = dlerror()) != NULL)
    {
        // Report error here.
    }
    else if (i)
    {
        i->Create(1);
    }
}

另见 dlopen（3） - Linux手册页 [ ^ ]。



您是否有使用动态加载的具体原因？如果没有，只需将您的应用程序与库链接。

See also dlopen(3) - Linux man page[^].

Is there any specific reason that you are using dynamic loading? If not, just link your application with the library.

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