Hooking Example (case 2. class method hooking)

This is an example of hooking a class function.

This article doesn't have many examples of hooking c ++ classes.

The following code:

Class TestClass {

Public:

…

int myPrintf(const std::string & id, const int & value);

…

}

Hook code:

int TestClass::myPrintf(const std::string & id, const int & value) {

    typedef int (TestClass::*HookFunction)(const std::string & id, const int & value);

    static HookFunction orgMethod = 0;

    if (orgMethod == 0) {

        void *tmpPtr = dlsym(RTLD_NEXT, "Mangling Name");

        memcpy(&orgMethod, &tmpPtr, sizeof(void *));

    }

   

    int orgRetValue;

    orgRetValue = (this->*orgMethod)(id, value);

    return orgRetValue;

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