CODEWITHSUNDEEP
c++qtshared-librariesqlibrary
Omari Celestine
Omari Celestine

Reputation: 1435

Loading library with QLibrary

I found the following code for loading libraries in Qt but I do not fully understand how it works. Could someone explain to me from: typedef int (*MyPrototype)(int, int);?

int r1 = 0;
QLibrary library("mathlib.so");
    if (!library.load())
        out << library.errorString() << endl;
    if (library.load())
        out << "library loaded" << endl;

    typedef int (*MyPrototype)(int, int);

    MyPrototype myFunction = (MyPrototype)library.resolve("add");
    if (myFunction)
        r1 = myFunction(a,b);
    else
        out << library.errorString() << endl;

Upvotes: 1

Views: 2501

Answers (1)

Ildar Gumirov
Ildar Gumirov

Reputation: 36

so or dll has function and we want to use it, so how we can call it

int add(int in_iParam1, int in_iParam2)

define function type

typedef int (*MyPrototype)(int, int);

looking for function 'add' in so file

MyPrototype myFunction = (MyPrototype)library.resolve("add");

Call function 'add' with parameters 'a' and 'b' and get result to 'r1'

r1 = myFunction(a,b);

Upvotes: 2

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