Calling non-static functions from WndProc()

[ejohns85]

Here is my class:

class MyWindow
{
public:
// Attributes
int num_squares;

// Functions
MyWindow()
{
    num_squares = 0;
    // Other stuff like registering the window class
};
static LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM w_param, LPARAM l_param);
void DrawSquare();

};

Suppose that every time I click on the window, I want it to increment the value of num_squares. Then, I want it to draw that number of squares onto the window. Therefore, DrawSquare() must be able to access the value of num_squares. This means that it cannot be static. This then means that it cannot be called by WndProc...

I can see that your class CCallBack would work in a static sense, but how can you let CCallBack know that value of num_squares?

Thanks again!