how to transfer data between thread

I wrote a program using windows API to show some curves and text.

The calculation is a thread started by main window.

Curve and text's informations contains some data like position, color, strings....

I want to use windows message to send data to figure window. But message API function has two parameters: wParam, lParam, which refer to two integer pointer. I found it seems that fortran cannot transfer the adress of other type or struct to a integer, while an integer adress cannot be recieded by pointer of other types.

Is that right?

So, what should i do?