GetWindowLongPtr function to retrieve the handle to application
Hello world
I used the following line to get the handle to the window of my windProc application
HINSTANCE appHandle = GetWindowLongPtr (hWnd, GWLP_HINSTANCE);
promptly, which returned an error saying that "a long value cannot be used to initialize an entity of type HINSTANCE. But when I used the word HINSTANCE as return type, it ends up being fine.
HINSTANCE appHandle = (HINSTANCE) GetWindowLongPtr (hWnd, GWLP_HINSTANCE);
I know that the return value is changed when I do this. But I'm curious to know why I have to do exclusively. HINSTANCE is not a long_ptr type? In fact the same thing happened earlier when I tried to assign the function of GetStockBrush to app.hbrBackground. He obliged to specify the return type as HBRUSH.
Tags: Windows
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