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.

This issue is beyond the scope of this site (for consumers) and to be sure, you get the best (and fastest) reply, we have to ask either on Technet (for IT Pro) or MSDN (for developers)
*

Tags: Windows

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