Understanding the Definition of MAKEINTRESOURCEW

Question

Looking at the Windows SDK, I found this #define directive for MAKEINTRESOURCEW:

#define MAKEINTRESOURCEW(i) ((LPWSTR)((ULONG_PTR)((WORD)(i))))

Can someone explain to me what this means? For example, what will be the value of MAKEINTRESOURCEW (0)? (1)? (-1)?

Answer 1

The result of this macro will be a pointer to a long string with a value equal to the given parameter. You can see this by reading the output of the precompiler (see / P C ++ Compiler Options). All casting is required to compile this macro result when the W [W] WSTR pointer is required, both in Win32 and x64 configurations.

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Answer 2

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#define MAKEINTRESOURCE(i)  (LPTSTR) ((DWORD) ((WORD) (i)))

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Answer 3

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Answer 4

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Another example from the Windows API: a pointer to a window procedure. Each window has a window procedure (accessed GetWindowLongwith a flag GWL_WNDPROC. However, sometimes it’s just an integer that indicates what the “view” of the window is. Then there is a CallWindowProcthat knows to distinguish between these cases.