Size of a pointer

Pointer Precision Types

The following data types are always the size of a pointer — that is, 32 bits wide in 32-bit applications, and 64 bits wide in 64-bit applications. The size is determined at compile time. When a 32-bit application runs on 64-bit Windows, these data types are still 4 bytes wide. (A 64-bit application cannot run on 32-bit Windows, so the reverse situation does not occur.)

• DWORD_PTR
• INT_PTR
• LONG_PTR
• ULONG_PTR
• UINT_PTR