This topic lists the data types most commonly used in the Microsoft
Foundation Class Library. Most of the data types are exactly the same as those
in the Windows Software Development Kit (SDK), while others are unique to
MFC.
Commonly used Windows SDK and MFC data types are as follows:
BOOL A Boolean value.
BSTR A 32-bit character pointer.
BYTE An 8-bit integer that is not signed.
COLORREF A 32-bit value used as a color value.
DWORD A 32-bit unsigned integer or the address of a segment and its
associated offset.
LONG A 32-bit signed integer.
LPARAM A 32-bit value passed as a parameter to a window procedure
or callback function.
LPCSTR A 32-bit pointer to a constant character string.
LPSTR A 32-bit pointer to a character string.
LPCTSTR A 32-bit pointer to a constant character string that is
portable for Unicode and DBCS.
LPTSTR A 32-bit pointer to a character string that is portable for
Unicode and DBCS.
LPVOID A 32-bit pointer to an unspecified type.
LRESULT A 32-bit value returned from a window procedure or callback
function.
UINT A 16-bit unsigned integer on Windows versions 3.0 and 3.1; a
32-bit unsigned integer on Win32.
WNDPROC A 32-bit pointer to a window procedure.
WORD A 16-bit unsigned integer.
WPARAM A value passed as a parameter to a window procedure or
callback function: 16 bits on Windows versions 3.0 and 3.1; 32 bits on Win32.
Data types unique to the Microsoft Foundation Class Library include the
following:
POSITION A value used to denote the position of an element in a
collection; used by MFC collection classes.
LPCRECT A 32-bit pointer to a constant (nonmodifiable) RECT
structure.