Commonly used Windows SDK and MFC data types are as follows:
BOOLA Boolean value.
BSTRA 32-bit character pointer.
BYTEAn 8-bit integer that is not signed.
COLORREFA 32-bit value used as a color value.
DWORDA 32-bit unsigned integer or the address of a segment and its associated offset.
LONGA 32-bit signed integer.
LPARAMA 32-bit value passed as a parameter to a window procedure or callback function.
LPCSTRA 32-bit pointer to a constant character string.
LPSTRA 32-bit pointer to a character string.
LPCTSTRA 32-bit pointer to a constant character string that is portable for Unicode and DBCS.
LPTSTRA 32-bit pointer to a character string that is portable for Unicode and DBCS.
LPVOIDA 32-bit pointer to an unspecified type.
LRESULTA 32-bit value returned from a window procedure or callback function.
UINTA 16-bit unsigned integer on Windows versions 3.0 and 3.1; a 32-bit unsigned integer on Win32.
WNDPROCA 32-bit pointer to a window procedure.
WORDA 16-bit unsigned integer.
WPARAMA 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:
POSITIONA value used to denote the position of an element in a collection; used by MFC collection classes.
LPCRECTA 32-bit pointer to a constant (nonmodifiable) RECT structure.