Personal favorites (hosted/unmanaged, parameter conversion)

Unmanaged type in wtypes. h	Unmanaged C language type	Managed class name	Description
Handle	Void *		32-bit
Byte	Unsigned char		8-digit
Short	Short		16-bit
Word	Unsigned short		16-bit
Int	Int		32-bit
Uint	Unsigned int		32-bit
Long	Long		32-bit
Bool	Long		32-bit
DWORD	Unsigned long		32-bit
Ulong	Unsigned long		32-bit
Char	Char		It is modified with ANSI.
Lpstr	Char *	Or	It is modified with ANSI.
Lpcstr	Const char *	Or	It is modified with ANSI.
Lpwstr	Wchar_t *	Or	Use Unicode.
Lpcwstr	Const wchar_t *	Or	Use Unicode.
Float	Float		32-bit
Double	Double		64-bit