C and C # managed to correspond to variables in unmanaged code

The following table lists the data types that are used in the Win32 API (listed in Wtypes.h) and in the C-style functions. Many unmanaged libraries contain functions that pass these data types as parameters and return values. The third column lists the corresponding. NET Framework built-in value types or classes that are used in managed code. In some cases, you can replace the types listed in this table with the same size type.

Unmanaged C language Type managed class name description for unmanaged classes in Wtypes.h

Handle	void*	System.IntPtr	32-bit
Byte	unsigned char	System.Byte	8-bit
Short	Short	System.Int16	16-bit
Word	unsigned short	System.UInt16	16-bit
Int	Int	System.Int32	32-bit
UInt	unsigned int	System.UInt32	32-bit
Long	Long	System.Int32	32-bit
bool	Long	System.Int32	32-bit
DWord	unsigned long	System.UInt32	32-bit
ULong	unsigned long	System.UInt32	32-bit
Char	Char	System.Char	Decorated with ANSI.
LPStr	char*	System.String or System.stringbuilder	Decorated with ANSI.
Lpcstr	Const char*	System.String or System.stringbuilder	Decorated with ANSI.
LPWStr	wchar_t*	System.String or System.stringbuilder	Decorated with Unicode.
Lpcwstr	Const wchar_t*	System.String or System.stringbuilder	Decorated with Unicode.
Float	Float	System.Single	32-bit
Double	Double	System.Double	64-bit