C#中内存读写操作方法

using System.Runtime.InteropServices;
using System.Text;
public class Function
{

public static byte PtrToByte( int Ptr )
{
byte b = Marshal.ReadByte( ( IntPtr ) Ptr );

return b;
}

public static char PtrToChar( int Ptr )
{
byte b = Marshal.ReadByte( ( IntPtr ) Ptr );

return ( char ) b;
}

public static short PtrToShort( int Ptr )
{
short b = Marshal.ReadInt16( ( IntPtr ) Ptr );

return b;
}

public static ushort PtrToUShort( int Ptr )
{
ushort b = ( ushort ) Marshal.ReadInt16( ( IntPtr ) Ptr );

return b;
}

public static int PtrToInt( int Ptr )
{
int b = Marshal.ReadInt32( ( IntPtr ) Ptr );

return b;
}

public static uint PtrToUInt( int Ptr )
{
uint b = ( uint ) Marshal.ReadInt32( ( IntPtr ) Ptr );

return b;
}

public static long PtrToLong( int Ptr )
{
long b = Marshal.ReadInt64( ( IntPtr ) Ptr );

return b;
}

public static ulong PtrToULong( int Ptr )
{
ulong b = ( ulong ) Marshal.ReadInt64( ( IntPtr ) Ptr );

return b;
}

// Convert an ip address stored an address to equivalent string value
public static string GetPtrToIpAddr(int intPtr, int varlen)
{
int i = 0;
StringBuilder sb = new StringBuilder(0,varlen*4);
byte[] byx = new byte[varlen];

// ip address cann't have zero value
// ip address cann't have zero length
if( ( intPtr == 0 ) || ( varlen == 0 ) ) return "";
Marshal.Copy( ( IntPtr ) intPtr , byx , 0 , varlen );
for( i = 0; i < varlen - 1; i ++ )
{
sb.Append(byx[i]);
sb.Append('.');

}
sb.Append(byx[varlen - 1]);

return sb.ToString();

}

}

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