@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: Copies count bytes of src to dest. If the source and destination overlap, the behavior of memcpy is undefined. Use memmove to handle overlapping regions. !!!!C# Signature: [DllImport("msvcrt.dll", EntryPoint = "memcpy", CallingConvention = CallingConvention.Cdecl, SetLastError = false)] public static extern IntPtr memcpy(IntPtr dest, IntPtr src, UIntPtr count); !!!!VB.NET Signature: <DllImport("msvcrt.dll", EntryPoint:="memcpy", CallingConvention:=CallingConvention.Cdecl)> _ Public Shared Sub CopyMemory(ByVal dest As IntPtr, ByVal src As IntPtr, ByVal count As Integer) End Sub !!!!VB Signature: Declare Function memcpy Lib "msvcrt.dll" ( _ ByVal dest As Any, _ ByVal src As Any, _ ByVal count As Long) _ as Long !!!!Return Value: The value of dest. !!!!User-Defined Types: None. !!!!Alternative Managed API: System.Buffer.BlockCopy, Marshal.Copy and Array.Copy provide similar services, but require one or two managed arrays instead of pointers. !!!!Notes: None. !!!!Tips & Tricks: Please add some! !!!!Sample Code VB.Net: Imports System.Runtime.InteropServices Sub Main() Dim managedArray1 As Char() = ("Ciao").ToCharArray Dim size As Integer = Marshal.SizeOf(managedArray1(0)) * managedArray1.Length Dim pnt1 As IntPtr = Marshal.AllocHGlobal(size) Dim pnt2 As IntPtr = Marshal.AllocHGlobal(size) Dim managedArray2(managedArray1.Length - 1) As Char Try Marshal.Copy(managedArray1, 0, pnt1, managedArray1.Length) '----MemCpy CopyMemory(pnt2, pnt1, size * 2) '---- Marshal.Copy(pnt2, managedArray2, 0, managedArray2.Length) Finally Marshal.FreeHGlobal(pnt1) Marshal.FreeHGlobal(pnt2) End Try Dim value As String = New String(managedArray2) Console.WriteLine(">>" + value + "<<") End Sub !!!!Sample Code C#: public static Bitmap Clone(Bitmap src) { // get source image size int width = src.Width; int height = src.Height; // lock source bitmap data BitmapData srcData = src.LockBits( new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, src.PixelFormat); // create new image Bitmap dst = new Bitmap(width, height, src.PixelFormat); // lock destination bitmap data BitmapData dstData = dst.LockBits( new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, dst.PixelFormat); memcpy(dstData.Scan0, srcData.Scan0, new UIntPtr((uint)height * (uint)srcData.Stride)); // unlock both images dst.UnlockBits(dstData); src.UnlockBits(srcData); return dst; } Documentation: memcpy@msdn on MSDN
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