@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: Copies a block of memory from one location to another. !!!!C# Signature: [DllImport("kernel32.dll", EntryPoint = "CopyMemory", SetLastError = false)] public static extern void CopyMemory(IntPtr dest, IntPtr src, uint count); !!!!VB Signature: Public Declare Auto Sub CopyMemory lib "kernel32.dll" Alias "CopyMemory"(destination As IntPtr, source As IntPtr, length As UInteger) <DllImport("kernel32.dll", SetLastError:= True, EntryPoint:= "CopyMemory")> Public Shared Sub CopyMemory(destination As IntPtr, source As IntPtr, length As UInteger) End Sub !!!!User-Defined Types: None. !!!!Alternative Managed API: Do you know one? Please contribute it! !!!!Notes: None. !!!!Tips & Tricks: Please add some! !!!!Sample Code: // static void Main() // { // const int size = 200; // IntPtr memorySource = Marshal.AllocHGlobal(size); // IntPtr memoryTarget = Marshal.AllocHGlobal(size); // CopyMemory(memoryTarget,memorySource,size); // } [DllImport("kernel32.dll", SetLastError=true, EntryPoint="CopyMemory") public static void CopyMemory(void* destination, void* source, uint length); public static unsafe void Main() { int[] data = Enumerable.Range(1, 1000000); int size = data.Length * sizeof(int); byte[] dst = new byte[size] fixed (byte* pd = dst){ fixed(int* ps = data){ CopyMemory(pd, ps, size); } } Console.WriteLine("10 data result : {0}", BitConverter.ToString(dst, 0, 10)); Console.WriteLine("Is assuming equals : {0}", BitConverter.ToInt32(dst, 0) == data[0] && BitConverter.ToInt32(dst, dst.GetUpperBound(0) - sizeof(int)) == data[data.GetUpperBound(0)]); Console.ReadKey(); } !!!!Sample Code VB: Public Module CopyMemoryTest Public Declare Auto Sub CopyMemory lib "kernel32.dll" Alias "CopyMemory"(destination As IntPtr, source As IntPtr, length As UInteger) Public Sub Main(ParamArray args As String()) Dim source As Byte() = File.ReadAllBytes("C:\Windows\explorer.exe"), destination(source.GetUpperBound(0)) As Byte, length As UInteger = CUInt(source.Length), sourcePtr As IntPtr = Marshal.UnsafeAddrOfPinnedArrayElement(source, 0), targetPtr As IntPtr = Marshal.UnsafeAddrOfPinnedArrayElement(target, 0) Dim sw As Stopwatch = Stopwatch.StartNew() CopyMemory(targetPtr, sourcePtr, length) sw.Stop() Console.WriteLine("Total time to copy {0:N0} bytes = {1}", new TimeSpan(sw.ElapsedTicks)) Using sha = New System.Security.Cryptography.SHA512Managed Dim sourceChecksum = sha.ComputeHash(source), destinationCheksum = sha.ComputeHash(destination), isEquals = True For i = 0 To sourceChecksum.GetUpperBound(0) If sourceChecksum(i) <> destinationChecksum(i) Then Console.WriteLine("The copy memory is bad, some of data are not copied..") IsEquals = False Exit For End If Next i If isEquals Then Console.WriteLine("The copy memory is perfectly copy all bytes.") End Using Console.ReadKey().Key = ConsoleKeys.R Then Main(args) End If sw = Nothing Erase source, destination End Sub End Module //http://stackoverflow.com/questions/15975972/copy-data-from-from-intptr-to-intptr Documentation: CopyMemory@msdn on MSDN
Edit urlmon.CopyMemory
You do not have permission to change this page. If you feel this is in error, please send feedback with the contact link on the main page.