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CopyMemory (urlmon)
Copies unmanaged memory from one location to another.

C# Signature:

    [DllImport("kernel32.dll", EntryPoint="RtlCopyMemory")]
    static extern void CopyMemory(IntPtr Destination, IntPtr Source, uint Length);

VB.NET Signature:

    <DllImport("kernel32.dll", EntryPoint:="RtlCopyMemory")> _
    Friend Shared Sub CopyMemory(ByVal Destination As IntPtr, ByVal Source As IntPtr, ByVal Length As UInteger)
    End Sub

VB Signature:

    Declare Sub CopyMemory Alias "RtlCopyMemory" Lib "kernel32.dll" (hpvDest As Any, hpvSource As Any, ByVal cbCopy As Long)

User-Defined Types:


Alternative Managed API:

Do you know one? Please contribute it!

    static extern unsafe void CopyMemory(byte* Destination, byte* Source, int Length);

It seems that using the EntryPoint - compiles and runs, yet doesn't always copy the memory. Without the entry point - it does.



RtlCopyMemory is (sometimes?) just a C macro expanding to memcpy, not a real exported DLL function.

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Sample Code:

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CopyMemory on MSDN

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