目标:将byte[]转成byte*以方便使用memcpy

    [DllImport("kernel32.dll", EntryPoint = "RtlCopyMemory", CharSet = CharSet.Ansi)]
        public extern static long CopyMemory(IntPtr dest, IntPtr source, int size);

      private void butTemp_Click(object sender, EventArgs e)
        {
            unsafe
            {
                byte[] by1 = new byte[4] { 1, 2, 3,4 };
                IntPtr tempMemoryPointer = Marshal.AllocHGlobal(4);   
                fixed (byte* converted = by1)
                {
                    CopyMemory(tempMemoryPointer, new IntPtr(converted), 4);
                }
                byte* p1 = (byte*)tempMemoryPointer.ToPointer();
                //此时p[0]到p[3]分别为: 1 2 3 4
            }
        }

扩展目标：取int的地址以使用memcpy

private void butTemp_Click(object sender, EventArgs e)
        {
            unsafe
            {
                int iTmp = 0x11223344;
                IntPtr tempMemoryPointer = Marshal.AllocHGlobal(4);
                int* converted = &iTmp;
                CopyMemory(tempMemoryPointer, new IntPtr(converted), 4);
                byte* p1 = (byte*)tempMemoryPointer.ToPointer();
                //此时p[0]到p[3]分别为: 0x44 0x33 0x22 0x11
            }
        }

测试环境

win7 + VS2022