C# byte[] 如何转换成byte*

原创

闻缺陷则喜何志丹 2023-10-03 09:26:14 博主文章分类：C# ©著作权

文章标签 c# memcpy 取地址 unsafe 内存复制 文章分类 Html/CSS 前端开发

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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
             }
         }