c# byte[] 转换为 IntPtr？
作者：admin 发布于：2014-9-16 10:39 Tuesday 分类：.NET
有几种方法可以访问与字节数组相对应的 IntPtr。
{
byte[] test = new byte[5];
fixed (byte* p = &test[0])
{
*p = 0xff;
}
}
第二种，可以使用 GCHandle 来获得对象。
using System.Runtime.InteropServices;
byte[] test = new byte[5];
GCHandle hObject = GCHandle.Alloc(test, GCHandleType.Pinned);
IntPtr pObject = hObject.AddrOfPinnedObject();
if(hObject.IsAllocated)
hObject.Free();
第三种， 通过 LocalAlloc 创建内存块并将数据封送处理到该内存块。
[DllImport("coredll.dll",SetLastError=true)]
public static extern IntPtr LocalAlloc(uint uFlags, uint uBytes);
[DllImport("coredll.dll",SetLastError=true)]
public static extern IntPtr LocalFree(IntPtr hMem);
[DllImport("coredll.dll",SetLastError=true)]
public static extern IntPtr LocalReAlloc(IntPtr hMem, uint uBytes, uint fuFlags);
public const uint LMEM_FIXED = 0;
public const uint LMEM_MOVEABLE = 2;
public const uint LMEM_ZEROINIT = 0x0040;
byte[] test = new byte[5];
IntPtr p = LocalAlloc(LMEM_FIXED | LMEM_ZEROINIT, (uint)test.Length);
if (p == IntPtr.Zero)
{
throw new OutOfMemoryException();
}
else
{
Marshal.Copy(test, 0, p, test.Length);
}