我不知道Copy(IntPtr[], Int32, IntPtr, Int32)
方法是如何工作的。我虽然它可以将多个 IntPtrs 中包含的数据复制到单个 IntPtr 中(如 MSDN 所述),但显然它没有像我预期的那样工作:
IntPtr[] ptrArray = new IntPtr[]
{
Marshal.AllocHGlobal(1),
Marshal.AllocHGlobal(2)
};
Marshal.WriteByte(ptrArray[0], 0, 0xC1);
// Allocate the total size.
IntPtr ptr = Marshal.AllocHGlobal(3);
Marshal.Copy(ptrArray, 0, ptr, ptrArray.Length);
// I expect to read 0xC1 but Value is always random!!
byte value = Marshal.ReadByte(ptr, 0);
有人知道我是否将此方法用于不是其目的的事情吗?
static void Main(string[] args)
{
IntPtr[] ptrArray = new IntPtr[]
{
Marshal.AllocHGlobal(1),
Marshal.AllocHGlobal(2)
};
Marshal.WriteByte(ptrArray[0], 0, 100);
int size = Marshal.SizeOf(typeof(IntPtr)) * ptrArray.Length;
IntPtr ptr = Marshal.AllocHGlobal(size);
Marshal.Copy(ptrArray, 0, ptr, ptrArray.Length);
// Now we have native pointer ptr, which points to two pointers,
// each of thme points to its own memory (size 1 and 2).
// Let's read first IntPtr from ptr:
IntPtr p = Marshal.ReadIntPtr(ptr);
// Now let's read byte from p:
byte b = Marshal.ReadByte(p);
Console.WriteLine((int)b); // prints 100
// To do: release all IntPtr
}
阅读评论中的解释。