做的IntPtr在C＃.NET指向字符串值 [英] make IntPtr in C#.NET point to string value

问题描述

我使用的有 StringHandle 字段，它是一个的IntPtr 值重新presents一类 LPCWSTR 在C ++中。

I am using a class which has StringHandle field which is an IntPtr value that represents a LPCWSTR in C++.

internal IntPtr StringHandle; // LPCWSTR

说现在我有一个字符串：字符串x =ABCDEFG

如何使用String把手指向字符串的开头，这样它像C ++ LPCWSTR？

How can I use the String handle to point to the beginning of the String so that it is like C++ LPCWSTR ?

推荐答案

您需要将字符串复制到非托管内存，然后再拿到的IntPtr 从该位置。你可以这样做喜欢的：

You need to copy the string to the unmanaged memory first and then get the IntPtr from that location. You can do so like:

IntPtr strPtr = Marshal.StringToHGlobalUni(x);

此外，您还需要确保以释放非托管内存：

also, you need to make sure to free the unmanaged memory:

Marshal.FreeHGlobal(strPtr);

这是最好的做这一切在一个try /最后。

it's best to do all this in a try/finally.

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