将String ^转换为wstring C ++

问题描述：

我用C ++编写了一个小应用程序。 UI中有一个ListBox。而且我想将ListBox的选定项用于只能使用wstrings的算法。

I programmed a little Application in C++. There is a ListBox in the UI. And I want to use the selected Item of ListBox for an Algorithm where I can use only wstrings.

总而言之，我有两个问题：
-如何我将

All in all I have two questions: -how can I convert my

    String^ curItem = listBox2->SelectedItem->ToString();

进行wstring测试？

to a wstring test?

-在代码中^是什么意思？

-What means the ^ in the code?

非常感谢！

答

它应该像这样简单：

std::wstring result = msclr::interop::marshal_as<std::wstring>(curItem);

您还需要头文件来完成该工作：

You'll also need header files to make that work:

#include <msclr\marshal.h>
#include <msclr\marshal_cppstd.h>

这是什么 marshal_as 专业化看起来像是内部，出于好奇：

What this marshal_as specialization looks like inside, for the curious:

#include <vcclr.h>
pin_ptr<WCHAR> content = PtrToStringChars(curItem);
std::wstring result(content, curItem->Length);

之所以有效，是因为 System :: String 是内部存储为宽字符。如果您想使用 std :: string ，则必须执行Unicode转换，例如 WideCharToMultiByte 。方便地， marshal_as 会为您处理所有详细信息。

This works because System::String is stored as wide characters internally. If you wanted a std::string, you'd have to perform Unicode conversion with e.g. WideCharToMultiByte. Convenient that marshal_as handles all the details for you.

将String ^转换为wstring C ++

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