将String ^转换为wstring C ++ [英] Convert a String^ to 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!
推荐答案
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.
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