从System :: String ^到const wchar_t的字符串转换* [英] String conversion from System::String ^ to const wchar_t *

问题描述

我正在尝试使用字符串参数打开文件，但是出现以下错误:

I'm trying to open a file using a string parameter, however I'm getting the following error:

error C2664: 'void std::basic_ifstream<_Elem,_Traits>::open(const wchar_t *,std::ios_base::openmode,int)' : cannot convert parameter 1 from 'System::String ^' to 'const wchar_t *'

如何将 System :: String ^ 转换为 const wchar_t * ?

推荐答案

正如汉斯所指出的，简单的转换是必要的.它看起来类似于以下内容:

As Hans points out, simple conversion is necessary. It would look similar to the following:

System::String ^str = L"Blah Blah";
pin_ptr<const wchar_t> convertedValue = PtrToStringChars(str);  // <-- #include <vcclr.h>
const wchar_t *constValue = convertedValue;                     // <-- Unnecessary, but to be completely verbose
void std::basic_ifstream<_Elem, _Traits>::open(constValue, mode, i);

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