从System :: String ^到const wchar_t的字符串转换*

Question

我正在尝试使用字符串参数打开文件,但是我收到以下错误:

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 *'

你怎么转换System::String ^成const wchar_t *？

Answer 1

汉斯指出,简单的转换是必要的.它看起来类似于以下内容:

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);