string - 在vc++中将 'System::String ^'转换为 'const char *'

Question

如何在vc++中将'System::String ^'转换为'const char *'？

我的代码:
String ^Result1= "C:/Users/Dev/Desktop/imag.jpg";IplImage *img1 = cvLoadImage(Result1, 1);
如果我喜欢上面的方法，它将产生以下错误。
error C2664: 'cvLoadImage' : cannot convert parameter 1 from 'System::String ^' to 'const char *'
请帮我。

Answer 1

就像这样:How to convert from System::String* to Char* in Visual C++

System::String ^ str = "Hello world\n";

//method 1
pin_ptr<const wchar_t> str1 = PtrToStringChars(str);
wprintf(str1);  

//method 2
char* str2 = (char*)Marshal::StringToHGlobalAnsi(str).ToPointer();
printf(str2);
Marshal::FreeHGlobal((IntPtr)str2);

//method 3
CString str3(str); 
wprintf(str3);

//method 4
#if _MSC_VER > 1499 // Visual C++ 2008 only
marshal_context ^ context = gcnew marshal_context();
const char* str4 = context->marshal_as<const char*>(str);
puts(str4);
delete context;
#endif