C++ 如何将 Platform::String 转换为 char*？
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How to convert Platform::String to char*?
提问by djcouchycouch
How do I convert the contents of a Platform::String to be used by functions that expect a char* based string? I'm assuming WinRT provides helper functions for this but I just can't find them.
如何转换 Platform::String 的内容以供期望基于 char* 的字符串的函数使用？我假设 WinRT 为此提供了帮助函数，但我找不到它们。
Thanks!
谢谢！
采纳答案by James McNellis
Platform::String::Data()will return a wchar_t const*pointing to the contents of the string (similar to std::wstring::c_str()). Platform::Stringrepresents an immutable string, so there's no accessor to get a wchar_t*. You'll need to copy its contents, e.g. into a std::wstring, to make changes.
Platform::String::Data()将返回一个wchar_t const*指向字符串内容的指针（类似于std::wstring::c_str()）。 Platform::String代表一个不可变的字符串，所以没有访问器来获取wchar_t*. 您需要复制其内容，例如复制到 astd::wstring中以进行更改。
There's no directway to get a char*or a char const*because Platform::Stringuses wide characters (all Metro style apps are Unicode apps). You can convert to multibyte using WideCharToMultiByte.
没有直接获取 achar*或 a 的方法，char const*因为Platform::String使用宽字符（所有 Metro 风格应用程序都是 Unicode 应用程序）。您可以使用WideCharToMultiByte.
回答by rysama
Here is a very simple way to do this in code w/o having to worry about buffer lengths. Only use this solution if you are certain you are dealing with ASCII:
这是在代码中执行此操作的一种非常简单的方法，无需担心缓冲区长度。仅当您确定要处理 ASCII 时才使用此解决方案：
Platform::String^ fooRT = "aoeu";
std::wstring fooW(fooRT->Begin());
std::string fooA(fooW.begin(), fooW.end());
const char* charStr = fooA.c_str();
Keep in mind that in this example, the char*is on the stack and will go away once it leaves scope
请记住，在此示例中，char*is 在堆栈中，一旦离开作用域就会消失
回答by Jeff McClintock
You shouldn't cast a wide character to a char, you will mangle languages using more than one byte per character, e.g. Chinese. Here is the correct method.
您不应该将宽字符转换为字符，您将使用每个字符多于一个字节来破坏语言，例如中文。这是正确的方法。
#include <cvt/wstring>
#include <codecvt>
Platform::String^ fooRT = "foo";
stdext::cvt::wstring_convert<std::codecvt_utf8<wchar_t>> convert;
std::string stringUtf8 = convert.to_bytes(fooRT->Data());
const char* rawCstring = stringUtf8.c_str();
回答by Sistr
回答by Qnan
There's the String::Datamethod returning const char16*, which is the raw unicode string.
有String::Data方法返回const char16*，它是原始 unicode 字符串。
Conversion from unicode to ascii or whatever, i.e. char16*to char*, is a different matter. You probably don't need it since most methods have their wcharversions these days.
从 unicode 到 ascii 或其他任何东西的转换，即char16*到char*，是另一回事。您可能不需要它，因为现在大多数方法都有它们的wchar版本。
