将 Platform::String 转换为 std::string [英] Convert Platform::String to std::string
问题描述
我在 Windows Phone 8 项目的 Cocos2dx 游戏中从我的 C++ WinRT 组件中的 C# 组件回调中得到 String^
包含一些印度语言字符.
I am getting String^
which Contains some Indian language characters in a callback from C# Component in my C++ WinRT Component in a Cocos2dx game for Windows Phone 8 project.
每当我将其转换为 std::string
时,印地语和其他字符都会变成垃圾字符.我无法找到发生这种情况的原因.
Whenever I convert it to std::string
the Hindi and other characters turn in to garbage characters. I'm not able to find why this is happening.
这是一个示例代码,我刚刚在这里定义了 Platform::String^
但考虑到它是从 C# 组件传递给 C++ WinRT 组件
Here is a sample code and I have just defined Platform::String^
here but consider it's passed to C++ WinRT Component
from C# Component
String^ str = L"विकास, વિકાસ, ਵਿਕਾਸ, Vikas";
std::wstring wsstr(str->Data());
std::string res(wsstr.begin(), wsstr.end());
推荐答案
请参阅此答案以获得更好的便携性解决方案.
see this answer for a better portable solution.
问题是 std::string
只保存 8 位字符数据,而您的 Platform::String^
保存 Unicode 数据.Windows 提供函数 WideCharToMultiByte
和 MultiByteToWideChar
来回转换:
The problem is that std::string
only holds 8-bit character data and your Platform::String^
holds Unicode data. Windows provides functions WideCharToMultiByte
and MultiByteToWideChar
to convert back and forth:
std::string make_string(const std::wstring& wstring)
{
auto wideData = wstring.c_str();
int bufferSize = WideCharToMultiByte(CP_UTF8, 0, wideData, -1, nullptr, 0, NULL, NULL);
auto utf8 = std::make_unique<char[]>(bufferSize);
if (0 == WideCharToMultiByte(CP_UTF8, 0, wideData, -1, utf8.get(), bufferSize, NULL, NULL))
throw std::exception("Can't convert string to UTF8");
return std::string(utf8.get());
}
std::wstring make_wstring(const std::string& string)
{
auto utf8Data = string.c_str();
int bufferSize = MultiByteToWideChar(CP_UTF8, 0, utf8Data, -1, nullptr, 0);
auto wide = std::make_unique<wchar_t[]>(bufferSize);
if (0 == MultiByteToWideChar(CP_UTF8, 0, utf8Data, -1, wide.get(), bufferSize))
throw std::exception("Can't convert string to Unicode");
return std::wstring(wide.get());
}
void Test()
{
Platform::String^ str = L"विकास, વિકાસ, ਵਿਕਾਸ, Vikas";
std::wstring wsstr(str->Data());
auto utf8Str = make_string(wsstr); // UTF8-encoded text
wsstr = make_wstring(utf8Str); // same as original text
}
这篇关于将 Platform::String 转换为 std::string的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!