C++使用 unicode 名称保存文件问题 - 如何以跨平台方式正确保存 UTF-8 文件名？
我想保存一个名为 Привет Мир.jpg 的文件 我收到一个字符串（例如从文件中读取）（其中包含 unicode），但我的 C++ 代码将其保存为 ÐÑивеÑ
I want to save a file with name Привет Мир.jpg I receive a string (read it from file for example) (with unicode in it) but my C++ code saves it as ÐÑÐ¸Ð²ÐµÑ ÐиÑ.jpg
What shall I do to save it correctly? (btw if I just save that string into file it saves correctly, meaning only the way I save filename is some whay wrong. How to fix this?)
Here is my code for file saving:
void file_service::save_string_into_file( std::string contents, std::string name )
{
std::string pathToUsers = this->root_path.string() + "/users/";
boost::filesystem::path users_path ( this->root_path / "users/" );
users_directory_path = users_path;
general_util->create_directory(users_directory_path);
std::ofstream datFile;
name = users_directory_path.string() + name;
datFile.open(name.c_str(), std::ofstream::binary | std::ofstream::trunc | std::ofstream::out );
datFile.write(contents.c_str(), contents.length());
datFile.close();
}
where
void general_utils::create_directory( boost::filesystem::path path )
{
if (boost::filesystem::exists( path ))
{
return;
}
else
{
boost::system::error_code returnedError;
boost::filesystem::create_directories( path, returnedError );
if ( returnedError )
{
throw std::runtime_error("problem creating directory");
}
}
}
Update: with help I now have
void file_service::save_string_into_file( std::string contents, std::string s_name )
{
boost::filesystem::path users_path ( this->root_path / "users" );
users_directory_path = users_path;
general_util->create_directory(users_directory_path);
boost::filesystem::ofstream datFile;
boost::filesystem::path name (users_directory_path / s_name);
datFile.open(name, std::ofstream::binary | std::ofstream::trunc | std::ofstream::out );
datFile.write(contents.c_str(), contents.length());
datFile.close();
}
But when I save file it saves its file name as Привет Мир.jpg so.. What shall I do now?
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C++ 标准库不支持 Unicode。因此，您必须使用支持 Unicode 的库（如 Boost.Filesystem）。
或者，您必须处理特定于平台的问题。 Windows 支持 UTF-16，因此如果您有 UTF-8 字符串，则需要将它们转换为 UTF-16 (std::wstring)。然后将它们作为文件名传递给 iostream 文件打开函数。 Visual Studio 版本的文件流可以采用
wchar_t*作为文件名。The C++ standard library is not Unicode aware. Therefore, you must use a library (like Boost.Filesystem) that is Unicode aware.
Alternatively, you have to deal with platform-specific issues. Windows supports UTF-16, so if you have UTF-8 strings, you need to convert them to UTF-16 (std::wstring). Then you pass those as filenames to the iostream file opening functions. Visual Studio's version of the file streams can take a
wchar_t*for the filename.