While MediaInfoDLL returns metadata (Sampling Rate, Channels, Stream Size, Title...) in std::basic_string<Char>
format, I need to convert to string to be able to process it later. For example mi.Get(Stream_Audio, 0, __T("Performer"))
returns "Artist Name" in std::basic_string<Char>
format.
Can you help me?
Thank you in advance
Reading through the MediaInfoLib library's C++ code, it seems there are two possibilities. The library defines a type alias String
, and this is the type you're seeing.
First, here is the definition of the Char
and String
types:
namespace MediaInfoLib {
/* ... */
//Char types
#undef __T
#define __T(__x) __T(__x)
#if defined(UNICODE) || defined (_UNICODE)
typedef wchar_t Char; ///< Unicode/Ansi independant char
#undef __T
#define __T(__x) L ## __x
#else
typedef char Char; ///< Unicode/Ansi independant char
#undef __T
#define __T(__x) __x
#endif
typedef std::basic_string<MediaInfoLib::Char> String; ///< Unicode/Ansi independant string
/* ... */
} // end namespace
If the macro UNICODE
or _UNICODE
was defined when the library was built, then the type is std::basic_string<wchar_t>
, which is std::wstring
in the standard library .
To convert this to std::string
, please see this question: How to convert wstring into string?
The simplest answer there uses std::wstring_convert
.
If the macro UNICODE
or _UNICODE
was NOT defined when the library was built, then MediaInfoLib::Char
is the type char
, and the MediaInfoLib::String
type is std::basic_string<char>
is already std::string
. That is, in this case, the return type is already std::string .
Convert
std::basic_string<Char>
to string ... Yes, this is builtin type char
If Char
is an alias of char
, then std::basic_string<Char>
is already std::string
. No conversion is needed, since it is the same type.
MediaInfo
has ZenLib
as a dependency, which in turn has its own Ztring
. You can do something like this:
#include "ZenLib/Ztring.h"
MediaInfoLib::String mediainfoString = mi.Get(Stream_Audio, 0, __T("Performer"));
ZenLib::Ztring zenlibZtring(mediainfoString);
std::string stdString = zenlibZtring.To_UTF8(); // or To_Local()
You can be slightly more efficient by directly using Ztring
and skipping the intermediary mediainfoString
.
ps std::wstring_convert()
was deprecated in c++17 and should probably not be used.
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