AssimpException: Error importing file: Unable to open file. File paths containing Chinese characters are not supported.

[YIOxOIY]

If the executable program file is in the Chinese directory.

[YIOxOIY]

`/*

Open Asset Import Library (assimp)

Copyright (c) 2006-2017, assimp team

All rights reserved.

Redistribution and use of this software in source and binary forms,
with or without modification, are permitted provided that the following
conditions are met:

• Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

• Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
  materials provided with the distribution.

• Neither the name of the assimp team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the assimp team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

/
/* @file Default implementation of IOSystem using the standard C file functions */

#include "StringComparison.h"

#include <assimp/DefaultIOSystem.h>
#include <assimp/DefaultIOStream.h>
#include <assimp/DefaultLogger.hpp>
#include <assimp/ai_assert.h>
#include <stdlib.h>

#include <windows.h>

using namespace Assimp;

const std::wstring wdummy;

static std::wstring Utf8ToWide(const char* in) {
if (nullptr == in) {
return wdummy;
}

UINT codePage = GetACP();

int size = MultiByteToWideChar(codePage, 0, in, -1, nullptr, 0);
// size includes terminating null; std::wstring adds null automatically
std::wstring out(static_cast<size_t>(size) - 1, L'\0');
MultiByteToWideChar(codePage, 0, in, -1, &out[0], size);

return out;

}

const std::string dummy;

static std::string WideToUtf8(const wchar_t* in) {
if (nullptr == in) {
return dummy;
}
int size = WideCharToMultiByte(CP_UTF8, 0, in, -1, nullptr, 0, nullptr, nullptr);
// size includes terminating null; std::string adds null automatically
std::string out(static_cast<size_t>(size) - 1, '\0');
WideCharToMultiByte(CP_UTF8, 0, in, -1, &out[0], size, nullptr, nullptr);

return out;

}
// ------------------------------------------------------------------------------------------------
// Constructor.
DefaultIOSystem::DefaultIOSystem()
{
// nothing to do here
}

// ------------------------------------------------------------------------------------------------
// Destructor.
DefaultIOSystem::~DefaultIOSystem()
{
// nothing to do here
}

// ------------------------------------------------------------------------------------------------
// Tests for the existence of a file at the given path.
bool DefaultIOSystem::Exists( const char* pFile) const
{
struct __stat64 filestat;
if (_wstat64(Utf8ToWide(pFile).c_str(), &filestat) != 0) {
return false;
}

return true;

}

// ------------------------------------------------------------------------------------------------
// Open a new file with a given path.
IOStream* DefaultIOSystem::Open( const char* strFile, const char* strMode)
{
ai_assert(strFile != nullptr);
ai_assert(strMode != nullptr);
FILE *file;

std::wstring name = Utf8ToWide(strFile);
if (name.empty()) {
    return nullptr;
}
file = ::_wfopen(name.c_str(), Utf8ToWide(strMode).c_str());

if (!file) {
    return nullptr;
}

return new DefaultIOStream(file, (std::string) strFile);

}

// ------------------------------------------------------------------------------------------------
// Closes the given file and releases all resources associated with it.
void DefaultIOSystem::Close( IOStream* pFile)
{
delete pFile;
}

// ------------------------------------------------------------------------------------------------
// Returns the operation specific directory separator
char DefaultIOSystem::getOsSeparator() const
{
#ifndef _WIN32
return '/';
#else
return '\';
#endif
}

// ------------------------------------------------------------------------------------------------
// IOSystem default implementation (ComparePaths isn't a pure virtual function)
bool IOSystem::ComparePaths (const char* one, const char* second) const
{
return !ASSIMP_stricmp(one,second);
}

// maximum path length
// XXX http://insanecoding.blogspot.com/2007/11/pathmax-simply-isnt.html
#ifdef PATH_MAX

define PATHLIMIT PATH_MAX

#else

define PATHLIMIT 4096

#endif

// ------------------------------------------------------------------------------------------------
// Convert a relative path into an absolute path
inline void MakeAbsolutePath (const char* in, char* _out)
{
ai_assert(in && _out);
char* ret;
#if defined( _MSC_VER ) || defined( MINGW32 )
ret = ::_fullpath( _out, in, PATHLIMIT );
#else
// use realpath
ret = realpath(in, _out);
#endif
if(!ret) {
// preserve the input path, maybe someone else is able to fix
// the path before it is accessed (e.g. our file system filter)
DefaultLogger::get()->warn("Invalid path: "+std::string(in));
strcpy(_out,in);
}
}

// ------------------------------------------------------------------------------------------------
// DefaultIOSystem's more specialized implementation
bool DefaultIOSystem::ComparePaths (const char* one, const char* second) const
{
// chances are quite good both paths are formatted identically,
// so we can hopefully return here already
if( !ASSIMP_stricmp(one,second) )
return true;

char temp1[PATHLIMIT];
char temp2[PATHLIMIT];

MakeAbsolutePath (one, temp1);
MakeAbsolutePath (second, temp2);

return !ASSIMP_stricmp(temp1,temp2);

}

// ------------------------------------------------------------------------------------------------
std::string DefaultIOSystem::fileName( const std::string &path )
{
std::string ret = path;
std::size_t last = ret.find_last_of("\/");
if (last != std::string::npos) ret = ret.substr(last + 1);
return ret;
}

// ------------------------------------------------------------------------------------------------
std::string DefaultIOSystem::completeBaseName( const std::string &path )
{
std::string ret = fileName(path);
std::size_t pos = ret.find_last_of('.');
if(pos != ret.npos) ret = ret.substr(0, pos);
return ret;
}

// ------------------------------------------------------------------------------------------------
std::string DefaultIOSystem::absolutePath( const std::string &path )
{
std::string ret = path;
std::size_t last = ret.find_last_of("\/");
if (last != std::string::npos) ret = ret.substr(0, last);
return ret;
}

// ------------------------------------------------------------------------------------------------

#undef PATHLIMIT
`

[YIOxOIY]

Modified the relevant code, but only in c++ projects, it works correctly. Does not work properly in unity.