STL API的差异(当我将平台从x64切换到x86时,VS2017)

我有这个简单的readtextfile(完整路径)函数:

std::wstring CEngine::load_text_file(std::wstring &full_path)
{
    std::wstring buffer = m_text_file_cache[full_path];

    if (buffer.empty()) // Load file:
    {
        std::wifstream wif(full_path);

        wif.seekg(0, std::ios::end);
        buffer.resize(wif.tellg()); // On Debug/Release x86: Warning C4244: 'argument': conversion from 'std::streamoff' to 'const unsigned int', possible loss of data
        wif.seekg(0);
        wif.read(buffer.data() , buffer.size()); // On Debug/Release x86: Error C2664: 'std::basic_istream<wchar_t,std::char_traits<wchar_t>> &std::basic_istream<wchar_t,std::char_traits<wchar_t>>::read(_Elem *,std::streamsize)': cannot convert argument 1 from 'const wchar_t *' to 'wchar_t *'

        m_text_file_cache[full_path] = buffer;
    }

    return buffer;
}

• m_text_file_cache 只是一个STD::MAP缓存以减少磁盘I/O忽略它。

当我编译到x64(主轨)时没有问题,但当我编译到x86(出于好奇)时,有两个问题在代码中用注释标记:警告C4244&error C2664。