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  1. PO
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    <p>I came up with my own solution using the following code:</p> <pre><code>#include &lt;ios&gt; #include &lt;QIODevice&gt; class QStdStreamBuf : public std::streambuf { public: QStdStreamBuf(QIODevice *dev) : std::streambuf(), m_dev(dev) { // Initialize get pointer. This should be zero so that underflow is called upon first read. this-&gt;setg(0, 0, 0); } protected: virtual std::streamsize xsgetn(std::streambuf::char_type *str, std::streamsize n) { return m_dev-&gt;read(str, n); } virtual std::streamsize xsputn(const std::streambuf::char_type *str, std::streamsize n) { return m_dev-&gt;write(str, n); } virtual std::streambuf::pos_type seekoff(std::streambuf::off_type off, std::ios_base::seekdir dir, std::ios_base::openmode /*__mode*/) { switch(dir) { case std::ios_base::beg: break; case std::ios_base::end: off = m_dev-&gt;size() - off; break; case std::ios_base::cur: off = m_dev-&gt;pos() + off; break; } if(m_dev-&gt;seek(off)) return m_dev-&gt;pos(); else return std::streambuf::pos_type(std::streambuf::off_type(-1)); } virtual std::streambuf::pos_type seekpos(std::streambuf::pos_type off, std::ios_base::openmode /*__mode*/) { if(m_dev-&gt;seek(off)) return m_dev-&gt;pos(); else return std::streambuf::pos_type(std::streambuf::off_type(-1)); } virtual std::streambuf::int_type underflow() { // Read enough bytes to fill the buffer. std::streamsize len = sgetn(m_inbuf, sizeof(m_inbuf)/sizeof(m_inbuf[0])); // Since the input buffer content is now valid (or is new) // the get pointer should be initialized (or reset). setg(m_inbuf, m_inbuf, m_inbuf + len); // If nothing was read, then the end is here. if(len == 0) return traits_type::eof(); // Return the first character. return traits_type::not_eof(m_inbuf[0]); } private: static const std::streamsize BUFFER_SIZE = 1024; std::streambuf::char_type m_inbuf[BUFFER_SIZE]; QIODevice *m_dev; }; class QStdIStream : public std::istream { public: QStdIStream(QIODevice *dev) : std::istream(m_buf = new QStdStreamBuf(dev)) {} virtual ~QStdIStream() { rdbuf(0); delete m_buf; } private: QStdStreamBuf * m_buf; }; </code></pre> <p>I works fine for reading local files. I haven't tested it for writing files. This code is surely not perfect but it works.</p>
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    1. POHow to use a QFile with std::iostream?
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    1. USthirtythreeforty
    1. USAndreas Roth
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