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POQFile Unicode path - file does not exist
 

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  1. POQFile Unicode path - file does not exist
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    <p>I write a <a href="https://addons.mozilla.org/en-US/firefox/addon/youtube-mp3-podcaster/" rel="nofollow">Firefox plugin</a> that calls out to external programs to get work done :). The trouble is Firefox can't handle Unicode when you're passing arguments, so I'm having to jump through some hoops when I call my exes.</p> <p>What I've been doing is using URI encoded strings instead, and I'm using the QT library to do the hard stuff of handling Unicode Strings. But I can't get QT's QFile to find anything on a Unicode path.</p> <p>I start with a string like this:</p> <p>C:\temp\私\Power Up!.mp3</p> <p>I encode it into this:</p> <p>C%3A%5Ctemp%5C%E7%A7%81%5CPower%20Up!.mp3</p> <p>Then I pass it as a command line argument. Right now I'm passing it in the Visual C++ 2010 Express Edition compiler's Debugging Command Line Arguments.</p> <p>Finally I try to do this:</p> <pre><code>std::string fileName( "c:\\temp\\debug " ); std::string extension (".txt"); ofstream a_file ( fileName + extension ); QString filepath ( argv[argc - 1] ); QString url = QUrl::fromPercentEncoding( filepath.toUtf8() ).replace("\\","/"); a_file &lt;&lt; "Param: " &lt;&lt; url.replace("\\","/").toStdString() &lt;&lt; "\n\n"; QFile myQfile ( url.replace("\\","/") ); // Replacing every backslash with a forward slash // QT doesn't allow backslashes in paths. if( !myQfile.exists() ){ a_file &lt;&lt; "The param \"" &lt;&lt; myQfile.fileName().toStdString() &lt;&lt; "\" is not a file."; a_file.close(); exit(1); }//END IF </code></pre> <p>If I don't have a path with a '私' character it works fine, but otherwise the call to exists() returns false and I end up exiting out. I know the file is there though, and when I check my debug file in notepad++ it has the right characters. </p> <p>Can anyone see what I'm doing wrong? </p> <p>Edit: </p> <p>I think I may have got it.</p> <p>First I switched to a wmain like so:</p> <pre><code>int wmain(int argc, wchar_t *argv[]) </code></pre> <p>Then I set up my QStrings like so:</p> <pre><code>QString filepath = QString::fromWCharArray ( argv[argc - 1] ); QString url = QUrl::fromPercentEncoding( filepath.toLocal8Bit() ); TagLib::FileRef f( url.toStdWString().c_str() ); </code></pre> <p>This works so far. I need to do some more testing :), and I'm 90% sure this won't compile in Linux/OSX (I need to build QT in Linux to find out, and look into the wchar_t macro).</p>
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    1. USJeremy Daniel Gregorio
    1. USJeremy Daniel Gregorio
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    1. CO"QT doesn't allow backslashes in paths" - that's wrong, Qt allows both `/` and `\`. As '/' works on all platforms, it's recommended though.
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      1. POQFile Unicode path - file does not exist
      1. USFrank Osterfeld
    2. COSorry, should Have specified I'm on QT 4.8. That said, the docs I found here: http://qt-project.org/doc/qt-4.8/qfile.html had the line "QFile expects the file separator to be '/' regardless of operating system"... I've tried it without the replace though and I still can't get it to work :(
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      1. POQFile Unicode path - file does not exist
      1. USJeremy Daniel Gregorio
    3. COAre url and filepath correct?
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      1. POQFile Unicode path - file does not exist
      1. USFrank Osterfeld
 

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