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POHow to launch the associated application for a file / directory / URL?
 

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  1. POHow to launch the associated application for a file / directory / URL?
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    <p><strong>Linux</strong> seems to be easy: <code>xdg-open &lt;file/directory/URL&gt;</code>. </p> <p>Apparently, <strong>Mac</strong> is similar: <code>open</code> should be used instead of <code>xdg-open</code>. I don't have access to a Mac so I couldn't test it.</p> <p>For <strong>Windows</strong>, I found 4 different suggestions and those that I have tried failed.</p> <ul> <li><p><a href="https://stackoverflow.com/q/1480971/341970">Is there a non-java, cross platform way to launch the associated application for a certain file type?</a> suggests <br/><code>start</code></p></li> <li><p><a href="https://stackoverflow.com/q/2765823/341970">How to give focus to default program of shell-opened file, from Java?</a> suggests <br/> <code>cmd /c start ...</code></p></li> <li><p><a href="https://stackoverflow.com/q/526037/341970">How to open user system preferred editor for given file?</a><br> <a href="https://stackoverflow.com/q/2211209/341970">How to Find Out Default File Opener with Java?</a> suggest <br/> <code>RUNDLL32.exe</code></p></li> <li><p><a href="https://stackoverflow.com/q/11007537/341970">What is the correct way to use ShellExecute() in C to open a .txt</a><br> <a href="https://stackoverflow.com/q/5127249/341970">Open file with Windows&#39; native program within C++ code</a><br> <a href="https://stackoverflow.com/q/10737854/341970">How to use ShellExecute to open html files in Windows using C++?</a> suggest <br/> <code>ShellExecute</code></p></li> </ul> <p>I have tried the first 3 with <code>system()</code> and <code>QProcess::startDetached()</code> and <code>"http://www.stackoverflow.com"</code> as argument but they all failed; <code>start</code> works just fine from the command line though. I haven't tried <code>ShellExecute</code> yet.</p> <p><strong>What is the Windows equivalent of <code>xdg-open</code>?</strong> It seem to me, it is <code>start</code> but why did my attempts with <code>start</code> fail?</p> <p><strong>Is <code>ShellExecute</code> my only option?</strong></p> <hr> <p><strong>EDIT</strong> I thought <code>QDesktopServices::openUrl()</code> was for web pages only because it did not work for files or directories.</p> <p>After some debugging I figured out that if I replace <code>\\</code> with <code>/</code> in the path on Windows, it works for files but the directories are still not opened. Any ideas what I am doing wrong?</p> <pre><code>QDir dir("C:/Documents and Settings/ali"); qDebug() &lt;&lt; "Exists? " &lt;&lt; dir.exists(); qDebug() &lt;&lt; dir.absolutePath(); QDesktopServices::openUrl(QUrl(dir.absolutePath())); qDebug() &lt;&lt; "External app called"; </code></pre> <p>Application Output:</p> <pre class="lang-none prettyprint-override"><code>Exists? true "C:/Documents and Settings/ali" External app called </code></pre> <p>But nothing happens, the directory is not opened. On Linux, directories are opened with the default file manager as expected.</p> <hr> <p><strong>SOLUTION:</strong> Due to the Qt bug <em>and</em> Windows quirks (malformed application window), I ended up using <code>ShellExecute</code>. That gives me enough flexibility to achieve exactly what I want at some expense...</p>
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    1. COIf you want to do it via system() you would have to invoke `cmd /c start whatever` and perhaps need to specify the full path to cmd.exe. I think ShellExecute() is there more elegant solution, though.
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