src_corelib_io_qdir.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
 
void wrapInFunction()
{
 
QDir("/home/user/Documents")
QDir("C:/Users")
 
 
 
QDir("images/landscape.png")
 
 
 
QDir("Documents/Letters/Applications").dirName() // "Applications"
QDir().dirName()                                 // "."
 
 
QDir directory("Documents/Letters");
QString path = directory.filePath("contents.txt");
QString absolutePath = directory.absoluteFilePath("contents.txt");
 
 
QDir dir("example");
if (!dir.exists())
    qWarning("Cannot find the example directory");
 
 
QDir dir = QDir::root();                 // "/"
if (!dir.cd("tmp")) {                    // "/tmp"
    qWarning("Cannot find the \"/tmp\" directory");
} else {
    QFile file(dir.filePath("ex1.txt")); // "/tmp/ex1.txt"
    if (!file.open(QIODevice::ReadWrite))
        qWarning("Cannot create the file %s", file.name());
}
 
 
QString bin = "/local/bin";         // where /local/bin is a symlink to /usr/bin
QDir binDir(bin);
QString canonicalBin = binDir.canonicalPath();
// canonicalBin now equals "/usr/bin"
 
QString ls = "/local/bin/ls";       // where ls is the executable "ls"
QDir lsDir(ls);
QString canonicalLs = lsDir.canonicalPath();
// canonicalLS now equals "/usr/bin/ls".
 
 
QDir dir("/home/bob");
QString s;
 
s = dir.relativeFilePath("images/file.jpg");     // s is "images/file.jpg"
s = dir.relativeFilePath("/home/mary/file.txt"); // s is "../mary/file.txt"
 
 
QDir::setSearchPaths("icons", QStringList(QDir::homePath() + "/images"));
QDir::setSearchPaths("docs", QStringList(":/embeddedDocuments"));
...
QPixmap pixmap("icons:undo.png"); // will look for undo.png in QDir::homePath() + "/images"
QFile file("docs:design.odf"); // will look in the :/embeddedDocuments resource path
 
 
QDir dir("/tmp/root_link");
dir = dir.canonicalPath();
if (dir.isRoot())
    qWarning("It is a root link");
 
 
// The current directory is "/usr/local"
QDir d1("/usr/local/bin");
QDir d2("bin");
if (d1 == d2)
    qDebug("They're the same");
 
 
// The current directory is "/usr/local"
QDir d1("/usr/local/bin");
d1.setFilter(QDir::Executable);
QDir d2("bin");
if (d1 != d2)
    qDebug("They differ");
 
 
C:/Users/Username
 
 
Q_INIT_RESOURCE(myapp);
 
 
inline void initMyResource() { Q_INIT_RESOURCE(myapp); }
 
namespace MyNamespace
{
    ...
 
    void myFunction()
    {
        initMyResource();
    }
}
 
 
Q_CLEANUP_RESOURCE(myapp);
 
QString absolute = "/local/bin";
QString relative = "local/bin";
QFileInfo absFile(absolute);
QFileInfo relFile(relative);
 
QDir::setCurrent(QDir::rootPath());
// absFile and relFile now point to the same file
 
QDir::setCurrent("/tmp");
// absFile now points to "/local/bin",
// while relFile points to "/tmp/local/bin"
}