it-swarm.cn

获取Qt应用程序中的当前工作目录

我正在使用Qt库用C++编写程序。我的home bin目录中有一个符号链接到可执行文件。我希望我的程序的当前工作目录是我在终端中的目录(即pwd命令的结果)。我看到了QDir::currentPath()函数,但是它返回了二进制文件所在的目录。

如何找到当前的工作目录?

64
Geoffroy

感谢RedX和Kaz的回答。我不明白为什么我会给出exe的路径。我找到了另一种方法:

QString pwd("");
char * PWD;
PWD = getenv ("PWD");
pwd.append(PWD);
cout << "Working directory : " << pwd << flush;

它不如一条线优雅......但它对我有用。

3
Geoffroy

刚刚测试过,QDir::currentPath()确实返回了我调用可执行文件的路径。

符号链接不“存在”。如果从该路径执行exe,则可以从符号链接指向的路径中有效地执行它。

86
RedX

你试过 QCoreApplication :: applicationDirPath()

qDebug() << "App path : " << qApp->applicationDirPath();
48
KaZ

要添加到KaZ答案,每当我制作QML应用程序时,我倾向于将其添加到主c ++中

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QStandardPaths>

int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);
QQmlApplicationEngine engine;

// get the applications dir path and expose it to QML 

QUrl appPath(QString("%1").arg(app.applicationDirPath()));
engine.rootContext()->setContextProperty("appPath", appPath);


// Get the QStandardPaths home location and expose it to QML 
QUrl userPath;
   const QStringList usersLocation = QStandardPaths::standardLocations(QStandardPaths::HomeLocation);
   if (usersLocation.isEmpty())
       userPath = appPath.resolved(QUrl("/home/"));
   else
      userPath = QString("%1").arg(usersLocation.first());
   engine.rootContext()->setContextProperty("userPath", userPath);

   QUrl imagePath;
      const QStringList picturesLocation = QStandardPaths::standardLocations(QStandardPaths::PicturesLocation);
      if (picturesLocation.isEmpty())
          imagePath = appPath.resolved(QUrl("images"));
      else
          imagePath = QString("%1").arg(picturesLocation.first());
      engine.rootContext()->setContextProperty("imagePath", imagePath);

      QUrl videoPath;
      const QStringList moviesLocation = QStandardPaths::standardLocations(QStandardPaths::MoviesLocation);
      if (moviesLocation.isEmpty())
          videoPath = appPath.resolved(QUrl("./"));
      else
          videoPath = QString("%1").arg(moviesLocation.first());
      engine.rootContext()->setContextProperty("videoPath", videoPath);

      QUrl homePath;
      const QStringList homesLocation = QStandardPaths::standardLocations(QStandardPaths::HomeLocation);
      if (homesLocation.isEmpty())
          homePath = appPath.resolved(QUrl("/"));
      else
          homePath = QString("%1").arg(homesLocation.first());
      engine.rootContext()->setContextProperty("homePath", homePath);

      QUrl desktopPath;
      const QStringList desktopsLocation = QStandardPaths::standardLocations(QStandardPaths::DesktopLocation);
      if (desktopsLocation.isEmpty())
          desktopPath = appPath.resolved(QUrl("/"));
      else
          desktopPath = QString("%1").arg(desktopsLocation.first());
      engine.rootContext()->setContextProperty("desktopPath", desktopPath);

      QUrl docPath;
      const QStringList docsLocation = QStandardPaths::standardLocations(QStandardPaths::DocumentsLocation);
      if (docsLocation.isEmpty())
          docPath = appPath.resolved(QUrl("/"));
      else
          docPath = QString("%1").arg(docsLocation.first());
      engine.rootContext()->setContextProperty("docPath", docPath);


      QUrl tempPath;
      const QStringList tempsLocation = QStandardPaths::standardLocations(QStandardPaths::TempLocation);
      if (tempsLocation.isEmpty())
          tempPath = appPath.resolved(QUrl("/"));
      else
          tempPath = QString("%1").arg(tempsLocation.first());
      engine.rootContext()->setContextProperty("tempPath", tempPath);
engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
return app.exec();
}

在QML中使用它

....
........
............
Text{
text:"This is the applications path: " + appPath
+ "\nThis is the users home directory: " + homePath
+ "\nThis is the Desktop path: " desktopPath;
}
9
joseph

我在Windows下运行Qt 5.5,QDir的默认构造函数似乎拿起当前的工作目录,而不是应用程序目录。

我不确定getenv PWD是否可以跨平台工作,我认为它在Shell启动应用程序时设置为当前工作目录,并且不包括应用程序本身完成的任何工作目录更改(这可能是为什么OP正在看到这种行为)。

所以我想我会添加一些其他的方法来给你当前的工作目录(而不是应用程序的二进制位置):

// using where a relative filename will end up
QFileInfo fi("temp");
cout << fi.absolutePath() << endl;

// explicitly using the relative name of the current working directory
QDir dir(".");
cout << dir.absolutePath() << endl;
3
Mark Walker