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Filepath in IOS

  • I asked already in a [SOLVED] Post:
    Which was obviously not very intelligent. You can answer there or also here. Thx.

  • Lifetime Qt Champion

    SGaist already answered your question in the previous post

  • I saw it, but it didn't work.

  • Is there any other place in IOS where I can create a file with QFile? A path that every device has, like on android the /sdcard/appname path for example?

  • @Marco-Polo On iOS it is intended that you create your output or bundle input files in the Documents folder of your app bundle. To provide platform-independent output, you will need to explicitly check the platform before attempting to create your file. For example, this is something that we use:

      QString log_dir = "../output/";
    #ifdef Q_OS_IOS
      log_dir = QStandardPaths::writableLocation(
                                        QStandardPaths::DocumentsLocation) + '/';
      std::string log_filename(log_dir.toLocal8Bit().data());
      log_filename += "TAPDisplay_Log_" + unique_tag + ".txt";

    This covers us for Windows/Linux and iOS. You'll probably have similar restrictions on the Android as to where you can write data.

  • Ok, I could solve it on my IPod touch (IOS 6.1.6), everything worked, so I loaded it up on the App Store. On an IPhone (IOS 7) of my colleague it didn't work. I had used another approach => I used the macro Q_INIT_RESOURCE in my main.cpp and the path with QStandardPahts::...
    Now I don't know how exactly to use your approach because I tried and it didn't work.

  • @Marco-Polo I am not sure what problems you are having. We have built our software for iOS 7 through 9.1 on iPad and iPhone without a problem. It seems if you are having to use Q_INIT_RESOURCE suggests you are trying to do something a bit differently than we are. I don't see how working with a filepath should have a tie-in to the Qt resource system.

    The code snippet I posted constructs the proper path and file name to set the path to the Documents folder in the app bundle. Perhaps if you could post a code snippet of what you're trying, I could give you more help

  • Ok my main.cpp looks as follows:
    #include "dialog.h"
    #include <QApplication>

    int main(int argc, char *argv[])
    QApplication a(argc, argv);

    Dialog w;;
    return a.exec();

    the filepath part:
    Dialog::Dialog(QWidget *parent) :
    ui(new Ui::Dialog)

    QString log_dir = "../output/";
    #ifdef Q_OS_IOS
      log_dir = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation) + '/';
      std::string log_filename(log_dir.toLocal8Bit().data());
      log_filename += "TAPDisplay_Log_Data.txt";
    bild = new QImage(this->width(), this->height(), QImage::Format_RGB32);

    this load() function:
    void Dialog::load()
    if (! | QIODevice::Text))
    QDataStream in(&file);
    in >> map;file.close();
    and the save function is similar.

    I hope this is useful.

  • Could it also work with QDir::absolutePath, because on android this worked. Maybe I could add something, so it would work.

  • @Marco-Polo I am sorry for the delay. I did not see that you replied. Please include my name (by hitting reply), so I can get notified of your response.

    What I am seeing in your code is that you are calling ::setFileName() with "log_dir".


    This does not contain the actual file name. In the code, I set the log_dir to the path to the writable documents location, then append the actual target filename to the path. That is what should be passed to the QFile. I am not sure how it works on any iOS device as written. Shouldn't it be:


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