Filepath in IOS

jsulm

SGaist already answered your question in the previous post

Marco Polo

I saw it, but it didn't work.

Marco Polo

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?

kolegs

check this out http://forum.qt.io/topic/45601/solved-ios-8beta-qt-5-3-1-problem-with-writing-data-to-file/2

DRoscoe

@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) + '/';
#endif
  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.

Marco Polo

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.

DRoscoe

@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

Marco Polo

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

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

Dialog w;
w.show();

return a.exec();

}
@
the filepath part:
@
Dialog::Dialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::Dialog)
{
ui->setupUi(this);
this->showFullScreen();
//file.setFileName(dir.absolutePath()+"Database.txt");
//file.setFileName(QStandardPaths::writableLocation(QStandardPaths::DataLocation)+"Datab.txt");
//file.setFileName("Database.txt");

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

  log_filename += "TAPDisplay_Log_Data.txt";

  file.setFileName(log_dir);

bild = new QImage(this->width(), this->height(), QImage::Format_RGB32);

load();

@
this load() function:
@
void Dialog::load()
{
if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
{return;}
QDataStream in(&file);
in.setVersion(QDataStream::Qt_5_4);
in >> map;file.close();
}
@
and the save function is similar.

I hope this is useful.

Marco Polo

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

DRoscoe

@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".

file.setFileName(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:

file.setFileName(log_filename);