CODEWITHSUNDEEP
c++qtqt5qfileqresource
Armin
Armin

Reputation: 135

How to write and read to/from a QResource file in Qt 5?

It's strange, I add desired file into the resources via Add Existing Files..., the file is there. I run qmake ("Build->Run qmake") to make the file available. The first issue: I can't write anything into the file from output terminal! But when I manually write into the file, the output terminal shows the change every time I run it. Second issue: it still says QIODevice::read: device not open ! Here's my code:

#include <QCoreApplication>
#include <QDebug>
#include <QFile>
#include <QString>
#include <QTextStream>
#include <iostream>

void wFile(QString Filename)
{ 
  QFile  nFile(Filename);
  QTextStream str(&nFile);
  qDebug() << "what do you want to write in the desired file: ";
  str.readLine();
  if (!nFile.open(QFile::WriteOnly  | QFile::Text))
  {
    qDebug() << "could not open the file";
    return;
  }
  nFile.flush(); 
  nFile.close();
 }

void read (QString Filename){
  QFile nFile(Filename);

  if(!nFile.open(QFile::ReadOnly | QFile::Text))
  {
    qDebug() << "could not open file for reading";
    return;
  }
  QTextStream in(&nFile);
  QString nText = in.readAll();

  qDebug() << nText;
  nFile.close();
 }


int main(int argc, char *argv[])
{
 QCoreApplication a(argc, argv);
 QString nFilename =":/MyFiles/DocumentArminV.txt";

 wFile(nFilename);
 read(nFilename);

 return a.exec();
}

And here's output terminal of the code: out put

Upvotes: 1

Views: 1452

Answers (1)

eyllanesc
eyllanesc

Reputation: 243887

The files saved in a qresource are read-only since they are part of the executable so you can not write or modify them.

docs:

enter image description here

Currently, Qt always stores the data directly in the executable, even on Windows, macOS, and iOS, where the operating system provides native support for resources. ...

Upvotes: 5

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