如何在Qt 5中读写QResource文件? [英] How to write and read to/from a QResource file in Qt 5?

问题描述

奇怪的是，我通过 Add Existing Files ... 将所需的文件添加到资源中，文件在那里.我运行qmake(构建->运行qmake")以使文件可用. 第一个问题: 我无法从输出终端将任何内容写入文件！ 但是，当我手动写入文件时，输出终端会在每次运行时显示更改它.第二个问题:它仍然显示 QIODevice :: read:设备未打开 ！ 这是我的代码:

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();
}

这是代码的输出端子:

And here's output terminal of the code:

推荐答案

保存在

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

文档:

当前，Qt始终将数据直接存储在可执行文件中，即使在Windows，macOS和iOS上，操作系统也提供对资源的本机支持. ...

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