7

I need to receive the absolute file path like

C:/Users/Dima/YandexDisk/_Application/WeldAnalysis/ExperimentDefaults.xlsx

from path of QRC file like

:/Data/ExperimentDefaults.xlsx.

How can I do this?

cbuchart
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Dima Gurov
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    `qrc` is itself a file and a collection of resource files embedded to executable files and no longer mapped to OS file system. Even if you can see file paths in that `qrc` file they supposed to be all compacted in one collective resource file. – Alexander V May 10 '17 at 01:25
  • If the resource file dir. is the one of the application itself then this might help: [`QCoreApplication::applicationDirPath()`](http://doc.qt.io/qt-5/qcoreapplication.html#applicationDirPath) and, even better, its `static`. I found this in [SO: How to find the installation directory of a Qt application?](http://stackoverflow.com/questions/19057482/how-to-find-the-installation-directory-of-a-qt-application). – Scheff's Cat May 10 '17 at 05:39
  • I think you can't because data is compiled into the binary, according to the [Qt resource doc](http://doc.qt.io/qt-5/resources.html) – thibsc May 10 '17 at 08:25

1 Answers1

4

Resources are packed all together into the QRC file, they are not exposed to the filesystem, thus they cannot be converted to a standard path; it is like accessing a file inside a zip file.

What are you willing to do with such file path? QFile can deal with resource paths (":/...") and open such files, but other file handling APIs don't (such as C's fopen or C++'s std::ifstream). Also, and for the same reason, non-Qt application won't be able to open such files if passed as a parameter.

Options you have include:

  • opening the file using QFile and read it using related Qt classes (given you are dealing with an Excel file I think it doesn't worth the effort, unless you have some library to read it from a memory buffer).

  • copying the file out of the resources container to a temporary directory (you can use QTemporaryDir to create one), and use the file from there:

    QTemporaryDir tempDir;
if (tempDir.isValid()) {
  const QString tempFile = tempDir.path() + "/yourfile.xlsx";
  if (QFile::copy(":/yourfile.xlsx", tempFile)) {
    // your file is now extracted to the filesystem
  }
}

Only be aware that when tempDir is destroyed, the temporary directory is also deleted, therefore your file. You can avoid this by disabling the auto-remove feature: tempDir.setAutoRemove(false) and manually deleting the temporary directory when you finish with the extracted file.

cbuchart
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