Qt with yaml-cpp in qrc file

Nan Feng

Hi, I am trying to use Qt and yaml-cpp library to read and write .yaml, if it is an absolute path (C:/test.yaml), everything is normal. If it is a .yaml file in qrc, the program crashes directly and cannot be started. It seems that yaml-cpp cannot recognize the .yaml file in this qrc. Is there any solution?

KroMignon

@Nan-Feng said in Qt with yaml-cpp in qrc file:

It seems that yaml-cpp cannot recognize the .yaml file in this qrc. Is there any solution?

If you want to got help, you have to show the code you are using to read the yaml file from qrc.

Nan Feng

code:

YAML::Node config = YAML::LoadFile(":/assets/test.yaml");

std::string value = config["name"].asstd::string();

YAML::Node config = YAML::LoadFile("C:/test.yaml");

std::string value = config["name"].asstd::string();

With the above wording, the program crashes directly.
In the following way of writing, the value corresponding to the name key can be read normally

KroMignon

@Nan-Feng said in Qt with yaml-cpp in qrc file:

YAML::Node config = YAML::LoadFile(":/assets/test.yaml");

I don't think YAML supports RC files.
You have to read the the yaml file into a QString and then passe it to YAML.

Something like:

QFile file(":/assets/test.yaml");
if(file.open(QFile::ReadOnly | QFile::Text))
{
    QTextStream in(&file);
    QString myText = in.readAll();
    YAML::Node config(myText.toStdString());
}

KH-219Design

I agree with @KroMignon 's approach.

Another alternative (in case it becomes appealing for any other reason) is to use QTemporaryFile:

  // note the ":" at the front of the path
  std::string path_inside_qrc = ":/data/sim_rpc_replies_immediate_scores.pbtxt";
  std::unique_ptr<QTemporaryFile> temporary_file;

  temporary_file.reset(
        QTemporaryFile::createNativeFile(QString::fromStdString(path_inside_qrc))
  );
  std::string file_name = temporary_file->fileName().toUtf8().constData();
  
  // TODO: add code to use the temporary file.
 
  // Delete the temp file after using it
  temporary_file.reset();

(This is "self plagiarism" from this prior discussion thread.)