problem in function call

[saber]

i am not able to call a function .

this is the function.

QString CommandUtil::readStringFromFile(const QString &path, const QIODevice::OpenMode &mode)
{
    QSharedPointer<QFile> file(new QFile(path));

    QString data;

    if(file->open(mode)) {

      data = file->readAll();

      file->close();
    }

    return data;
}

i called that function

quint64 NetworkInfo::getTXbytes() const
{
    quint64 tx = CommandUtil::readStringFromFile(txPath)
            .trimmed()
            .toLong();

    return tx;
}

got this error

/home/shaber/Desktop/Folder/work/corebox/dashboard/lib/network_info.cpp:39: error: no matching function for call to ‘CommandUtil::readStringFromFile(const QString&)’
     quint64 tx = CommandUtil::readStringFromFile(txPath)
                                                        ^

what i am doing wrong??

[Taz742]

@saber
Because function must get 2 parameters, but you send 1.
If you don't want to send parameter, you can add a default OpenMode only in your .h file.

For example

static QString CommandUtil::readStringFromFile(const QString &path, const QIODevice::OpenMode &mode = QIODevice::ReadOnly);

or other open mode from http://doc.qt.io/qt-5/qiodevice.html#OpenModeFlag-enum, or just send a parameter.

static QString CommandUtil::readStringFromFile(const QString &path, const QIODevice::OpenMode &mode = QIODevice::ReadOnly);

Are you interested what does it mean?
If you call this function without mode parameter:

CommandUtil::readStringFromFile("fileAddress.txt"); //by default mode = QIODevice::ReadOnly;

If you call this function with mode parameter:

CommandUtil::readStringFromFile("fileAddress.txt", QIODevice::WriteOnly); //now mode = QIODevice::WriteOnly;

[mrjj]

As @Taz742 says
the function is
commandUtil::readStringFromFile(const QString &path, const QIODevice::OpenMode &mode)

but you call it without the mode params.

[saber]

@Taz742 @mrjj i have no problem with that .
i moved the "readStringFromFile " function from "FileUtil" to "CommandUtil" .
when i called the function from "CommandUtil" , it shows that error .

[Taz742]

@saber Can you post CommandUtil .h file?

[saber]

@Taz742

command_util.h

#ifndef COMMAND_UTIL_H
#define COMMAND_UTIL_H

#include "stacer-core_global.h"

#include <QStringList>
#include <QFile>
#include <QDir>
#include <QTextStream>
#include <QDirIterator>
#include <QStandardPaths>
#include <QSharedPointer>

class STACERCORESHARED_EXPORT CommandUtil
{

public:
    static QString sudoExec(const QString &cmd, QStringList args = QStringList());
    static QString exec(const QString &cmd, QStringList args = QStringList());
    static bool isExecutable(const QString &cmd);

    static QString readStringFromFile(const QString &path, const QIODevice::OpenMode &mode);
    static QStringList readListFromFile(const QString &path, const QIODevice::OpenMode &mode);
private:
    CommandUtil();

};

#endif // COMMAND_UTIL_H

[Taz742]

@saber
Did you read my answer ?

@saber said in problem in function call:

static QString readStringFromFile(const QString &path, const QIODevice::OpenMode &mode);
static QStringList readListFromFile(const QString &path, const QIODevice::OpenMode &mode);

change const QIODevice::OpenMode &mode to const QIODevice::OpenMode &mode = QIODevice::ReadOnly