how can i copy a directary using QDir

[monaem]

hi,
i want to create a directory and copy the content of another directory on it,how can i do?

another question :
this copy contains an executing file ,and i want to launch this execution using a qpushButton in a form, any answer ?


regards.

[guilugi]

Hello,

With QDir, you have the method mkpath to creat a full path (including parent directories that don't exist yet), really useful.

Then to copy a file, you should use QFile::copy(QString sourceFile, QString outputFile)...

There is no copy function in QDir, so you have to do a simple loop to copy a whole directory...by doing this, you can also connect a progressbar to monitor the copy process !

Guilugi.

[guilugi]

Ooops,

For your second question, it's also really simple.

You connect your push button to a dedicated slot, that will start a QProcess linked to your executable, with all the arguments you want !
Just check the docs

Guilugi.

[monaem]

but this directory contains other directories,how can i do?

[yogeshm02]

but this directory contains other directories,how can i do?

I have given below a trimmed down version which I used in an app. You still need to do some work.

.
#include <dirent.h>
#include <sys/stat.h>
 
void copy(QString dir){
    DIR * d = opendir(QFile::encodeName(dir));
    dirent *ent;
    if(d == NULL)//Non-readble
        return;
    //code for copying dir goes here ---------------------------- 1 ------------------------------
    .
    .
    while((ent = readdir(d))){
        QByteArray entry = ent->d_name;
        if( entry == "." || entry == ".." )
            continue;
        entry.prepend( QFile::encodeName( dir.endsWith( "/" ) ? dir : dir + "/" ) );
        if(stat(entry, &statBuf) == 0){
            if(S_ISREG(statBuf.st_mode)){
                QString file_name_with_path = QString::fromLocal8Bit(entry);
               //code for copying file goes here
            }
            if(S_ISDIR(statBuf.st_mode)){
                QString dir_name_with_path = QString::fromLocal8Bit(entry);
                //code for copying dir goes here    ---------- same as 1-----------------------
                .
                .
                copy(dir_name_with_path);
            }
        }
    }
    closedir( d );
}

.
#include <dirent.h>
#include <sys/stat.h>

void copy(QString dir){
    DIR * d = opendir(QFile::encodeName(dir));
    dirent *ent;
    if(d == NULL)//Non-readble
        return;
    //code for copying dir goes here ---------------------------- 1 ------------------------------
    .
    .
    while((ent = readdir(d))){
        QByteArray entry = ent->d_name;
        if( entry == "." || entry == ".." )
            continue;
        entry.prepend( QFile::encodeName( dir.endsWith( "/" ) ? dir : dir + "/" ) );
        if(stat(entry, &statBuf) == 0){
            if(S_ISREG(statBuf.st_mode)){
                QString file_name_with_path = QString::fromLocal8Bit(entry);
               //code for copying file goes here
            }
            if(S_ISDIR(statBuf.st_mode)){
                QString dir_name_with_path = QString::fromLocal8Bit(entry);
                //code for copying dir goes here    ---------- same as 1-----------------------
                .
                .
                copy(dir_name_with_path);
            }
        }
    }
    closedir( d );
}

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[wysota]

Ok, this doesn't look very "Qt-ish". How about:

bool copyDir(const QString &src, const QString &dest){
  QDir dir(src);
  QDir dirdest(dest);
  if(!dir.isReadable()) return false;
  QFileInfoList entries = dir.entryInfoList();
  for(QList<QFileInfo>::iterator it = entries.begin(); it!=entries.end();++it){
    QFileInfo &finfo = *it;
    if(finfo.fileName()=="." || finfo.fileName()=="..") continue;
    if(finfo.isDir()){ copyDir(finfo.filePath()); continue; }
    if(finfo.isSymLink()) { /* do something here */ continue; }
    if(finfo.isFile() && file.isReadable()){
      QFile file(finfo.filePath());
      file.copy(dirdest.absoluteFilePath(finfo.fileName()));
    } else return false;
  }
  return true;
}

bool copyDir(const QString &src, const QString &dest){
  QDir dir(src);
  QDir dirdest(dest);
  if(!dir.isReadable()) return false;
  QFileInfoList entries = dir.entryInfoList();
  for(QList<QFileInfo>::iterator it = entries.begin(); it!=entries.end();++it){
    QFileInfo &finfo = *it;
    if(finfo.fileName()=="." || finfo.fileName()=="..") continue;
    if(finfo.isDir()){ copyDir(finfo.filePath()); continue; }
    if(finfo.isSymLink()) { /* do something here */ continue; }
    if(finfo.isFile() && file.isReadable()){
      QFile file(finfo.filePath());
      file.copy(dirdest.absoluteFilePath(finfo.fileName()));
    } else return false;
  }
  return true;
}

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I didn't compile/test it, so it may not work, but shows the right direction.