Quote Originally Posted by monaem
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.
Qt Code: 
  1. .
  2. #include <dirent.h>
  3. #include <sys/stat.h>
  4.  
  5. void copy(QString dir){
  6.     DIR * d = opendir(QFile::encodeName(dir));
  7.     dirent *ent;
  8.     if(d == NULL)//Non-readble
  9.         return;
  10.     //code for copying dir goes here ---------------------------- 1 ------------------------------
  11.     .
  12.     .
  13.     while((ent = readdir(d))){
  14.         QByteArray entry = ent->d_name;
  15.         if( entry == "." || entry == ".." )
  16.             continue;
  17.         entry.prepend( QFile::encodeName( dir.endsWith( "/" ) ? dir : dir + "/" ) );
  18.         if(stat(entry, &statBuf) == 0){
  19.             if(S_ISREG(statBuf.st_mode)){
  20.                 QString file_name_with_path = QString::fromLocal8Bit(entry);
  21.                //code for copying file goes here
  22.             }
  23.             if(S_ISDIR(statBuf.st_mode)){
  24.                 QString dir_name_with_path = QString::fromLocal8Bit(entry);
  25.                 //code for copying dir goes here    ---------- same as 1-----------------------
  26.                 .
  27.                 .
  28.                 copy(dir_name_with_path);
  29.             }
  30.         }
  31.     }
  32.     closedir( d );
  33. }
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