How to erase all the files and folders in the Selected existing directory

[merry]

Hi all

Working on Qt4.2

Problem :

I want to delete all the flles and folders contained in the directory that is selected by QFileDialog.

Pls help , if anyboby know.......


Thanx

[marcel]

QDir dir = ...//initialize with the return of the file dlg
void recursiveDelete(const QDir &dir ) 
{
  QList<QFileInfo> infLst = dir.entryInfoList();
  foreach(QFileInfo finfo, infList )
  {
     if(fInfo.isDir() ) 
    {
      QDir subDir(finfo.absolutePath());
      recursiveDelete(subDir);
      dir.rmdir(subDir);
    }
    else { //file
    dir.remove(finfo.absolutePath());
   }
  }
}

QDir dir = ...//initialize with the return of the file dlg
void recursiveDelete(const QDir &dir ) 
{
  QList<QFileInfo> infLst = dir.entryInfoList();
  foreach(QFileInfo finfo, infList )
  {
     if(fInfo.isDir() ) 
    {
      QDir subDir(finfo.absolutePath());
      recursiveDelete(subDir);
      dir.rmdir(subDir);
    }
    else { //file
    dir.remove(finfo.absolutePath());
   }
  }
}

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This code is not tested so you may have to polish it a bit .

But the idea is correct.

Regards

[spud]

You should specify QDir::NoDotAndDotDot. I.e.

QList<QFileInfo> infLst = dir.entryInfoList(QDir::NoDotAndDotDot);

QList<QFileInfo> infLst = dir.entryInfoList(QDir::NoDotAndDotDot);

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you should also be very careful with this function. Otherwise you'll get into trouble faster than you can say

recursiveDelete(QDir("/"))

recursiveDelete(QDir("/"))

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[marcel]

You should specify QDir::NoDotAndDotDot. I.e.

QList<QFileInfo> infLst = dir.entryInfoList(QDir::NoDotAndDotDot);

QList<QFileInfo> infLst = dir.entryInfoList(QDir::NoDotAndDotDot);

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you should also be very careful with this function. Otherwise you'll get into trouble faster than you can say

recursiveDelete(QDir("/"))

recursiveDelete(QDir("/"))

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I already said this code is not tested.
It is not meant just to be copy-pasted in an application.
It is just a draft.

So, whoever decides to use it should adapt it to their own needs.

Regards

[merry]

Thanx

It works , It deletes all the files contained in the folder,

but is there any other way , that after deleting all the files of the folder it also deletes that folder .


Thanx

[marcel]

Yes, just call rmdir for the original QDir, that you pass to the funciton.
You have to call this after the function returns.

Regards

[merry]

Thanx

I do like this only ,but it wont works...

Pls view code...

void Form1::DeleteData(QString dirViewPath)
{
     QDir dirPath(dirViewPath);
	 QList<QFileInfo> infLst = dirPath.entryInfoList();
     for(int i=0;i<infLst.size();i++)
    {
	   QFileInfo strFileInfo = infLst.at(i);
	   QString strFileName = strFileInfo.fileName();
	     if(!(strFileInfo.fileName() == "." || strFileInfo.fileName() == ".."))
		{
	     if(strFileInfo.isDir())
	      {
		   QString strFilePath = dirViewPath + "/" + strFileInfo.fileName();
		   QString fileName = strFileInfo.fileName();
		   DeleteData(strFilePath);
		   dirPath.rmdir(dirViewPath);
		  }
		  else
	     {
	       QString fileName = dirViewPath + "/" + strFileInfo.fileName();
              QFile file1(fileName);
	       file1.remove();
		 }
	  } 
   }
 }

void Form1::DeleteData(QString dirViewPath)
{
     QDir dirPath(dirViewPath);
	 QList<QFileInfo> infLst = dirPath.entryInfoList();
     for(int i=0;i<infLst.size();i++)
    {
	   QFileInfo strFileInfo = infLst.at(i);
	   QString strFileName = strFileInfo.fileName();
	     if(!(strFileInfo.fileName() == "." || strFileInfo.fileName() == ".."))
		{
	     if(strFileInfo.isDir())
	      {
		   QString strFilePath = dirViewPath + "/" + strFileInfo.fileName();
		   QString fileName = strFileInfo.fileName();
		   DeleteData(strFilePath);
		   dirPath.rmdir(dirViewPath);
		  }
		  else
	     {
	       QString fileName = dirViewPath + "/" + strFileInfo.fileName();
              QFile file1(fileName);
	       file1.remove();
		 }
	  } 
   }
 }

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[marcel]

DeleteData does not work?
Or removing the parent dir?
I assume you call it like this:

...
QString dirViewPath = ...
DeleteData(dirViewPath);
//Also add the following two lines:
QDir dir(dirViewPath);
dir.rmdir();
...

...
QString dirViewPath = ...
DeleteData(dirViewPath);
//Also add the following two lines:
QDir dir(dirViewPath);
dir.rmdir();
...

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Or is it a slot?

Regards

[merry]

HI

DeleteData does not work?
Or removing the parent dir?
I assume you call it like this:
...
QString dirViewPath = ...
DeleteData(dirViewPath);
//Also add the following two lines:
QDir dir(dirViewPath);
dir.rmdir();

Pls view the code I sent you in the last post,I think I had added the above two lines..

thanx

[marcel]

Oh, yes, I see now.
That will not work because at that point the parent dir is possible not to be empty, therefore the call will fail.

Do it like I have shown you.

Another solution is:

void Form1::DeleteData(String dirViewPath) 
{
 ...
 //function body
 ...
 
 if(!dirPath.count()==2) //"." and ".." -- might not be  the case. if not,. test with 0 
 {
   dirPath.cdUp();
   dirPath.rmdir(dirViewPath);
 }
}

void Form1::DeleteData(String dirViewPath) 
{
 ...
 //function body
 ...
 
 if(!dirPath.count()==2) //"." and ".." -- might not be  the case. if not,. test with 0 
 {
   dirPath.cdUp();
   dirPath.rmdir(dirViewPath);
 }
}

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This will work. I forgot to mention that you have to go one level above dirViewPath, in order to delete it.

Regards

[merry]

Thanx for the reply

can u pls explain me why u had used this line

if(!dirPath.count()==2)

if(!dirPath.count()==2)

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and also I had used this also

if(!dirPath.count()==2) //"." and ".." -- might not be  the case. if not,. test with 0 
 {
   dirPath.cdUp();
   dirPath.rmdir(dirViewPath);
 }

if(!dirPath.count()==2) //"." and ".." -- might not be  the case. if not,. test with 0 
 {
   dirPath.cdUp();
   dirPath.rmdir(dirViewPath);
 }

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but it also not works....

[marcel]

I am at work and I write these in a hurry.
Remove the "!".
I added those because count might return 2 even if the dir is empty( 2 for . and .. ).

Regards

[merry]

Thanx Marcel

But it also not works

[marcel]

This means that "." and ".." are ignore by count().
Compare with 0 instead of 2 and you'll get it done.

Regards

[merry]

Sorry

It again not works

regards

[marcel]

Then just delete it outside the function after the directory's contents are all removed.
I think you don't "believe in urself" .

Regards

[merry]

Thank You very much for telling me that

I dont beleive in myself

[merry]

hi

Is there anybody Who tells me how to delete folders after the deletion of files..

Actually all the files contained in the folders are deleted but only the blank folders are left

how can i delete folders , pls help....

I used this also but nothing happens

if(dirPath.count()==0)
 {
   dirPath.cdUp();
   dirPath.rmdir(dirViewPath);
 }

if(dirPath.count()==0)
 {
   dirPath.cdUp();
   dirPath.rmdir(dirViewPath);
 }

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Thanx

[marcel]

Do it "urself"!


Regards

[merry]

Thanx Marcel for the reply

Ok I 'll do it myself only.