Save File in another Folder

Hi Guys,

I have a file which I want to save.
With: fstream File (fileName, ios::out | ios::trunc | ios::binary);
I can save the file in the directory in which my Programm runs.
But I want to save it in a subfolder called "log"
This subfolder should be in the same directory in which my program runs,

I thought its not that hard, I tried to change the name of my file to "/log/filename"
But I simply cant, I dont know how to change my char* to this.

I hope you understood where my problem lies and can help me. thank you :)

Use std::string for string manipulation.

God I knew I had to do this...
Ok, Thanks

Ok, I found out that you cant create directories with iostream.
I found the class QDir, but I dont know how to create a directory...
I tried it with:

Code:

---

QDir* Dir = new QDir("logs");
	if (!Dir->exists())
	{
		Dir->mkdir("../logs/");
	}

---

And with Dir->mkdir("logs"); , ... and so on. But a directory was never created.
How to do this???
The directory should be created in the same directory where my applications runs.

Quote:

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Originally Posted by GonzoFist

The directory should be created in the same directory where my applications runs.

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Then why are you using '..' ? Just use a relative path, or better, get the application path on startup and create an absolute dir specification.

How can I get the relative path or the absolute directory?
Usually I understand the QT Documentation, but with QDir I got some problems in understanding.

Absolute path is one starting with the root of the filesystem ("/"), relative is everything else. So if you are currently in "/a/b/c" and ask for the directory "d" then "d" is a relative path and "/a/b/c/d" is an absolute path both pointing to the same resource.

I have already read the differnce between absolut and relative. (And I think I understood the difference, its not that complicated)
But I dont know how to work with them.
For Example, why doesnt work my Code below?

Code:

---

QDir* Dir = new QDir("logs");
	QString test = Dir->absoluteFilePath("t"); 
	if (!Dir->exists())
	{ 	
		Dir->mkdir(test);
	}

---

With the command absoluteFilePath("t") I get the absolute path where my directory should be.
But my Directory still isnt created.

Your code is invalid. Call QDir::mkdir() with "t" and not the value of test. And don't create QDir objects on the heap, it's not java.

Code:

---

QDir Dir("logs");
	if (!Dir.exists())
	{ 	
		Dir.mkdir("t");
	}

---

Still doesnt work?! I begin hardly feeling stupid...

What does Dir.absolutePath() return?

By the way, your code still doesn't make much sense - it says "if in the current directory there is no 'logs' subdirectory, create a 't' subdirectory". Is that really what you want?

Yeah I know the code doesnt make much sense, but I tried at least to create a Directory. In my finished programm it will create a sub folder called "logs".

With Dir.absolutePath() I get: /home/marco/workspace/IPA/build/logs/t

But in Build there is no folder called "logs" or "t".
Maybe I need root rights or something like that?
I could also post my whole programm but its large :S

I'm not sure how would you want to create a subdirectory of a directory that doesn't exist...

Code:

---

#include <QDir>
#include <QtDebug>
 
int main(){
  QDir dir("logs");
  qDebug() << "Dir:" << dir.absolutePath();
  qDebug() << "Exists:" << dir.exists();
  if(!dir.exists()){
    // if dir doesn't exist, you can't create a subdirectory in it
    // [1]
    dir = QDir::current();
    qDebug() << "Current dir:" << dir.absolutePath();
    if(dir.exists()){
      qDebug() << "Current dir exits...";
      dir.mkdir("logs");
    }
    // [2]
    // dir.mkpath("logs");
  }
  QDir dircheck("logs");
  qDebug() << "Exists:" << dircheck.exists();
  return 0;
}

---

Use either [1] or [2].

Ah yes of course, I cant create a subdirectory in a not existing folder!
I changed my Code to

Code:

---

QDir dir("logs");
	if(!dir.exists())
	{
		dir = QDir::current();
		dir.mkdir("logs");
	}

---

And now it works just as I wanted it to.
Thanks wysota, your the man!

This would be simpler:

Code:

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QDir::current().mkpath("logs");

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