Save File in another Folder

[GonzoFist]

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:

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

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

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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.