Save File in another Folder

[GonzoFist]

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?

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

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

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