How to work with files

[artt]

So what is indxing? If I need to use such attribute as path then I should present all the files (It is something like QSystemModel with List or TreeView?). And I do not understand what to "write file to xml" -- the content or its name., path etc? If in aforementioned tutorial there is xml widget.ui, so I understand that these ones should written as some property with these attributes in one list(file). So I need some input for the name of file system or the selector of disk C,D,F at the beginning.
As the result the simple examples are in books and tutorials but I need to know the concept of the application with the main qt parts. For example you mentioned the Qtdesigner but it does not have no code extractor so what is the sense of it. And another issue -- does Qt have no exception hadling, as it do very complex the applications? For example during the inputing the disk name or file for the search that is so important in java.

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Added after 25 minutes:

So what is indxing? If I need to use such attribute as path then I should present all the files (It is something like QSystemModel with List or TreeView?). And I do not understand what to "write file to xml" -- the content or its name., path etc? If in aforementioned tutorial there is xml widget.ui, so I understand that these ones should written as some property with these attributes in one list(file). So I need some input for the name of file system or the selector of disk C,D,F at the beginning.
As the result the simple examples are in books and tutorials but I need to know the concept of the application with the main qt parts. For example you mentioned the Qtdesigner but it does not have no code extractor so what is the sense of it. And another issue -- does Qt have no exception hadling, as it do very complex the applications? For example during the inputing the disk name or file for the search that is so important in java.