Qt 5
Unsolved
India
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Hi and welcome to devnet,
Please take the time to read the chapter about creating GUI with Designer, it's all explained there.
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Welcome!
why we use this in ui header in qt?
The short answer is this: The UI files make it easy to automatically generate C++ code for your GUI.
I believe @SGaist is talking about the chapter at http://doc.qt.io/qt-5/designer-using-a-ui-file.html