how to change background of mainwindow with image

[babu198649]

hi
i have tried changing background color using style sheets and it works

this->setStyleSheet("background-color:red");

this->setStyleSheet("background-color:red");

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if i try to change background image it does not work

this->setStyleSheet("background-image: url(:/icon/wave.png)");//does not work

this->setStyleSheet("background-image: url(:/icon/wave.png)");//does not work

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or

this->setStyleSheet("QWidget{background-image: url(:/icon/wave.png)}");//does not work

this->setStyleSheet("QWidget{background-image: url(:/icon/wave.png)}");//does not work

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