QClipboard setText not working

[ChiBriTri]

I can’t seem to figure out how to get QClipboard to work right. clear and setText seem to do nothing. Am I missing something here? win7 with qt 5.3.1. Thanks in advance!

auto *pClip=QApplication::clipboard();
pClip->clear();//no effect?
pClip->setText("abc");//no effect?
QString str=pClip->text()//returns whatever was in clipboard prior to above code

auto *pClip=QApplication::clipboard();
pClip->clear();//no effect?
pClip->setText("abc");//no effect?
QString str=pClip->text()//returns whatever was in clipboard prior to above code

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