I got errors with my code...

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ui->label->pixmap(":/new/prefix1/images/solve3.png");

also got errors with this code...

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  char[32] urr = ":/new/prefix1/images/solve3.png";
    ui->label->pixmap(urr);

ERRORS:
/Users/martins/showhide/mainwindow.cpp:31: error: no matching function for call to 'QLabel::pixmap(const char [32])'

/Library/Frameworks/QtGui.framework/Headers/qlabel.h:75: note: candidates are: const QPixmap* QLabel::pixmap() const

What about

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ui->label->setPixmap(QPixmap(":/new/prefix1/images/solve3.png"));

?
Also, having a look at the API documentation isn't a bad idea at all: http://doc.trolltech.com/4.6/qlabel.html