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#include <QtGui>
// --------------------------------
int main(int argc, char** argv)
{
    QApplication app(argc, argv);
    QWidget      wgt;

    QWidget* pwgt2 = new QWidget(&wgt);
    QPalette pal2;
    pal2.setBrush(pwgt2->backgroundRole(), QBrush(QPixmap("stone.jpg")));
    pwgt2->setPalette(pal2);
    pwgt2->resize(100, 100);
    pwgt2->move(75, 75);
    pwgt2->setAutoFillBackground(true);

    wgt.resize(200, 200);
    wgt.show();

    return app.exec();
}

 QPalette* pal2 = new QPalette();
   pal2->setBrush(pwgt2->backgroundRole(), QBrush(QPixmap("stone.jpg")));

#include <QtGui/QApplication>
#include <QtGui>

int main(int argc, char** argv)
{
    QApplication app(argc, argv);
    QPixmap pixmap;

    qDebug() << "By relative path. Is load: " << pixmap.load("myFile.jpg");
    qDebug() << "By absolute path. Is load: " << pixmap.load("C:\\MyDir\\myFile.jpg");

    return app.exec();
}

QApplication::applicationDirPath () 

    qDebug() << "Dir of EXE:" << QApplication::applicationDirPath();  // Без палки
    qDebug() << "Path of EXE:" << QApplication::applicationFilePath();  // Полное имя exe
    char b[200];
    getcwd(b, 198);
    qDebug() << "Current Dir (getcwd):" << b;

Запускается H:\QtExamp\chapter05\ScrollArea\ScrollArea.exe...
Dir of EXE: "H:/QtExamp/chapter05/ScrollArea" 
Path of EXE: "H:/QtExamp/chapter05/ScrollArea/ScrollArea.exe" 
Current Dir (getcwd): H:\QtExamp\chapter05\ScrollArea\release 

C:\Windows\system32>cd C://Qt

C:\Qt>cd ..

C:\>cd C:/Qt

C:\Qt>_