resizing based om the system screen resolutions

[ramesh08]

HI ALL,
Iam newbie to this Qt5 ,HERE i want to resize my gui based on system resolutions. and my application screen is like 768x1024 size for 1920 x 1080 system resolution. iam using the resize as

QScreen *screen = QGuiApplication::primaryScreen();
if (screen) {
      QRect screenGeometry = screen->geometry();
      int screenWidth = screenGeometry.width();
      int screenHeight = screenGeometry.height();
      this->resize(screenWidth, screenHeight);
}

QScreen *screen = QGuiApplication::primaryScreen();
if (screen) {
      QRect screenGeometry = screen->geometry();
      int screenWidth = screenGeometry.width();
      int screenHeight = screenGeometry.height();
      this->resize(screenWidth, screenHeight);
}

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Screen Size: 800 x 600
Window Size: 800 x 600

Screen Size: 1920 x 1080
Window Size: 1920 x 1080

Screen Size: 1680 x 1050
Window Size: 1680 x 1050

if i use

const int defaultWidth = 768;
const int defaultHeight = 1024;
this->resize(defaultWidth,defaultHeight);

const int defaultWidth = 768;
const int defaultHeight = 1024;
this->resize(defaultWidth,defaultHeight);

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Screen Size: 1920 x 1080
Window Size: 768 x 1024

Screen Size: 800 x 600
Window Size: 800 x 600 its fit to the screen but i need it in 450x600 resolutions according to the 768x1024 gui screen size .