QApplication::desktop()

QApplication::desktop()是一个函数，用于获取桌面信息。在之前的代码中，它被用来获取QDesktopWidget对象，进而获取设备屏幕的大小。\[1\]然而，在QT6环境中，QDesktopWidget类已经过时，所以这段代码会报错。新的方法是使用QGuiApplication::screens()函数来获取屏幕信息。\[2\]这个函数返回一个QList<QScreen*>对象，每个QScreen对象代表一个屏幕。你可以使用QScreen类的方法来获取屏幕的大小和其他属性。如果你想打印屏幕的分辨率和个数信息，你可以使用类似下面的代码：\[3\]

void printScreenInfo() {
    QList<QScreen*> screens = QGuiApplication::screens();
    for (int i = 0; i < screens.size(); ++i) {
        QScreen* screen = screens.at(i);
        QRect screenRect = screen->availableGeometry();
        int screenWidth = screenRect.width();
        int screenHeight = screenRect.height();
        qCritical("Screen %d: width=%d, height=%d\n", i, screenWidth, screenHeight);
    }
    int screenCount = screens.size();
    qCritical("Total screen count: %d\n", screenCount);
}

这段代码会遍历所有的屏幕，并打印出每个屏幕的宽度和高度。最后，它会打印出屏幕的总数。
#### 引用[.reference_title]
- *1* [QApplication](https://blog.csdn.net/qq_36314864/article/details/114666016)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insert_down28v1,239^v3^insert_chatgpt"}} ] [.reference_item]
- *2* [QT6项目中，QApplication::desktop() 报错的问题](https://blog.csdn.net/m0_46576139/article/details/127749265)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insert_down28v1,239^v3^insert_chatgpt"}} ] [.reference_item]
- *3* [qt 获取屏幕分辨率](https://blog.csdn.net/flowerspring/article/details/113525716)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insert_down28v1,239^v3^insert_chatgpt"}} ] [.reference_item]
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