QLabel直接加载url设置图标

 

#include <QApplication>  
#include <QLabel>  
#include <QPixmap>  
#include <QNetworkAccessManager>  
#include <QNetworkReply>  
#include <QUrl>  

class ImageLabel : public QLabel {  
    Q_OBJECT  

public:  
    ImageLabel(const QUrl& url, QWidget *parent = nullptr) : QLabel(parent) {  
        QNetworkAccessManager *manager = new QNetworkAccessManager(this);  
        connect(manager, &QNetworkAccessManager::finished, this, &ImageLabel::onImageDownloaded);  
        manager->get(QNetworkRequest(url));  
    }  

private slots:  
    void onImageDownloaded(QNetworkReply *reply) {  
        if (reply->error() == QNetworkReply::NoError) {  
            QPixmap pixmap;  
            pixmap.loadFromData(reply->readAll());  
            setPixmap(pixmap);  
        }  
        reply->deleteLater();  
    }  
};  

int main(int argc, char *argv[]) {  
    QApplication app(argc, argv);  
    
    QUrl imageUrl("https://example.com/image.png");  
    ImageLabel label(imageUrl);  
    label.show();  

    return app.exec();  
}  

#include "main.moc"