QML Image: Invalid image provider: image://colors/yellow

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/keneyr/article/details/89153585

就是在运行QT给出的官方示例的时候，告诉我这个错误。。尼玛把我给急死了。。。死活找不到错误。这怎么还无效呢？当时是看着该博客进行的coding

https://blog.csdn.net/luoyayun361/article/details/61936032

然后博主告诉了我问题。。。竟然是如此naive的问题。。汗颜。。

我的代码如下：

main.cpp

int main(int argc, char *argv[])

{

    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);



    QApplication app(argc, argv);

    QSurfaceFormat fmt;

    fmt.setDepthBufferSize(24);

    fmt.setVersion(3, 2);

    fmt.setProfile(QSurfaceFormat::CoreProfile);

    QSurfaceFormat::setDefaultFormat(fmt);

    QQmlApplicationEngine engine;


    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    engine.addImageProvider(QLatin1String("colors"),new ColorImageProvider);

    if (engine.rootObjects().isEmpty())

        return -1;

    return app.exec();

}

main.qml

Window {
Image{
        source: "image://colors/yellow"
    }
}

ColorImageProvider.cpp

#include "include/ColorImageProvider.h"

ColorImageProvider::ColorImageProvider():
    QQuickImageProvider(QQuickImageProvider::Pixmap){
}

ColorImageProvider::~ColorImageProvider(){
}

QPixmap ColorImageProvider::requestPixmap(const QString &id, QSize *size, const QSize &requestedSize){

    int width = 100;

    int height = 50;

    if(size)

        *size = QSize(width,height);

    QPixmap pixmap(requestedSize.width()>0?requestedSize.width():width,

                   requestedSize.height()>0?requestedSize.height():height);

    pixmap.fill(QColor(id).rgba());

    return pixmap;

}

ColorImageProvider.h

#ifndef COLORIMAGEPROVIDER
#define COLORIMAGEPROVIDER
#include <QQuickImageProvider>
#include <QImage>
#include <QPixmap>

class ColorImageProvider:public QQuickImageProvider{
public:
    ColorImageProvider();
    ~ColorImageProvider();
    QPixmap requestPixmap(const QString &id, QSize *size, const QSize &requestedSize);
    //QImage requestImage(const QString &id, QSize *size, const QSize &requestedSize);

};
#endif // COLORIMAGEPROVIDER

报错：

其实错误就是我在main.cpp里面，在加载qml文件之后注册了。应该把这两行代码颠倒一下：

感谢大佬帮忙。再次为自己的菜而感到深深的羞愧 - - 

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