QLabel无法显示图片

转载于：https://blog.csdn.net/qiangzi4646/article/details/80764262

参考上述链接：

static QMap<int, QString> imageType = {
    {0xffd8ff, "jpg"},
    {0xffd8ff, "jpeg"},
    {0xffd8ff, "jpe"},
    {0x89504e47, "png"},
    {0x47494638, "gif"},
    {0x49492a00, "tif"},
    {0x424d, "bmp"},
    {0x424d228c01, "bmp16"},
    {0x424d824009, "bmp24"},
    {0x424d8e1b03, "bmp256"}
};

QString getImageType(QString img)
{
    QFile file(img);

    if (!file.open(QIODevice::ReadOnly)) {
        return "";
    }

    QDataStream in(&file);
    quint32 magic;
    in >> magic;

	file.close();

    if (imageType.contains(magic)) {
        return imageType[magic];
    }

    return "";
}

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