QPixmap加载BMP图片，内存溢出，怎么办？

2015-01-19 01:50:03 1.2k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

基于Qt C++的轻量级图片浏览器开发：从架构设计到性能优化在桌面应用开发领域，GUI框架的选择与性能优化是核心议题。Qt作为成熟的跨平台C++框架，其信号槽机制和图形视图体系为构建高性能应用提供了坚实基础。通过Model-View架构实现业务逻辑与界面解耦，能显著提升代码可维护性和扩展性。在图像处理场景中，高效的内存管理与资源加载是关键的技术价值所在，直接影响应用的响应速度和用户体验。例如，利用LRU缓存策略管理图像资源，并结合异步加载机制，可以有效解决大文件I/O导致的界面卡顿问题。这些技术广泛应用于需要本地文件管理和快速图像预览的客户端软件，如相册管理、设计素阅读详情

初始化后两个label可以显示图片，当点击按钮切换两个label显示图片后，求报错：QImage: out of memory, returning null image。我的每张图片都是6512*11635的BMP图片，大小为72.2M，我觉得是加载的缓存区不够大导致的，需要每次显示需要清理缓存区，不知道对不对，求大神指点下
void MinImage::loadMinImage() //初始化
{
i = 1;
QDir dir("/image1","*.bmp");
if(!dir.exists())
return;
dir.setSorting(QDir::Time);//文件排列方式：时间

background1.load(QString("E:/image1/%1").arg(dir[dir.count()-i]));
background1 = background1.scaled(background1.width(),background1.height(),Qt::KeepAspectRatio);
label_image1->setPixmap(background1);
i++;
background2.load(QString("E:/image1/%1").arg(dir[dir.count()-i]));
background2 = background2.scaled(background2.width(),background2.height(),Qt::KeepAspectRatio);
label_image2->setPixmap(background2);
}

void MinImage::Right_Button_clicked()
{
QDir dir("/image1","*.bmp");
dir.setSorting(QDir::Time);
if(i==dir.count())
{
QMessageBox::warning(this,"warning","Has reached the final!");
}
else
{
i++;
background1.load(QString("E:/image1/%1").arg(dir[dir.count()-i+1]));
background1 = background1.scaled(background1.width(),background1.height(),Qt::KeepAspectRatio);
label_image1->setPixmap(background1);
background2.load(QString("E:/image1/%1").arg(dir[dir.count()-i]));
background2 = background2.scaled(background2.width(),background2.height(),Qt::KeepAspectRatio);
label_image2->setPixmap(background2);
}

}

void MinImage::Left_Button_clicked()
{
QDir dir("/image1","*.bmp");
dir.setSorting(QDir::Time);
if(i==2)
{
QMessageBox::warning(this,"warning","Has reached the final!");
}
else
{
i--;
background1.load(QString("E:/image1/%1").arg(dir[dir.count()-i+1]));
background1 = background1.scaled(background1.width(),background1.height(),Qt::KeepAspectRatio);
label_image1->setPixmap(background1);
background2.load(QString("E:/image1/%1").arg(dir[dir.count()-i]));
background2 = background2.scaled(background2.width(),background2.height(),Qt::KeepAspectRatio);
label_image2->setPixmap(background2);
qDebug()<<i;
}
}

...全文

Matlab激活失败？手把手教你解决License checkout failed问题（附详细截图）本文针对Matlab激活后出现“License checkout failed”错误的常见问题，提供了详细的解决方案。核心在于精准定位并正确填写Windows系统用户名，而非计算机名或账户全名。文章通过分步截图和命令指引，手把手教你使用`whoami`命令获取正确信息，并重新运行激活程序，从根本上解决因用户名填写错误导致的许可检查失败问题。阅读详情

你的OPPA

Qt 21,503 成员 26,693 内容

+ 关注 + 加入社区

切换为时间正序

zhaomick 2015-01-25

打赏
举报

我也遇到这个问题了

dbzhang800 2015-01-19

打赏
举报

引用 4 楼 u011330815 的回复:

[quote=引用 3 楼 dbzhang800 的回复:] 去看看QImageReader吧，或许对你有用 QImageReader is a specialized class which gives you more control when reading images. For example, you can read an image into a specific size by calling setScaledSize(), and you can select a clip rect, effectively loading only parts of an image, by calling setClipRect(). Depending on the underlying support in the image format, this can save memory and speed up loading of images.

这样的话就要换QImage类型了啊，能不能用QPixmap[/quote] 你前面的用的QPixmap加载文件的代码，内部也是通过QImageReader 读入到QImage，而后转成 QPixmap 来实现的。不然，你不觉得，你没有用QImage，但是报错的却是QImage，很奇怪么？

你的OPPA 2015-01-19

打赏
举报

引用 3 楼 dbzhang800 的回复:

去看看QImageReader吧，或许对你有用 QImageReader is a specialized class which gives you more control when reading images. For example, you can read an image into a specific size by calling setScaledSize(), and you can select a clip rect, effectively loading only parts of an image, by calling setClipRect(). Depending on the underlying support in the image format, this can save memory and speed up loading of images.

这样的话就要换QImage类型了啊，能不能用QPixmap

dbzhang800 2015-01-19

打赏
举报

去看看QImageReader吧，或许对你有用 QImageReader is a specialized class which gives you more control when reading images. For example, you can read an image into a specific size by calling setScaledSize(), and you can select a clip rect, effectively loading only parts of an image, by calling setClipRect(). Depending on the underlying support in the image format, this can save memory and speed up loading of images.

你的OPPA 2015-01-19

打赏
举报

怎么还没有人啊！哪个大神帮忙指点一下啊！急······

你的OPPA 2015-01-19

打赏
举报

经过调试，问题就是在点击按钮后出发的函数里面的load加载图片。我用QPixmapCache：：clear（）也没有用，该肿么办？求大神指点

QPixmap加载BMP图片，内存溢出，怎么办？

相关推荐