来自unsigned char缓冲区的QImage（jpg格式） [英] QImage from unsigned char buffer (jpg format)

问题描述

我有 unsigned char * 类型的缓冲区，我用JPG图像填充。我想使用这个缓冲区在QLabel中将图像绘制到我的应用程序屏幕。

I have buffer of type unsigned char* which I fill with JPG image. I want to use this buffer to draw the image to my application screen in a QLabel.

我已经完成了这个，但是图像不正确。

I've done this, but the image is incorrect.

谁能告诉我最好的方法是什么？

Can anyone tell me what the best way to do this is?

QPixmap pix = QPixmap::fromImage(
     QImage(buff, 460, 345, QImage::Format_RGB888)); //Not sure what format to use for a jpg image?

one_img->setPixmap(pix);  //one_img is of type QLabel.

推荐答案

QImage :: load 或 QImage 构造函数期望图像缓冲区处于未压缩格式。

QImage::load or the QImage constructor expect the image buffer to be in an uncompressed format.

如果你不打算修改图像，使用 QPixmap 及其 loadFromData（）函数：

If you don't intend to modify the image, use QPixmap and its loadFromData() function:

QPixmap pix;
pix.loadFromData(buff, sizeOfBuff, "JPG");

您还可以使用 QImage :: fromData / QImage :: loadFromData ，或 QImageReader + QBuffer 。

You can also load a Jpeg buffer with QImage::fromData / QImage::loadFromData, or QImageReader + QBuffer.

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