C++ 从 Qt 中的 QByteArray 加载 QPixmap?
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Load QPixmap from QByteArray in Qt?
提问by user662285
I have a byte array with the contents of an image (in png/bmp or some other format).
我有一个包含图像内容的字节数组(png/bmp 或其他格式)。
How can I load it into a QPixmap?
如何将其加载到 QPixmap 中?
回答by Raiv
bool QPixmap::loadFromData ( const QByteArray & data, const char * format = 0, Qt::ImageConversionFlags flags = Qt::AutoColor )
Format here is string literal like "PNG"
or something similar
这里的格式是字符串文字"PNG"
或类似的东西
QPixmap p;
QByteArray pData;
// fill array with image
if(p.loadFromData(pData,"PNG"))
{
// do something with pixmap
}
回答by Matyas
You should use the folowing, where your bytes are in the imageData variable in the format specified by the last parameter:
您应该使用以下内容,其中您的字节以最后一个参数指定的格式位于 imageData 变量中:
QPixmap pixmap = QPixmap::fromImage(
QImage(
(unsigned char *) imageData,
image_width,
image_height,
QImage::Format_RGB888
)
);
回答by Aaron Digulla
Use this constructor:
使用这个构造函数:
QImage ( const uchar * data, int width, int height, Format format )
Here is more info. After that, you can use QPixmap.convertFromImage()
to create a pixmap.
这里有更多信息。之后,您可以使用它QPixmap.convertFromImage()
来创建像素图。