[QGIS-Developer] Generate legend and export as Image

[M S.]

hi all.
i was able to generate a legend when i was using  QGIS 2.18  by
QgsComposerLegend().Then i used to export it with help of QImage().
But now i use QGIS 3.10 and i have to use QgsPrintLayout() and
QgsLayoutItemLegend() to generate legend  and i export it  via
QgsLayoutExporter(). But i have some issue with that:
1. it exceeds or crops legend content.
2. i got below error message when i create more than one object of my class
which has QgsPrintLayout() object : "RuntimeError: wrapped C/C++ object of
type QgsPrintLayout has been deleted"

can you please guide me about this?
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