javascript - how to get the base64 string of the clipboard data? -


i building xpcom component js. have got clipboard data in js, when data type image/png, want base64 string, code is:

        ......         trans.adddataflavor('image/png');         clipboard.getdata(trans, services.clipboard.kglobalclipboard);         trans.gettransferdata('image/png', str, strlength);         let mw = services.wm.getmostrecentwindow("navigator:browser");          data.data = str.value.queryinterface(ci.nsisupportscstring).data;         data.data = mw.btoa(data.data);         ...

i can base64 string under linux, when run code in windows, got error: ns_nointerface: component returned failure code: 0x80004002 (ns_nointerface) [nsisupports.queryinterface]

data.data = str.value.queryinterface(ci.nsisupportscstring).data; not konw how base64 string of image data in xpcom component, can give me answer?

apparently images stored clipboard differently across platforms. check how jetpack reads them.


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