How do I get selected channel indexes?

[ART CORNER]

I can get the names of all the current channels in a document with:

But sometimes a document has multiple channels with identical names. So when I perform actions based on the channels returned this way.

Is there a way to get the indexes of every channel, rather than the names?

I also convert it into RGB.

Thanks,

Sunil

[c.pfaffenbichler]

One work-around for multichannel-images: 

// get indices of selected channels for multichannel files;
// 2022, use it at your own risk;
if (app.documents.length > 0) {
var myDocument = activeDocument;
if (myDocument.mode == DocumentMode.MULTICHANNEL) {
var ref = new ActionReference();
ref.putProperty (stringIDToTypeID ("property"), stringIDToTypeID ("numberOfChannels"));
ref.putEnumerated( charIDToTypeID("Dcmn"), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") ); 
var docDesc = executeActionGet(ref);
var numberChannels = docDesc.getInteger(stringIDToTypeID("numberOfChannels"));
////////////////////////////////////
var theSelCh = myDocument.activeChannels;
var theTestName = "ignoreAndRestoreThisName"+Math.random();
var theSelectedChannelsIndices = new Array;
for (var m = 0; m < theSelCh.length; m++) {
	theSelCh[m].name = theTestName;
	for (var n = 0; n < numberChannels; n++) {
		if (myDocument.channels[n].name == theTestName) {theSelectedChannelsIndices.push(n)}
	};
	executeAction( charIDToTypeID("undo"), undefined, DialogModes.NO );
};
alert ("selected channels indices\n"+theSelectedChannelsIndices.join("\n"));
}
};

[c.pfaffenbichler]

Personally I prefer »indices« as the plural of »index« but I suspect that’s kinda pretentious. 

Anyway, I failed to notice an easy access to the index of the selected Channels either in DOM and AM. 

And in RGB images the renaming-work-around runs into problems with the composite channels (I expect the same for Lab and CMYK) and alpha-channels could also be named »Red«, »Green« and »Blue«, so a channel-deletion-work-around for the first three items in the array of the selected channels might be necessary. 

Maybe I have overlooked something and someone else can provide an easier solution. 

[ART CORNER]

c.pfaffenbichler 

Thank you sir....