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Editorial Team
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Asked: 2026-06-07T23:36:46+00:00

I am porting coding from Objective C to MonoTouch to use an external accessory.

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I am porting coding from Objective C to MonoTouch to use an external accessory. It is super basic coding, however when I create The EASession and try to use the InputStream or OutputStream, they are both NULL. I have used it in Objective-C so I know this should not happen.

I am able to repeatedly connect/disconnect the device and detect it. Now I just can’t seem to read the data from the device because of this null issue. Below is my coding:

session = new EASession(acc, “com.idtechproducts.reader”);

session.OutputStream.Delegate = streamDel; // Crashed saying OutputStream is null

session.OutputStream.Schedule (NSRunLoop.Current , “NSDefaultRunLoopMode”);

session.OutputStream.Open ();

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1 Answer

  1. Editorial Team

    You need to list the external accessories you’re going to use in your
    Info.plist.

    There is some documentation on this on apple’s site:
    http://developer.apple.com/library/ios/#featuredarticles/ExternalAccessoryPT/Introduction/Introduction.html#//apple_ref/doc/uid/TP40009502

    Here is a screenshot of how to set this value in Info.plist:
    http://screencast.com/t/AYmOWjf8wkL

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