Hi, I think what you want to do is change this:
[BaseType (typeof(NSObject))] interface TcpPrinterConnection : ZebraPrinterConnection to this: [BaseType (typeof(ZebraPrinterConnection))] interface TcpPrinterConnection On Wed, Jun 13, 2012 at 4:19 AM, Дмитрий Надеждин <denadezh...@gmail.com>wrote: > Dear MonoTouch subscribers, > > The same question is here: > http://stackoverflow.com/questions/11008726/binding-of-zebra-sdk-to-monotouch > > Short version: I have created a binding for Zebra native library for > mobile printers and the basic functionality works fine (wireless connection > between the printer and the iPad, writing data to streams, printing out > text, etc.) > I want to print out PDFs and images, and the native library provides the > classes for that. However, I can't get it to work from Monotouch. > > > Long version: I have problem binding the structure described below. > > @protocol ZebraPrinterConnection > - (BOOL) open; > - (void) close; > - (NSInteger) write:(NSData *)data error:(NSError **)error; > - (NSData *)read: (NSError**)error; > > @interface TcpPrinterConnection : NSObject<ZebraPrinterConnection> { > some @private properties > } > - (id)initWithAddress:(NSString *)anAddress andWithPort:( > NSInteger)aPort; > > @interface ZebraPrinterFactory : NSObject { } > +(id<ZebraPrinter,NSObject>) getInstance:(id<ZebraPrinterConnection, > NSObject>) connection error:(NSError**)error > > > The tricky part here is to obtain ZebraPrinter instance in Monotouch code. > Note how ZebraPrinterFactory wants ZebraPrinterConnection to be passed to > it, but onlyTcpPrinterConnection has an actual constructor. > The connection classes work fine when bound like this: > > [BaseType (typeof (NSObject))] > [Model] > interface ZebraPrinterConnection > { > > [Export ("open")] bool Open(); > > [Export ("close")] void Close(); > [Export ("write:error:")] int Write(NSData data, out NSError error); > [Export ("read:")] NSData Read(out NSError error); > > } > > [BaseType (typeof(NSObject))] > interface TcpPrinterConnection : ZebraPrinterConnection > { > > [Export ("initWithAddress:andWithPort:")] IntPtr Constructor (string > anAddress, int aPort); > > } > > Binding of ZebraPrinterFactory class is not as straightforward. If I bind > it like this: > > [BaseType (typeof(NSObject))] > interface ZebraPrinterFactory > { > > [Static, Export ("getInstance:error:")] > > ZebraPrinter getInstance(ZebraPrinterConnection connection, out NSError > error); > > } > > then I try to use something like > > myConn = new TcpPrinterConnection(ipAddress, port); > myConn.Open (); > ZebraPrinter zPrinter = ZebraPrinterFactory.GetInstance(myConn, out err); > // compile-time error: Cannot convert TcpPrinterConnection > into ZebraPrinterConnection > > I get a compile-time error. If I change the binding for Mono to > accept TcpPrinterConnection as parameter (I've tried multiple > configurations), I get runtime exception ("System.InvalidCastException: > Cannot cast from source type to destination type.") which has no inner > exceptions and I have no idea which type could not be converted (strongly > suspecting that same conversion as above). > It's really frustrating having something ALMOST working, but not quite. > > Any ideas? I'm starting to think of binding limitations already. Could > someone tell me if such structures can be bound at all? > > Regards, Dmitry > > _______________________________________________ > MonoTouch mailing list > MonoTouch@lists.ximian.com > http://lists.ximian.com/mailman/listinfo/monotouch > >
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