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POMonoTouch/Obj-C Binding How-To
 

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  1. POMonoTouch/Obj-C Binding How-To
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    <p>I'm working to create bindings for Obj-C library so that I can work together with another team together on same project. To ensure this works, I'm attempting to create a simple obj-c library, define bindings, and use that object within MonoTouch. I have no build issue or even runtime exceptions, but my return value from calling any function is always null.</p> <p>I started by created a new static library using Xcode and defined a 'Calculator' class. Below is the .h and .m</p> <pre><code>@interface Calculator : NSObject - (NSString*)getMessage; @end @implementation Calculator - (NSString*)getMessage { return @"hey, look at me!"; } @end </code></pre> <p>This built into the file 'libXcodeLib.a'. I defined the following MonoTouch bindings for this class and methods:</p> <pre><code> [BaseType(typeof(NSObject))] interface Calculator { [MonoTouch.Foundation.Export("getMessage")] string GetMessage(); } </code></pre> <p>As well as an additional AssemblyInfo.cs for gcc_flags with the following:</p> <pre><code>[assembly: LinkWith ("libXcodeLib.a", LinkTarget.Simulator | LinkTarget.ArmV6 | LinkTarget.ArmV7, ForceLoad = true)] </code></pre> <p>And finally, here's a look at the Makefile used to produce the .dll file</p> <pre><code>BTOUCH=/Developer/MonoTouch/usr/bin/btouch all: XcodeLib.dll XcodeLib.dll: Makefile ApiDefinition.cs AssemblyInfo.cs libXcodeLib.a $(BTOUCH) -e ApiDefinition.cs AssemblyInfo.cs --out=XcodeLib.dll --link-with=libXcodeLib.a,libXcodeLib.a </code></pre> <p>And here is sample code invoking this method:</p> <pre><code>var calc = new MTBindings.Calculator(); var msg = calc.GetMessage(); </code></pre> <p><strong>At this point, why is msg NULL?</strong></p> <p>From all the reading I've done, I cannot see what I'm missing to make this work. Any newer or proven samples/tutorials would be greatly appreciated, I'm not sure how to simplify this more - and yet it still doesn't work!</p> <p>Thanks to the SO community - I hope :)</p>
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    1. USMatt Klinker
    1. USMatt Klinker
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    1. COCould you ship your complete sample for me to look at?
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      1. USmiguel.de.icaza
    2. COyou could test if the ObjectiveC method "getMessage" is even executed by adding a NSLog inside of getMessage, that might point to a linking problem with your library
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