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POMonoTouch System.EntryPointNotFoundException for a DLL
 

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  1. POMonoTouch System.EntryPointNotFoundException for a DLL
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    <p>I'm trying to make a DLL with some native code functions that are accessed by my MonoTouch app. I followed the general methodology used by monotouch-bindings, where you:</p> <ul> <li>make an xcode project and put some native code in it</li> <li>build a static library (.a file) with xcodebuild</li> <li>run btouch with --link-with to make a .dll file</li> <li>add a reference to the .dll file in my MonoTouch app</li> </ul> <p>.. but whenever I try to use these functions in my app, I get System.EntryPointNotFoundException. Here's code for each thing I'm trying to do:</p> <p><strong>In the .cpp file:</strong></p> <pre><code>extern "C" { int SomeFunction(); } int SomeFunction() { ... } </code></pre> <p><strong>Command line to build the .a file</strong></p> <pre><code>xcodebuild -project MyStaticLibrary.xcodeproj -target MyStaticLibrary -sdk iphonesimulator -configuration Release clean build </code></pre> <p><strong>The .cs file (NativeBindings.cs) with the bindings</strong></p> <pre><code>public class MyStaticLibraryBindings { [ DllImport( "__Internal" ) ] public extern static int SomeFunction(); } </code></pre> <p><strong>AssemblyInfo.cs for the DLL</strong></p> <pre><code>using System; using MonoTouch.ObjCRuntime; [assembly: LinkWith ("libMyStaticLibrary.a", LinkTarget.Simulator | LinkTarget.ArmV7 | LinkTarget.ArmV7s, IsCxx = true, ForceLoad = true, Frameworks = "", WeakFrameworks = "")] </code></pre> <p><strong>The command line to build the .dll</strong></p> <pre><code>btouch -x=NativeBindings.cs AssemblyInfo.cs --out=NativeBindings.dll --link-with=libMyStaticLibrary.a,libMyStaticLibrary.a </code></pre> <p>.. the DLL builds fine, and my app sees the MyStaticLibraryBindings.SomeFunction function during compilation, but at runtime when I call it, I get System.EntryPointNotFoundException.</p> <p>I have verified that libMyStaticLibrary.a <em>does</em> contains SomeFunction:</p> <pre><code>~/build&gt; nm libMyStaticLibrary.a* 00000167 T _SomeFunction </code></pre>
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      1. VTUpMod
    1. COCan you add "-v -v -v" (without the quotes) to the additional mtouch arguments in the project's iOS Build options page and upload the complete build log somewhere (pastebin, gist, etc)?
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      1. POMonoTouch System.EntryPointNotFoundException for a DLL
      1. USRolf Bjarne Kvinge
    2. COSure: http://pastebin.com/yNi0MPSi
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      1. POMonoTouch System.EntryPointNotFoundException for a DLL
      1. USMike
    3. CODo you have a LinkWith attribute in your AssemblyInfo.cs (and exactly how is it)? It doesn't look like Xamarin.iOS extracted the native library from the binding project, which is probably due to something wrong with the LinkWith attribute.
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      1. POMonoTouch System.EntryPointNotFoundException for a DLL
      1. USRolf Bjarne Kvinge
 

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