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    <p>You cannot use <code>NSArray</code> unless the Objective-C code uses <code>NSArray</code>, i.e. the generator allows us to map some ObjC constructs to .NET types (e.g. <code>NSString</code> to <code>string</code>) but it won't allow you to redefine ObjC types.</p> <pre><code>-(BOOL)playSound:(int)volume beepData:(int *)data length:(int)length error:(NSError **)error; </code></pre> <p>should be like:</p> <pre><code>[Export ("playSound:beepData:length:error:")] bool PlaySound (int volume, IntPtr data, int length, out NSError error); </code></pre> <p>You'll need to marshal your <code>data</code> into an <code>IntPtr</code>.</p> <pre><code>IntPtr data = Marshal.AllocHGlobal (length); Marshal.WriteInt32 (data1, 0); </code></pre> <p>and free it afterward.</p> <pre><code>Marshal.FreeHGlobal (data); </code></pre> <p>That's best done using a public helper method which calls your <strong>internal</strong> binding. You can make the <code>PlaySound</code> method <code>internal</code> by adding a <code>[Internal]</code> attribute to it's definition. So it becomes:</p> <pre><code>[Export ("playSound:beepData:length:error:")][Internal] bool PlaySound (int volume, IntPtr data, int length, out NSError error); </code></pre> <p>and you include the following code with your bindings (e.g. API.cs):</p> <pre><code>bool PlaySound (int volume, int[] data) { // I assume length is byte-based (check the docs) int length = data.Length * 4; IntPtr p = Marshal.AllocHGlobal (length); int j = 0; for (int i=0; i &lt; length; i+=4) Marshal.WriteInt32 (p [j++], i); NSError error; bool result = PlaySound (volume, p, length, out error); // free memory before throwing the exception (if any) Marshal.FreeHGlobal (data); if (error != null) throw new Exception (error.LocalizedDescription); return result; } </code></pre> <p>note: totally untried :-) I do not have the hardware, SDK or documentation. YMMV but that should be close.</p>
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    1. POMonotouch Binding to Linea Pro SDK
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    1. COYou're a gentleman and a scholar. I'll give this a try tomorrow morning. Thanks!
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    2. COIt's a no-go. Mono balks at the Marshal.WriteInt32 (p [j++], i), so I changed it to `Marshal.WriteInt32 (p, i, data[j++])`, still nothing. Also tried to get the IntPtr with GCHandle.Alloc, nothing. I tried in xcode, `int sound[]={2730,150,0,30,2730,2730}; int size = sizeof(sound); [linea playSound:100 beepData:sound length:size error:nil];`, and this works. When the debugger hits the actual PlaySound line, the application output shows `-[Linea playSound:beepData:length:error]: unrecognized selector sent to instance 0xa2e6b40`, but no real error is thrown.
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    3. COI do not know what's your original data format. Look at other `Marshal` methods (like `Copy`) to copy your data. You can also try to bind this as a `(int*)` and used `unsafe fixed` in your helper method. But without hardware and context all we can do is guess ;-)
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