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Improve exception message when a type cannot be converted during marshaling #90

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Improve exception message when a type cannot be converted during marshaling #90

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15 changes: 13 additions & 2 deletions src/ObjCRuntime/NSObjectMarshaler.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -29,8 +29,19 @@ namespace MonoMac.ObjCRuntime {
public class NSObjectMarshaler<T> : ICustomMarshaler where T : NSObject {
static NSObjectMarshaler<T> marshaler;

public object MarshalNativeToManaged (IntPtr handle) {
return (T) Runtime.GetNSObject (handle);
public object MarshalNativeToManaged (IntPtr handle)
{
if (handle == IntPtr.Zero)
return null;

var obj = Runtime.GetNSObject (handle);
if (!(obj is T)) {
throw new MarshalDirectiveException (
string.Format ("NSObjectMarshaler<{0}>: Could not cast from type {1}", typeof(T), obj.GetType ()));
}
else {
return (T) obj;
}
}

public IntPtr MarshalManagedToNative (object obj) {
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