private SignatureInfo DoEncodingToSig(string encoding)
{
SignatureInfo info;
lock (ms_lock)
{
if (!ms_encodedTable.TryGetValue(encoding, out info))
{
Class klass = new Class("NSMethodSignature");
IntPtr exception = IntPtr.Zero;
IntPtr instance = DirectCalls.Callpp(klass, signatureWithObjCTypes, Marshal.StringToHGlobalAnsi(encoding), ref exception);
if (exception != IntPtr.Zero)
{
CocoaException.Raise(exception);
}
if (instance == IntPtr.Zero)
{
throw new InvalidCallException(string.Format("Couldn't find the method signature for {0}", encoding));
}
info = new SignatureInfo(instance);
ms_encodedTable.Add(encoding, info);
klass.release();
}
}
return(info);
}
// Note that if we don't do all of this caching the memory tests fail.
private SignatureInfo DoClassSelectorToSig(IntPtr target, IntPtr selector)
{
SignatureInfo info = null;
IntPtr exception = IntPtr.Zero;
IntPtr id = DirectCalls.Callp(target, klass, ref exception);
if (exception != IntPtr.Zero)
{
CocoaException.Raise(exception);
}
lock (ms_lock)
{
KeyValuePair <IntPtr, IntPtr> key = new KeyValuePair <IntPtr, IntPtr>(id, selector);
if (!ms_selectorTable.TryGetValue(key, out info))
{
// If target's class is itself then target is a class and we need to use
// methodSignatureForSelector to get the class method. Otherwise we'll use
// instanceMethodSignatureForSelector to see if the class has an instance
// method. If that fails we'll fall back on DoInstanceSelectorToSig to see
// if the instance has the method.
IntPtr instance;
if (id == target)
{
instance = DirectCalls.Callpp(id, methodSignatureForSelector, selector, ref exception);
}
else
{
instance = DirectCalls.Callpp(id, instanceMethodSignatureForSelector, selector, ref exception);
}
if (exception != IntPtr.Zero)
{
CocoaException.Raise(exception);
}
if (instance != IntPtr.Zero)
{
info = new SignatureInfo(instance);
ms_selectorTable.Add(key, info);
}
}
}
return(info);
}
private SignatureInfo DoInstanceSelectorToSig(IntPtr target, IntPtr selector)
{
IntPtr exception = IntPtr.Zero;
IntPtr instance = DirectCalls.Callpp(target, methodSignatureForSelector, selector, ref exception);
if (exception != IntPtr.Zero)
{
CocoaException.Raise(exception);
}
if (instance == IntPtr.Zero)
{
string cn = new NSObject(target).class_().Name;
string sn = new Selector(selector).Name;
throw new InvalidCallException(string.Format("Couldn't find the method signature for {0} {1}", cn, sn));
}
return(new SignatureInfo(instance));
}
