multiple-interface-implem

How does implementing multiple COM interfaces work in C++?

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问题 I am trying to understand this example code regarding Browser Helper Objects. Inside, the author implements a single class which exposes multiple interfaces (IObjectWithSite, IDispatch). His QueryInterface function performs the following: if(riid == IID_IUnknown) *ppv = static_cast<BHO*>(this); else if(riid == IID_IObjectWithSite) *ppv = static_cast<IObjectWithSite*>(this); else if (riid == IID_IDispatch) *ppv = static_cast<IDispatch*>(this); I have learned that from a C perspective,

two interfaces, multiple inheritance combine into one container?

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问题 I stumbled upon the following problem: I have two packages A and B working fine for each own. Each has its own interface and his own implementation. Now i made a package C combining a adapter of A with a concrete Implemenation of B. C actually only implements the Interface of A and is only inheritating and using the Interface of B internally for now. Most of the times that was enough to have only access to the Interface A from a Container, but now i need the methods from B accessible too.

two interfaces, multiple inheritance combine into one container?

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Serialize Dictionary<TKey, TValue> to JSON with DataContractJsonSerializer

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问题 I have an object tree that I'm serializing to JSON with DataContractJsonSerializer . Dictionary<TKey, TValue> gets serialized but I don't like the markup - the items are not rendered like this: {key1:value, key2:value2} but rather like an array of serialized KeyValuePair<TKey, TValue> objects: [{ "__type":"KeyValuePairOfstringanyType:#System.Collections.Generic", "key":"key1", "value":"value1" }, { "__type":"KeyValuePairOfstringanyType:#System.Collections.Generic", "key":"key2", "value":

Can I globally set the interface implementation to use?

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问题 I have an interface: public interface IHHSDBUtils { void SetupDB(); bool TableExists(string tableName); . . . ...that has multiple implementers: public class SQLiteHHSDBUtils : IHHSDBUtils public class SQCEHHSDBUtils : IHHSDBUtils public class FlatfileHHSDBUtils : IHHSDBUtils public class TestHHSDBUtils : IHHSDBUtils I want to be able to specify which implementer is going to be used from a globally accessible spot, such as: public static class HHSConsts { public static IHHSDBUtils hhsdbutil =

Serialize Dictionary<TKey, TValue> to JSON with DataContractJsonSerializer

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I have an object tree that I'm serializing to JSON with DataContractJsonSerializer . Dictionary<TKey, TValue> gets serialized but I don't like the markup - the items are not rendered like this: {key1:value, key2:value2} but rather like an array of serialized KeyValuePair<TKey, TValue> objects: [{ "__type":"KeyValuePairOfstringanyType:#System.Collections.Generic", "key":"key1", "value":"value1" }, { "__type":"KeyValuePairOfstringanyType:#System.Collections.Generic", "key":"key2", "value":"value2" }] Ugly, isn't it? So, I avoid this by wrapping the generic Dictionary in a custom object that

Java Multiple Inheritance

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问题 In an attempt to fully understand how to solve Java\'s multiple inheritance problems I have a classic question that I need clarified. Lets say I have class Animal this has sub classes Bird and Horse and I need to make a class Pegasus that extends from Bird and Horse since Pegasus is both a bird and a horse. I think this is the classic diamond problem. From what I can understand the classic way to solve this is to make the Animal , Bird and Horse classes interfaces and implement Pegasus from