亲爱的交易者和API大师，

感谢你在前进。

背景：

在Visual Studio 2010中，C＃语言，ActiveX的OCX API作为项目的参考。 在先后使用像reqAccountUpdate所提供的API的方法和使用事件接收有关帐户的更新信息。

问题：

现在，我想需要大约像一个外汇对一个特定的金融工具的数据：AUD.USD

一个。第1步：继承TWSLib类IContract的界面我的code是这里的图片和构造函数是具体的AUD.USD：             

正如你可以看到，我修改了私有对象_combolLegs私人TWSLib.IComboLeg _comboLegs

乙。第2步：我也继承IComboleg和IUpdateComp到ComboLeg和UpdateComp，我不指定任何价值，他们，因为他们是没有关系的                      到了AUD.USD外汇交易。

℃。现在，我创建了合同的实例，并尝试分配所需的所有信息，外汇合约，并提交我的查询。

Ð。它是一个运行时错误。请点击这里查看图片：

这似乎是我创建不能由API作为正式IContract实例接受合同的实例。从任何.NET大师知不知道？）

感谢很多提前再次，

谦逊的学习者。

灏

修改

有关IContract的细节我的一切SOFAR

解决方案

  //试着改变你实现，你必须在接口/ CLASE方式
//  -  VAR auduse =新合同（）;

//根据装箱和拆箱从这个角度扭转它并执行以下操作
IContract iaudUse =新合同（）;
//那么你可以使用iaudUse。什么都的方法在你想要使用的接口。
 

Dear all trader and API Gurus,

Thank you in advance.

Background:

Visual Studio 2010, C# Language, ActiveX OCX API as reference of project. Successively to use the method provided by API like reqAccountUpdate and use the event to receive information about account update.

Issue:

Now I would like to require data about one specific financial instrument like a forex pair: AUD.USD .

a. Step 1: Inherit the interface of class IContract from TWSLib my Code is here as a picture and the constructor is specific for AUD.USD:

As you can see that I have change the private object _combolLegs to private TWSLib.IComboLeg _comboLegs

b. Step 2: I also inherit the IComboleg and IUpdateComp to ComboLeg and UpdateComp and I do not assign any value to them since they are not related to the the AUD.USD forex trading.

c. Now I create a instance of contract and try to assign all information forex contract required for and submit my query.

d. it is a runtime error. Please check the picture here:

It seems like the contract instance I created could not be accepted by the api as formal IContract instance. Any idea from any .NET gurus?:)

Thanks lot in advance again,

Humble learner.

Wenhao

Edit

about the detail of IContract all I got sofar

解决方案

//Try changing the way that you implement the Interface / Clase where you have 
// -- var auduse = new Contract();

//depending on boxing and unboxing from this point try to reverse it and do the following
IContract iaudUse = new Contract();
//then you would use iaudUse. what ever method in the Interface that you are wanting to use.