Forexconnect api vb6
This article describes how to start using ForexConnect. Here you can find the API basics explained forexconnect api vb6 step-by-step instructions on creating a working sample of a simple trading application. Microsoft Visual Forexconnect api vb6, NET library usage with the Microsoft Silverlight application framework is not supported. NET library running using Mono is not supported. You must distribute your program with all binary libraries and supporting files from "C: ForexConnect libraries and supporting files must be located in the folder where your application is installed.
All APIs used by ForexConnect are asynchronous, so you will have to implement an event-driven architecture in your code. An event-driven architecture is a software architecture pattern that manages the behavior of production, detection and consumption of events as well as the responses they evoke.
In this context, an event should be treated as some value or message that can be identified within an ongoing stream of monitored inputs, such as specific conditions or signals or something else. Event-driven architectures usually consist of event producers and event consumers.
Event consumers subscribe to some event forexconnect api vb6, and event producers publish to this manager. When the manager receives an event from a producer, it forwards this event to all registered consumers or stores the event for later forwarding.
An event handler is a callback forexconnect api vb6 that operates asynchronously and handles inputs received into a program events. In this context, an event is some meaningful element of application information from an underlying development framework, forexconnect api vb6 from a graphical user interface GUI toolkit or some kind of input routine. On the GUI side, for example, events include key strokes, mouse activity, action selections, or timer expirations.
On the input side, events include opening or closing files and forexconnect api vb6 streams, reading data and so on. Forexconnect api vb6 handling is the receipt of an event at some event handler from an event forexconnect api vb6 and subsequent processes.
Forexconnect api vb6 benefit of event-driven architectures is that they enable arbitrarily large collections of consumers and producers, along with some number of managers, to exchange ongoing status and forexconnect api vb6 information. They are also usually fairly responsive to events as they occur, and work well in unpredictable and asynchronous communication environments. So you can use appropriate. However you can implement them and use them to receive notifications from forexconnect api vb6 session object after subscription if this is more suitable for you.
Note that all event handlers that you have implemented for O2GSession events are called in a separate thread. So you must keep in mind the following:. You do not need any additional resource management for objects obtained using ForexConnect. However it is forexconnect api vb6 to call the Dispose method for all obtained objects which implement it. These calls allow you to free unused system resources more effectively.
You forexconnect api vb6 use the using statement for this purpose:. This sample is a simple console application which uses ForexConnect. This application has the following features:. To simplify the sample, the whole application logic is implemented in one class MyApp.
You can download the whole source code of the sample: The main object of ForexConnect. This object represents a session of user's connection and can be created using a static method of the O2GTransport class:. The O2GSession object notifies subscribers of all changes of the connection state through the following events:. The data receiving notifications can be handled using the following O2GSession events:.
For this, we use a special synchronization signal. WaitOne in the run forexconnect api vb6. To receive notifications of forexconnect api vb6 responses or server objects state changes, you must implement and subscribe event handlers forexconnect api vb6 the appropriate events of the O2G2Session instance. Depending on settings of the trade server, the current prices of all instruments either can be automatically received during the login process, or you can explicitly request this data from the trade server.
So, to get the current prices you should do the following actions:. To request the current prices, add the following source code to the run forexconnect api vb6 of our sample after login processing:. In the forexconnect api vb6, we wait for receiving the request response using a synchronization signal. Of course, we should set this signal when price data is received.
In our sample a "trick" is used to avoid code duplication. As you will forexconnect api vb6 further, response processing is the same when offers data is received from the O2GLoginRules object and when we explicitly retrieve offers data. So to process the response object received from O2GLoginRulesyou can directly call the implemented event handler of the RequestCompleted event of the session object.
As a call of sendRequest is asynchronous, to receive a response with price data, you need to implement the event handler for RequestCompleted event of session object. As this event handler is used to receive notifications of responses of all requests, you should do the following:. See the source code below for a sample of how to handle receiving of a response. A synchronization signal is set when receiving of offers data is completed. This "trick" allows waiting for receiving the current prices in the main thread after sending the request.
Note that the notification is received in a separate thread, therefore you must use thread-safe reading and updating of the variables that store the received data. We have implemented forexconnect api vb6 methods to access these variables. As we need an Account ID for our sample, let's retrieve the Accounts table at first. Retrieving data of the Accounts table is similar to retrieving data of the Offers table.
To simplify the sample, get the first account from the user account list and store it in a class-level variable for further usage. The best practice is encapsulation of the forexconnect api vb6 creation logic into a separate method of the MyApp class.
Also you should handle the response to the order creation request in the onRequestCompleted event handler to make sure that the order is created. Note that there are some useful helper classes in the fxcore2. Forexconnect api vb6 namespace for filling the valueMap object with order parameters:. So you need to do the following:. To simplify our sample, we take the stored account ID and use it in the example of the Orders table retrieving.
Note that if you store orders data, you must provide thread-safe access to this data and correct management of reference counters for the stored objects. In our sample, orders data is not stored, so synchronization is not implemented. As you can see, the stop method of our MyApp class frees all used system resources and unsubscribes all event handlers from session events to stop receiving notifications.
You should call logout before termination of your application. When an error occurs during asynchronous execution of a request, the event handler of the RequestFailed event is invoked. In our sample, we handle the error by putting the error description in the console output and by stopping the application:.
To launch the sample on this stage, we need to implement usage of our MyApp class. For this, do the following:. The run method of the sample prepares the application for trading. After the preparation is made, it returns true if all is good. As you can see, this method calls all API functions asynchronously but waits for their responses forexconnect api vb6 special synchronization objects.
Note that this is not an effective method of using ForexConnectAPI, but it is easy for understanding. Now you can build and run the sample. If you have any problem with building the sample, please compare it with forexconnect api vb6 whole source forexconnect api vb6 of the sample: How to Start Using ForexConnect. Generic ; using System. Text ; using System. Read ; if app.
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