Developing the Code After placing controls on the form, you need to write Visual Basic code to respond to events. In other words, clients maintain a session during communication with the server. DataSocket Transfer Protocol dstp is a convenient mechanism to monitor the most recent values of measurement data distributed over the Internet. When the DataSocket control is updated with new data, the graph plots it. In binary compatibility mode, Visual Basic does not change the globally unique identifier GUID every time you make the. The prefix is called the URL scheme.
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Subscribers who have an interest labvjew the published data can subscribe to receive the data from the server. In the DSReader component, you want the DataSocket control to connect to the DataSocket Server and automatically read and update the data when the user clicks the Connect button.
DataSocket Transfer Protocol (dstp) Overview – National Instruments
Rate this document Select a Rating 1 – Poor 2 3 4 5 – Excellent. Double click the DataSocket control, and add the following code: After making the ActiveX control, you insert it into a Web page.
However, no data is being plotted on labvieew DSReader graph because there is no data being datassocket. Refer to the Appendix for information about viewing the Web page from networked computers or over the Internet. To dynamically create the wave item on the DataSocket Server from a remote machine, open the DataSocket Server Manager and modify the Creators permission group to include the remote machine.
DataSocket VI and Functions
Imagine a lab with 30 student workstations, a server for the lab, and a computer that acquires measurements and performs analysis on the measured data. You could embellish the student lab scenario by developing datasocet DSWriter component. To develop the event procedure for an ActiveX control in Visual Basic, double click the control to open the code editor, which automatically generates a default event procedure for the control.
Developing the Code After placing controls on the form, you need to write Visual Basic code to respond to events. Like URLs you use in a Web browser, the data source locator can point to different types of data sources depending on the prefix.
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You can download all of these tools free from the Web. When the DataSocket control is updated with new data, the graph plots it.
Double click the Connect button, and add the following code: DataSocket provides a unified API for these low-level communication protocols. The message also includes the URL of the requested data from the server.
During the session the server keeps track of client-connection information. To modify the scale on the knob, right click on the knob, select Propertiesand change Minimum to 1 on the Numeric page. To place controls on the control form, select the icon from the toolbox and click and drag on the form to draw the control. To request data from the server, a client sends a message that requests the most recent value of the data. Use the following steps to develop the DSReader interface.
To develop the DataSocket client Web page, you create a DataSocket reader component with which users connect to the server, automatically read and display the data, and disconnect from the server. You should replace the existing file. Add the bolded code to the following event procedure, which you created earlier in the example. There are three files associated with the Visual Basic project: With a DSWriter Web page, the professor or students could perform an acquisition from a remote site.
Place a DataSocket control on the form. You then use that Web page to read, write, or share data with other applications across the Internet. To display the connection status whether DataSocket is connected or unconnected in the Status field, double click the DataSocket control, select OnStatusUpdated from the event list in the code window, and add the following code to the OnStatusUpdated event: As the Wizard prompts you for information, keep the following things in mind: