LabWindows/CVI Idea Exchange

Include a function to programmatically re-start the NI Variable Engine if it is found to be stopped.

Although the NV libraries include a function to detect whether the NI Varible Engine service is running, there is no function included in the library to facilitate re-starting the NI Variable Engine service. 

For those The method that I am aware of to restart this service is to use the ANSI C system() function with an embedded command line:

Index = 0;                                           

CNVVariableEngineIsRunning(&running);

while((!running) && (index++ < 5))

{

System(“net start \"NI Variable Engine\"");

                Delay(0.1);

                CNVVariableEngineIsRunning(&running);

}

if(!running) return -1;

Learning this required some time spent on the web, looking through old posts on how to solve the same problem in LabView.  Rather than spending that time, it would have been more productive to just pull it out of the library.

IPv6 is becoming more ubiquitous each year.  More and more the US government is requiring it for defense designs.  Microsoft has supported it in Visual Studio since 2008.  Even Agilent Vee supports it. It should strongly be considered for both LabWindows CVI and Labview.  There are workarounds using dlls, but a company like NI shouldn't expect users to have to do that.  I am off to start my workaround.  Please give this not so new idea some serious consideration.  Thanks.

I know we used to have this web server feature 6-7 years ago.

I would request a function where we can export designated panel which user can control from web. Also provides an option to have read only or read/write access. Also password options.

Something like this.

ExportPanelToWebServer (panelHandle, READ_ONLY_FLAG, PASSWORD_FLAG, PASSWORD);

//This starts web server automatically and ready for connection on port 80.

This opens door to lots of applications which requires web control. I think LabVIEW has similar feature. (Web publishing tool)

It seems to me that it would be really neat if CVI were able to support publishing/acceptance of XML data in the format required by LabVIEW UI Builder. The idea of LabVIEW UI Builder thin clients with a CVI server is quite appealing.

+ Implement Modbus RTU master/TCP client protocol support in CVI

In previous applications, we would talk to our product using a telnet session.
CVI has libraries to do this, such as...

ConnectToTCPServer ((unsigned int *)&g_ShelfHandle[iSocketNumber], 23, sAddress, com_ClientTCPCB, NULL, 0);                                                                   

In one of our new products, it only supports "ssh" which is similar to telnet, but is a "secured shell" connection.
One option is to use putty:  http://digital.ni.com/public.nsf/allkb/C49602A79827DDBE86256CE9005757D5?OpenDocument

It is not the most straightforward way of doing things, but at the moment, it is what we have to deal with.

 
Since the ssh protocol is becoming the new standard in communications (used in all Linux machines, and windows), and most
of the new telnet programs (supporting ssh), I would like to request that a CVI library be created to support this protocol.

This issue has been explained in this thread.

As explained in some documents on the NI web site

• Using a LabWindows/CVI Program as an OPC Server Through the NI Network Variable Engine
• OPC Server development with Shared Variables and overcoming DCOM issues

the Network Variable Library can be used to develop an OPC Server (and a Client too).

While developing an OPC Client, the function CNVGetDataQuality( ) can be used to read the data quality, but there isn't a way to set this parameters while developing an OPC Server.

For this reason a way to set the data quality status and substatus should be added to the Network Variable Library functions that generate OPC data.

I suggest these new prototypes:

• CNVSetScalarDataValue (data, type, value, quality)

• CNVSetArrayDataValue (data, type, &array, NofDims, dims[], quality)
• ...

Hi,

Due to more and more applications using ipv6 as the network communication address, e.g. in the internet of things application,  and in many SCADA field , there also need the asynchronous connect by socket, so hope  CVI developers can provide these support.

David

Please consider the possibility to enable the use of CVI application as web server so that the application will accessible to the web.

Its open one new world (wide  web..).

Consider the opportunity to ope to all smartphone device....