How Can I create a DataPoint and add it to the current project using API?

[mohi65]

Hello everyone,

I'm a total WinCCOA newB.
I'm working on a custom manager using the C++ API. as a part of this application I should create a number of datapoints and add them to the current project.
Does anyone have an experience regarding this issue?
So if this is and old topic would please send me the thread's link? :S

Cheers,
Mohsen

[mohi65]

I managed to create the datapoint using Manager class! :cheer:
Still I need to figure out how to run another manager from my custom manager? :/

[leoknipp]

Hello,

it is very uncommon to start another WinCC OA process from an API process. Normally all necessary managers are started using the process monitor.
Which WinCC OA task do you want to start?

Best Regards
Leopold Knipp
Senior Support Specialist

[mohi65]

Hi,

Thank you for the reply!
I need to start a Control Manager from my custom API manager and feed it with an script.
So far the only way I could achieve it was through calling "WCCOActrl.exe" with proper arguments as a system command.
Actually I need to debug an script using the API manager and that's why I have to load it into a CTRL Manager.
Do you think there is a better alternative?

[mpoint]

Actually I need to debug an script using the API manager and that's why I have to load it into a CTRL Manager.

I don't think I understand this. What do you mean with "debug a script"? I think usually you would use the Ctrl Debugger in the GEDI for that.

Anyway, if you really want to start one manager from another, it should work like this (with slight changes depending on the Version):

Code: Select all

CharString manName = ComponentNames::getName(ComponentNames::CTRL_COMPONENT);
CharString manager = PVSSFileSys::fileExists(Resources::getProjBinDir, manName + ".exe");
manager += " -proj " + Resources::getProjectName();
// TODO: add other arguments, like the script name

Process proc;
proc.exec(manager);

Disclaimer: I didn't try this out, and obviously I left out the error handling and includes.

[mkoller]

I don't know what you want to solve, but you might think about other possibilities:
1.) do not implement an API manager at all but implement your special functionality as a CTRL extension (a C++ coded plug in for CTRL)
2.) If you really need an API manager but still want to execute scripts, you can also integrate the CTRL interpreter into your API manager