回复： How do I send keyboard combinations programatically

[Nando88]

I currently have a labview applications that sends commands to a third party application, so I can control it through labview. The problem I am having, is that I need to send a key combination (ctrl+shift+r), but I am unable to do this through labview.

I found a post that has a discussion about how to do this, but I can't get their code to work, based on my needs.

This is the website I found, that has this code.

https://forums.ni.com/t5/LabVIEW/programmatic-keyboard-events/td-p/887997?profile.language=es

[JICR]

Maybe you should give your 3rd party the keyboard focus?

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019N3tSAE&l=en-CA

[Nando88]

I am already doing that, beore sending the keyboard commands.

please see the picture, to see the code that I am using.

Thanks for responding.

[JICR]

Oh yeah I see of course.

Did you try adding a 100 ms delay after you setforegroundwindow ? Then press/hold CTRL+SHIFT+R.

[MichaelBalzer]

If the three key presses are being sent simultaneously, there's no guarantee you're sending CTRL + SHIFT + R. Modifier keys generally have to be pressed before pressing the letter. Instead try sequencing the CTRL, SHIFT and R key presses (in that order). You might also try setting the two modifier keys first (CTRL + SHIFT), wait maybe 50ms, then send the R key.

[weschen]

Be careful of the key order when pressed the combine key(CTRL+SHIFT+R).

[wiebe@CARYA]

Not sure how that subVI works (probably SendKeys functions). If you'd use SendMessage, you can send a WM_KEYDOWN and WM_KEYUP (maybe WM_SYSKEYDOWN\UP) messages. Benefit would be that the application doesn't need to have focus.

[weschen]

I agreed is better used the windows API function; If pressed combine keypad,maybe you can refer the attchment.