shortcut modifier Alt

[lvrat]

How to use shortcut modifier as ALT key with CVI 9.0? Is there any direct way than using windows functions?

[Wolfgang]

VAL_UNDERLINE_MODIFIER	The <Alt> key.
VAL_SHIFT_MODIFIER	The <Shift> key.
VAL_MENUKEY_MODIFIER	The <Ctrl> key.
VAL_SHIFT_AND_MENUKEY	Both the <Shift> key and the <Ctrl> key.

[lvrat]

I suppose that can be used with EVENT_KEYPRESS but how should it be provided in button. On edit the modifier drop down does not has an option for ALT? 

[RobertoBozzolo]

This is because the ALT key is automatically assigned to letters prepended by double underscores in the control labels.

That is, if you write a lable '__Stop' it will be written as 'Stop' in the control and it will be automatically operated by pressing Alt+S.

[lvrat]

I have buttons from 0 to 3 on GUI for which ALT_<bttn number> is used and it selects the button. How can a particular button on GUI from 0 to 3 be selected by simply pressing numbers on the keypad, say when  0 pressed then  0 button on GUI will be selected. Looks like on one of the machines this is happening but not on another machine. Puzzled as to what is happening here. TIA. 

[Perry_S]

Hi Lvrat,

The only way to accomplish what you want is to use the EVENT_KEYPRESS. You cannot cut the ALT part of the function out in any other way.

Perry S.

[RobertoBozzolo · Accepted solution]

A possible alternative is to assign a hotkey using windows SDK APIs and process system events: the attached sample does this job assigning hotkeys to both keyboard and numeric keypad keys; the sample discriminates the key pressed and fires the corresponding button callback (by the way, button 0 is only activated by alt+keyboard '0', numeric keypad does not trigger the button).

You will need to be careful when to activate hotkeys, though, to discriminate when pressing '0' is used to fire a button or is simply a regular input by the user with no other special meaning.