Microsoft KB Archive/140296

= How to Use a KeyPress Event in Lieu of ON KEY LABEL =

Article ID: 140296

Article Last Modified on 8/17/1999

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APPLIES TO


 * Microsoft Visual FoxPro 3.0 Standard Edition

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This article was previously published under Q140296



SUMMARY
Many developers use ON KEY LABEL to assign programs or procedures within programs that are to be executed upon pressing a specific key (usually a function key). However, if the ON KEY LABEL assignment is to be specific to a control within a form, a better alternative would be to use the KeyPress event of that control.



MORE INFORMATION
The KeyPress event is available for the following form controls:

CheckBox, ComboBox, CommandButton, EditBox, Form, ListBox, OptionButton, Spinner, TextBox

It is possible to use this event to check for the press of a specific key. When using the KeyPress event to perform an action based on a function key, the function key's value should be used as shown in this table:   Key     Alone   Shift    Ctrl    Alt F1       28      84      94     104 F2       -1      85      95     105 F3       -2      86      96     106 F4       -3      87      97     107 F5       -4      88      98     108 F6       -5      89      99     109 F7       -6      90     100     110 F8       -7      91     101     111 F9       -8      92     102     112 F10      -9      93     103     113 F11     133     135     137     139 F12     134     136     138     140 For more information on key values, refer to the INKEY function in Visual FoxPro Help file.

Step-by-Step Example
The following steps show how to use the KeyPress event.

 Create a form, and place a text box on it. In the ControlSource property of the text box, type mykey (or any other variable that you might prefer).  Place the following code in the KeyPress event of the text box: LPARAMETERS nKeyCode, nShiftAltCtrl *: The previous line of code is already contained in the KeyPress event *: by default. DO CASE

CASE nKeyCode = 28 WAIT WINDOW "The F1 Key has been pressed" NOWAIT mykey = "F1 Key" ThisForm.Refresh

CASE nKeyCode = -4 WAIT WINDOW "The F5 Key has been pressed" NOWAIT mykey = "F5 Key" ThisForm.Refresh

ENDCASE   Place the following code in the Load event of the form: CLEAR MACROS SET HELP OFF *: This will disable FoxPro's default function key assignments.   Place the following code in the Destroy event of the form: RESTORE MACROS SET HELP ON  *: This will restore FoxPro's default function key assignments.   Place a command button on the form, and place the following code in its click event: ThisForm.Release </li> Save and run the form. If either the F1 or F5 key is pressed, the appropriate WAIT WINDOW messages should appear, and the text box should be updated.</li></ol>

Additional query words: VFoxWin

Keywords: kbcode KB140296

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