BUG: Incorrect Return Value with CAPSLOCK() or NUMLOCK()

• Microsoft FoxPro for MS-DOS, versions 2.0, 2.5x, 2.6

SYMPTOMS

The logical result of an operation involving the NUMLOCK() and CAPSLOCK() functions incorrectly returns a FALSE value when either function is used with the logical expression operator and the second expression returns TRUE.

RESOLUTION

To work around this behavior, you must use a nested IF statement if you are going to use the result of either NUMLOCK() or CAPSLOCK() in conjunction with another logical expression.

For example, the following code will correctly display the WAIT window message:

   ***Begin Code example of solution***
      * ensure the NUMLOCK key is on
      STORE .T. to istrue
      IF NUMLOCK()
         IF istrue
            WAIT WINDOW 'they are both true'
         ENDIF
      ENDIF
   ***End code example***

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce Behavior

To reproduce the incorrect behavior, use the following code example:

   ***Begin code example***
      * ensure the NUMLOCK key is on
      STORE .T. to istrue
      IF NUMLOCK() AND istrue
         WAIT WINDOW 'they are both true'
      ENDIF
   ***End of code example***