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Q253785: PRB: Error When Setting DateTimePicker Control Programmatically

Article: Q253785
Product(s): Microsoft FoxPro
Version(s): WINDOWS:6.0
Operating System(s): 
Keyword(s): kbActiveX kbCtrl kbvfp600 kbGrpDSFox kbDSupport
Last Modified: 23-FEB-2000

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The information in this article applies to:

- Microsoft Visual FoxPro for Windows, version 6.0 
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SYMPTOMS
========

When attempting to set the date of a DateTimePicker control programmatically,
the following error message might appear:

  OLE IDispatch exception code 0 from DTPicker: Invalid Property Value.

CAUSE
=====

When using the DateTimePicker control's Calendar interface to change the date,
the control handles adjusting the Day, Month, and Year properties to create a
valid date. If a value is assigned that creates an invalid date, the error
message above is displayed.

RESOLUTION
==========

Use the GOMONTH() function to return a valid date, which can then be used to set
the Day, Month, and Year properties of the DateTimePicker control as follows:

  olddate=exampledate
  exampledate=exampledate+(number_of_days_to_change)
  IF MONTH(exampledate)<>MONTH(olddate)
     olddate=GOMONTH(olddate,-1)
     THISFORM.DTPicker1.DAY=DAY(olddate)
     THISFORM.DTPicker1.MONTH=MONTH(olddate)
     THISFORM.DTPicker1.YEAR=YEAR(olddate)
  ENDIF

STATUS
======

This behavior is by design.

MORE INFORMATION
================

Steps to Reproduce Behavior
---------------------------

1. Create a program file named "DTP_DEMO" (without the quotation marks) using
  the following code:

  PUBLIC OX
  OX=CREATEOBJECT('MYFORM')
  OX.SHOW
  READ EVENTS

  DEFINE CLASS myform AS FORM
     CAPTION = "DateTimePicker Form"
     HEIGHT = 150
     LEFT = 0
     TOP = 0
     WIDTH = 230
     NAME = "myform"

     ADD OBJECT DTPicker1 AS OLECONTROL WITH ;
        OLECLASS="MSComCtl2.DTPicker.2",;
        TOP = 5, ;
        LEFT = 5, ;
        HEIGHT = 25, ;
        WIDTH = 100, ;
        NAME = "DTPicker1"

     ADD OBJECT commandbutton1 AS COMMANDBUTTON WITH ;
        TOP=45, ;
        LEFT=115, ;
        HEIGHT=25, ;
        AUTOSIZE=.T., ;
        CAPTION="Add One Day", ;
        NAME="commandbutton1"

     ADD OBJECT commandbutton2 AS COMMANDBUTTON WITH ;
        TOP=75, ;
        LEFT=115, ;
        HEIGHT=25, ;
        AUTOSIZE=.T., ;
        CAPTION="Subtract One Day", ;
        NAME="commandbutton2"

     ADD OBJECT commandbutton3 AS COMMANDBUTTON WITH ;
        TOP=125, ;
        LEFT=125, ;
        HEIGHT=25, ;
        CAPTION="\<Close", ;
        NAME="commandbutton3"

     PROCEDURE INIT
        PUBLIC exampledate
        exampledate=CTOD("02/01/00")
        THISFORM.DTPicker1.DAY=DAY(exampledate)
        THISFORM.DTPicker1.MONTH=MONTH(exampledate)
        THISFORM.DTPicker1.YEAR=YEAR(exampledate)
     ENDPROC

     PROCEDURE commandbutton1.CLICK
        olddate=exampledate
        exampledate=exampledate+1
  *!*	      IF MONTH(exampledate)<>MONTH(olddate)
  *!*	         olddate=GOMONTH(olddate,1)
  *!*	         THISFORM.DTPicker1.DAY=DAY(olddate)
  *!*	         THISFORM.DTPicker1.MONTH=MONTH(olddate)
  *!*	         THISFORM.DTPicker1.YEAR=YEAR(olddate)
  *!*	      ENDIF
        THISFORM.DTPicker1.DAY=DAY(exampledate)
        THISFORM.DTPicker1.MONTH=MONTH(exampledate)
        THISFORM.DTPicker1.YEAR=YEAR(exampledate)
     ENDPROC

     PROCEDURE commandbutton2.CLICK
        olddate=exampledate
        exampledate=exampledate-1
  *!*	      IF MONTH(exampledate)<>MONTH(olddate)
  *!*	         olddate=GOMONTH(olddate,-1)
  *!*	         THISFORM.DTPicker1.DAY=DAY(olddate)
  *!*	         THISFORM.DTPicker1.MONTH=MONTH(olddate)
  *!*	         THISFORM.DTPicker1.YEAR=YEAR(olddate)
  *!*	      ENDIF
        THISFORM.DTPicker1.DAY=DAY(exampledate)
        THISFORM.DTPicker1.MONTH=MONTH(exampledate)
        THISFORM.DTPicker1.YEAR=YEAR(exampledate)
     ENDPROC

     PROCEDURE commandbutton3.CLICK
        RELEASE THISFORM
     ENDPROC

     PROCEDURE UNLOAD
        CLEAR EVENTS
     ENDPROC

  ENDDEFINE

2. Save and run DTP_DEMO.

3. Click the Command button captioned Subtract One Day, and note the error
  message that appears.

4. Uncomment the commented lines of code in the commandbutton1.click and
  commandbutton2.click methods.

5. Save and run DTP_DEMO.

6. Click the Command button captioned Subtract One Day, and note that the error
  message does not appear.

(c) Microsoft Corporation 2000, All Rights Reserved. Contributions by John Desch,
Microsoft Corporation.


REFERENCES
==========

For additional information DTPicker ActiveX Control, click the article number
below to view the article in the Microsoft Knowledge Base:

  Q189991 PRB: Error Setting DateTimePicker's Month Programmatically

Additional query words:

======================================================================
Keywords          : kbActiveX kbCtrl kbvfp600 kbGrpDSFox kbDSupport 
Technology        : kbVFPsearch kbAudDeveloper kbVFP600
Version           : WINDOWS:6.0
Issue type        : kbprb

=============================================================================

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