Announcement

**Houng Chang** · 23 Jul 2009, 12:46 PM

By using Control Get Text, the program is working. But I set hDlg as global.

#COMPILER PBWIN 9
#COMPILE EXE
#DIM ALL

'------------------------------------------------------------------------------
' Include files
'------------------------------------------------------------------------------
%USEMACROS = 1

#INCLUDE "Win32API.inc"
#INCLUDE "CommCtrl.inc"
#INCLUDE "InitCtrl.inc"

GlobAL hDlg AS DWORD

'------------------------------------------------------------------------------
' Equates
'------------------------------------------------------------------------------
%IDC_LABEL = %WM_USER + 2110
%IDC_CALDATE1 = %WM_USER + 2150
%IDC_CALDATE2 = %WM_USER + 2170
''%IDC_CALTIME = %WM_USER + 2151

'------------------------------------------------------------------------------
' Main callback
'------------------------------------------------------------------------------
CALLBACK FUNCTION DlgProc () AS LONG

LOCAL pNMDTC AS NMDATETIMECHANGE PTR
LOCAL szDate1 AS ASCIIZ * 64
LOCAL szDate2 AS ASCIIZ * 64
'' LOCAL szTime AS ASCIIZ * 64

SELECT CASE CB.MSG

CASE %WM_COMMAND
' User selected CLOSE button
IF CB.CTL = %IDCANCEL THEN DIALOG END CB.HNDL

CASE %WM_NOTIFY 'Use this to detect changes in the calendar
' Set up the NMDATETIMECHANGE pointer passed in CB.LPARAM
pNMDTC = CB.LPARAM

IF @pNMDTC.hdr.code = %DTN_DATETIMECHANGE THEN 'Get selected date/time
' Here we use API messages to format a system local date/time text,
' but we can also use CONTROL GET TEXT to get the text directly, or
' format individual members of the @hdrX.st SYSTEMTIME structure directly.

CONTROL GET TEXT hDlg ,%IDC_CALDATE1 to szDate1
CONTROL GET TEXT hDlg ,%IDC_CALDATE2 to szDate2

' GetDateFormat %LOCALE_USER_DEFAULT, %DATE_LONGDATE, _
' @pNMDTC.st, BYVAL %NULL, szDate1, SIZEOF(szDate1)

' GetDateFormat %LOCALE_USER_DEFAULT, %DATE_LONGDATE, _
' @pNMDTC.st, BYVAL %NULL, szDate2, SIZEOF(szDate2)

' ? szDate1
' ? szDate2

'' GetTimeFormat %LOCALE_USER_DEFAULT, %TIME_FORCE24HOURFORMAT, _
'' @pNMDTC.st, BYVAL %NULL, szTime, SIZEOF(szTime)

CONTROL SET TEXT CB.HNDL, %IDC_LABEL, _
"Selected date1: " + szDate1 + $CR + "Selected date2: " + szDate2
END IF

CASE %WM_SYSCOLORCHANGE, %WM_WININICHANGE
' If user changes color scheme, forward the notification to the Ani control
CONTROL SEND CB.HNDL, %IDC_CALDATE1, CB.MSG, CB.WPARAM, CB.LPARAM
CONTROL SEND CB.HNDL, %IDC_CALDATE2, CB.MSG, CB.WPARAM, CB.LPARAM

END SELECT

END FUNCTION

'------------------------------------------------------------------------------
' Main entry point for the application
'------------------------------------------------------------------------------
FUNCTION PBMAIN () AS LONG

' LOCAL hDlg AS DWORD
'---------------------------------------------------------------------------
' Note: SysMonthCal32 requires COMCTL32.DLL v4.70 (MSIE 3.0) or latter.
' Therefore, we must check the version number of COMCTL32, so we'll use the
' return value from the helper function InitComCtl32() for this.
'---------------------------------------------------------------------------
IF InitComCtl32(%ICC_DATE_CLASSES) < [email protected] THEN
MSGBOX "Sorry, this program needs a later version of COMCTL32.DLL." + $CRLF _
+ "Please install MSIE version 3 or higher, or get the file directly from: " + $CRLF _
+ $CRLF _
+ "http://www.microsoft.com/msdownload/ieplatform/ie/comctrlx86.asp", _
%MB_ICONWARNING OR %MB_SYSTEMMODAL, "SysMonthCal32 Error"
EXIT FUNCTION
END IF

'--------------------------------------------------------------------------
DIALOG NEW 0, "DateTime picker demo", 194, 109, 309, 70, %WS_CAPTION OR %WS_SYSMENU OR %WS_VISIBLE OR _
%DS_3DLOOK OR %DS_NOFAILCREATE OR %DS_SETFONT, %WS_EX_LEFT OR %WS_EX_LTRREADING OR %WS_EX_RIGHTSCROLLBAR OR _
%WS_EX_CONTROLPARENT, TO hDlg

CONTROL ADD LABEL, hDlg, %IDC_LABEL, "Select a date1 and/or date2.", 6, 30, 194, 20

CONTROL ADD BUTTON, hDlg, %IDCANCEL, "&Close", 150, 52, 50, 14

CONTROL ADD "SysDateTimePick32", hDlg, %IDC_CALDATE1, "", 5, 5, 134, 14, %WS_CHILD OR %WS_TABSTOP OR %WS_VISIBLE OR _
%DTS_LONGDATEFORMAT, %WS_EX_LEFT OR %WS_EX_LTRREADING OR %WS_EX_RIGHTSCROLLBAR OR %WS_EX_CLIENTEDGE

CONTROL ADD "SysDateTimePick32", hDlg, %IDC_CALDATE2, "", 140,5, 134, 14, %WS_CHILD OR %WS_TABSTOP OR %WS_VISIBLE OR _
%DTS_LONGDATEFORMAT, %WS_EX_LEFT OR %WS_EX_LTRREADING OR %WS_EX_RIGHTSCROLLBAR OR %WS_EX_CLIENTEDGE

' CONTROL ADD "SysDateTimePick32", hDlg, %IDC_CALTIME, "", 140, 5, 63, 14, %WS_CHILD OR %WS_TABSTOP OR %WS_VISIBLE OR _
' %DTS_UPDOWN OR %DTS_TIMEFORMAT, %WS_EX_LEFT OR %WS_EX_LTRREADING OR %WS_EX_RIGHTSCROLLBAR OR %WS_EX_CLIENTEDGE

'--------------------------------------------------------------------------
DIALOG SHOW MODAL hDlg CALL DlgProc

END FUNCTION

HYC

**Christopher Carroll** · 24 Jul 2009, 03:21 PM

Suggest you post questions in another sub-forum, such as 'PowerBASIC for Windows' or 'Programming' as this one is for source code listings.

However...

In a DDT callback function, CB.HNDL is the handle of the dialog, so there is no need to call

Code:

CONTROL GET TEXT hDlg ,%IDC_CALDATE1 to szDate1
CONTROL GET TEXT hDlg ,%IDC_CALDATE2 to szDate2

but use this instead

Code:

CONTROL GET TEXT CB.HNDL, %IDC_CALDATE1 to szDate1
CONTROL GET TEXT CB.HNDL, %IDC_CALDATE2 to szDate2

In the example program, there are two DATETIME controls, with one formatted as a date (%IDC_CALDATE), and the other as a time control (%IDC_CALTIME). The code under the %DTN_DATETIMECHANGE notification 'works' in this instance as the notification is called when any of these two controls is changed.

It is buggy, though, as the code does not match the expected behaviour.

To demonstrate this, change the date, then change the time.

When the date is changed, the label will show the changed date, and the existing time.
When the time is changed after the date has been changed, the label will show today's date (not the existing date) and the changed time. [And the date in the date control will be different than that displayed in the label as the 'selected date'.]

This is because GetDateFormat is called before GetTimeFormat in the notification that is called for any change in either of these controls. When the time is changed, GetDateFormat will get the date of the time control, and as that has not been set specifically, it will return today's date.

To solve this, and also to answer your question, %DTN_DATETIMECHANGE should be handled separately for each control.

The following demonstrates:

Code:

Local ptNmdtc As NMDATETIMECHANGE Ptr
Local ptNmh As NMHDR Ptr
Local szDate As Asciiz * 64

Case %WM_NOTIFY
    ptNmh = Cb.lParam
    Select Case @ptNmh.idFrom
        Case %IDC_CALDATE1
            Select Case @ptNmh.code
                Case %DTN_DATETIMECHANGE
                    ptNmdtc = Cb.lParam
                    GetDateFormat %LOCALE_USER_DEFAULT, %DATE_LONGDATE, @ptNmdtc.st, ByVal %NULL, szDate, SizeOf(szDate)
                    Control Set Text Cb.Hndl, %IDC_LABEL, "Date 1 changed to: " + szDate
            End Select
        Case %IDC_CALDATE2
            Select Case @ptNmh.code
                Case %DTN_DATETIMECHANGE
                    ptNmdtc = Cb.lParam
                    GetDateFormat %LOCALE_USER_DEFAULT, %DATE_LONGDATE, @ptNmdtc.st, ByVal %NULL, szDate, SizeOf(szDate)
                    Control Set Text Cb.Hndl, %IDC_LABEL, "Date 2 changed to: " + szDate
            End Select
    End Select

If you want to show the value of both dates at the same time, this is one way to do so:

Code:

Local ptNmdtc As NMDATETIMECHANGE Ptr
Local ptNmh As NMHDR Ptr
Local tST As SYSTEMTIME
Static sszDate1 As Asciiz * 64
Static sszDate2 As Asciiz * 64

Case %WM_INITDIALOG
    ' record initial values of dates
    ' .. date 1
    SendMessage GetDlgItem(Cb.Hndl, %IDC_CALDATE1), %DTM_GETSYSTEMTIME, 0, VarPtr(tST)
    GetDateFormat %LOCALE_USER_DEFAULT, %DATE_LONGDATE, tST, ByVal %NULL, sszDate1, SizeOf(sszDate1)
    ' .. date 2
    SendMessage GetDlgItem(Cb.Hndl, %IDC_CALDATE2), %DTM_GETSYSTEMTIME, 0, VarPtr(tST)
    GetDateFormat %LOCALE_USER_DEFAULT, %DATE_LONGDATE, tST, ByVal %NULL, sszDate2, SizeOf(sszDate2)
    Function = 1

Case %WM_NOTIFY
    ptNmh = Cb.lParam
    Select Case @ptNmh.idFrom
        Case %IDC_CALDATE1
            Select Case @ptNmh.code
                Case %DTN_DATETIMECHANGE
                    ptNmdtc = Cb.lParam
                    GetDateFormat %LOCALE_USER_DEFAULT, %DATE_LONGDATE, @ptNmdtc.st, ByVal %NULL, sszDate1, SizeOf(sszDate1)
                    Control Set Text Cb.Hndl, %IDC_LABEL, "Date 1 changed to: " + sszDate1 + $crlf + _
                        " and Date 2 remains as: " + sszDate2
            End Select
        Case %IDC_CALDATE2
            Select Case @ptNmh.code
                Case %DTN_DATETIMECHANGE
                    ptNmdtc = Cb.lParam
                    GetDateFormat %LOCALE_USER_DEFAULT, %DATE_LONGDATE, @ptNmdtc.st, ByVal %NULL, sszDate2, SizeOf(sszDate2)
                    Control Set Text Cb.Hndl, %IDC_LABEL, "Date 2 changed to: " + sszDate2 + $crlf + _
                        " and Date 1 remains as: " + sszDate1
            End Select
    End Select

**Houng Chang** · 25 Jul 2009, 01:03 PM

Mr. Carroll,
Thanks a lot.
HYC

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