How do I get the date from the PBForms Calendar Control?

[StanHelton]

Okay, I'm sure this sounds like a beginner question, but when I run into problems it's always something that looks very easy AFTER I know the answer.

CALLBACK FUNCTION ShowCalendarProc()
   LOCAL DataStructure AS SYSTEMTIME
   LOCAL pst AS SYSTEMTIME POINTER

   CalendarHandle = CBHNDL
   pst = VARPTR(DataStructure)

   SELECT CASE AS LONG CBMSG
      CASE %WM_INITDIALOG
         ' Initialization handler

      CASE %WM_NCACTIVATE
         STATIC hWndSaveFocus AS DWORD
         IF ISFALSE CBWPARAM THEN
            ' Save control focus
            hWndSaveFocus = GetFocus()
         ELSEIF hWndSaveFocus THEN
            ' Restore control focus
            SetFocus(hWndSaveFocus)
            hWndSaveFocus = 0
         END IF

      CASE %WM_COMMAND
         ' Process control notifications
         MonthCal_GetCurSel(CalendarHandle, pst)
         MailingDate = TRIM$(STR$(DateStructure.wMonth)) & "/" _
                       & TRIM$(STR$(DateStructure.wDay)) & "/" _
                       & TRIM$(STR$(DateStructure.wYear))

   END SELECT
END FUNCTION

According to the debug watch, DataStructure doesn't get initialized.

I've tried using "@pst." in place of "DataStructure." but the debug watch shows the value of the pointer (not the variable) in wMonth, wDay, and wYear.

I don't really care which message is being processed. If anything happens in the calendar window I want to update the GLOBAL MailingDate.

Thank you for looking at this for me.
Stan

[Roy Cline]

http://www.powerbasic.com/support/pbforums/showthread.php?t=35617&highlight=calendar+control

[Chris Holbrook]

BYVAL pst?

Anyroad, this works, not sure if it answers your question though!

#PBFORMS CREATED V1.51
#COMPILE EXE
#DIM ALL

#PBFORMS BEGIN INCLUDES
#IF NOT %DEF(%WINAPI)
    #INCLUDE "WIN32API.INC"
#ENDIF
#IF NOT %DEF(%COMMCTRL_INC)
    #INCLUDE "COMMCTRL.INC"
#ENDIF
#INCLUDE "PBForms.INC"
#PBFORMS END INCLUDES

#PBFORMS BEGIN CONSTANTS
%IDD_DIALOG1         =  101
%IDC_SYSMONTHCAL32_1 = 1001
%IDC_LABEL1          = 1002
#PBFORMS END CONSTANTS

DECLARE CALLBACK FUNCTION ShowDIALOG1Proc()
DECLARE FUNCTION ShowDIALOG1(BYVAL hParent AS DWORD) AS LONG
#PBFORMS DECLARATIONS

FUNCTION PBMAIN()
    PBFormsInitComCtls (%ICC_WIN95_CLASSES OR %ICC_DATE_CLASSES OR %ICC_INTERNET_CLASSES)

    ShowDIALOG1 %HWND_DESKTOP
END FUNCTION

CALLBACK FUNCTION ShowDIALOG1Proc()
  LOCAL DataStructure AS SYSTEMTIME

    SELECT CASE AS LONG CBMSG

        CASE %WM_notify
            MonthCal_GetCurSel(getdlgitem(CBHNDL, %IDC_SYSMONTHCAL32_1), BYREF DataStructure)
            CONTROL SET TEXT CBHNDL, %IDC_LABEL1, _
                 TRIM$(STR$(DataStructure.wMonth)) & "/" _
               & TRIM$(STR$(DataStructure.wDay)) & "/" _
               & TRIM$(STR$(DataStructure.wYear))

    END SELECT
END FUNCTION

FUNCTION ShowDIALOG1(BYVAL hParent AS DWORD) AS LONG
    LOCAL lRslt AS LONG

#PBFORMS BEGIN DIALOG %IDD_DIALOG1->->
    LOCAL hDlg  AS DWORD

    DIALOG NEW hParent, "Stan Helton's Calendar Problem", 70, 70, 265, 162, %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 "SysMonthCal32", hDlg, %IDC_SYSMONTHCAL32_1, "SysMonthCal32_1", 5, 5, 120, 75, %WS_CHILD OR %WS_VISIBLE OR _
        %WS_TABSTOP, %WS_EX_LEFT OR %WS_EX_LTRREADING OR %WS_EX_RIGHTSCROLLBAR OR %WS_EX_CLIENTEDGE
    CONTROL ADD LABEL,  hDlg, %IDC_LABEL1, "Label1", 140, 75, 110, 65
#PBFORMS END DIALOG

    DIALOG SHOW MODAL hDlg, CALL ShowDIALOG1Proc TO lRslt

#PBFORMS BEGIN CLEANUP %IDD_DIALOG1
#PBFORMS END CLEANUP

    FUNCTION = lRslt
END FUNCTION

[Adam J. Drake]

No need to use pst. Just send DataStructure.

In both the MACRO and FUNCTION definition of MonthCal_GetCurSel inside COMMCTRL.INC, it takes care of sending the variable declared as SYSTEMTIME as a pointer by using VARPTR.

[StanHelton]

Thanks to all 3 of you.

Roy Cline: Yes, I like Bjorge's calendar routine, but it would not compile in my application.

Chris Holbrook: Thank you for that code. It compiles and does exactly what I need it to do right up until I try to integrate it into my application.

Adam J. Drake: Thank you for reminding me about how MACROs work. I was beginning to focus on this problem too much.

In general:

Thank you all for your input. Based on what you have given me, I have decided the problem must lie somewhere else in my code. The application is too big to post, but at least I know the calendar function is right.

Sincerely grateful,
Stan