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  • #1

    SDK equivalent for CONTROL ENABLE/DISABLE

    I searched a while in the forums but did not find anything.

    CONTROL ENABLE hDlg, id&
    and
    CONTROL DISABLE hDlg, id&
    work great for DDT.

    I am trying to do the equivalent for SDK.
    I found the following can enable and disable text boxes (EDITTEXT):
    SendDlgItemMessage hDlg, id&, %WM_ENABLE, 0, 0
    and
    SendDlgItemMessage hDlg, id& %WM_ENABLE, 1, 0

    but is not working for a CONTROL with the attribute BS_AUTOCHECKBOX.

    Any suggestions?
    Gary Peek, Industrologic, Inc.
    Tags: None
  • #2
    EnableWindow

    kgpsoftware.com | Slam DBMS | PrpT Control | Other Downloads | Contact Me

    Comment

    • #3
      To be clear:

      EnableWindow( GetDlgItem( cbhndl, %ID.. ), 0 )

      Or 1 to enable
      hellobasic

      Comment

      • #4
        "cbhndl" however is a DDT thing. How does one specify the control within the window in SDK style? (If that's the only way to do it, I believe you, and thank you, but it seems there should be an SDK method.
        )
        Gary Peek, Industrologic, Inc.

        Comment

        • #5
          Just use the handle of the control for the 1st param, and %TRUE/%FALSE for the 2nd...

          Code:
          EnableWindow

The EnableWindow function enables or disables mouse and keyboard input to the specified window or 
control. When input is disabled, the window does not receive input such as mouse clicks and key 
presses. When input is enabled, the window receives all input. 

BOOL EnableWindow
(
  HWND hWnd,     // handle to window
  BOOL bEnable   // flag for enabling or disabling input
);
 
Parameters
hWnd      Handle to the window to be enabled or disabled. 
bEnable   Specifies whether to enable or disable the window. If this parameter is TRUE, the window is 
             enabled. If the parameter is FALSE, the window is disabled.
 
Return Values

If the window was previously disabled, the return value is nonzero.  If the window was not previously 
disabled, the return value is zero. To get extended error information, callGetLastError.
          Fred
          "fharris"+Chr$(64)+"evenlink"+Chr$(46)+"com"

          Comment

          • #6
            >If that's the only way to do it
            it is..

            Sending the message is a no-no, since Windows will send this message when you use this api.
            It's a response by Windows.
            hellobasic

            Comment

            • #7
              Also, at...

              Bit Field Variable Attached To Check Boxes, And WM_CTLCOLORSTATIC - PowerBASIC Peer Support Community
              http://www.powerbasic.com/support/pbforums/showthread.php?t=36717
              PowerBASIC and related source code. Please do not post questions or discussions, just source code.


              is a fun little program that ties about 20 check boxes to a bit field variable and shows the status (checked/unchecked) and numeric value of variable in an output window simultaneously. When the output window is open it EnableWindow(hButton, %FALSE) 's the button that created the output window so you can only create one output window. If you are just getting into SDK style maybe it'll help.

              Also, here is another program that uses EnableWindow()

              Code:
              #Compile           Exe
#Dim               All
#Include           "Win32api.inc"
%IDC_BUTTON1       =  2000
%IDC_BUTTON2       =  2005
%IDC_BUTTON3       =  2010


Type WndEventArgs
  wParam           As Long          'Package parameters to Window Procedure in TYPE
  lParam           As Long
  hWnd             As Dword
  hInst            As Dword
End Type


Function fnForm1_WndProc(Byval hWnd As Long,Byval wMsg As Long,Byval wParam As Long,Byval lParam As Long) As Long
  Select Case As Long wMsg
    Case %WM_CREATE
       Local lpCreateStruct As CREATESTRUCT Ptr          'Window Procedure For Form1.  Form1 Disables
       Local ptrMain As Dword Ptr                        'THe Main Window here in WM_CREATE.  Note that
       lpCreateStruct=lParam                             'It Receives A Pointer To The hWnd of The Main
       [email protected]            'Window In lpCreateParams, Which It Stores in
       Call SetWindowLong(hWnd,0,@ptrMain)               'Its cbWndExtra Bytes.
       EnableWindow(@ptrMain,%FALSE)
       fnForm1_WndProc=0
       Exit Function
    Case %WM_PAINT
      Local iLEN As Long, hDC As Long
      Local LpPaint As PAINTSTRUCT
      Local rc As Rect
      hDC = BeginPaint(hWnd, LpPaint)
      rc.nTop=0 : rc.nBottom=16 : rc.nLeft=0 : rc.nRight=300
      Call DrawText(hDC,"This Is Form1.  It Disables The Main",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Window, And That Makes It Modal.",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Note That A Pointer To The Main hWnd",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Was Received During %WM_CREATE ",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"And Stored In The cbWndExtra Bytes.",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"We'll Need That To Call EnableWindow()",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Upon Destruction Of This Dialog.",-1,rc,%DT_SINGLELINE)
      Call EndPaint(hWnd,LpPaint)
      fnForm1_WndProc = 0
      Exit Function
    Case %WM_CHAR
      If Lowrd(wParam)=27 Or Lowrd(wParam)=13 Then           'Send WM_CLOSE Message
         Call SendMessage(hWnd,%WM_CLOSE,wParam,lParam)      'If [ESC] Or [ENTER]
      End If                                                 'Comes 
    Case %WM_CLOSE
      Local hMain As Dword
      If MsgBox("Do You Wish To Destroy This Window?",%MB_YESNO,"Destroy Window")=%IDYES Then
         hMain=GetWindowLong(hWnd,0)
         EnableWindow(hMain,%TRUE)
         fnForm1_WndProc=0
         Call DestroyWindow(hWnd)
      End If
      Exit Function
  End Select

  fnForm1_WndProc=DefWindowProc(hWnd, wMsg, wParam, lParam)
End Function


Function fnForm2_WndProc(Byval hWnd As Long,Byval wMsg As Long,Byval wParam As Long,Byval lParam As Long) As Long
  Select Case As Long wMsg
    Case %WM_CREATE
      Local lpCreateStruct As CREATESTRUCT Ptr          'Window procedure for Form2.  This
      Local ptrMain As Dword Ptr                        'Window SW_HIDEs The Main Window
      lpCreateStruct=lParam                             'In WM_CREATE.  It Also Stores 
      [email protected]            'The hWnd Main Window in cbWndExtra
      Call SetWindowLong(hWnd,0,@ptrMain)               'Bytes
      Call ShowWindow(@ptrMain,%SW_HIDE)
      fnForm2_WndProc=0
      Exit Function
    Case %WM_CHAR
      If Lowrd(wParam)=27 Or Lowrd(wParam)=13 Then
         Call SendMessage(hWnd,%WM_CLOSE,wParam,lParam)
      End If   
    Case %WM_PAINT
      Local hDC As Long
      Local LpPaint As PAINTSTRUCT                 
      Local rc As Rect
      hDC = BeginPaint(hWnd, LpPaint)
      rc.nTop=0 : rc.nBottom=16 : rc.nLeft=0 : rc.nRight=300
      Call DrawText(hDC,"This Is Form2.  It %SW_HIDEs The",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Main Window, And %SW_SHOWs It",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Upon Closing.  The Technique Can",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Be Used Similiarly To A Modal ",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Dialog If It Isn't Necessary To",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"View Simultaneously A Form Under-",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"neath The Dialog With Which You",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Can't Interact Anyway.",-1,rc,%DT_SINGLELINE)
      Call EndPaint(hWnd,LpPaint)
      fnForm2_WndProc = 0
      Exit Function
    Case %WM_CLOSE
      Local hMain As Dword
      If MsgBox("Do You Wish To Destroy This Window?",%MB_YESNO,"Destroy Window")=%IDYES Then
         hMain=GetWindowLong(hWnd,0)
         Call ShowWindow(hMain,%TRUE)
         Call DestroyWindow(hWnd)
         fnForm2_WndProc=0
      Else
         Exit Function
      End If
  End Select

 fnForm2_WndProc=DefWindowProc(hWnd,wMsg,wParam,lParam)
End Function


Function fnForm3_WndProc(Byval hWnd As Long,Byval wMsg As Long,Byval wParam As Long,Byval lParam As Long) As Long
  Local lpCreateStruct As CREATESTRUCT Ptr
  Local iLEN As Long, hDC As Long                    'These Windows Are Produced By 
  Local LpPaint As PAINTSTRUCT                       'Clicking Button #3 On Main
  Local rc As Rect                                   'Form.  You Can Create As Many
                                                     'Of Them As You Like, But They
  Select Case wMsg                                   'Will Be Created In The Same
    Case %WM_CHAR                                    'Place, So To See Them You Have
      If Lowrd(wParam)=27 Or Lowrd(wParam)=13 Then   'To Drag Them From on Top Of One
         Call SendMessage(hWnd,%WM_CLOSE,wParam,lParam)  'And Other
      End If  
    Case %WM_PAINT
      hDC = BeginPaint(hWnd, LpPaint)
      rc.nTop=0 : rc.nBottom=16 : rc.nLeft=0 : rc.nRight=300
      Call DrawText(hDC,"This Is Form3.  Not Only Does It",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Neither Hide Nor Disable The Main",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Window, But You'll Find That You",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Can Create As Many Of These As You",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Want By Continually Clicking Button",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Number Three!  Only Thing Is, You'll",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Have To Drag Them From On Top Of Each",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Other, As They All Appear In The Same",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Location.  You May Further Note That",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Since These Windows Are Neither",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"Disabled Nor Hidden At Any Time, You",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"May Interact With Them Irregardless Of",-1,rc,%DT_SINGLELINE)
      rc.nTop=rc.nTop+16 : rc.nBottom=rc.nTop+16
      Call DrawText(hDC,"The State Of Form1 Or Form2",-1,rc,%DT_SINGLELINE)
      Call EndPaint(hWnd,LpPaint)
      fnForm3_WndProc = 0
      Exit Function
  End Select

  fnForm3_WndProc=DefWindowProc(hWnd, wMsg, wParam, lParam)
End Function


Function fnWndProc_OnCreate(Wea As WndEventArgs) As Long       'Creates the three buttons and registers window
  Local lpCreateStruct As CREATESTRUCT Ptr                     'classes for the three Forms/Windows/Dialogs the
  Local szClassName As Asciiz*16                               'app will create if the corresponding button is
  Local winclass As WndClassEx                                 'pressed
  Local hWnd As DWORD

  lpCreateStruct=Wea.lParam   'Can use GetModuleHandle() here instead, or, use Global (Hate Globals!)
  [email protected]
  hWnd=CreateWindow("button","Button 1",%WS_CHILD Or %WS_VISIBLE,50,25,125,25,Wea.hWnd,%IDC_BUTTON1,Wea.hInst,Byval 0)
  hWnd=CreateWindow("button","Button 2",%WS_CHILD Or %WS_VISIBLE,50,60,125,25,Wea.hWnd,%IDC_BUTTON2,Wea.hInst,Byval 0)
  hWnd=CreateWindow("button","Button 3",%WS_CHILD Or %WS_VISIBLE,50,95,125,25,Wea.hWnd,%IDC_BUTTON3,Wea.hInst,Byval 0)
  'Register Window Classes For Form1, Form2 and Form3
  winclass.cbSize=Sizeof(winclass)
  winclass.style=%CS_HREDRAW Or %CS_VREDRAW
  winclass.cbClsExtra=0
  winclass.cbWndExtra=4
  winclass.hInstance=Wea.hInst
  winclass.hIcon=LoadIcon(%NULL, Byval %IDI_APPLICATION)
  winclass.hCursor=LoadCursor(%NULL, Byval %IDC_ARROW)
  winclass.hbrBackground=GetStockObject(%WHITE_BRUSH)
  winclass.lpszMenuName=%NULL
  szClassName="Form1"                                          'Register Form1 Class
  winclass.lpszClassName=Varptr(szClassName)
  winclass.lpfnWndProc=Codeptr(fnForm1_WndProc)
  Call RegisterClassEx(winclass)
  szClassName="Form2"                                          'Register Form2 Class
  winclass.lpszClassName=Varptr(szClassName)
  winclass.lpfnWndProc=Codeptr(fnForm2_WndProc)
  Call RegisterClassEx(winclass)
  szClassName="Form3"                                          'Register Form3 Class
  winclass.lpszClassName=Varptr(szClassName)
  winclass.lpfnWndProc=Codeptr(fnForm3_WndProc)
  Call RegisterClassEx(winclass)
  
  fnWndProc_OnCreate=0
End Function


Function fnWndProc_OnCommand(Wea As WndEventArgs) As Long
  Local hWnd As Dword   
  
  Select Case Lowrd(Wea.wParam)
    Case %IDC_BUTTON1                  'Button 1 was clicked
      hWnd=CreateWindow("Form1","Form1",%WS_OVERLAPPEDWINDOW,50,25,300,175,Wea.hWnd,0,Wea.hInst,Varptr(Wea.hWnd))
      Call ShowWindow(hWnd,%SW_SHOWNORMAL)
      Call UpdateWindow(hWnd)
    Case %IDC_BUTTON2                  'Button 2 was clicked
      hWnd=CreateWindow("Form2","Form2",%WS_OVERLAPPEDWINDOW,150,150,300,175,Wea.hWnd,0,Wea.hInst,Varptr(Wea.hWnd))
      Call ShowWindow(hWnd,%SW_SHOWNORMAL)
      Call UpdateWindow(hWnd)
    Case %IDC_BUTTON3                  'Button 3 was clicked
      hWnd=CreateWindow("Form3","Form3",%WS_OVERLAPPEDWINDOW,300,500,300,250,Wea.hWnd,0,Wea.hInst,Varptr(Wea.hWnd))
      Call ShowWindow(hWnd,%SW_SHOWNORMAL)
      Call UpdateWindow(hWnd)
  End Select
  
  fnWndProc_OnCommand=0
End Function


Function fnWndProc_OnClose(Wea As WndEventArgs) As Long   'Windows will send this message when the 'x' is clicked
  Call DestroyWindow(Wea.hWnd)
  Call PostQuitMessage(0)
  
  fnWndProc_OnClose=0
End Function


Function fnWndProc(Byval hWnd As Long,Byval wMsg As Long,Byval wParam As Long,Byval lParam As Long) As Long
  Static Wea As WndEventArgs

  Select Case wMsg
    Case %WM_CREATE
      Wea.hWnd=hWnd : Wea.wParam=wParam : Wea.lParam=lParam
      fnWndProc=fnWndProc_OnCreate(Wea)
      Exit Function
    Case %WM_COMMAND
      Wea.hWnd=hWnd : Wea.wParam=wParam : Wea.lParam=lParam
      fnWndProc=fnWndProc_OnCommand(Wea)
      Exit Function
    Case %WM_CLOSE
      Wea.hWnd=hWnd : Wea.wParam=wParam : Wea.lParam=lParam
      fnWndProc=fnWndProc_OnClose(Wea)
      Exit Function
  End Select

  fnWndProc=DefWindowProc(hWnd, wMsg, wParam, lParam)
End Function


Function WinMain(Byval hIns As Long, Byval hPrev As Long,Byval lpCL As Asciiz Ptr,Byval iShow As Long) As Long
  Local Msg As tagMsg
  Local winclass As WndClassEx
  Local szAppName As Asciiz * 16
  Local hWnd As Dword

  szAppName="Form9"
  winclass.lpszClassName=Varptr(szAppName)               : winclass.lpfnWndProc=Codeptr(fnWndProc)
  winclass.cbSize=Sizeof(winclass)                       : winclass.style=%CS_HREDRAW Or %CS_VREDRAW
  winclass.cbClsExtra=0                                  : winclass.cbWndExtra=0
  winclass.hInstance=hIns                                : winclass.hIcon=LoadIcon(%NULL, Byval %IDI_APPLICATION)
  winclass.hCursor=LoadCursor(%NULL, Byval %IDC_ARROW)   : winclass.hbrBackground=%COLOR_BTNFACE+1
  winclass.lpszMenuName=%NULL                            : winclass.hIconSm=LoadIcon(hIns, Byval %IDI_APPLICATION)
  Call RegisterClassEx(winclass)
  hWnd=CreateWindow(szAppName,"Form9",%WS_OVERLAPPEDWINDOW,450,300,240,190,0,0,hIns,Byval 0)
  Call ShowWindow(hWnd,iShow)
  Call UpdateWindow(hWnd)
  While GetMessage(Msg,%NULL,0,0)
    Call TranslateMessage(Msg)
    Call DispatchMessage(Msg)
  Wend

  Function=msg.wParam
End Function
              Fred
              "fharris"+Chr$(64)+"evenlink"+Chr$(46)+"com"

              Comment

              • #8
                Now I get it.

                OK, I get it now. I was confused by your use of "cbhndl"

                These are examples of what is working for me:
                EnableWindow (GetDlgItem (hDlg, 612), 1)
                EnableWindow (GetDlgItem (hDlg, 610), 0)

                I knew about EnableWindow, I was just lacking the GetDlgItem part.
                Gary Peek, Industrologic, Inc.

                Comment

                • #9
                  You may somewhat think as windows and their controls are often accessed by hWnd's only.
                  For dialogs the combination hDlg+CtrlID is more common.
                  Therefore the calls contain 'dlg' in these names.

                  This is a no-discussion though since in practise these calls are very exchangable.
                  I think i can find a few real dlg-only calls but for the usual stuff it works on custom window classes as dialogboxes.

                  I think the hDlg+CtrlID is more or less invented for use with dialog resources/templates.
                  Using plain SDK windows stuff usually CreateWindow() is used, eventually without controlid.

                  You won't see much code without ctrl-id's nowadays (if any).

                  This is all speculative, just forget..
                  hellobasic

                  Comment

                  • #10
                    These are examples of what is working for me:
                    Code:
                    EnableWindow (GetDlgItem (hDlg, 612), 1)
EnableWindow (GetDlgItem (hDlg, 610), 0)
                    That might be working for you, but I really really really think you should get out of the habit of using in-line numeric literals - aka "magic numbers" - in your code.

                    When you have to go back to that code in six months, won't t be a lot easier to understand were it to read....
                    Code:
                    EnableWindow (GetDlgItem (hDlg, %ID_NAME), %TRUE)
EnableWindow (GetDlgItem (hDlg, %ID_ADDRESS), %FALSE)
                    ????
                    Michael Mattias
                    Tal Systems (retired)
                    Port Washington WI USA
                    [email protected]
                    http://www.talsystems.com

                    Comment

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