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Thread: changing the .Style of Combo in runtime

  1. #1

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    Question changing the .Style of Combo in runtime

    Hey folks,
    I raised a thread for manipulating combo's .Style (my original thread) simultaneously I googled and found a code snippet at this link. I have already given this link, still as this happens to be a lots of API, so I thought I should also post the same here as well. Now pls don't start replying "this is double post" etc (that's why I gave so much writing above )
    Now APIans pls let me know how to use that code in changing the .Style at runtime.
    Thankz

  2. #2
    PoorPoster iPrank's Avatar
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    Change ComboBox Style at Runtime [VB6]

    I have written 3 wrapper functions for your linked code. Hope this helps:

    Form Code (For Testing Only)
    vb Code:
    1. ' Add 3 command buttons in the form and paste this code.
    2. Option Explicit
    3.  
    4. Private Sub Command1_Click()
    5.     Dim ctl As ComboBox
    6.     '
    7.     Set ctl = AddSimpleCombo(Me, "Cbo1")
    8.  
    9.     '
    10.     If Not ctl Is Nothing Then
    11.         ctl.AddItem "AAAA"
    12.         ctl.AddItem "BBBB"
    13.         ctl.AddItem "CCCC"
    14.         ctl.Left = Command1.Left + Command1.Width + 200
    15.         ctl.Top = Command1.Top
    16.         ctl.Visible = True
    17.     End If
    18.  
    19.     '
    20. End Sub
    21.  
    22. Private Sub Command2_Click()
    23.     Dim ctl As ComboBox
    24.     '
    25.     Set ctl = AddDropDownCombo(Me, "Cbo2")
    26.  
    27.     '
    28.     If Not ctl Is Nothing Then
    29.         ctl.AddItem "DDDD"
    30.         ctl.AddItem "EEEE"
    31.         ctl.AddItem "FFFF"
    32.         ctl.Left = Command2.Left + Command2.Width + 200
    33.         ctl.Top = Command2.Top
    34.         ctl.Visible = True
    35.     End If
    36.  
    37.     '
    38. End Sub
    39.  
    40. Private Sub Command3_Click()
    41.     Dim ctl As ComboBox
    42.     '
    43.     Set ctl = AddDropDownList(Me, "Cbo3")
    44.  
    45.     '
    46.     If Not ctl Is Nothing Then
    47.         ctl.AddItem "GGGG"
    48.         ctl.AddItem "HHHH"
    49.         ctl.AddItem "IIII"
    50.         ctl.Left = Command3.Left + Command3.Width + 200
    51.         ctl.Top = Command3.Top
    52.         ctl.Visible = True
    53.     End If
    54.  
    55.     '
    56. End Sub
    57.  
    58. Private Sub Form_Load()
    59.     Command1.Left = 300
    60.     Command1.Caption = "Add Simple Combo"
    61.     '
    62.     Command2.Left = 300
    63.     Command2.Caption = "Add DropDown Combo"
    64.     '
    65.     Command3.Left = 300
    66.     Command3.Caption = "Add DropDown List"
    67. End Sub

    Module Code
    vb Code:
    1. Option Explicit
    2. '
    3. Private Const CBS_SIMPLE As Long = &H1&
    4. Private Const CBS_DROPDOWN As Long = &H2&
    5. Private Const CBS_DROPDOWNLIST As Long = &H3&
    6. '
    7. Private Declare Function SetWindowsHookEx _
    8.                 Lib "user32" _
    9.                 Alias "SetWindowsHookExA" (ByVal idHook As Long, _
    10.                                            ByVal lpFn As Long, _
    11.                                            ByVal hMod As Long, _
    12.                                            ByVal dwThreadId As Long) As Long
    13. Private Declare Function UnhookWindowsHookEx _
    14.                 Lib "user32" (ByVal hHook As Long) As Long
    15. Private Declare Function CallNextHookEx _
    16.                 Lib "user32" (ByVal hHook As Long, _
    17.                               ByVal nCode As Long, _
    18.                               ByVal wParam As Long, _
    19.                               lParam As Any) As Long
    20. '
    21. Private Const WH_CBT = 5&
    22. Private Const HC_ACTION = 0&
    23. Private Const HCBT_CREATEWND = 3&
    24. '
    25. Private Const GWL_STYLE = (-16)
    26. Private Const GWL_EXSTYLE = (-20)
    27. '
    28. Private Declare Function GetWindowLong _
    29.                 Lib "user32" _
    30.                 Alias "GetWindowLongA" (ByVal hwnd As Long, _
    31.                                         ByVal nIndex As Long) As Long
    32. Private Declare Function SetWindowLong _
    33.                 Lib "user32" _
    34.                 Alias "SetWindowLongA" (ByVal hwnd As Long, _
    35.                                         ByVal nIndex As Long, _
    36.                                         ByVal dwNewLong As Long) As Long
    37. Private Declare Function GetClassName _
    38.                 Lib "user32" _
    39.                 Alias "GetClassNameA" (ByVal hwnd As Long, _
    40.                                        ByVal lpClassName As String, _
    41.                                        ByVal nMaxCount As Long) As Long
    42. 'hook arg vars...
    43. Dim m_hHook As Long
    44. Dim m_ClassName As String
    45. Dim m_StylesAdd As Long, m_StylesRemove As Long
    46. Dim m_ExStylesAdd As Long, m_ExStylesRemove As Long
    47. Dim m_CallNext As Boolean
    48. Dim m_UseExactClassname As Boolean
    49.  
    50. Public Function AddSimpleCombo(ContainerForm As Form, _
    51.                                strComboName As String) As ComboBox
    52.  
    53.     If NoControlWithSameName(ContainerForm, strComboName) Then
    54.         CbtHookStyle "ThunderComboBox", True, CBS_SIMPLE, CBS_DROPDOWN Or CBS_DROPDOWNLIST, 0, 0, True
    55.         Set AddSimpleCombo = ContainerForm.Controls.Add("VB.ComboBox", strComboName)
    56.         CbtUnhookStyle
    57.     End If
    58.  
    59. End Function
    60.  
    61. Public Function AddDropDownCombo(ContainerForm As Form, _
    62.                                  strComboName As String) As ComboBox
    63.  
    64.     If NoControlWithSameName(ContainerForm, strComboName) Then
    65.         CbtHookStyle "ThunderComboBox", True, CBS_DROPDOWN, 0, 0, 0, True
    66.         Set AddDropDownCombo = ContainerForm.Controls.Add("VB.ComboBox", strComboName)
    67.         CbtUnhookStyle
    68.     End If
    69.  
    70. End Function
    71.  
    72. Public Function AddDropDownList(ContainerForm As Form, _
    73.                                 strComboName As String) As ComboBox
    74.  
    75.     If NoControlWithSameName(ContainerForm, strComboName) Then
    76.         CbtHookStyle "ThunderComboBox", True, CBS_DROPDOWNLIST, 0, 0, 0, True
    77.         Set AddDropDownList = ContainerForm.Controls.Add("VB.ComboBox", strComboName)
    78.         CbtUnhookStyle
    79.     End If
    80.  
    81. End Function
    82.  
    83. Private Sub CbtHookStyle(sClassname As String, _
    84.                          Optional ByVal UseExactClassname As Boolean = False, _
    85.                          Optional ByVal StylesAdd As Long = 0&, _
    86.                          Optional ByVal StylesRemove As Long = 0&, _
    87.                          Optional ByVal ExStylesAdd As Long = 0&, _
    88.                          Optional ByVal ExStylesRemove As Long = 0&, _
    89.                          Optional ByVal CallNextHook As Boolean = False)
    90.     'Sets hook - call just prior to adding control
    91.     CbtUnhookStyle 'allow only 1 active at any time
    92.     m_ClassName = sClassname
    93.     m_StylesAdd = StylesAdd
    94.     m_StylesRemove = StylesRemove
    95.     m_ExStylesAdd = ExStylesAdd
    96.     m_ExStylesRemove = ExStylesRemove
    97.     m_CallNext = CallNextHook
    98.     m_UseExactClassname = UseExactClassname
    99.     m_hHook = SetWindowsHookEx(WH_CBT, AddressOf CbtHook, 0&, App.ThreadID)
    100. End Sub
    101.  
    102. Private Sub CbtUnhookStyle()
    103.  
    104.     'unhooks - call immediately after adding control
    105.     If m_hHook <> 0& Then
    106.         UnhookWindowsHookEx m_hHook
    107.         m_hHook = 0&
    108.     End If
    109.  
    110. End Sub
    111.  
    112. Private Function NoControlWithSameName(ContainerForm As Form, _
    113.                                        strComboName As String) As Boolean
    114.     On Error GoTo ErrHndlr
    115.     Dim ctl As Control
    116.  
    117.     For Each ctl In ContainerForm.Controls
    118.  
    119.         If ctl.Name = strComboName Then
    120.             Exit Function
    121.         End If
    122.  
    123.     Next
    124.  
    125.     NoControlWithSameName = True
    126.     Exit Function
    127. ErrHndlr:
    128. End Function
    129.  
    130. Private Function CbtHook(ByVal nCode As Long, _
    131.                          ByVal hwnd As Long, _
    132.                          ByVal lpCBCT As Long) As Long
    133.  
    134.     Select Case nCode
    135.  
    136.         Case Is < HC_ACTION
    137.             CbtHook = CallNextHookEx(m_hHook, nCode, hwnd, ByVal lpCBCT)
    138.             Exit Function '===============>>>
    139.  
    140.         Case HCBT_CREATEWND
    141.             OnCreate ByVal hwnd
    142.  
    143.         Case Else
    144.             'do nothing
    145.     End Select
    146.  
    147.     If m_CallNext Then
    148.         CbtHook = CallNextHookEx(m_hHook, nCode, hwnd, ByVal lpCBCT)
    149.     End If
    150.  
    151. End Function
    152.  
    153. Private Sub OnCreate(ByVal hwnd As Long)
    154.     Dim L As Long, lRet As Long
    155.     Dim sClass As String
    156.     Dim bHit As Boolean
    157.     sClass = String(256, 0)
    158.     lRet = GetClassName(hwnd, sClass, 255&)
    159.  
    160.     If lRet > 0& Then
    161.         If m_UseExactClassname Then
    162.             '(non case-sens match)
    163.             sClass = Left$(sClass, lRet)
    164.             bHit = (StrComp(sClass, m_ClassName, vbTextCompare) = 0)
    165.         Else
    166.             '(fuzzy match)
    167.             bHit = (InStr(1, sClass, m_ClassName, vbTextCompare) > 0)
    168.         End If
    169.  
    170.         If bHit Then
    171.  
    172.             'make style, exstyle changes...
    173.             If (m_StylesAdd Or m_StylesRemove) <> 0& Then
    174.                 L = GetWindowLong(hwnd, GWL_STYLE)
    175.                 L = L Or m_StylesAdd
    176.                 L = L And (Not m_StylesRemove)
    177.                 SetWindowLong hwnd, GWL_STYLE, L
    178.             End If
    179.  
    180.             If (m_ExStylesAdd Or m_ExStylesRemove) <> 0& Then
    181.                 L = GetWindowLong(hwnd, GWL_EXSTYLE)
    182.                 L = L Or m_ExStylesAdd
    183.                 L = L And (Not m_ExStylesRemove)
    184.                 SetWindowLong hwnd, GWL_EXSTYLE, L
    185.             End If
    186.         End If 'is class
    187.     End If
    188.  
    189. End Sub
    Last edited by iPrank; Jun 4th, 2008 at 01:04 PM.
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  3. #3

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    Re: changing the .Style of Combo in runtime

    Thanks a lot

  4. #4
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    Re: changing the .Style of Combo in runtime

    Hello, guys.
    I have tried this solution and I was impressed how it works. But after I made an .exe I was disappointed - all combos created this way (I used AddDropDownList) were just Dropdowns, not lists.

    Can you help me, please?
    Thanks in advance.

  5. #5
    VB-aholic & Lovin' It LaVolpe's Avatar
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    Re: changing the .Style of Combo in runtime

    VB6 uses different window classes, many times, when changing from IDE to EXE.

    In IDE: the combobox class is ThunderComboBox
    As EXE: the combobox class is ThunderRT6ComboBox

    You may want to add an IsInIDE function so you can change the class name as needed. Forum has several examples of such a function
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  6. #6
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    Re: changing the .Style of Combo in runtime

    Great, you helped me much!
    Thank you for your quick answer.

    I've found some window class names now (after your help), but I don't know what are the differences between them (ComboBox - ThunderComboBox, Edit - TEdit - ThunderTextBox, etc.). Do you?
    But this is not so important as the first issue you've solved. Thanks.

    Code:
    	static char s_szClass[][32] = 
    	{
    		"Button",					// ��ť��			0
    		"Edit",						// �༭����			1
    		"ComboBox",					// ��Ͽ���			2
    		"ListBox",					//��			3
    		"ScrollBar",				//					4
    		"Static",					//					5
    		"#32770",					//					6
    		"#32768",					//popupMenu			7
    		"msctls_hotkey32",			// �ȼ�				8
    		"SysIPAddress32",			// IP ��ַ			9
    		"SysListView32",			// �б�鿴			10
    		"SysTreeView32",			// ���β鿴			11
    		"SysDateTimePick32",		// ����/ʱ��ѡ��	12
    		"msctls_updown32",			// ��ת				13
    		"SysMonthCal32",			// ����				14
    		"SysTabControl32",			// TAB �ؼ�			15
    		"msctls_progress32",		// ������			16
    		"msctls_trackbar32",		// ׷����			17
    		"ComboLBox",				//combo list		18	
    		"SysHeader32",				//header			19
    		"msctls_statusbar32",		//statusbar			20
    		"ToolbarWindow32",			//statusbar			21
    		"MDICLIENT"	,				//mdiclient			22					
    		"AfxControlBar"				//controlbar		23
    
    		"TButton",					// VCL TButton ��
    		"ThunderCommandButton",		// Visual Basic Command Button ��
    		"ThunderRT6CommandButton",	// Visual Basic Command Button ��
    		"TCheckBox",
    		"ThunderCheckBox",
    		"ThunderRT6CheckBox",
    		"TEdit",
    		"TNumberEdit",
    		"ThunderTextBox",
    		"ThunderRT6TextBox",
    		"TComboBox",
    		"ThunderComboBox",
    		"ThunderRT6ComboBox"		
    
    	};

  7. #7
    VB-aholic & Lovin' It LaVolpe's Avatar
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    Re: changing the .Style of Combo in runtime

    VB controls/forms have Thunder in them for the most part. So ThunderTextBox is VB's version of the Edit class & both are textboxes. ThunderComboBox is VB's version of the ComobBox & both are comboboxes. Just keep in mind that uncompiled/compiled VB class names are not guaranteed to be the same.

    Since the basic question has been answered, you should start your own thread if you have further questions not directly related to the code posted above.
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    Newbie? Novice? Bored? Spend a few minutes browsing the FAQ section of the forum.
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    Here is the list of TAGs you can use to format your posts
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