by Haeresis (2 Submissions)
Category: Windows API Call/Explanation
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Thu 3rd January 2002
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
With this module and few lines of code in your form you can add a new button in a titlebar. (for example like the GetRight software does)
API Declarations
Option Explicit
'*********************
'* API Declarations *
'*********************
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function GetWindowRect Lib "user32" (ByVal hwnd As Long, lpRect As Rect) As Long
Private Declare Function GetParent Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function SetParent Lib "user32" (ByVal hWndChild As Long, ByVal hWndNewParent As Long) As Long
Private Declare Function SetWindowPos Lib "user32" (ByVal hwnd As Long, ByVal hWndInsertAfter As Long, ByVal x As Long, ByVal y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long
Private Declare Function SetWindowsHookEx Lib "user32" Alias "SetWindowsHookExA" (ByVal idHook&, ByVal lpfn&, ByVal hmod&, ByVal dwThreadId&) As Long
Private Declare Function UnhookWindowsHookEx Lib "user32" (ByVal hHook&) As Long
Private Declare Function CreateWindowEx Lib "user32" Alias "CreateWindowExA" (ByVal dwExStyle As Long, ByVal lpClassName As String, ByVal lpWindowName As String, ByVal dwStyle As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hWndParent As Long, ByVal hMenu As Long, ByVal hInstance As Long, lpParam As Any) As Long
Private Declare Function ShowWindow Lib "user32" (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long
'*********************
'* Type Declarations *
'*********************
Private Type Rect
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Private Type CWPSTRUCT
lParam As Long
wParam As Long
Message As Long
hwnd As Long
End Type
Private MiaFormHandle As Long
'*********************
'* Consts *
'*********************
Const WM_MOVE = &H3
Const WM_SETCURSOR = &H20
Const WM_NCPAINT = &H85
Const WM_COMMAND = &H111
Const SWP_FRAMECHANGED = &H20
Const GWL_EXSTYLE = -20
'*********************
'* Vars *
'*********************
Private WHook&
Private ButtonHwnd As Long
Public Sub Init(MiaForm As Form, TestoPulsante As String)
' Handle della form
MiaFormHandle = MiaForm.hwnd
'Create the button that is going to be placed in the Titlebar
ButtonHwnd& = CreateWindowEx(0&, "Button", TestoPulsante, &H40000000, 50, 50, 14, 14, MiaFormHandle, 0&, App.hInstance, 0&)
'Show the button cause it´s invisible
Call ShowWindow(ButtonHwnd&, 1)
'Initialize the window hooking for the button
WHook = SetWindowsHookEx(4, AddressOf HookProc, 0, App.ThreadID)
Call SetWindowLong(ButtonHwnd&, GWL_EXSTYLE, &H80)
Call SetParent(ButtonHwnd&, GetParent(MiaFormHandle))
End Sub
Public Sub Terminate()
'Terminate the window hooking
Call UnhookWindowsHookEx(WHook)
Call SetParent(ButtonHwnd&, MiaFormHandle)
End Sub
Public Function HookProc&(ByVal nCode&, ByVal wParam&, Inf As CWPSTRUCT)
Dim FormRect As Rect
Static LastParam&
If Inf.hwnd = GetParent(ButtonHwnd&) Then
If Inf.Message = WM_COMMAND Then
Select Case LastParam
'If the LastParam is cmdInTitlebar call the Click-Procedure
'of the button
Case ButtonHwnd&: Call Screen.ActiveForm.cmdInTitlebar_Click
End Select
ElseIf Inf.Message = WM_SETCURSOR Then
LastParam = Inf.wParam
End If
ElseIf Inf.hwnd = MiaFormHandle Then
If Inf.Message = WM_NCPAINT Or Inf.Message = WM_MOVE Then
'Get the size of the Form
Call GetWindowRect(MiaFormHandle, FormRect)
'Place the button int the Titlebar
Call SetWindowPos(ButtonHwnd&, 0, FormRect.Right - 75, FormRect.Top + 6, 17, 14, SWP_FRAMECHANGED)
End If
End If
End Function
VBcoders
Private Sub Form_Load()
Call Init(Me, "?")
End Sub
Private Sub Form_Unload(Cancel As Integer)
Call Terminate
End Sub
Public Sub cmdInTitlebar_Click()
MsgBox "Ciao!", vbInformation
End Sub
' That's all! :)
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