by D Lee (1 Submission)
Category: Windows API Call/Explanation
Compatability: Visual Basic 5.0
Difficulty: Advanced
Date Added: Wed 3rd February 2021
Rating: 
(3 Votes)
This code allows you to make a non-sizeable control in VB 6.0, to a sizeable control.
Inputs
X as Control
Y as Form
Assumes
Thanks to Randy Birch, for most of the code, I encapsulated it as a class, hence:
'to use the class, create a Form1 and Textbox1
Dim clsA as clsUser
Set clsA = New clsUser
clsA.SetControlResize(Textbox1, Me)
Set clsA = Nothing
API DeclarationsOption Explicit
'windows constants
Private Const SWP_DRAWFRAME As Long = &H20
Private Const SWP_NOMOVE As Long = &H2
Private Const SWP_NOSIZE As Long = &H1
Private Const SWP_NOZORDER As Long = &H4
Private Const SWP_FLAGS As Long = SWP_NOZORDER Or SWP_NOSIZE Or _
SWP_NOMOVE Or SWP_DRAWFRAME
Private Const GWL_STYLE As Long = (-16)
Private Const WS_THICKFRAME As Long = &H40000
Private Declare Function GetWindowLong Lib "user32" _
Alias "GetWindowLongA" _
(ByVal hwnd As Long, _
ByVal nIndex As Long) As Long
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 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
VBcodersPublic Sub SetControlResize(X As Control, Y As Form)
Dim style As Long
'get the current style attributes for the control
style = GetWindowLong(X.hwnd, GWL_STYLE)
'modify the style to show the sizing frame
style = style Or WS_THICKFRAME
'set the control to the chosen style
If style Then
Call SetWindowLong(X.hwnd, GWL_STYLE, style)
Call SetWindowPos(X.hwnd, Y.hwnd, 0, 0, 0, 0, SWP_FLAGS)
End If
End Sub