by Satin Katiyar (1 Submission)
Category: Windows API Call/Explanation
Compatability: Visual Basic 3.0
Difficulty: Unknown Difficulty
Date Added: Wed 3rd February 2021
Rating: 
(16 Votes)
This code makes the form Tranparent but keep the OBJECTS visible.
Orignally Written by Kalani COM
Modified by Satin Katiyar
Inputs
Refrence to form & a array containing the objects to be kept Visible
Assumes
User Must Know how to pass objects.The Example of use is as give below:
Here We are assuming a command button having name command1 & Text box Having name Text1
Private Sub Form_Load()
Dim obj(1) As Object 'Use no. of controls -1 instead of 1
Set obj(0) = Command1
Set obj(1) = Text1
SetTransparent frm, obj
End Sub
API DeclarationsDeclare Function GetWindowRect Lib "user32" (ByVal hWnd As Long, lpRECT As RECT) As Long
Declare Function GetClientRect Lib "user32" (ByVal hWnd As Long, lpRECT As RECT) As Long
Declare Function CombineRgn Lib "gdi32" (ByVal hDestRgn As Long, ByVal hSrcRgn1 As Long, ByVal hSrcRgn2 As Long, ByVal nCombineMode As Long) As Long
Declare Function CreateRectRgn Lib "gdi32" (ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Declare Function ScreenToClient Lib "user32" (ByVal hWnd As Long, lpPoint As POINTAPI) As Long
Declare Function SetWindowRgn Lib "user32" (ByVal hWnd As Long, ByVal hRgn As Long, ByVal bRedraw As Boolean) As Long
Public Const RGN_AND = 1
Public Const RGN_COPY = 5
Public Const RGN_DIFF = 4
Public Const RGN_OR = 2
Public Const RGN_XOR = 3
Type POINTAPI
x As Long
Y As Long
End Type
Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
VBcodersPublic Sub SetTransparent(frm As Form, obj() As Object)
'This code was takin from a AOL Visual Basic
'Message Board. It was submited by: SOOPRcow
'Modified By Satin Katiyar
Dim rctClient As RECT, rctFrame As RECT
Dim hClient As Long, hFrame As Long, hObj As Long
Dim Start As Integer, Finish As Integer, I As Integer
'// Grab client area and frame area
GetWindowRect frm.hWnd, rctFrame
GetClientRect frm.hWnd, rctClient
'// Convert client coordinates to screen coordinates
Dim lpTL As POINTAPI, lpBR As POINTAPI
lpTL.x = rctFrame.Left
lpTL.Y = rctFrame.Top
lpBR.x = rctFrame.Right
lpBR.Y = rctFrame.Bottom
ScreenToClient frm.hWnd, lpTL
ScreenToClient frm.hWnd, lpBR
rctFrame.Left = lpTL.x
rctFrame.Top = lpTL.Y
rctFrame.Right = lpBR.x
rctFrame.Bottom = lpBR.Y
rctClient.Left = Abs(rctFrame.Left)
rctClient.Top = Abs(rctFrame.Top)
rctClient.Right = rctClient.Right + Abs(rctFrame.Left)
rctClient.Bottom = rctClient.Bottom + Abs(rctFrame.Top)
rctFrame.Right = rctFrame.Right + Abs(rctFrame.Left)
rctFrame.Bottom = rctFrame.Bottom + Abs(rctFrame.Top)
rctFrame.Top = 0
rctFrame.Left = 0
'// Convert RECT structures to region handles
hClient = CreateRectRgn(rctClient.Left, rctClient.Top, rctClient.Right, rctClient.Bottom)
hFrame = CreateRectRgn(rctFrame.Left, rctFrame.Top, rctFrame.Right, rctFrame.Bottom)
'//Set the Scale mode of form to pixels
Dim mode As Integer
mode = frm.ScaleMode
frm.ScaleMode = 3
'// Create the new "Transparent" boundry & Add the control regions to it
CombineRgn hFrame, hClient, hFrame, RGN_XOR
Start = LBound(obj)
Finish = UBound(obj)
For I = Start To Finish
hObj = CreateRectRgn(obj(I).Left + 4, obj(I).Top + 23, obj(I).Left + obj(I).Width + 4, obj(I).Top + obj(I).Height + 23)
CombineRgn hFrame, hObj, hFrame, RGN_OR
Next
'// Now lock the window's area to this created region
SetWindowRgn frm.hWnd, hFrame, True
'//Restores the scale mode
frm.ScaleMode = mode
End Sub
