Ciao Guide,
Il colore iniziale di sfondo dei controlli, per ottenere la trasparenza, deve essere bianco:
codice:
Option Explicit
Const LWA_COLORKEY = &H1
Const LWA_ALPHA = &H2
Const GWL_EXSTYLE = (-20)
Const WS_EX_LAYERED = &H80000
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 SetLayeredWindowAttributes Lib "user32" (ByVal hWnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long
' -----------------------------------------------------------
Private Sub Form_Load()
' Lo sfondo č trasparente:
Text1.BackColor = &HFFFFFF
' Lo sfondo NON č trasparente:
Text2.BackColor = &HE0E0E0
Dim Ret As Long
Ret = GetWindowLong(Me.hWnd, GWL_EXSTYLE)
Ret = Ret Or WS_EX_LAYERED
SetWindowLong Me.hWnd, GWL_EXSTYLE, Ret
SetLayeredWindowAttributes Me.hWnd, 0, 128, LWA_ALPHA
SetLayeredWindowAttributes Form1.hWnd, &HFFFFFF, 0, LWA_COLORKEY
End Sub