mdlmain.bas

一个是窗口慢慢变透明的源代码,非常适合在弹出或开启窗口下使用.

Attribute VB_Name = "mdlmain"
Option Explicit
Private Declare Function GetWindowLong Lib "user32.dll" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Private Declare Function SetLayeredWindowAttributes Lib "user32.dll" (ByVal hwnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long
Private Declare Function SetWindowLong Lib "user32.dll" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" (ByVal hwnd As Long, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long

Private Const LWA_ALPHA = &H2
Private Const LWA_COLORKEY = &H1
Private Const GWL_EXSTYLE = -20
Private Const WS_EX_LAYERED = &H80000

Public Sub setfrm(frm As Form, ByVal limpid As Long) ' 设置窗体透明度
    Call SetWindowLong(frm.hwnd, GWL_EXSTYLE, GetWindowLong(frm.hwnd, GWL_EXSTYLE) Or WS_EX_LAYERED)
    Call SetLayeredWindowAttributes(frm.hwnd, 0, limpid, LWA_ALPHA)    'limpid在0--255之间
End Sub