步骤一：打开VB建立一个窗体Form
步骤二：将窗体背景颜色设为
：&HFF0000
步骤三：将下面代码粘贴到程序中：
Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" () Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long,ByVal nIndex As Long) As Long
Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" () Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long,ByVal nIndex As Long,ByVal dwNewLong As Long) As Long
Declare Function SetLayeredWindowAttributes Lib "user32" () Declare Function SetLayeredWindowAttributes Lib "user32" (ByVal hwnd As Long,ByVal crKey As Long,ByVal bAlpha As Byte,ByVal dwFlags As Long) As Long
Private Const WS_EX_LAYERED = &H80000
Const GWL_EXSTYLE = () Const GWL_EXSTYLE = (-20)
Private Const LWA_ALPHA = &H2
Private Const LWA_COLORKEY = &H1
Sub Form_Load()
Dim rtn As Long
rtn = GetWindowLong(hwnd,GWL_EXSTYLE)
rtn = rtn Or WS_EX_LAYERED
SetWindowLong hwnd,GWL_EXSTYLE,rtn
SetLayeredWindowAttributes hwnd,100,LWA_ALPHA
End Sub
运行结果如下：