半透明窗體(win2000特有API)
Windows2000已經出了一年多了,就先介紹一下Windows2000特有的API吧!! AnimateWindow是一個窗口打開和關閉時產生動畫效果的新函數，因為是一個新的函數, 所以在 API Viewer中是找不到的,必需自己定義:
| Public Declare Function SetLayeredWindowAttributes Lib "user32" (ByVal hwnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long '具體可以使用的常量及其用法 Const LWA_ALPHA=&H2 '表示把窗體設置成半透明樣式 Const LWA_COLORKEY=&H1 '表示不顯示窗體中的透明色 |
具體例子
程序代碼
| Module1 Public Declare Function SetLayeredWindowAttributes Lib "user32" (ByVal hwnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long Public Const WS_EX_LAYERED = &H80000 Public Const GWL_EXSTYLE = (-20) Public Const LWA_ALPHA = &H2 Public Const LWA_COLORKEY = &H1 Public Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long Form1 Private Sub Form_Load() Dim rtn As Long rtn = GetWindowLong(Me.hwnd, GWL_EXSTYLE) '取的窗口原先的樣式 rtn = rtn Or WS_EX_LAYERED '使窗體添加上新的樣式WS_EX_LAYERED SetWindowLong Me.hWnd, GWL_EXSTYLE, rtn '把新的樣式賦給窗體 SetLayeredWindowAttributes me.hwnd, 0, 192, LWA_ALPHA '把窗體設置成半透明樣式,第二個參數表示透明程度 '取值范圍0--255,為0時就是一個全透明的窗體了 End Sub 第二種使用方法 SetLayeredWindowAttributes Me.hWnd, &H0, 0, LWA_COLORKEY '表明不顯示窗體中的透明色 '而第二個參數表示透明色為黑色,并且你可以用RGB函數來指定顏色值 |