VB制作透明控件。

Option ExplicitPrivate Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)Private Declare Function GetClientRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As LongPrivate Declare Function ClientToScreen Lib "user32" (ByVal hwnd As Long, lpPoint As POINTAPI) As LongPrivate Declare Function ScreenToClient Lib "user32" (ByVal hwnd As Long, lpPoint As POINTAPI) As LongPrivate Declare Function SetRect Lib "user32" (lpRect As RECT, ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As LongPrivate Declare Function OffsetRect Lib "user32" (lpRect As RECT, ByVal X As Long, ByVal Y As Long) As LongPrivate Type POINTAPI        X As Long        Y As LongEnd TypePrivate Type RECT        Left As Long        Top As Long        Right As Long        Bottom As LongEnd TypePrivate Declare Function DrawText Lib "user32" Alias "DrawTextA" (ByVal hdc As Long, ByVal lpStr As String, ByVal nCount As Long, lpRect As RECT, ByVal wFormat As Long) As LongPrivate Const DT_SINGLELINE = &H20Private Const DT_CENTER = &H1Private Const DT_VCENTER = &H4Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As LongPrivate Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long, ByVal hdc As Long) As LongPrivate Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As Long) As LongPrivate Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As LongPrivate Declare Function CreateCompatibleBitmap Lib "gdi32" (ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As LongPrivate Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As LongPrivate Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As LongPrivate Declare Function ShowWindow Lib "user32" (ByVal hwnd As Long, ByVal nCmdShow As Long) As LongPrivate Const SW_SHOW = 5Private Const SW_HIDE = 0Private Declare Function BitBlt Lib "gdi32" (ByVal hDestDC As Long, ByVal X As Long, ByVal Y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As LongPrivate Declare Function AlphaBlend Lib "msimg32" (ByVal hDestDC As Long, ByVal X As Long, ByVal Y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal widthSrc As Long, ByVal heightSrc As Long, ByVal blendFunct As Long) As BooleanDim m_hMemDC As LongDim m_hMemBmp As Long, m_hMemBmpPrev As LongDim m_rcControl As RECTPrivate Sub UserControl_Initialize()    UserControl.AutoRedraw = True    UserControl.BackColor = vbRed    m_hMemDC = CreateCompatibleDC(UserControl.hdc)End SubPrivate Sub UserControl_Terminate()    If m_hMemBmp <> 0 Then        DeleteObject SelectObject(m_hMemDC, m_hMemBmpPrev)    End If    DeleteDC m_hMemDCEnd SubPublic Sub Translucence()    Dim hdc As Long    Dim tPt As POINTAPI    '获得控件当前位置和大小    ClientToScreen UserControl.hwnd, tPt    ScreenToClient UserControl.ContainerHwnd, tPt    Call GetClientRect(UserControl.hwnd, m_rcControl)    OffsetRect m_rcControl, tPt.X, tPt.Y    '创建一幅内存位图    If m_hMemBmp <> 0 Then        DeleteObject (SelectObject(m_hMemDC, m_hMemBmpPrev))    End If    m_hMemBmp = CreateCompatibleBitmap(UserControl.hdc, m_rcControl.Right, m_rcControl.Bottom)    m_hMemBmpPrev = SelectObject(m_hMemDC, m_hMemBmp)        '隐藏控件    ShowWindow UserControl.hwnd, SW_HIDE    DoEvents        '保存控件容器的图像到内存位图中    Dim hDesktopDC As Long    hDesktopDC = GetDC(UserControl.hwnd)    BitBlt m_hMemDC, 0, 0, m_rcControl.Right, m_rcControl.Bottom, hDesktopDC, 0, 0, vbSrcCopy    ReleaseDC 0, hDesktopDC        '通过alpha效果进行半透明渲染    UserControl.AutoRedraw = True    AlphaBlend m_hMemDC, 0, 0, m_rcControl.Right, m_rcControl.Bottom, UserControl.hdc, 0, 0, m_rcControl.Right, m_rcControl.Bottom, 5242880    UserControl.AutoRedraw = False    '显示控件    ShowWindow UserControl.hwnd, SW_SHOW        '将渲染后的结果复制到控件中    BitBlt UserControl.hdc, 0, 0, m_rcControl.Right, m_rcControl.Bottom, m_hMemDC, 0, 0, vbSrcCopyEnd SubPrivate Sub UserControl_Paint()    BitBlt UserControl.hdc, 0, 0, m_rcControl.Right, m_rcControl.Bottom, m_hMemDC, 0, 0, vbSrcCopyEnd Sub

然后 ，在FORM中调用即可实现！

private sub form_load()UserControl11.TranslucenceEnd sub