如何用VB编制半透明窗体
编号：QA004470
建立日期: 2001年10月22日 最后修改日期：2003年8月24日
所属类别：
Ｑ
熏:
操作系统：windows 2000
编程工具：vb 6.0
问题：如何用vb编制半透明窗体？ 要用到win32 API 的什么函数？不用bitblt函数能实现吗？
水平: 刚入门
Ａ回答:
说明：表单一个Form1，图片框一个PicShape，在图片框内放置任何图片时，系统将使用图片框中的图片为窗体，并且屏蔽图片中白色部分，从而建立特效的变形窗体。
Option Explicit
Dim MoveTrue As Boolean, OldX As Long, OldY As Long
Private Type BITMAP
bmType As Long
bmWidth As Long
bmHeight As Long
bmWidthBytes As Long
bmPlanes As Integer
bmBitsPixel As Integer
bmBits As Long
End Type
Private Declare Function GetBitmapBits Lib "gdi32" (ByVal hBitmap As Long, ByVal dwCount As Long, lpBits As Any) As Long
Private Declare Function GetObject Lib "gdi32" Alias "GetObjectA" (ByVal hObject As Long, ByVal nCount As Long, lpObject As Any) As Long
Private Declare Function CreateRectRgn Lib "gdi32" (ByVal x1 As Long, ByVal y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Declare Function CombineRgn Lib "gdi32" (ByVal hDestRgn As Long, ByVal hSrcRgn1 As Long, ByVal hSrcRgn2 As Long, ByVal nCombineMode As Long) As Long
Private Declare Function SetWindowRgn Lib "user32" (ByVal hWnd As Long, ByVal hRgn As Long, ByVal bRedraw As Long) As Long
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Private Sub FitToPicture()
Const RGN_OR = 2
Dim border_width As Single
Dim title_height As Single
Dim bm As BITMAP
Dim bytes() As Byte
Dim ints() As Integer
Dim longs() As Long
Dim R As Integer
Dim C As Integer
Dim start_c As Integer
Dim stop_c As Integer
Dim x0 As Long
Dim y0 As Long
Dim combined_rgn As Long
Dim new_rgn As Long
Dim offset As Integer
Dim colourDepth As Integer
ScaleMode = vbPixels
picShape.ScaleMode = vbPixels
picShape.AutoRedraw = True
picShape.Picture = picShape.Image
' 获取窗体的边框大小
border_width = (ScaleX(Width, vbTwips, vbPixels) - ScaleWidth) / 2
title_height = ScaleX(Height, vbTwips, vbPixels) - border_width - ScaleHeight
' 获取图片大小
x0 = picShape.Left + border_width
y0 = picShape.Top + title_height
'给出图片信息
GetObject picShape.Image, Len(bm), bm
Select Case bm.bmBitsPixel
Case 15, 16:
'MsgBox _
"图片框中图片的颜色大高。",vbExclamation + vbOKOnly
colourDepth = 2
' 分配空格给图片.
ReDim ints(0 To bm.bmWidthBytes \ 2 - 1, 0 To bm.bmHeight - 1)
' 给出图片表面数据
GetBitmapBits picShape.Image, bm.bmHeight * bm.bmWidthBytes, ints(0, 0)
' 建立表单区域
For R = 0 To bm.bmHeight - 2
C = 0
Do While C < bm.bmWidth
start_c = 0
stop_c = 0
' 查找白色区域,屏蔽
Do While C < bm.bmWidth
If (ints(C, R) And &H7FFF) <> &H7FFF Then Exit Do
C = C + 1
Loop
start_c = C
Do While C < bm.bmWidth
If (ints(C, R) And &H7FFF) = &H7FFF Then Exit Do
C = C + 1
Loop
stop_c = C
If start_c < bm.bmWidth Then
If stop_c >= bm.bmWidth Then stop_c = bm.bmWidth - 1
new_rgn = CreateRectRgn(start_c + x0, R + y0, stop_c + x0, R + y0 + 1)
If combined_rgn = 0 Then
combined_rgn = new_rgn
Else
CombineRgn combined_rgn, combined_rgn, new_rgn, RGN_OR
DeleteObject new_rgn
End If
End If
Loop
Next R
Case 24:
colourDepth = 3
ReDim bytes(0 To bm.bmWidthBytes - 1, 0 To bm.bmHeight - 1)
GetBitmapBits picShape.Image, bm.bmHeight * bm.bmWidthBytes, bytes(0, 0)
For R = 0 To bm.bmHeight - 2
' Create a region for this row.
C = 0
Do While C < bm.bmWidth
start_c = 0
stop_c = 0
offset = C * colourDepth
Do While C < bm.bmWidth
If bytes(offset, R) <> 255 Or _
bytes(offset + 1, R) <> 255 Or _
bytes(offset + 2, R) <> 255 Then Exit Do
C = C + 1
offset = offset + colourDepth
Loop
start_c = C
Do While C < bm.bmWidth
If bytes(offset, R) = 255 And _
bytes(offset + 1, R) = 255 And _
bytes(offset + 2, R) = 255 _
Then Exit Do
C = C + 1
offset = offset + colourDepth
Loop
stop_c = C
If start_c < bm.bmWidth Then
If stop_c >= bm.bmWidth Then stop_c = bm.bmWidth - 1
' 建立区域
new_rgn = CreateRectRgn(start_c + x0, R + y0, stop_c + x0, R + y0 + 1)
If combined_rgn = 0 Then
combined_rgn = new_rgn
Else
CombineRgn combined_rgn, combined_rgn, new_rgn, RGN_OR
DeleteObject new_rgn
End If
End If
Loop
Next R
Case 32:
colourDepth = 4
ReDim longs(0 To bm.bmWidthBytes \ 4 - 1, 0 To bm.bmHeight - 1)
GetBitmapBits picShape.Image, bm.bmHeight * bm.bmWidthBytes, longs(0, 0)
For R = 0 To bm.bmHeight - 2
C = 0
Do While C < bm.bmWidth
start_c = 0
stop_c = 0
Do While C < bm.bmWidth
If (longs(C, R) And &HFFFFFF) <> &HFFFFFF Then Exit Do
C = C + 1
Loop
start_c = C
Do While C < bm.bmWidth
If (longs(C, R) And &HFFFFFF) = &HFFFFFF Then Exit Do
C = C + 1
Loop
stop_c = C
If start_c < bm.bmWidth Then
If stop_c >= bm.bmWidth Then stop_c = bm.bmWidth - 1
new_rgn = CreateRectRgn(start_c + x0, R + y0, stop_c + x0, R + y0 + 1)
If combined_rgn = 0 Then
combined_rgn = new_rgn
Else
CombineRgn combined_rgn, combined_rgn, new_rgn, RGN_OR
DeleteObject new_rgn
End If
End If
Loop
Next R
Case Else
MsgBox "对不起，程序必须在 16位, 24-位 或 32-位 颜色下。", _
vbExclamation + vbOKOnly
Exit Sub
End Select
' 设置表单外观为建立区域
SetWindowRgn hWnd, combined_rgn, True
DeleteObject combined_rgn
End Sub
Private Sub picShape_Click()
End Sub
Private Sub Form_Load()
Move (Screen.Width - Width) / 2, (Screen.Height - Height) / 2
FitToPicture
End Sub
Private Sub picShape_DblClick()
Unload Me
End Sub
Private Sub picshape_MouseDown(Button As Integer, Shift As Integer, x As Single, y As Single)
MoveTrue = True
OldX = x: OldY = y
End Sub
Private Sub picshape_MouseMove(Button As Integer, Shift As Integer, x As Single, y As Single)
If MoveTrue = True Then
Form1.Left = Form1.Left + x - OldX
Form1.Top = Form1.Top + y - OldY
End If
End Sub
Private Sub picshape_MouseUp(Button As Integer, Shift As Integer, x As Single, y As Single)
MoveTrue = False
End Sub
影子的意见：
（主持人注：下面的方法仅适用于Windows 2000/XP或更新版本，因为SetLayeredWindowAttributes函数在其他系统中不支持。）
Public Sub NTSetfrmRgn(PicBox As PictureBox, frm As Form)
'-------------------------------------------------
' 窗体形状及透明度
' Color (取得0,0处象素的颜色,即要裁减的区域的颜色
' SetLayeredWindowAttributes 设置透明度及窗体形状
'-------------------------------------------------
Dim WindowExs As Long, Color As Long
frm.Picture = PicBox.Picture
Color = GetPixel(PicBox.hdc, 0, 0)
WindowExs = GetWindowLong(frm.hwnd, GWL_EXSTYLE)
WindowExs = WindowExs Or WS_EX_LAYERED
SetWindowLong frm.hwnd, GWL_EXSTYLE, WindowExs
'If blnok Then
SetLayeredWindowAttributes frm.hwnd, Color, 180, LWA_COLORKEY Or LWA_ALPHA
'Else
'SetLayeredWindowAttributes frm.hWnd, Color, 112, LWA_COLORKEY Or LWA_ALPHA
'End If
End Sub
具体方法我这里有一个例子？ 也可去 http://vbcc.126.com 看看
Tianjie Mao的意见：
其实，如果你用VB .NET，就不用这么辛苦去动用API Text Viewer了。
方法：
在需要应用的地方插入FormObject.Obacity = <不透明度>
把FormObject改为窗体的对象名即可。
例子：
Me.Obacity = 0.5 '设置不透明度为50%
此问题由cwap回答。
附加关键字：编程, 源程序, programming, source code, Visual Basic, VB, 窗体与菜单, form, window, tform, Windows API, win32, api, windows api, gdi32, kernel。
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