'Dieser Source stammt von http://www.activevb.de
'und kann frei verwendet werden. Für eventuelle Schäden
'wird nicht gehaftet.
'
'Um Fehler oder Fragen zu klären, nutzen Sie bitte unser Forum.
'Ansonsten viel Spaß und Erfolg mit diesem Source!
'Code von Benjamin Wilger
'Benjamin@ActiveVB.de
'Copyright (C) 2001
Option Explicit
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 GetPixel Lib "gdi32" (ByVal hDC As Long, ByVal x As Long, ByVal y 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 DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Private Declare Function SetWindowRgn Lib "user32" (ByVal hWnd As Long, ByVal hRgn As Long, ByVal bRedraw As Boolean) As Long
Private Const RGN_OR As Long = 2&
Private Declare Sub OleTranslateColor Lib "oleaut32.dll" ( _
ByVal clr As Long, _
ByVal hpal As Long, _
ByRef lpcolorref As Long)
Private Type BITMAPINFOHEADER
biSize As Long
biWidth As Long
biHeight As Long
biPlanes As Integer
biBitCount As Integer
biCompression As Long
biSizeImage As Long
biXPelsPerMeter As Long
biYPelsPerMeter As Long
biClrUsed As Long
biClrImportant As Long
End Type
Private Type RGBQUAD
rgbBlue As Byte
rgbGreen As Byte
rgbRed As Byte
rgbReserved As Byte
End Type
Private Type BITMAPINFO
bmiHeader As BITMAPINFOHEADER
bmiColors As RGBQUAD
End Type
Private Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hDC As Long) As Long
Private Declare Function CreateDIBSection Lib "gdi32" (ByVal hDC As Long, pBitmapInfo As BITMAPINFO, ByVal un As Long, ByVal lplpVoid As Long, ByVal handle As Long, ByVal dw As Long) As Long
Private Declare Function SelectObject Lib "gdi32" (ByVal hDC As Long, ByVal hObject As Long) As Long
Private 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 Long
Private Declare Function GetDIBits Lib "gdi32" (ByVal aHDC As Long, ByVal hBitmap As Long, ByVal nStartScan As Long, ByVal nNumScans As Long, lpBits As Any, lpBI As BITMAPINFO, ByVal wUsage As Long) As Long
Private Declare Function DeleteDC Lib "gdi32" (ByVal hDC As Long) As Long
Private Const BI_RGB As Long = 0&
Private Const DIB_RGB_COLORS As Long = 0&
Private Declare Function GetModuleHandle Lib "kernel32" Alias "GetModuleHandleA" (ByVal lpModuleName As String) As Long
Private Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long
Private Declare Function GetProcAddress Lib "kernel32" (ByVal hModule As Long, ByVal lpProcName As String) As Long
Private Declare Function FreeLibrary Lib "kernel32" (ByVal hLibModule As Long) As Long
Private Const LWA_COLORKEY As Long = &H1&
Private Const GWL_EXSTYLE As Long = (-20&)
Private Const WS_EX_LAYERED As Long = &H80000
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private 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 WM_NCLBUTTONDOWN As Long = &HA1&
Public Const HTCAPTION As Long = 2&
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Public Declare Function ReleaseCapture Lib "user32" () As Long
Public Function MakeFormTransparent(frm As Form, ByVal lngTransColor As Long)
Dim hRegion As Long
Dim WinStyle As Long
'Systemfarben ggf. in RGB-Werte übersetzen
If lngTransColor < 0 Then OleTranslateColor lngTransColor, 0&, lngTransColor
'Ab Windows 2000/98 geht das relativ einfach per API
'Mit IsFunctionExported wird geprüft, ob die Funktion
'SetLayeredWindowAttributes unter diesem Betriebsystem unterstützt wird.
If IsFunctionExported("SetLayeredWindowAttributes", "user32") Then
'Den Fenster-Stil auf "Layered" setzen
WinStyle = GetWindowLong(frm.hWnd, GWL_EXSTYLE)
WinStyle = WinStyle Or WS_EX_LAYERED
SetWindowLong frm.hWnd, GWL_EXSTYLE, WinStyle
SetLayeredWindowAttributes frm.hWnd, lngTransColor, 0&, LWA_COLORKEY
Else 'Manuell die Region erstellen und übernehmen
hRegion = RegionFromBitmap(frm, lngTransColor)
SetWindowRgn frm.hWnd, hRegion, True
DeleteObject hRegion
End If
End Function
Private Function RegionFromBitmap(picSource As Object, ByVal lngTransColor As Long) As Long
Dim lngRetr As Long, lngHeight As Long, lngWidth As Long
Dim lngRgnFinal As Long, lngRgnTmp As Long
Dim lngStart As Long
Dim x As Long, y As Long
Dim hDC As Long
Dim bi24BitInfo As BITMAPINFO
Dim iBitmap As Long
Dim BWidth As Long
Dim BHeight As Long
Dim iDC As Long
Dim PicBits() As Byte
Dim Col As Long
Dim OldScaleMode As ScaleModeConstants
OldScaleMode = picSource.ScaleMode
picSource.ScaleMode = vbPixels
hDC = picSource.hDC
lngWidth = picSource.ScaleWidth '- 1
lngHeight = picSource.ScaleHeight - 1
BWidth = (picSource.ScaleWidth \ 4) * 4 + 4
BHeight = picSource.ScaleHeight
'Bitmap-Header
With bi24BitInfo.bmiHeader
.biBitCount = 24
.biCompression = BI_RGB
.biPlanes = 1
.biSize = Len(bi24BitInfo.bmiHeader)
.biWidth = BWidth
.biHeight = BHeight + 1
End With
'ByteArrays in der erforderlichen Größe anlegen
ReDim PicBits(0 To bi24BitInfo.bmiHeader.biWidth * 3 - 1, 0 To bi24BitInfo.bmiHeader.biHeight - 1)
iDC = CreateCompatibleDC(hDC)
'Gerätekontextunabhängige Bitmap (DIB) erzeugen
iBitmap = CreateDIBSection(iDC, bi24BitInfo, DIB_RGB_COLORS, ByVal 0&, ByVal 0&, ByVal 0&)
'iBitmap in den neuen DIB-DC wählen
Call SelectObject(iDC, iBitmap)
'hDC des Quell-Fensters in den hDC der DIB kopieren
Call BitBlt(iDC, 0, 0, bi24BitInfo.bmiHeader.biWidth, bi24BitInfo.bmiHeader.biHeight, hDC, 0, 0, vbSrcCopy)
'Gerätekontextunabhängige Bitmap in ByteArrays kopieren
Call GetDIBits(hDC, iBitmap, 0, bi24BitInfo.bmiHeader.biHeight, PicBits(0, 0), bi24BitInfo, DIB_RGB_COLORS)
'Wir brauchen nur den Array, also können wir die Bitmap direkt wieder löschen.
'DIB-DC
Call DeleteDC(iDC)
'Bitmap
Call DeleteObject(iBitmap)
lngRgnFinal = CreateRectRgn(0, 0, 0, 0)
For y = 0 To lngHeight
x = 0
Do While x < lngWidth
Do While x < lngWidth And _
RGB(PicBits(x * 3 + 2, lngHeight - y + 1), _
PicBits(x * 3 + 1, lngHeight - y + 1), _
PicBits(x * 3, lngHeight - y + 1) _
) = lngTransColor
x = x + 1
Loop
If x <= lngWidth Then
lngStart = x
Do While x < lngWidth And _
RGB(PicBits(x * 3 + 2, lngHeight - y + 1), _
PicBits(x * 3 + 1, lngHeight - y + 1), _
PicBits(x * 3, lngHeight - y + 1) _
) <> lngTransColor
x = x + 1
Loop
If x + 1 > lngWidth Then x = lngWidth
lngRgnTmp = CreateRectRgn(lngStart, y, x, y + 1)
lngRetr = CombineRgn(lngRgnFinal, lngRgnFinal, lngRgnTmp, RGN_OR)
DeleteObject lngRgnTmp
End If
Loop
Next
picSource.ScaleMode = OldScaleMode
RegionFromBitmap = lngRgnFinal
End Function
'Code von vbVision:
'Diese Funktion überprüft, ob die angegebene Function von einer DLL exportiert wird.
Private Function IsFunctionExported(ByVal sFunction As String, ByVal sModule As String) As Boolean
Dim hMod As Long, lpFunc As Long, bLibLoaded As Boolean
'Handle der DLL erhalten
hMod = GetModuleHandle(sModule)
If hMod = 0 Then 'Falls DLL nicht registriert ...
hMod = LoadLibrary(sModule) 'DLL in den Speicher laden.
If hMod Then bLibLoaded = True
End If
If hMod Then
If GetProcAddress(hMod, sFunction) Then IsFunctionExported = True
End If
If bLibLoaded Then Call FreeLibrary(hMod)
End Function
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