Kaverin
Aug 16th, 2001, 02:24 AM
'in a module
Public Declare Function CreateCompatibleBitmap Lib "gdi32" (ByVal hDC As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Public Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Public Declare Function SelectObject Lib "gdi32" (ByVal hDC As Long, ByVal hObject As Long) As Long
'when you need a handle to the bitmap in memoryDC
Dim hBitmap As Long, hDummyBitmap As Long
'make a 1x1 pixel bitmap compatible with the memory DC
hDummyBitmap = CreateCompatibleBitmap(memoryDC, 1, 1)
'put that bitmap into the DC, which causes the handle to the old one to be returned
hBitmap = SelectObject(memoryDC, hDummyBitmap)
'put that bitmap back into the DC
SelectObject memoryDC, hBitmap
'delete the dummy bitmap
DeleteObject hDummyBitmap
'at this point, your DC is unchanged, but you now have the handle to the bitmap that was in it
'hBitmap is the handle
Public Declare Function CreateCompatibleBitmap Lib "gdi32" (ByVal hDC As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Public Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Public Declare Function SelectObject Lib "gdi32" (ByVal hDC As Long, ByVal hObject As Long) As Long
'when you need a handle to the bitmap in memoryDC
Dim hBitmap As Long, hDummyBitmap As Long
'make a 1x1 pixel bitmap compatible with the memory DC
hDummyBitmap = CreateCompatibleBitmap(memoryDC, 1, 1)
'put that bitmap into the DC, which causes the handle to the old one to be returned
hBitmap = SelectObject(memoryDC, hDummyBitmap)
'put that bitmap back into the DC
SelectObject memoryDC, hBitmap
'delete the dummy bitmap
DeleteObject hDummyBitmap
'at this point, your DC is unchanged, but you now have the handle to the bitmap that was in it
'hBitmap is the handle