To get a MemoryBlock, do the following.
dim m as new MemoryBlock(4)
#If TargetWindows
m.Long(0) = g.Handle(HandleTypeHDC)
#Elseif TargetMacOS
m.Long(0) = g.Handle(HandleTypeCGrafPtr)
#Endif // Linux not supported
If m.Long(0) = 0 then
//you didn't get a valid handle
End if
m = m.Ptr(0)
Now m points to whatever the handle points to.
You might find chapter 2 of my declares book <http://
www.declareSub.com/> helpful.
Charles Yeomans
On Jul 10, 2006, at 4:10 PM, Phil M wrote:
Is there a way to manipulate/access the individual pixels of a
Picture using the Handle property?
I would like to access the raw picture data with a MemoryBlock, but
I don't know how to convert the pointer returned from the
Graphics.Handle into a MemoryBlock.
Dim g As Graphics = p.Graphics // assume p is passed as
function parameter
Dim m As MemoryBlock
#If TargetWindows
?? = g.Handle(HandleTypeHDC)
#Elseif TargetMacOS
?? = g.Handle(HandleTypeCGrafPtr)
#Endif // Linux not supported
What can I do to get the Handle into a MemoryBlock?
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