On Jul 10, 2006, at 6:38 PM, Phil M wrote:
On Jul 10, 2006, at 4:47 PM, Charles Yeomans wrote:
Is there a way to manipulate/access the individual pixels of a
Picture using the Handle property?
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.
Thank you. Now I just need to learn how a CGrafPtr works... do you
have any references on the structure/format of CGrafPtr?
Sure. See http://developer.apple.com/. A CGrafPtr is a pointer to a
CGrafPort struct. In it you'll find the portPixMap field, which is a
PixMapHandle. That's a handle to a PixMap struct, which appears to
contain a pointer to the raw bytes. Have fun.
Charles Yeomans
_______________________________________________
Unsubscribe or switch delivery mode:
<http://www.realsoftware.com/support/listmanager/>
Search the archives of this list here:
<http://support.realsoftware.com/listarchives/lists.html>
