On Feb 23, 2006, at 4:25 PM, Mike Woodworth wrote:
On Feb 23, 2006, at 12:33 PM, Charles Yeomans wrote:
type = pixmap.OSTypeMBS(60) is returning a strange value because 60
isn't the right offset; I compute it to be 38. A PixMap struct is 50
bytes.
As for baseaddr.StringValue(0,1024), you might try creating a Picture
object and set the pixels to known values, then poke around and if
you can find them using these functions.
of course you're right on the size... i've spent too much time playing
with singles recently, and I read all the shorts as singles. grm.
anyways... still cant get a reasonable result for the ostype, it seems
MBS always returns "". so i wrote my own little function to do it...
Function LongToOSType(Long as Integer) As string
Dim s As String
dim m as new MemoryBlock(4)
m.Long(0) = Long
s = Encodings.MacRoman.CHR(m.Byte(0))
+Encodings.MacRoman.CHR(m.Byte(1)) + Encodings.MacRoman.CHR(m.Byte(2))
+ Encodings.MacRoman.CHR(m.Byte(3))
Return s
End Function
still im getting gibberish for the pixeltype. i was hoping to see
this work before i start digging around in the baseaddr more, but i'm
starting to wonder if RB isnt properly setting it?
I don't think the problem is with Rb. First, GetGWorldPixMap returns a
PixMapHandle. So to get at the PixMap, you need to perform an
additional dereference.
dim pixmapHandle as MemoryBlock = GetGWorldPixMap(cgrafptr)
dim pixMapPointer as MemoryBlock = pixmapHandle.Ptr(0)
Now, the pixelFormat field is indeed at offset 38; inspection reveals
its integer value (for a JPEG file I opened) to be 32. That certainly
does not look like a FourCharCode, and in fact it's not. To figure out
what it means, you turn to the header file QuickDraw.h, from which we
learn that some basic pixel formats are represented not as
FourCharCodes, but as integers. Here, 32 = k32ARGBPixelFormat. I
assume that this is a standard Mac format.
--------------
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>
