BmpBitsSize returns the correct value
But after I do a memcpy, it overwrites the value:
ptr = (unsigned char *) BmpGetBits(bmp);
size = BmpBitsSize(bmp);
memcpy(ptr,myarray,size);
"DeAnna Davidson" <[EMAIL PROTECTED]> wrote in message
news:30210@palm-dev-forum...
>
> <caveat> I've not actually used it before so I may not be right. </caveat>
> According to the docs, the bitmap created with BmpCreate contains no data.
> I'm not sure if that means it doesn't allocate any memory for the data or
> just that there is nothing there. The easiest way to find out is to use
> BmpBitsSize and see if it actually returns the number you think it should.
> Logically, if it returns zero, then no, it doesn't allocate the memory.
> Either way, you should still probably be using BmpBitsSize to get the
limits
> for the buffer so you know when to stop modifying things.
>
> DeAnna
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of
> > [EMAIL PROTECTED]
> > Sent: Wednesday, November 15, 2000 12:25 PM
> > To: Palm Developer Forum
> > Subject: BmpCreate and memory corruption
> >
> >
> > Thanks for everyone's help on the previous related post - I am able to
> > display runtime bitmaps now.
> >
> > I have another question.
> >
> > Does BmpCreate allocate the memory needed for the bitmap data?
> >
> >
> > i.e., when I do a
> >
> > bmp = BmpCreate(10,10,8,NULL,error);
> >
> > does it allocate 100 bytes at the end of the header for the
> > bitmap data?
> > or do I have to manually allocate the memory?
> >
> > I'm finding that if I use BmpGetBits to retrieve the bitmap
> > data pointer
> > and then modify the contents, I corrupt some of the local
> > variables in the
> > same function.
> >
> >
> >
> >
> >
> >
> > --
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>
>
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