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Problem to create a big memory DC !

I'm writing a timeline application with different horizontal resolution. The timeline is greated in memory and then the portion that must be visible is BitBlt on the screen. A problem occures when I select a big resolution (for example 30 minutes steps or 3 minutes steps).

30 minutes example, must generate a bitmap of 34507 * 100 * X pixels => bitmap handle is NULL.( X = 1 to 8)

3 minutes example, must generate a bitmap of 5751 * 100 * X pixels => bitmap handle is NULL. (X = 1 to 8)

This bitmap is the selected in the memory DC.

Did someone has an idea to generate a big memory DC ?

Hi mike_marquet,

only thing I can image which is guaranteed to work is to split the graph ... I'm even sure that you'll get problems with some specific graphic cards with such large bitmaps/memory DCs, because I once had a problem that selecting a 4000x32 or larger bitmap caused a blue screen in NT i.e. on a IBM ThinkPad.

So, I would suggest to use a list of bitmaps with a fixed length.

ZOPPO

ASKER

OK, when no other solution possible.

Unfortunately I don't know another one ... but you should wait a while for other expert's comments

Why do you want to generate the whole timeline in the memory bitmap? Can't you draw only the part which is visible?

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ASKER

Yes, I will do it so. But it was much simple to draw the entire timeline in memory and BitBlt the part I wanted.

> But it was much simple to draw the entire timeline in memory and BitBlt the part I wanted.

Well, no--it wasn't. That approach left you with problems you couldn't possibly solve.

..B ekiM

mike_marquet,

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Netminder
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Deletion rejected.

Sometimes "you can't" is, in fact the correct answer. Comment force/accepted as answer.

Netminder
CS Moderator, EE