YoungBuck

Code:

---

dim a as long
  dim dc as long
  dim temp as ipicturedisp
  dim orig as Long

  for a=0 to 100
      'Load
      dc = createcompatibledc(me.hdc)
      set temp=loadpicture("c:\test.bmp")
      ' get handle to original bitmap created with DC
      orig = selectobject(dc, temp)

      'Release
      ' put the original bitmap back into the DC
      selectobject dc, orig
      ' delete the bitmap that was created
      deleteobject temp
      ' free the DC's resources
      deletedc dc

  next

---

Do I really need to keep the Temp picture alive until I shutdown the game??

Nope.

I think you can delete the bitmap out of the DC at anytime.

So all you need to do is Delete the bitmap before putting another one into the DC

Sounds weird, it's your choise fox, what do you need the bitmap for?

I just neet the bitmap to get the DC... therefore everything in my original code worked fine, excepting the memory leak..

Ok let me ask the question the other way around:

What is the correct code to load a bitmap into memory, get it's DC, release everything excepting the DC (which I use in the program) and when done release the DC, too.?

Code:

---

dim a as long
  dim dc as long
  dim temp as ipicturedisp
  dim orig as Long

  dc = createcompatibledc(me.hdc)

  for a=0 to 100
      'Load
      set temp=loadpicture("c:\test.bmp")
      ' get handle to original bitmap created with DC
      orig = selectobject(dc, temp)

      'Release
      ' put the original bitmap back into the DC
      selectobject dc, orig
      ' delete the bitmap that was created
      deleteobject temp
     
  next

  ' free the DC's resources
      deletedc dc

---

there

Thanks :)

Maybe you'll all get into the credits when I'm done ;)

Quote:

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Originally posted by Fox
I just neet the bitmap to get the DC... therefore everything in my original code worked fine, excepting the memory leak..

Ok let me ask the question the other way around:

What is the correct code to load a bitmap into memory, get it's DC, release everything excepting the DC (which I use in the program) and when done release the DC, too.?

---

Ok you must have missunderstood something here.
DC are not something you get from bitmaps, or more specifically Device Independent Bitmaps (DIB), they are interfaces for screen or ofscreen graphical areas which GDI uses as handles for performing graphical operations on (like drawing and blitting), the offscreen device you need to handle blits from a DIB is created from the GDI with CreatecompatibleDC not retrieved from the bitmap.

Now I suppose you need the bitmap for something right, you need to blit from it say, you attach it to the offscreen DC using selectobject. Then you won't need it anymore, you detach it by calling selectobject again without passing a handle and the DC should be null, if you want to attach another bitmap, pass it's handle with selectobject instead. Selectobject will return the old handle which you have to deleteobject, that is if you don't need it anymore. DeleteDC is used to delete the DC when everything is done.

You need to keep the orig variable and Select it back into the DC before calling DeleteDC, in other words the same objects that were created along with the DC need to be Selected back into it before you call DeleteDC (Bitmaps, Pens, Brushes).

Ok, think I got it ... more or less.