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nend

_GDIPlus_BitmapCreateFromMemory dispose???[SOLVED]

9 posts in this topic

#1 ·  Posted (edited)

Hi All,

 

In the help file at "_GDIPlus_BitmapCreateFromMemory" there are a contradictory with the dispose of this data.

At the remarks it said After you are done with the object, call _GDIPlus_ImageDispose() to release the object resources.

And in the example below it said:

 Local $hBitmap = _GDIPlus_BitmapCreateFromMemory(BinGIFImage()) 

 

  _GDIPlus_BitmapDispose($hBitmap)

So wich is the right one the image dispose or the bitmap dispose or are both right?

Edited by nend

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Ok thanks for the reply, if I understand it correct the Bitmapdispose is the right one?

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It's the proper one to use. This should be submitted to the bug tracker and have the help file altered to

" After you are done with the object, call _GDIPlus_BitmapDispose() to release the object resources. " to avoid confusion like this.

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Either one can be used, the two functions are identical. The only difference is in the descriptions for them, in the BitmapDispose function the help file refers to the parameter as the handle to the bitmap, and in ImageDispose it calls it the handle to the image. Other than the wording, they're identical.

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Ah I see, Brew is right. From the GDIPlus.au3

Func _GDIPlus_ImageDispose($hImage)
    Local $aResult = DllCall($__g_hGDIPDll, "int", "GdipDisposeImage", "handle", $hImage)
    If @error Then Return SetError(@error, @extended, False)
    If $aResult[0] Then Return SetError(10, $aResult[0], False)

    Return True
EndFunc   ;==>_GDIPlus_ImageDispose

Func _GDIPlus_BitmapDispose($hBitmap)
    Local $aResult = DllCall($__g_hGDIPDll, "int", "GdipDisposeImage", "handle", $hBitmap)
    If @error Then Return SetError(@error, @extended, False)
    If $aResult[0] Then Return SetError(10, $aResult[0], False)

    Return True
EndFunc   ;==>_GDIPlus_BitmapDispose

I'd still argue to use BitmapDispose and have the help file altered. If not replacing with BitmapDispose then changing to " call _GDIPlus_BitmapDispose() or _GDIPlus_ImageDispose() to release..."

I'd still argue to use BitmapDispose, to avoid confusion (for those of us who didn't know that the functions are exactly the same) and keep the code consistent. Keeping code consistent and logical is very important.

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Pay attention when you use

Local $hBitmap = _GDIPlus_BitmapCreateFromMemory(BinGIFImage(), True)

The returned handle is not a GDIPlus (GDI+) handle but a GDI handle. Thus you must use 

_WinAPI_DeleteObject($hBitmap)

to release the resource!


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I personally would get rid of the BitmapDispose function and tell everyone to use the ImageDispose function exclusively. After all, the function you're calling is called GdipDisposeImage and not GdipDisposeBitmap. Just reword the helpfile to reflect what you need to pass the function when used.


If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.
Give a programmer the correct code and he can do his work for a day. Teach a programmer to debug and he can do his work for a lifetime - by Chirag Gude
How to ask questions the smart way!

I hereby grant any person the right to use any code I post, that I am the original author of, on the autoitscript.com forums, unless I've specifically stated otherwise in the code or the thread post. If you do use my code all I ask, as a courtesy, is to make note of where you got it from.

Back up and restore Windows user files _Array.au3 - Modified array functions that include support for 2D arrays.  -  ColorChooser - An add-on for SciTE that pops up a color dialog so you can select and paste a color code into a script.  -  Customizable Splashscreen GUI w/Progress Bar - Create a custom "splash screen" GUI with a progress bar and custom label.  -  _FileGetProperty - Retrieve the properties of a file  -  SciTE Toolbar - A toolbar demo for use with the SciTE editor  -  GUIRegisterMsg demo - Demo script to show how to use the Windows messages to interact with controls and your GUI.  -   Latin Square password generator

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#9 ·  Posted (edited)

I'm still confused your are all autoit expert but UEZ (GDI wizard) says to use _winapi_deleteobject BrewManNH said to use GDIdisposeImage.

Are they both ok to use?

Edit:

Ok I see what UEZ meant I'ts all clear, thanks guys for you help

Edited by nend

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