ImageList_Add does not necessarily require the handle to two bitmaps whereas
ImageList_AddMasked probably does require the two parameters.

The documentation for ImageList_Add states:
hbmMask [in, optional]
HBITMAP
A handle to the bitmap that contains the mask. If no mask is used with the
image list, this parameter is ignored. This parameter can be NULL.

I am passing it NULL and it remains unclear where the fault is.

The specific difference between these two functions is also unclear.
Possibly it relates to how the masking applies.

Anyway, I shall play further this evening and try to unravel some of the
mysteries ...

Douglas

----- Original Message -----
From: "Mike Ghan" <MikeGhan_at_logix-controls.com>
To: <sftalk_at_forth.com>
Sent: Thursday, May 06, 2010 5:13 PM
Subject: [sftalk] Re: Image List

>
> Yes, you can add images (or icons) to the image list one at a time.
> ImageList_AddMasked returns the index# of the added image. Since I load
> the bitmap file during compilation, it's easier to load a single file.
>
> PNG files (or any other format) will need to be converted to the BMP
> format. The simple Paint program supplied with Windows can Save As into
> the BMP format.
>
> ImageList_Add requires the handle to two bitmaps, one the image, the
> other a mask. ImageList_AddMask requires a single image bitmap handle
> plus a mask (background) color. It then derives the mask bitmap from
> the image bitmap.
>
> Lastly, as SwiftForth is not compiled from scratch, there is no support
> for "resources". There are other ways to access items normally stored
> in the resource area. For example, ExtractIcon can be used for icon
> files.
>
> Mike
>
> -----Original Message-----
> From: sftalk-bounce_at_forth.com [mailto:sftalk-bounce_at_forth.com] On Behalf
> Of Douglas Reid
> Sent: Thursday, May 06, 2010 8:49 AM
> To: sftalk_at_forth.com
> Subject: [sftalk] Re: Image List
>
> Thanks, Mike.
>
> This looks like a reasonable approach.
> It is interesting how you use a single bit map consisting of multiple=20
> images.
> I shall try it this evening.
> (First I have to think about how to actually produce such composite
> images=20
> ...)
>
> My approach was based on using potentially multiple calls to
> ImageList_Add=20
> (although only 1 shown in my example) to load a series of files .bmp,
> .ico=20
> or whatever.
> In that respect, my approach (which is that seen in most of the MSDN and
>
> other C examples) is useful.
> The programme would only need to deal with each single small image at a
> time=20
> rather than dealing with a potentially large bmp file.
> Each of the many image or icon source files could potentially have
> different=20
> characteristics that could be passed/ dealt with in the file upload
> process.
>
> For example, (just for fun!) I was going to try to use a collection of=20
> country flags I found on the web.
> They are provided as UK.png, US.png, etc. [I hope png format will be
> okay=20
> ... ?! Maybe these Windows functions convert them to a bmp bit map?]
> I already have countries and codes in a tabular list so was intending to
>
> process for each country in turn
>
> 200 0 DO ... ImageList_Add ... LOOP
>
> No doubt it is possible, with some thought, to first create the large
> bmp=20
> file based on all the countries programmatically and then use your
> approach=20
> to upload them in one go. However, doing that programmatically would=20
> require a similar approach to what isn't working - i.e., using multiple=20
> calls of LoadImage and ImageList_Add.
>
> The question remains as to what is wrong with my code.
>
> My use of LoadImage (or the more specific/ older LoadIcon/ LoadBitmap=20
> variants) has the same objective as your step 4.
> 4) Get a handle to your bitmap file
>
> The handle is hImage in my code example
> By this step, I am seeing large numbers that appear to be handles
>
> Failure (-1 returned) is only seen at the next step when ImageList_Add
> is=20
> used.
>
> Actually, ImageList_Add and ImageList_AddMasked appear very similar -=20
> apparently both can be used with 1 or more images.
> So, there is little difference between our approaches - apart from the
> fact=20
> that mine isn't working :-(
>
> The other open question remaining is the use of standard resources -
> i.e.,=20
> how to load pre-defined system icons.
>
> Also, how does one create own resources such as was done to produce the=20
> SwiftForth icon that can be used as a component in any programme simply
> by=20
> referring to them as a number
> NULL 101 LoadIcon
>
> What is the approach used to associate constants with own icons?
>
> Best Regards,
> Douglas
>
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Received on Thu May 06 2010 - 09:35:45 PDT