How to know which function get called in DllCall ?

[kcvinu]

Hi all, 

Please see this code.

Local $aCall = DllCall($__g_hGDIPDll, "int", "GdipLoadImageFromFile", "wstr", $sFileName, "handle*", 0)

In this code, how do I know the function name getting called ? Is it Bitmap::FromFile ?

Edited November 6, 2023 by kcvinu

[TheDcoder]

Just now, kcvinu said:

In this code, how do I know that the function name getting called ?

It's the 3rd parameter in the call, isn't it? "GdipLoadImageFromFile"

Or maybe I misunderstood your question.

[kcvinu]

Yes, you misunderstood. No problem. The third param is GdipLoadImageFromFile. There is no such function in Gdiplus. But the Bitmap class had a method "FromFile". 

[kcvinu]

@TheDcoder, Actually, I am trying to add a feature in my GUI lib for D lang. I want to add JPEG images to my ImageList. It receives only an HBITMAP. So I need to use GDI plus.  Well, it's been a long while and now I read about your own programming lang. Best wishes for your endeavor.  There is still scope for a good basic style language. 

Edited June 4, 2022 by kcvinu

[TheDcoder]

20 minutes ago, kcvinu said:

The third param is GdipLoadImageFromFile. There is no such function in Gdiplus.

You can find the function documented here: https://docs.microsoft.com/en-us/windows/win32/gdiplus/-gdiplus-image-flat

20 minutes ago, kcvinu said:

But the Bitmap class had a method "FromFile".

I am pretty sure that Windows API only uses C and it doesn't have classes or methods... but, maybe GDI+ is different, I am not familiar with it.

I guess you'll just have to wait for someone else to answer your question

[kcvinu]

@TheDcoder, Thanks a lot. Fortunately, I found this with the help of a guy from D lang community. 
The Image class & Bitmap class are a wrapper of this C functions. And MS is warning us to use the flat api funcs. 
Edit : - But if I read your comment yesterday, I could have saved a lot of time. 

Edited June 5, 2022 by kcvinu

[TheDcoder]

@kcvinu No worries, glad that you were able to figure it out

23 hours ago, kcvinu said:

Well, it's been a long while and now I read about your own programming lang. Best wishes for your endeavor.  There is still scope for a good basic style language. 

Thank you!