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Question about Prototypes and calling a function
Posted: Fri Apr 05, 2019 4:57 pm
by jacky
Hi,
I want to be able to call this function from shell32.dll: SHParseDisplayName
https://docs.microsoft.com/en-us/window ... isplayname
I'm trying it like this and the program crashes when I execute it
Code: Select all
Prototype.i ProtoSHParseDisplayName(pszName.p-unicode, *pbc, *ppidl, sfgaoIn.i, *psfgaoOut)
Define.i hShell32DLL
Define SHParseDisplayName.ProtoSHParseDisplayName
hShell32DLL = OpenLibrary(#PB_Any, "Shell32.dll")
If hShell32DLL
SHParseDisplayName.ProtoSHParseDisplayName = GetFunction(hShell32DLL, "SHParseDisplayName")
EndIf
Define *pidl.ITEMIDLIST
hResult = SHParseDisplayName("R:\test_folders\00001", 0, *pidl, 0, 0)
If hResult = #S_OK
Debug "OK!"
EndIf
I'm obviously doing it wrong, can anybody tell me how to do it right?
Re: Question about Prototypes and calling a function
Posted: Fri Apr 05, 2019 5:40 pm
by JHPJHP
Hi jacky,
Change:
Code: Select all
hResult = SHParseDisplayName("R:\test_folders\00001", 0, *pidl, 0, 0)
To:
Code: Select all
hResult = SHParseDisplayName("R:\test_folders\00001", 0, @pidl, 0, 0)
Re: Question about Prototypes and calling a function
Posted: Fri Apr 05, 2019 6:22 pm
by jacky
Hi JHPJHP,
after
additionally changing
to
it ... works!
Thanks a lot!
Re: Question about Prototypes and calling a function
Posted: Fri Apr 05, 2019 6:24 pm
by skywalk
@*pidl works also.
Re: Question about Prototypes and calling a function
Posted: Fri Apr 05, 2019 10:55 pm
by jacky
Yes, skywalk, you're right, it's also working that way
The whole calling that function thing can't be accelerated in any way, right?
I'm asking because doing that call with a list of 20.000 folder entries takes about 2,75 seconds alone.
v5.70 x64, compiled .exe
Windows Explorer must use some kind of different way to build the shell context menu. Clicking on 20.000 selected
folders with the right mouse button shows the context menu
instantly...
Re: Question about Prototypes and calling a function
Posted: Sat Apr 06, 2019 6:10 pm
by skywalk
Windows is the operating system and indexes files and folders in the background. To duplicate that in code requires a database and threads.