4.0B3: Crash when sending a QWORD (q) to dll.

[spacefractal]

Code: Select all

ProcedureDLL BASS_setPosition(handle.l,secs.l)
  sec.q
  flo.f=1.0
  sec=CallFunction(BASS_ID,"BASS_ChannelSeconds2Bytes",handle,flo) // position in sec
  sec=sec*secs
  CallFunction(BASS_ID,"BASS_ChannelSetPosition",handle,sec) // crash
EndProcedure

Here is the BASS document how to use setposition function (where sec is a QWORD):

• BOOL WINAPI BASS_ChannelSetPosition(
  DWORD handle,
  QWORD pos
  );

So how can I pass a QWORD with the new type?

[Fred]

Callfunction can't be used for this, you will have to use a prototype to achieve this (or split the quad argument in 2 long, hi/low).

[spacefractal]

Do you have a plan to support that in the next beta?

Otherwice how do I do with that prototype or split convertning (another workaround)?

[Fred]

CallFunction() is kept only for backward compatibility, prototypes are much more flexible, so it's the way to go.

Ex:

Code: Select all

Prototype.l BASS_ChannelSetPositionPrototype(a.l, b.q)

BASS_ChannelSetPosition.BASS_ChannelSetPositionPrototype = GetFunction(#id, "BASS_ChannelSetPosition")
BASS_ChannelSetPosition(arg1, arg2)

[spacefractal]

Got it to work , Prototypes is the way to go.

Please update the manual, when you made the 4.0 final. I diddent know about it and have oversaw that thing.

You may want to move this topic to "Coding Questions", if you want.

[dontmailme]

Fo you have an example which returns a float but has no parameters ?

I have :-

prototype.f funcP()

func.funcP=getfunction(DLL, "func")

debug func

This will show 0 when the result should be 0.3

What am I doing wrong ?

[Fred]

you miss the parentheses, you're calling a function here:

Code: Select all

debug func()

[dontmailme]

Yes, I realise that Fred , but see below

Now I have managed to get it to work, I did have the openlbrary, prototype and getfunction in an include file and when I do this it fails when the debug func() is run from the main source with the error.... is not a function etc...

My include file must have a bug!

But it doesn't seem to matter, with or without the () I get the same result, the parenthesis are not required !!! , unless there are parameters to pass.