control pc volume

[elriwech]

hi, i need a way to control the pc volume using a slider. i did search on the forum for related topics all i've found many VI that control the volume of a .wav file in labview but what i really want is to adjust the volume of the pc (for example if i'm listening to an mp3 file using realplayer and i move down the slider in labview the volume should decrease)

[PackersFan]

There should be a Windows DLL that you can call with a Call Library Function Node, but I'm not sure what it is.

I did a little searching and this is the closest I got: http://msdn.microsoft.com/en-us/library/aa908146.aspx

[Zody]

Hey elriwech,

What version of Windows OS are you using?

For Windows XP and 2000 there is win32.dll that you can call and do that, for Windows Vista and 7 it is more difficult due to the restricitons you have.

Kind regards,

[elriwech]

i'm using windows vista

[elriwech]

packersfan, i have found the waveoutsetvolume earlier but i couldn't get it work using the call library function node, i didn't understand the required parameters for this function, if someone can give me a simple vi example i will be grateful

[PackersFan]

I have not used the DLL before, so the MSDN documentation I linked is the best I have unfortunately.

I am also concerned about what ion.rosca said, because I think I may have seen the same thing while searching for it.  The DLL will work on XP, but I think it fails in Vista and 7.

Sorry 

[elriwech]

😞 thank you any way, appreciate your help

[Zody]

Hello,

I've found the following topic on microsoft website:

http://msdn.microsoft.com/en-us/library/system.windows.controls.mediaelement.volume(v=vs.95).aspx#Y0

At this moment I don't know how is the dll built, as a .NET assembly, in this case you should use

http://zone.ni.com/reference/en-XX/help/371361H-01/lvdialog/assemblies_in_memory/

or if it is Active X service.

I believe the next step will be to write to microsoft and ask exactly which is the dll and how it is defined, as a C dll (I doubt that is C), as a .NET assembly (this makes more sense for me) or an Active X, in this case you should have a closer look at DCOM settings.

Kind regards,

Ion R.

[elriwech]

thank you ion.rosca, this could be a good start for me, your are helpfull 😄

[nxb]

Hi all,

I am having the same problem like elriwech ( need to control pc volume using LabVIEW ) however I have windows XP machine so I was wodering if someone could give me an example of what parameters to use for the .dll file. I would really appreciate.

Thanks