Call Library Function Node for waveOutGetDevCaps

[noelingle]

I'm trying to construct a Win API call to waveOutGetDevCaps using Call Library Function Node.  I know it is possible, but I don't know how to configure the Function Node object.

Here is the VB6 declaration:

Declare Function waveOutGetDevCaps Lib "winmm.dll" Alias "waveOutGetDevCapsA" _
   (ByVal uDeviceID As Long, _
   lpCaps As WAVEOUTCAPS, _
   ByVal uSize As Long) As Long
'/////////////////////////////////////////////////////////////////////////////////////////////
' This Windows API function retrieves the capabilities of a given waveform-audio output device.
' The function uses the following parameters:
'     uDeviceID-  a long value identifying the waveform-audio output device.
'     lpCaps-     the user defined variable with information about the capabilities of the device.
'     uSize-      the size of the user-defined variable used to store information about the
'                 capabilities of the device.
'////////////////////////////////////////////////////////////////////////////////////////////

lpCaps/WAVEOUTCAPS type is the problem.  I don't know how to replicate it in LabView.

This data type has to go in on the lpCaps input to the Call Library Function Node.

Type WAVEOUTCAPS
'///////////////////////////////////////////////////////////////////////////////////////////
' The WAVEOUTCAPS user-defined variable describes the capabilities of a waveform-audio
' output device.
'///////////////////////////////////////////////////////////////////////////////////////////
   wMid As Integer                  ' Manufacturer identifier for the device driver for
                                    ' the device. Manufacturer identifiers are defined
                                    ' in Manufacturer and Product Identifiers in the
                                    ' Platform SDK product documentation.

   wPid As Integer                  ' Product identifier for the device. Product
                                    ' identifiers are defined in Manufacturer and Product
                                    ' Identifiers in the Platform SDK product documentation.

   vDriverVersion As Long           ' Version number of the device driver for the device.
                                    ' The high-order byte is the major version number, and
                                    ' the low-order byte is the minor version number.

   szPname As String * MAXPNAMELEN  ' Product name in a null-terminated string.

   dwFormats As Long                ' Standard formats that are supported. See the Platform
                                    ' SDK product documentation for more information.
                                   
   wChannels As Integer             ' 1 if the device supports mono or 2 if the device supports
                                    ' stereo output.

   dwSupport As Long                ' Optional functionality supported by the device. See the
                                    ' Platform SDK product documentation for more information.
End Type

Thanks,

Noel

[Samuel_S]

Noel

What is the type of data being passed in IpCaps? I believe you need a header file to determine this. You may also want to check out this

http://decibel.ni.com/content/docs/DOC-2030

http://zone.ni.com/devzone/cda/epd/p/id/4935

[Samuel_S]

You can also see some other peoples response to a similar question here:

http://forums.ni.com/t5/LabVIEW/Has-anyone-used-the-waveOut-interface-in-Labview-to/m-p/257266#M1385...

this one deals with the same API

http://forums.ni.com/t5/LabVIEW/waveout-dll-help/m-p/287559

Let me know if that works 🙂 happy presidents day!