[wdmaudiodev] Re: obtaining a mixer for a given device interface
- From: "Jeff Pages" <jeff@xxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 6 Oct 2005 10:28:37 +1000
obtaining a mixer for a given device interfaceJerry asked for some sample
code...
Here's a sample that obtains the device interface given a device ID, and then
opens a handle to the interface. Note that the first parameter to waveInMessage
must be a device ID, not a waveIn handle - the documentation on this used to be
wrong but was recently fixed.
UINT DeviceID = 0;
ULONG Size = 0;
waveInMessage ((HWAVEIN) DeviceID, DRV_QUERYDEVICEINTERFACESIZE,
(DWORD_PTR) &Size, 0);
if (Size > 0) {
char *Info = new char[Size];
if (waveInMessage (0, DRV_QUERYDEVICEINTERFACE, (DWORD_PTR) Info,
(DWORD_PTR) Size) == MMSYSERR_NOERROR) {
HANDLE hDev = CreateFileW ((WCHAR *) Info, 0, 0, NULL,
OPEN_EXISTING, 0, NULL);
...
}
}
Jeff
----- Original Message -----
From: Jerry Evans
To: wdmaudiodev@xxxxxxxxxxxxx
Sent: Tuesday, October 04, 2005 9:53 PM
Subject: [wdmaudiodev] Re: obtaining a mixer for a given device interface
Jeff,
Have you got some example code you could share on this ?
Many thx.
Jerry
----- Original Message -----
From: Jeff Pages
To: wdmaudiodev@xxxxxxxxxxxxx
Sent: Thursday, July 21, 2005 6:37 AM
Subject: [wdmaudiodev] Re: obtaining a mixer for a given device interface
Given a mixer Device ID, you can obtain its corresponding device interface
by calling mixerMessage with DRV_QUERYDEVICEINTERFACE (and
DRV_QUERYDEVICEINTERFACESIZE). See the latest DDK under WDM Audio Extensions to
Legacy Windows Multimedia APIs for details. This should (hopefully) match with
one of the device interfaces you found from SetupDiEnumDeviceInterfaces.
Jeff Pages
Innes Corporation Pty Ltd
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