Enumerate Audio Devices

[cmajor28]

I'm trying to get some information from audio devices however whenever I run my code below, the device description and manufacturer are wrong. What am I doing wrong?

#include <stdio.h>
#include <SetupAPI.h>
#include <devpkey.h>

DWORD STDAPICALLTYPE EnumAudioDevices() {

	HANDLE hEnumerator = NULL;
	DWORD dwIndex = 0;
	WCHAR szBuffer[256] = { 0 };
	DEVPROPTYPE propType = 0;
	SP_DEVINFO_DATA spDeviceInfo = { sizeof(SP_DEVINFO_DATA) };

	hEnumerator = SetupDiGetClassDevs(NULL, L"SWD\\MMDEVAPI", NULL, DIGCF_ALLCLASSES);

	while (SetupDiEnumDeviceInfo(hEnumerator, dwIndex++, &spDeviceInfo)) {

		// Name
		SetupDiGetDeviceProperty(hEnumerator, &spDeviceInfo, &DEVPKEY_Device_FriendlyName, &propType, (PBYTE)szBuffer, 512, NULL, 0);
		wprintf(L"\nDevice %i: %s\n", dwIndex, szBuffer);
		memset(szBuffer, 0, 512);

		// ID
		SetupDiGetDeviceInstanceId(hEnumerator, &spDeviceInfo, szBuffer, 512, NULL);
		wprintf(L"ID: %s\n", szBuffer);
		memset(szBuffer, 0, 512);

		// Description
		SetupDiGetDeviceProperty(hEnumerator, &spDeviceInfo, &DEVPKEY_Device_DeviceDesc, &propType, (PBYTE)szBuffer, 512, NULL, 0);
		wprintf(L"Description: %s\n", szBuffer);
		memset(szBuffer, 0, 512);

		// Manufacturer
		SetupDiGetDeviceProperty(hEnumerator, &spDeviceInfo, &DEVPKEY_Device_Manufacturer, &propType, (PBYTE)szBuffer, 512, NULL, 0);
		wprintf(L"Manufacturer: %s\n", szBuffer);
		memset(szBuffer, 0, 512);

	}

	return dwIndex;
}

int __cdecl main() {

	wprintf(L"\nDevice Count: %i\n\n", EnumAudioDevices());

	return 0;
}

[OReubens]

don't know the specifics of that API call, but it's similar to many others so...
you may need to set the sizeof the devinfo data explicitely on each call rather than just once
you may need to set the rest of the buffer to zero explicitely on each call rather than just once

[cmajor28]

The info gets put into the buffer correctly but it does match what is in the Sound section of the control panel. For example: instead of saying "Realtek" for device manufacturer it says "Microsoft".

Edit: I think I figured out why this is happening. Windows treats Audio Devices and Audio Device Endpoints as totally different devices (even though they arent). I can obtain what seems to be a symbolic link to the underlying device (it's the underlying device ID) but how can I get some properties from this?

The value is: HDAUDIO\FUNC_01&VEN_10EC&DEV_0288&SUBSYS_10EC0191&REV_1000\4&3a2ab354&0&0001