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// dllmain.cpp : Defines the entry point for the DLL application.
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#include "stdafx.h"
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#include <stdio.h>
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#include <objbase.h>
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#include <Windows.h>
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#include <mmdeviceapi.h>
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#include <endpointvolume.h>
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#include <functiondiscoverykeys_devpkey.h>
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unsigned int devCount = 0;
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const CLSID CLSID_MMDeviceEnumerator = __uuidof(MMDeviceEnumerator);
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const IID IID_IMMDeviceEnumerator = __uuidof(IMMDeviceEnumerator);
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HRESULT hr = S_OK;
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IMMDeviceEnumerator *pEnum = NULL;
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IMMDeviceCollection *pColl = NULL;
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void initDevices();
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#define SAFE_RELEASE(punk) \
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if ((punk) != NULL) \
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{ (punk)->Release(); (punk) = NULL; }
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BOOL APIENTRY DllMain( HMODULE hModule,
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DWORD ul_reason_for_call,
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LPVOID lpReserved
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) {
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switch (ul_reason_for_call) {
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case DLL_PROCESS_ATTACH:
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initDevices();
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break;
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case DLL_THREAD_ATTACH:
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// Thread-specific init
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case DLL_THREAD_DETACH:
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// Thread-specific cleanup
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case DLL_PROCESS_DETACH:
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//Perform any necessary cleanip
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break;
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}
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return TRUE;
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}
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extern "C" __declspec(dllexport) int _stdcall _getDevCount(unsigned int *deviceCount) {
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*deviceCount = devCount;
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return 1;
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}
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extern "C" __declspec(dllexport) LPWSTR _stdcall _getDevName(unsigned int dev) {
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IMMDevice *pEndpoint = NULL;
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IPropertyStore *pProps = NULL;
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LPWSTR pwszID = NULL;
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hr = pColl->Item(dev, &pEndpoint);
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hr = pEndpoint->GetId(&pwszID);
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hr = pEndpoint->OpenPropertyStore(STGM_READ, &pProps);
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PROPVARIANT varName;
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PropVariantInit(&varName);
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hr = pProps->GetValue(PKEY_Device_FriendlyName, &varName);
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LPWSTR name = varName.pwszVal;
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CoTaskMemFree(pwszID);
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pwszID = NULL;
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//PropVariantClear(&varName);
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SAFE_RELEASE(pEndpoint);
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SAFE_RELEASE(pProps);
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return name;
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}
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extern "C" __declspec(dllexport) unsigned int _stdcall _getDevVolume(unsigned int dev, float *deviceVolume) {
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IMMDevice *pEndpoint = NULL;
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hr = pColl->Item(dev, &pEndpoint);
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IAudioEndpointVolume *endpointVolume = NULL;
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pEndpoint->Activate(__uuidof(IAudioEndpointVolume), CLSCTX_INPROC_SERVER, NULL, (LPVOID *)&endpointVolume);
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float volume = 0;
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endpointVolume->GetMasterVolumeLevelScalar(&volume);
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*deviceVolume = volume;
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SAFE_RELEASE(pEndpoint);
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SAFE_RELEASE(endpointVolume);
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return 1;
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}
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extern "C" __declspec(dllexport) unsigned int _stdcall _setDevVolume(unsigned int dev, float deviceVolume) {
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IMMDevice *pEndpoint = NULL;
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hr = pColl->Item(dev, &pEndpoint);
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IAudioEndpointVolume *endpointVolume = NULL;
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pEndpoint->Activate(__uuidof(IAudioEndpointVolume), CLSCTX_INPROC_SERVER, NULL, (LPVOID *)&endpointVolume);
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endpointVolume->SetMasterVolumeLevelScalar(deviceVolume, NULL);
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SAFE_RELEASE(pEndpoint);
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SAFE_RELEASE(endpointVolume);
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return 1;
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}
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void initDevices() {
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hr = CoCreateInstance(CLSID_MMDeviceEnumerator, NULL,
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CLSCTX_ALL, IID_IMMDeviceEnumerator,
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(void**)&pEnum);
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hr = pEnum->EnumAudioEndpoints(eRender, DEVICE_STATE_ACTIVE, &pColl);
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hr = pColl->GetCount(&devCount);
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}
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