HWND combo_box, standard;

BOOL CALLBACK EnumChildProc(HWND hwnd, LPARAM lParam)
{
    char szBuff[255];
    if(GetWindowText(hwnd, szBuff, sizeof(szBuff)))
    {
        if(!strcmp("&Als Standard", szBuff) && standard == NULL)
        {
            standard = hwnd;
        }
    }

    if(GetClassName(hwnd, szBuff, sizeof(szBuff)))
    {
        if(!strcmp("SysListView32", szBuff) && combo_box == NULL)
        {
            combo_box = hwnd;
        }
    }

    return true;
}

void changeAudio()
{
    static boolean switcher = true;

    standard = NULL;
    combo_box = NULL;

    HWND Back;
    system("control mmsys.cpl");
    HWND appletWindow = FindWindowA(NULL,"Sound");
    do
    {
        Sleep(10);
        appletWindow = FindWindowA(NULL,"Sound");
    }
    while((appletWindow == NULL));
    do
    {
        Sleep(10);
    }while(!IsWindowVisible(appletWindow));
    EnumChildWindows(appletWindow,EnumChildProc,(LPARAM)&Back);

    LVITEM temp;

    DWORD PID;
    //DWORD threadId = GetWindowThreadProcessId(combo_box, &PID);
    GetWindowThreadProcessId(combo_box, &PID);
    HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, false, PID);
    LPVOID lpRemoteBuffer = VirtualAllocEx(hProcess, NULL, sizeof(LVITEM), MEM_COMMIT, PAGE_READWRITE);

    temp.mask = LVIF_STATE;

    temp.state = 15;
    temp.stateMask = LVIS_SELECTED | LVIS_FOCUSED;

    WriteProcessMemory(hProcess, lpRemoteBuffer, &temp,sizeof(LVITEM),NULL);
    SendMessage(combo_box, LVM_SETITEMSTATE, (int)switcher, (LPARAM)lpRemoteBuffer);
    switcher = !switcher;

    SendMessage(standard,BM_CLICK,0,0);
    VirtualFreeEx(hProcess, lpRemoteBuffer, 0, MEM_RELEASE);
    CloseHandle(hProcess);
    SendMessage(appletWindow,WM_CLOSE,0,0);
}