detect.c File Reference

#include "precomp.h"
#include <mment4.h>
#include <mmebuddy_debug.h>

Include dependency graph for detect.c:

Go to the source code of this file.

Functions
MMRESULT	EnumerateNt4ServiceSoundDevices (IN LPWSTR ServiceName, IN MMDEVICE_TYPE DeviceType, IN SOUND_DEVICE_DETECTED_PROC SoundDeviceDetectedProc)
MMRESULT	DetectNt4SoundDevices (IN MMDEVICE_TYPE DeviceType, IN PWSTR BaseDeviceName, IN SOUND_DEVICE_DETECTED_PROC SoundDeviceDetectedProc)

Function Documentation

DetectNt4SoundDevices()

MMRESULT DetectNt4SoundDevices	(	IN MMDEVICE_TYPE	DeviceType,
		IN PWSTR	BaseDeviceName,
		IN SOUND_DEVICE_DETECTED_PROC	SoundDeviceDetectedProc
	)

Definition at line 151 of file detect.c.

{
    SIZE_T DeviceNameLength = 0;
    PWSTR DeviceName = NULL;
    ULONG Index = 0;
    HANDLE DeviceHandle;
    BOOLEAN DoSearch = TRUE;

    VALIDATE_MMSYS_PARAMETER( IsValidSoundDeviceType(DeviceType) );

    DeviceNameLength = wcslen(BaseDeviceName);
    /* Consider the length of the number */
    DeviceNameLength += GetDigitCount(Index);

    DeviceName = AllocateWideString(DeviceNameLength);

    if ( ! DeviceName )
    {
        return MMSYSERR_NOMEM;
    }

    while ( DoSearch )
    {
        /* Nothing like a nice clean device name */
        ZeroWideString(DeviceName);
        wsprintf(DeviceName, L"%ls%d", BaseDeviceName, Index);

        if ( OpenKernelSoundDeviceByName(DeviceName,
                                         TRUE,
                                         &DeviceHandle) == MMSYSERR_NOERROR )
        {
            /* Notify the callback function */
            SND_TRACE(L"Found device: %wS\n", DeviceName);
            SoundDeviceDetectedProc(DeviceType, DeviceName);

            CloseHandle(DeviceHandle);

            ++ Index;
        }
        else
        {
            DoSearch = FALSE;
        }
    }

    FreeMemory(DeviceName);

    return MMSYSERR_NOERROR;
}

EnumerateNt4ServiceSoundDevices()

MMRESULT EnumerateNt4ServiceSoundDevices	(	IN LPWSTR	ServiceName,
		IN MMDEVICE_TYPE	DeviceType,
		IN SOUND_DEVICE_DETECTED_PROC	SoundDeviceDetectedProc
	)

Definition at line 26 of file detect.c.

{
    HKEY Key;
    DWORD KeyIndex = 0;

    VALIDATE_MMSYS_PARAMETER( ServiceName );

    /* Device type zero means "all" */
    VALIDATE_MMSYS_PARAMETER( IsValidSoundDeviceType(DeviceType) ||
                              DeviceType == 0 );

    while ( OpenSoundDeviceRegKey(ServiceName, KeyIndex, &Key) == MMSYSERR_NOERROR )
    {
        HKEY DevicesKey;
        DWORD ValueType = REG_NONE, ValueIndex = 0;
        DWORD MaxNameLength = 0, ValueNameLength = 0;
        PWSTR DevicePath = NULL, ValueName = NULL;
        DWORD ValueDataLength = sizeof(DWORD);
        DWORD ValueData;

        if ( RegOpenKeyEx(Key,
                          REG_DEVICES_KEY_NAME_U,
                          0,
                          KEY_READ,
                          &DevicesKey) == ERROR_SUCCESS )
        {
            /* Find out how much memory is needed for the key name */
            if ( RegQueryInfoKey(DevicesKey,
                                 NULL, NULL, NULL, NULL, NULL, NULL, NULL,
                                 &MaxNameLength,
                                 NULL, NULL, NULL) != ERROR_SUCCESS )
            {
                SND_ERR(L"Failed to query registry key information\n");
                RegCloseKey(DevicesKey);
                RegCloseKey(Key);

                return MMSYSERR_ERROR;
            }

            DevicePath = AllocateWideString(MaxNameLength +
                                            strlen("\\\\.\\"));

            /* Check that the memory allocation was successful */
            if ( ! DevicePath )
            {
                /* There's no point in going further */
                RegCloseKey(DevicesKey);
                RegCloseKey(Key);

                return MMSYSERR_NOMEM;
            }

            /* Insert the device path prefix */
            wsprintf(DevicePath, L"\\\\.\\");

            /* The offset of the string following this prefix */
            ValueName = DevicePath + strlen("\\\\.\\");

            /* Copy this so that it may be overwritten - include NULL */
            ValueNameLength = MaxNameLength + sizeof(WCHAR);

            SND_TRACE(L"Interested in devices beginning with %wS\n", DevicePath);

            while ( RegEnumValue(DevicesKey,
                                 ValueIndex,
                                 ValueName,
                                 &ValueNameLength,
                                 NULL,
                                 &ValueType,
                                 (LPBYTE) &ValueData,
                                 &ValueDataLength) == ERROR_SUCCESS )
            {
                /* Device types are stored as DWORDs */
                if ( ( ValueType == REG_DWORD ) &&
                     ( ValueDataLength == sizeof(DWORD) ) )
                {
                    if ( ( DeviceType == 0 ) ||
                         ( DeviceType == ValueData ) )
                    {
                        SND_TRACE(L"Found device: %wS\n", DevicePath);
                        SoundDeviceDetectedProc(ValueData, DevicePath);
                    }
                }

                /* Reset variables for the next iteration */
                ValueNameLength = MaxNameLength + sizeof(WCHAR);
                ZeroMemory(ValueName, (MaxNameLength+1)*sizeof(WCHAR));
                /*ZeroWideString(ValueName);*/
                ValueDataLength = sizeof(DWORD);
                ValueData = 0;
                ValueType = REG_NONE;

                ++ ValueIndex;
            }

            FreeMemory(DevicePath);

            RegCloseKey(DevicesKey);
        }
        else
        {
            SND_WARN(L"Unable to open the Devices key!\n");
        }

        ++ KeyIndex;

        RegCloseKey(Key);
    }

    return MMSYSERR_NOERROR;
}

Referenced by DriverProc().