Hello, Indeed, WID_Open certainly suffers from the same problem.
Here is the patch for both. >From 51cee06af9f5901ca7310aad1077d4b07472da1e Mon Sep 17 00:00:00 2001 From: Fabrice Bauzac <libn...@gmail.com> Date: Tue, 20 Aug 2013 05:37:53 +0200 Subject: winmm: fix WOD_Open() and WID_Open() WAVE_MAPPER no-device case. WOD_Open() and WID_Open() now return MMSYSERR_BADDEVICEID in case WAVE_MAPPER is requested and no device is present. Fixes #34305. --- dlls/winmm/waveform.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/dlls/winmm/waveform.c b/dlls/winmm/waveform.c index 752e64d..bb91a22 100644 --- a/dlls/winmm/waveform.c +++ b/dlls/winmm/waveform.c @@ -1228,6 +1228,9 @@ static LRESULT WOD_Open(WINMM_OpenInfo *info) WINMM_MMDevice *mmdevice; if(WINMM_IsMapper(info->req_device)){ + if (g_outmmdevices_count == 0) { + return MMSYSERR_BADDEVICEID; + } devices = g_out_mapper_devices; mmdevice = read_map(g_out_map, 0); lock = &g_devthread_lock; @@ -1317,6 +1320,9 @@ static LRESULT WID_Open(WINMM_OpenInfo *info) HRESULT hr; if(WINMM_IsMapper(info->req_device)){ + if (g_inmmdevices_count == 0) { + return MMSYSERR_BADDEVICEID; + } devices = g_in_mapper_devices; mmdevice = read_map(g_in_map, 0); lock = &g_devthread_lock; -- 1.8.1.2 Thanks! Best regards Fabrice