[UWP] Fix crash when probe capture device fail (#868)

* [UWP] Fix crash when probe capture device fail

* [UWP] Also check openDevice to avoid crash

1 files changed, 4 insertions, 1 deletions

diff --git a/alc/backends/wasapi.cpp b/alc/backends/wasapi.cpp
index c5282fcb..dccbeba2 100644
--- a/alc/backends/wasapi.cpp
+++ b/alc/backends/wasapi.cpp
@@ -577,7 +577,8 @@ struct DeviceHelper final : private IMMNotificationClient
         Platform::String^ devIfPath =
             devid.empty() ? (flow == eRender ? MediaDevice::GetDefaultAudioRenderId(deviceRole) : MediaDevice::GetDefaultAudioCaptureId(deviceRole))
             : ref new Platform::String(devid.data());
-
+        if (!devIfPath)
+            return E_POINTER;
         Concurrency::task<DeviceInformation^> createDeviceOp(
             DeviceInformation::CreateFromIdAsync(devIfPath, nullptr, DeviceInformationKind::DeviceInterface));
         auto status = createDeviceOp.then([&](DeviceInformation^ deviceInfo)
@@ -674,6 +675,8 @@ struct DeviceHelper final : private IMMNotificationClient
         const auto deviceRole = Windows::Media::Devices::AudioDeviceRole::Default;
         auto DefaultAudioId   = flowdir == eRender ? MediaDevice::GetDefaultAudioRenderId(deviceRole)
                                                    : MediaDevice::GetDefaultAudioCaptureId(deviceRole);
+        if (!DefaultAudioId)
+            return defaultId;
         Concurrency::task<DeviceInformation ^> createDefaultOp(DeviceInformation::CreateFromIdAsync(DefaultAudioId, nullptr, DeviceInformationKind::DeviceInterface));
         auto task_status = createDefaultOp.then([&defaultId](DeviceInformation ^ deviceInfo)
         {