Forum Discussion

Copper Contributor

Nov 14, 2024

MMDevApi.dll bug report (Windows 11 24H2)

I'm the developer of text-to speech (TTS) application, it has been distributed for many years, and there have been no problems with MMDevApi.dll, from Windows XP to Windows 11 23H2. Now I get dozens ...

Application Management

kamenf

Copper Contributor

Dec 05, 2024

My 2 cents:

I have exactly the same problem with another application:

Faulting module name: MMDevApi.dll, version: 10.0.26100.1882, time stamp: 0xbe6f88f4
Exception code: 0xc0000005
Fault offset: 0x0002564d

It happens with win32 application registering IMMNotificationClient. The same code compiled for win64 is OK.

Simple code similar to this: https://learn.microsoft.com/en-us/windows/win32/coreaudio/device-events is anough to reproduce the problem.

I also observed that playing some sound with "Windows Media Player Legacy" (which is 32 bit) or another 32 bit media player before running the faulty program overcomes the MMDevApi crash and it works if you are not changing devices (or there is nothing happening in the system that tries to notify registered IMMNotificationClient).