PRB: waveInMessage or waveOutMessage Return MMSYSERR_INVALPARAM

Last reviewed: February 16, 1998
Article ID: Q180580

The information in this article applies to:

Microsoft Win32 Software Development Kit (SDK) on the following platforms:
```
    - Microsoft Windows 95
```

SYMPTOMS

When you call waveInMessage or waveOutMessage, you may receive an error code MMSYSERR_INVALPARAM, as defined in mmsystem.h.

CAUSE

Mmsystem performs range checking on the uMsg parameter passed to waveInMessage or waveOutMessage. If uMsg is not within the valid range for an IOCTL or MAPPER message, the function will fail.

The range checking is performed as follows:

     if ((uMsg < DRVM_IOCTL) || (uMsg >= DRVM_IOCTL_LAST) && (uMsg <
          DRVM_MAPPER))
         return MMSYSERR_INVALPARAM;

   DRVM_IOCTL, DRVM_IOCTL_LAST, and DRVM_MAPPER are defined in mmddk.h.

RESOLUTION

When you call waveInMessage or waveOutMessage, make sure that the uMsg parameter is a valid IOCTL or MAPPER message.

STATUS

This behavior is by design.

REFERENCES

Win32 Software Development Kit for Windows 95 and Windows NT: waveInMessage; waveOutMessage

Windows 95 Device Driver Kit: multimedia drivers

Keywords          : MMWave
Version           : WINNT:4.0; WIN95
Platform          : Win95
Issue type        : kbprb

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Last reviewed: February 16, 1998
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