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The acmDriverClose function closes a previously opened ACM driver instance. If the function is successful, the handle is invalidated.
Syntax
MMRESULT ACMAPI acmDriverClose(
  HACMDRIVER had,
  DWORD      fdwClose
);
Parameters
had
Handle to the open driver instance to be closed.
fdwClose
Reserved; must be zero.
Return value
Returns zero if successful or an error otherwise. Possible error values include the following.
| Return code | Description | 
|---|---|
  | 
The driver is in use and cannot be closed. | 
  | 
At least one flag is invalid. | 
  | 
The specified handle is invalid. | 
Requirements
| Requirement | Value | 
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] | 
| Minimum supported server | Windows 2000 Server [desktop apps only] | 
| Target Platform | Windows | 
| Header | msacm.h | 
| Library | Msacm32.lib | 
| DLL | Msacm32.dll |