acmDriverOpen function (msacm.h)

The acmDriverOpen function opens the specified ACM driver and returns a driver instance handle that can be used to communicate with the driver.

Syntax

MMRESULT ACMAPI acmDriverOpen(
  LPHACMDRIVER phad,
  HACMDRIVERID hadid,
  DWORD        fdwOpen
);

phad

Pointer to a buffer that receives the new driver instance handle that can be used to communicate with the driver.

hadid

Handle to the driver identifier of an installed and enabled ACM driver.

fdwOpen

Reserved; must be zero.

Returns zero if successful or an error otherwise. Possible error values include the following.

Return code	Description
MMSYSERR_INVALFLAG	At least one flag is invalid.
MMSYSERR_INVALHANDLE	The specified handle is invalid.
MMSYSERR_INVALPARAM	At least one parameter is invalid.
MMSYSERR_NOMEM	The system is unable to allocate resources.
MMSYSERR_NOTENABLED	The driver is not enabled.

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