ACM_Open

This function opens an ACM driver.

Syntax

PVOID ACM_Open( DWORD dwData, DWORD dwAccess,
DWORD dwShareMode );

Parameters

dwData

Specifies a value returned from ACM_Init call, which the driver is free to use or ignore.

dwAccess

Specifies a requested access level, a combination of GENERIC_READ and GENERIC_WRITE. The driver is free to use or ignore this value.

dwShareMode

Specifies a requested share mode, a combination of FILE_SHARE_READ and FILE_SHARE_WRITE. The driver is free to use or ignore this value.

Return Values

Returns a DWORD that is passed to the functions ACM_Read, ACM_Write, and so on, or NULL if unable to open the device.

Remarks

The ACM Driver Wrapper library (Acmdwrap.lib) always returns a constant value from this function.