ACM_IOControl

The function ACM_IOControl is used to pass IO control codes to the ACM driver.

Syntax

BOOL ACM_IOControl( DWORD dwOpenData, DWORD dwCode, PBYTE pBufIn, DWORD dwLenIn, PBYTE pBufOut, DWORD dwLenOut, PDWORD pdwActualOut );

Return Value

Returns TRUE for success, FALSE for failure.

Parameters

dwOpenData

Value returned from ACM_Open call.

dwCode

IO control code for the function to be performed. ACM_IOControl only supports one IOCTL value (IOCTL_ACM_MESSAGE).

pBufIn

Pointer to the input parameter structure (ACMDRV_MESSAGE_PARAMS).

dwLenIn

Size in bytes of input parameter structure (ACMDRV_MESSAGE_PARAMS).

pBufOut

Pointer to the return value (DWORD).

dwLenOut

Size of the return value variable (DWORD).

pdwActualOut

Unused.

See Also

ACM Driver Messages (ACMDM_XXX)