ACM_IOControl

This function is the I/O controls routine for an ACM device driver.

Syntax

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

Parameters

dwOpenData

Specifies a value returned from a call to the ACM_Open function.

dwCode

Specifies an I/O control code for this function to perform. This function supports only one I/O control value, IOCTL_ACM_MESSAGE.

pBufIn

Pointer to the input parameter structure ( ACMDRV_MESSAGE_PARAMS ).

dwLenIn

Specifies the size, in bytes, of ACMDRV_MESSAGE_PARAMS.

pBufOut

Pointer to the return value ( DWORD ).

dwLenOut

Specifies the size of the return value variable DWORD.

pdwActualOut

Is not used, must be zero.

Return Values

TRUE indicates success. FALSE indicates failure.

Remarks

The ACM Driver Wrapper library (Acmdwrap.lib) calls the DriverProc with the message specified in the ACMDRV_MESSAGE_PARAMS structure.