ERdCancel

ERdCancel Cancel execution of a specific call to the ERead function

#include <ENET.h> AppleTalk Manager

OSErr ERdCancel( thePBptr, async);

EParamBlkPtr thePBptr; address of an EParamBlock structure

Boolean async; 0=await completion; 1=immediate return

returns Error Code; 0=no error

ERdCancel cancels execution of a specific call to the ERead function.

thePBptr is a pointer to an EParamBlock structure. The relevant fields are as

follows:

Out-InName Type Size Offset Description

¨ ioResult short 2 16 Result code

Æ csCode short 2 26 Always ENetRdCancel

Æ eProtType short 2 28 Ethernet protocol type

Æ ePointer long 4 30 pointer to data buffer

async is a Boolean value. Use FALSE for normal ( synchronous) operation

or TRUE to function asynchronously. See Async I/O.

Returns: an operating system Error Code. It will be one of:

noErr (0) No error

cbNotFound (-1102) ERead not active

Notes: You must have called the ERead function asynchronously to use the

ERdCancel function. You specify in the ePointer parameter a pointer to

the parameter block that you used when you called the ERead function. The

ioResult parameter returns the result of the function. If you call the

function asynchronously, the function sets this field to 1 as soon as it

begins execution, and it changes the field to the actual result code when it

completes execution. The csCode parameter is the routine selector,

automatically set by the high-level language interface. It is always

ENetRdCancel for this function.

When you call the ERdCancel function, the pending ERead function that

you cancel receives the reqAborted result code.

Referenced by (3):