Apple Network Setup Bedienungsanleitung PDF herunterladen (Seite 39)

CHAPTER 2

Using Network Setup

Reading and Writing Preferences 39

}

return err;

}

Writing Preferences 2

Listing 2-11 shows the routine MyWritePref, which demonstrates the basic

mechanism for writing preferences. Writing a preference is similar to reading a

preference, with the following exceptions:

■ When you open the entity, open the entity for writing by passing true in the

writer parameter of OTCfgOpenPrefs.

■ The entity that is opened must be in a writable temporary area. Attempting

to open for writing an entity in a read-only area will result in an error.

Note

You don’t need provide the area identiﬁer when you call

OTCfgOpenPrefs because an entity “knows” the area to

which it belongs. ◆

Listing 2-11 Writing a preference

static OSStatus MyWritePref(CfgDatabaseRef dbRef,

const CfgEntityRef *entity,

OSType prefType,

const void *buffer,

ByteCount bufferSize)

{

OSStatus err;

OSStatus err2;

CfgEntityAccessID accessID;

assert(dbRef != nil);

assert(entity != nil);

assert(buffer != nil);

err = OTCfgOpenPrefs(dbRef, entity, true, &accessID);

if (err == noErr) {

err = OTCfgSetPrefs(accessID, prefType, buffer, bufferSize);

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Apple Network Setup Bedienungsanleitung Seite 39