On Jul 9, 2008, at 8:22 AM, xiaobin wrote:
Hello,
I am writing a program to detect the status of network.
In my program, I need get the status of network when the connection is
set disable. here it is not by connecting the network to get the
status.
which API or method can work for it?
I've used two methods in previous projects. This is all CoreFoundation
code that I used in daemons but should work just fine in a Cocoa
environment.
1) If you just want to know whether the system is connected to a
network then you can lookup the default router. If the default router
is present then you could assume that the network is up.
CFStringRef CFXGetDefaultIPv4RouterCopy()
{
CFStringRef result = NULL;
SCDynamicStoreRef dynamicStore = SCDynamicStoreCreate(NULL,
CFSTR("StefansCoreFoundationExtensions"), NULL, NULL);
if (dynamicStore != NULL) {
CFDictionaryRef properties = (CFDictionaryRef)
SCDynamicStoreCopyValue(dynamicStore, CFSTR("State:/Network/Global/
IPv4"));
if (properties != NULL) {
result = (CFStringRef) CFDictionaryGetValue(properties,
CFSTR("Router"));
if (result != NULL) {
CFRetain(result);
}
CFRelease(properties);
}
CFRelease(dynamicStore);
}
return result;
}
2) If you want to continuously monitor the network status then you can
ask the System Configuration framework to let you know then the
default route changed.
void DefaultRouteHasChanged(SCDynamicStoreRef store, CFArrayRef
changedKeys, void *info)
{
...
}
void Foo()
{
...
// Start a watcher to keep track of State:/Network/Global/IPv4
SCDynamicStoreContext context = {0, NULL, NULL, NULL, NULL};
gDynamicStore = SCDynamicStoreCreate(NULL, CFSTR("SampleApp"),
DefaultRouteHasChanged, &context);
CFStringRef key = SCDynamicStoreKeyCreate(NULL, CFSTR("%@/%@/%@/
%@"), kSCDynamicStoreDomainState, kSCCompNetwork,
kSCCompGlobal, kSCEntNetIPv4);
CFArrayRef keyArray = CFArrayCreate(NULL, (const void **)(&key),
1, &kCFTypeArrayCallBacks);
SCDynamicStoreSetNotificationKeys(gDynamicStore, keyArray, NULL);
CFRelease(keyArray);
CFRelease(key);
CFRunLoopSourceRef runLoopSource =
SCDynamicStoreCreateRunLoopSource(NULL, gDynamicStore, 0);
CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource,
kCFRunLoopCommonModes);
CFRelease(runLoopSource);
...
// Run the RunLoop
CFRunLoopRun();
}
S.
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