QNetworkAddressEntry 類存儲由網絡接口支持的一個 IP 地址，及其關聯的 Netmask (網絡掩碼) 和廣播地址。 更多...
| 頭： | #include <QNetworkAddressEntry> |
| qmake: | QT += network |
| Since: | Qt 4.2 |
該類在 Qt 4.2 引入。
注意： 此類的所有函數 可重入 .
| enum | DnsEligibilityStatus { DnsEligibilityUnknown, DnsEligible, DnsIneligible } |
| QNetworkAddressEntry (const QNetworkAddressEntry & other ) | |
| QNetworkAddressEntry () | |
| QNetworkAddressEntry & | operator= (const QNetworkAddressEntry & other ) |
| ~QNetworkAddressEntry () | |
| QHostAddress | broadcast () const |
| void | clearAddressLifetime () |
| QNetworkAddressEntry::DnsEligibilityStatus | dnsEligibility () const |
| QHostAddress | ip () const |
| bool | isLifetimeKnown () const |
| bool | isPermanent () const |
| bool | isTemporary () const |
| QHostAddress | netmask () const |
| QDeadlineTimer | preferredLifetime () const |
| int | prefixLength () const |
| void | setAddressLifetime (QDeadlineTimer preferred , QDeadlineTimer validity ) |
| void | setBroadcast (const QHostAddress & newBroadcast ) |
| void | setDnsEligibility (QNetworkAddressEntry::DnsEligibilityStatus status ) |
| void | setIp (const QHostAddress & newIp ) |
| void | setNetmask (const QHostAddress & newNetmask ) |
| void | setPrefixLength (int length ) |
| void | swap (QNetworkAddressEntry & other ) |
| QDeadlineTimer | validityLifetime () const |
| bool | operator!= (const QNetworkAddressEntry & other ) const |
| bool | operator== (const QNetworkAddressEntry & other ) const |
每個網絡接口可以包含零個或多個 IP 地址，可以依次關聯 Netmask (網絡掩碼) 和/或廣播地址 (取決於操作係統是否支持)。
此類錶示一個這樣的組。
This enum indicates whether a given host address is eligible to be published in the Domain Name System (DNS) or other similar name resolution mechanisms. In general, an address is suitable for publication if it is an address this machine will be reached at for an indeterminate amount of time, though it need not be permanent. For example, addresses obtained via DHCP are often eligible, but cryptographically-generated temporary IPv6 addresses are not.
| 常量 | 值 | 描述 |
|---|---|---|
QNetworkAddressEntry::DnsEligibilityUnknown
|
-1
|
Qt and the operating system could not determine whether this address should be published or not. The application may need to apply further heuristics if it cannot find any eligible addresses. |
QNetworkAddressEntry::DnsEligible
|
1
|
This address is eligible for publication in DNS. |
QNetworkAddressEntry::DnsIneligible
|
0
|
This address should not be published in DNS and should not be transmitted to other parties, except maybe as the source address of an outgoing packet. |
該枚舉在 Qt 5.11 引入 (或被修改)。
另請參閱 dnsEligibility () 和 setDnsEligibility ().
構造 QNetworkAddressEntry 對象副本源於對象 other .
構造空的 QNetworkAddressEntry 對象。
Makes a copy of the QNetworkAddressEntry 對象 other .
銷毀此 QNetworkAddressEntry 對象。
Returns the broadcast address associated with the IPv4 address and netmask. It can usually be derived from those two by setting to 1 the bits of the IP address where the netmask contains a 0. (In other words, by bitwise-OR'ing the IP address with the inverse of the netmask)
This member is always empty for IPv6 addresses, since the concept of broadcast has been abandoned in that system in favor of multicast. In particular, the group of hosts corresponding to all the nodes in the local network can be reached by the "all-nodes" special multicast group (address FF02::1).
另請參閱 setBroadcast ().
Resets both the preferred and valid lifetimes for this address. After this call,
isLifetimeKnown
() 會返迴
false
.
該函數在 Qt 5.11 引入。
另請參閱 preferredLifetime (), validityLifetime (), isLifetimeKnown ()，和 setAddressLifetime ().
Returns whether this address is eligible for publication in the Domain Name System (DNS) or similar name resolution mechanisms.
In general, an address is suitable for publication if it is an address this machine will be reached at for an indeterminate amount of time, though it need not be permanent. For example, addresses obtained via DHCP are often eligible, but cryptographically-generated temporary IPv6 addresses are not.
在某些係統， QNetworkInterface will need to heuristically determine which addresses are eligible.
該函數在 Qt 5.11 引入。
另請參閱 isLifetimeKnown (), isPermanent ()，和 setDnsEligibility ().
This function returns one IPv4 or IPv6 address found, that was found in a network interface.
另請參閱 setIp ().
返迴
true
若地址壽命已知，
false
若不。若壽命未知，
preferredLifetime
() 和
validityLifetime
() 會返迴
QDeadlineTimer::Forever
.
該函數在 Qt 5.11 引入。
另請參閱 preferredLifetime (), validityLifetime (), setAddressLifetime ()，和 clearAddressLifetime ().
返迴
true
if this address is permanent on this interface,
false
if it's temporary. A permanent address is one which has no expiration time and is often static (manually configured).
If this information could not be determined, this function returns
true
.
注意： Depending on the operating system and the networking configuration tool, it is possible for a temporary address to be interpreted as permanent, if the tool did not inform the details correctly to the operating system.
該函數在 Qt 5.11 引入。
另請參閱 isLifetimeKnown (), validityLifetime ()，和 isTemporary ().
返迴
true
若此地址在該接口上是臨時的，
false
若它是永久性的。
該函數在 Qt 5.11 引入。
另請參閱 isLifetimeKnown (), validityLifetime ()，和 isPermanent ().
Returns the netmask associated with the IP address. The netmask is expressed in the form of an IP address, such as 255.255.0.0.
For IPv6 addresses, the prefix length is converted to an address where the number of bits set to 1 is equal to the prefix length. For a prefix length of 64 bits (the most common value), the netmask will be expressed as a QHostAddress holding the address FFFF:FFFF:FFFF:FFFF::
另請參閱 setNetmask () 和 prefixLength ().
Returns the deadline when this address becomes deprecated (no longer preferred), if known. If the address lifetime is not known (see isLifetimeKnown ()), this function always returns QDeadlineTimer::Forever .
While an address is preferred, it may be used by the operating system as the source address for new, outgoing packets. After it becomes deprecated, it will remain valid for incoming packets for a while longer until finally removed (see validityLifetime ()).
該函數在 Qt 5.11 引入。
另請參閱 validityLifetime (), isLifetimeKnown (), setAddressLifetime ()，和 clearAddressLifetime ().
Returns the prefix length of this IP address. The prefix length matches the number of bits set to 1 in the netmask (see netmask ()). For IPv4 addresses, the value is between 0 and 32. For IPv6 addresses, it's contained between 0 and 128 and is the preferred form of representing addresses.
This function returns -1 if the prefix length could not be determined (i.e., netmask () returns a null QHostAddress()).
該函數在 Qt 4.5 引入。
另請參閱 setPrefixLength () 和 netmask ().
Sets both the preferred and valid lifetimes for this address to the
preferred
and
validity
deadlines, respectively. After this call,
isLifetimeKnown
() 會返迴
true
, even if both parameters are
QDeadlineTimer::Forever
.
該函數在 Qt 5.11 引入。
另請參閱 preferredLifetime (), validityLifetime (), isLifetimeKnown ()，和 clearAddressLifetime ().
Sets the broadcast IP address of this QNetworkAddressEntry 對象到 newBroadcast .
另請參閱 broadcast ().
Sets the DNS eligibility flag for this address to status .
該函數在 Qt 5.11 引入。
另請參閱 dnsEligibility ().
Sets the IP address the QNetworkAddressEntry object contains to newIp .
另請參閱 ip ().
Sets the netmask that this QNetworkAddressEntry object contains to newNetmask . Setting the netmask also sets the prefix length to match the new netmask.
另請參閱 netmask () 和 setPrefixLength ().
Sets the prefix length of this IP address to length . The value of length must be valid for this type of IP address: between 0 and 32 for IPv4 addresses, between 0 and 128 for IPv6 addresses. Setting to any invalid value is equivalent to setting to -1, which means "no prefix length".
Setting the prefix length also sets the netmask (see netmask ()).
該函數在 Qt 4.5 引入。
另請參閱 prefixLength () 和 setNetmask ().
Swaps this network address entry instance with other 。此函數非常快且從不失敗。
該函數在 Qt 5.0 引入。
Returns the deadline when this address becomes invalid and will be removed from the networking stack, if known. If the address lifetime is not known (see isLifetimeKnown ()), this function always returns QDeadlineTimer::Forever .
While an address is valid, it will be accepted by the operating system as a valid destination address for this machine. Whether it is used as a source address for new, outgoing packets is controlled by, among other rules, the preferred lifetime (see preferredLifetime ()).
該函數在 Qt 5.11 引入。
另請參閱 preferredLifetime (), isLifetimeKnown (), setAddressLifetime ()，和 clearAddressLifetime ().
返迴
true
若此網絡地址條目不同於
other
.
返迴
true
若此網絡地址條目等同
other
.
