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The QHostAddress class provides an IP address. More...
#include <QHostAddress>
The QHostAddress class provides an IP address.
This class holds an IPv4 or IPv6 address in a platform- and protocol-independent manner.
QHostAddress is normally used with the QTcpSocket, QTcpServer, and QUdpSocket to connect to a host or to set up a server.
A host address is set with setAddress(), checked for its type using isIPv4Address() or isIPv6Address(), and retrieved with toIPv4Address(), toIPv6Address(), or toString().
The class also supports common predefined addresses: Null, LocalHost, LocalHostIPv6, Broadcast, and Any.
See also QTcpSocket, QTcpServer, and QUdpSocket.
| Constant | Value | Description |
|---|---|---|
| QHostAddress::Null | 0 | The null address object. Equivalent to QHostAddress(). |
| QHostAddress::LocalHost | 2 | The IPv4 localhost address. Equivalent to QHostAddress("127.0.0.1"). |
| QHostAddress::LocalHostIPv6 | 3 | The IPv6 localhost address. Equivalent to QHostAddress("::1"). |
| QHostAddress::Broadcast | 1 | The IPv4 broadcast address. Equivalent to QHostAddress("255.255.255.255"). |
| QHostAddress::Any | 4 | The IPv4 any-address. Equivalent to QHostAddress("0.0.0.0"). |
| QHostAddress::AnyIPv6 | 5 | The IPv6 any-address. Equivalent to QHostAddress("::"). |
Constructs a host address object with the IP address 0.0.0.0.
See also clear().
Constructs a host address object with the IPv4 address ip4Addr.
Constructs a host address object with the IPv6 address ip6Addr.
ip6Addr must be a 16-byte array in network byte order (big endian).
Constructs a host address object with the IPv6 address ip6Addr.
Constructs an IPv4 or IPv6 address using the address specified by the native structure sockaddr.
See also setAddress().
Constructs an IPv4 or IPv6 address based on the string address (e.g., "127.0.0.1").
See also setAddress().
Constructs a copy of the given address.
Constructs a QHostAddress object for address.
Destroys the host address object.
Sets the host address to 0.0.0.0.
Returns true if this host address is null (INADDR_ANY or in6addr_any). The default constructor creates a null address, and that address is not valid for any host or interface.
Returns the network layer protocol of the host address.
Returns the scope ID of an IPv6 address. For IPv4 addresses, or if the address does not contain a scope ID, an empty QString is returned.
The IPv6 scope ID specifies the scope of reachability for non-global IPv6 addresses, limiting the area in which the address can be used. All IPv6 addresses are associated with such a reachability scope. The scope ID is used to disambiguate addresses that are not guaranteed to be globally unique.
IPv6 specifies the following four levels of reachability:
When using a link-local or site-local address for IPv6 connections, you must specify the scope ID. The scope ID for a link-local address is usually the same as the interface name (e.g., "eth0", "en1") or number (e.g., "1", "2").
This function was introduced in Qt 4.1.
See also setScopeId().
Set the IPv4 address specified by ip4Addr.
This is an overloaded member function, provided for convenience.
Set the IPv6 address specified by ip6Addr.
ip6Addr must be an array of 16 bytes in network byte order (high-order byte first).
This is an overloaded member function, provided for convenience.
Set the IPv6 address specified by ip6Addr.
This is an overloaded member function, provided for convenience.
Sets the IPv4 or IPv6 address specified by the string representation specified by address (e.g. "127.0.0.1"). Returns true and sets the address if the address was successfully parsed; otherwise returns false.
This is an overloaded member function, provided for convenience.
Sets the IPv4 or IPv6 address specified by the native structure sockaddr. Returns true and sets the address if the address was successfully parsed; otherwise returns false.
Sets the IPv6 scope ID of the address to id. If the address protocol is not IPv6, this function does nothing.
This function was introduced in Qt 4.1.
See also scopeId().
Returns the IPv4 address as a number.
For example, if the address is 127.0.0.1, the returned value is 2130706433 (i.e. 0x7f000001).
This value is only valid if isIp4Addr() returns true.
See also toString().
Returns the IPv6 address as a Q_IPV6ADDR structure. The structure consists of 16 unsigned characters.
Q_IPV6ADDR addr = hostAddr.toIPv6Address(); // addr contains 16 unsigned characters for (int i = 0; i < 16; ++i) { // process addr[i] }
This value is only valid if isIPv6Address() returns true.
See also toString().
Returns the address as a string.
For example, if the address is the IPv4 address 127.0.0.1, the returned string is "127.0.0.1".
See also toIPv4Address().
Returns true if this host address is not the same as the other address given; otherwise returns false.
This function was introduced in Qt 4.2.
This is an overloaded member function, provided for convenience.
Returns true if this host address is not the same as the other address given; otherwise returns false.
Assigns another host address to this object, and returns a reference to this object.
This is an overloaded member function, provided for convenience.
Assigns the host address address to this object, and returns a reference to this object.
See also setAddress().
Returns true if this host address is the same as the other address given; otherwise returns false.
This is an overloaded member function, provided for convenience.
Returns true if this host address is the same as the other address given; otherwise returns false.
This is an overloaded member function, provided for convenience.
Writes host address address to the stream out and returns a reference to the stream.
See also Format of the QDataStream operators.
This is an overloaded member function, provided for convenience.
Reads a host address into address from the stream in and returns a reference to the stream.
See also Format of the QDataStream operators.
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