與遠程對象網絡 Qt API 交互 (但未實現) 的類 更多...
| 頭： | #include <QRemoteObjectReplica> |
| qmake: | QT += remoteobjects |
| 繼承： | QObject |
| 繼承者： | QRemoteObjectDynamicReplica and QRemoteObjectRegistry |
| enum | State { Uninitialized, Default, Valid, Suspect, SignatureMismatch } |
| bool | isInitialized () const |
| bool | isReplicaValid () const |
| QRemoteObjectNode * | node () const |
| void | setNode (QRemoteObjectNode * node ) |
| 狀態 | state () const |
| bool | waitForSource (int timeout = 30000) |
| void | initialized () |
| void | stateChanged (State state , State oldState ) |
與遠程對象網絡 Qt API 交互 (但未實現) 的類
A Remote Object Replica is a QObject proxy for another QObject (called the Source object). Once initialized, a replica can be considered a "latent copy" of the Source object. That is, every change to a Q_PROPERTY 在 Source , or signal emitted by the Source will be updated/emitted by all 復本 objects. Latency is introduced by process scheduling by any OSes involved and network communication latency. As long as the replica has been initialized and the communication is not disrupted, receipt and order of changes is guaranteed.
The isInitialized and state properties (and corresponding initialized ()/ stateChanged () signals) allow the state of a 復本 to be determined.
While Qt Remote Objects (QtRO) handles the initialization and synchronization of 復本 objects, there are numerous steps happening behind the scenes which can fail and that aren't encountered in single process Qt applications. See 故障排除 for advice on how to handle such issues when using a remote objects network.
This enum type specifies the various state codes associated with QRemoteObjectReplica states:
| 常量 | 值 | 描述 |
|---|---|---|
QRemoteObjectReplica::Uninitialized
|
0
|
initial value of DynamicReplica, where nothing is known about the replica before connection to source. |
QRemoteObjectReplica::Default
|
1
|
initial value of static replica, where any defaults set in the .rep file are available so it can be used if necessary. |
QRemoteObjectReplica::Valid
|
2
|
indicates the replica is connected, has good property values and can be interacted with. |
QRemoteObjectReplica::Suspect
|
3
|
error state that occurs if the connection to the source is lost after it is initialized. |
QRemoteObjectReplica::SignatureMismatch
|
4
|
error state that occurs if a connection to the source is made, but the source and replica are not derived from the same .rep (only possible for static Replicas). |
This property holds a pointer to the node this object was acquired from.
訪問函數：
| QRemoteObjectNode * | node () const |
| void | setNode (QRemoteObjectNode * node ) |
返迴復本狀態。
此特性保持復本的 QRemoteObjectReplica::State .
訪問函數：
| 狀態 | state () const |
通知程序信號：
| void | stateChanged (State state , State oldState ) |
[signal]
void
QRemoteObjectReplica::
initialized
()
This signal is emitted once the replica is initialized.
另請參閱 isInitialized () 和 stateChanged ().
返迴
true
若此復本已初始化采用數據來自
Source
對象。返迴
false
否則。
另請參閱 state ().
返迴
true
if this replica has been initialized and has a valid connection with the
node
hosting the
Source
。返迴
false
否則。
另請參閱 isInitialized ().
返迴
true
若此復本已初始化采用數據來自
Source
對象。返迴
false
否則。
注意： getter 函數對於特性 state .
另請參閱 isInitialized ().
[signal]
void
QRemoteObjectReplica::
stateChanged
(
State
state
,
State
oldState
)
This signal is emitted whenever a replica's state toggles between QRemoteObjectReplica::State .
The change in state is represented with state and oldState .
注意： 通知程序信號對於特性 state .
另請參閱 state () 和 initialized ().
Blocking call that waits for the replica to become initialized or until the
timeout
(in ms) expires. Returns
true
若復本已初始化，當調用完成時，
false
否則。
若 timeout 是 -1，此函數不會超時。
另請參閱 isInitialized () 和 initialized ().