qt isvalid
bool, isValid() const. int, left() const. const QAbstractItemModel ... bool QItemSelectionRange::isValid() const. Returns true if the selection range is valid; ... ,bool QMetaProperty::isValid() const. Returns true if this property is valid (readable); otherwise returns false . See also isReadable(). ,bool QModelIndex::isValid() const. Returns true if this model index is valid; otherwise returns false . A valid index belongs to a model, and has non-negative row ... ,QNetworkCacheMetaData::QNetworkCacheMetaData(). Constructs an invalid network cache meta data. See also isValid(). ,bool QPersistentModelIndex::isValid() const. Returns true if this persistent model index is valid; otherwise returns false . A valid index belongs to a model, and ... ,bool, isValid() const ... valid signal of object), an explanatory warning message will be output using qWarning() and subsequent calls to isValid() will return false. ,The isValid() function determines if a size is valid. A valid size has both width and height greater than or equal to zero. The isEmpty() function returns true if either ... ,bool QSqlError::isValid() const. Returns true if an error is set, otherwise false. Example: QSqlQueryModel model; model.setQuery("select * from myTable"); if ... ,bool, isValid() const. void, swap(QSqlRelation &other) ... return an empty string. See also isValid(). ... bool QSqlRelation::isValid() const. Returns true if the ... , 我曾经多次在Qt socket 编程中使用tcpSocket.isValid 来判断我当前的连接是否可用，最近写程序时才发现此法并不妥当。
| 相關軟體 Qt (32-bit) 資訊 | |
|---|---|
 qt isvalid 相關參考資料
QItemSelectionRange Class | Qt Core 5.13.0 - Qt Documentation
bool, isValid() const. int, left() const. const QAbstractItemModel ... bool QItemSelectionRange::isValid() const. Returns true if the selection range is valid; ... https://doc.qt.io QMetaProperty Class | Qt Core 5.13.0 - Qt Documentation
bool QMetaProperty::isValid() const. Returns true if this property is valid (readable); otherwise returns false . See also isReadable(). https://doc.qt.io QModelIndex Class | Qt Core 5.13.0 - Qt Documentation
bool QModelIndex::isValid() const. Returns true if this model index is valid; otherwise returns false . A valid index belongs to a model, and has non-negative row ... https://doc.qt.io QNetworkCacheMetaData Class | Qt Network 5.13.0 - Qt Documentation
QNetworkCacheMetaData::QNetworkCacheMetaData(). Constructs an invalid network cache meta data. See also isValid(). https://doc.qt.io QPersistentModelIndex Class | Qt Core 5.13.0 - Qt Documentation
bool QPersistentModelIndex::isValid() const. Returns true if this persistent model index is valid; otherwise returns false . A valid index belongs to a model, and ... https://doc.qt.io QSignalSpy Class | Qt Test 5.13.0 - Qt Documentation
bool, isValid() const ... valid signal of object), an explanatory warning message will be output using qWarning() and subsequent calls to isValid() will return false. https://doc.qt.io QSizeF Class | Qt Core 5.13.0 - Qt Documentation
The isValid() function determines if a size is valid. A valid size has both width and height greater than or equal to zero. The isEmpty() function returns true if either ... https://doc.qt.io QSqlError Class | Qt SQL 5.13.0 - Qt Documentation
bool QSqlError::isValid() const. Returns true if an error is set, otherwise false. Example: QSqlQueryModel model; model.setQuery("select * from myTable"); if ... https://doc.qt.io QSqlRelation Class | Qt SQL 5.13.0 - Qt Documentation
bool, isValid() const. void, swap(QSqlRelation &other) ... return an empty string. See also isValid(). ... bool QSqlRelation::isValid() const. Returns true if the ... https://doc.qt.io Qt 菜鸟的坑QAbstractSocket::isValid() - 漫不经心- CSDN博客
我曾经多次在Qt socket 编程中使用tcpSocket.isValid 来判断我当前的连接是否可用，最近写程序时才发现此法并不妥当。 https://blog.csdn.net |