QXmlSchema 类提供对 W3C XML 模式的加载和验证。 更多...
| 头： | #include <QXmlSchema> |
| qmake: | QT += xmlpatterns |
| Since: | Qt 4.6 |
该类在 Qt 4.6 引入。
注意： 此类的所有函数 可重入 .
| QXmlSchema (const QXmlSchema & other ) | |
| QXmlSchema () | |
| QXmlSchema & | operator= (const QXmlSchema & other ) |
| ~QXmlSchema () | |
| QUrl | documentUri () const |
| bool | isValid () const |
| bool | load (const QUrl & source ) |
| bool | load (QIODevice * source , const QUrl & documentUri = QUrl()) |
| bool | load (const QByteArray & data , const QUrl & documentUri = QUrl()) |
| QAbstractMessageHandler * | messageHandler () const |
| QXmlNamePool | namePool () const |
| QNetworkAccessManager * | networkAccessManager () const |
| void | setMessageHandler (QAbstractMessageHandler * handler ) |
| void | setNetworkAccessManager (QNetworkAccessManager * manager ) |
| void | setUriResolver (const QAbstractUriResolver * resolver ) |
| const QAbstractUriResolver * | uriResolver () const |
The QXmlSchema class loads, compiles and validates W3C XML Schema files that can be used further for validation of XML instance documents via QXmlSchemaValidator .
The following example shows how to load a XML Schema file from the network and test whether it is a valid schema document:
QUrl url("http://www.schema-example.org/myschema.xsd");
QXmlSchema schema;
if (schema.load(url) == true)
qDebug() << "schema is valid";
else
qDebug() << "schema is invalid";
This class is used to represent schemas that conform to the XML Schema 1.0 specification.
另请参阅 QXmlSchemaValidator and XML 模式验证范例 .
Constructs a QXmlSchema that is a copy of other . The new instance will share resources with the existing schema to the extent possible.
Constructs an invalid, empty schema that cannot be used until load () 被调用。
Copies the resources of other into this instance, sharing them to the extent possible.
该函数在 Qt 5.4 引入。
销毁此 QXmlSchema .
Returns the document URI of the schema or an empty URI if no schema has been set.
Returns true if this schema is valid. Examples of invalid schemas are ones that contain syntax errors or that do not conform the W3C XML Schema specification.
设置此 QXmlSchema to a schema loaded from the source URI.
若模式
是无效的
,
false
被返回且行为未定义。
范例：
QUrl url("http://www.schema-example.org/myschema.xsd");
QXmlSchema schema;
if (schema.load(url) == true)
qDebug() << "schema is valid";
else
qDebug() << "schema is invalid";
另请参阅 isValid ().
设置此 QXmlSchema to a schema read from the source device. The device must have been opened with at least QIODevice::ReadOnly .
documentUri represents the schema obtained from the source device. It is the base URI of the schema, that is used internally to resolve relative URIs that appear in the schema, and for message reporting.
若
source
is
null
或不可读，或者若
documentUri
不是有效 URI，行为未定义。
若模式
是无效的
,
false
被返回且行为未定义。
范例：
QFile file("myschema.xsd");
file.open(QIODevice::ReadOnly);
QXmlSchema schema;
schema.load(&file, QUrl::fromLocalFile(file.fileName()));
if (schema.isValid())
qDebug() << "schema is valid";
else
qDebug() << "schema is invalid";
另请参阅 isValid ().
设置此 QXmlSchema to a schema read from the data
documentUri represents the schema obtained from the data . It is the base URI of the schema, that is used internally to resolve relative URIs that appear in the schema, and for message reporting.
若 documentUri 不是有效 URI，行为未定义。
若模式
是无效的
,
false
被返回且行为未定义。
范例：
QByteArray data( "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
"<xsd:schema"
" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\""
" xmlns=\"http://www.qt-project.org/xmlschematest\""
" targetNamespace=\"http://www.qt-project.org/xmlschematest\""
" version=\"1.0\""
" elementFormDefault=\"qualified\">"
"</xsd:schema>" );
QXmlSchema schema;
schema.load(data);
if (schema.isValid())
qDebug() << "schema is valid";
else
qDebug() << "schema is invalid";
Returns the message handler that handles compile and validation messages for this QXmlSchema .
另请参阅 setMessageHandler ().
Returns the name pool used by this QXmlSchema for constructing 名称 . There is no setter for the name pool, because mixing name pools causes errors due to name confusion.
Returns the network manager, or 0 if it has not been set.
另请参阅 setNetworkAccessManager ().
改变 message handler for this QXmlSchema to handler . The schema sends all compile and validation messages to this message handler. QXmlSchema 未拥有所有权对于 handler .
Normally, the default message handler is sufficient. It writes compile and validation messages to stderr . The default message handler includes color codes if stderr can render colors.
当 QXmlSchema calls QAbstractMessageHandler::message (), the arguments are as follows:
| message() argument | Semantics |
|---|---|
| QtMsgType type | 仅 QtWarningMsg and QtFatalMsg are used. The former identifies a warning, while the latter identifies an error. |
| const QString & description | An XHTML document which is the actual message. It is translated into the current language. |
| const QUrl &identifier | Identifies the error with a URI, where the fragment is the error code, and the rest of the URI is the error namespace. |
| const QSourceLocation & sourceLocation | Identifies where the error occurred. |
另请参阅 messageHandler ().
将网络管理器设为 manager . QXmlSchema 未拥有所有权对于 manager .
另请参阅 networkAccessManager ().
将 URI (统一资源标识符) 解析器设为 resolver . QXmlSchema 未拥有所有权对于 resolver .
另请参阅 uriResolver ().
Returns the schema's URI resolver. If no URI resolver has been set, Qt XML Patterns will use the URIs in schemas as they are.
The URI resolver provides a level of abstraction, or polymorphic URIs . A resolver can rewrite logical URIs to physical ones, or it can translate obsolete or invalid URIs to valid ones.
When Qt XML Patterns calls QAbstractUriResolver::resolve () the absolute URI is the URI mandated by the schema specification, and the relative URI is the URI specified by the user.
另请参阅 setUriResolver ().