average joe average joe - 1 month ago 8
C++ Question

How can I debug QXmlSchema's load method?

I'm trying to load the following XML Schema with

QXmlSchema
, however
QXmlSchema::load(const QUrl & source)
always returns
false
. Is there any way to have Qt provide some about what actually went wrong? The schema checks out fine in several validators as far as I can tell (the w3c one provided mysterious output that looked like it passed).

<?xml version="1.0" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

<xsd:element name="message">
<xsd:complexType>
<xsd:choice>

<xsd:element name="login-reply">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:enumeration value="Accepted" />
<xsd:enumeration value="Rejected" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>

<xsd:element name="login-request" >
<xsd:complexType>
<xsd:sequence>
<xsd:element name="username" type="xsd:string" nillable="false"/>
<xsd:element name="password" type="xsd:string" nillable="false"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>

<xsd:element name="logout-request">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="username" type="xsd:string" nillable="false"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>

<xsd:element name="logout-reply">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:enumeration value="Accepted" />
<xsd:enumeration value="Rejected" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>

<xsd:element name="tasklist-request" />

<xsd:element name="tasklist-reply">
<xsd:complexType>
<xsd:sequence minOccurs="1">
<xsd:element name="package" minOccurs="1" nillable="false">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="taskgroup" minOccurs="1" nillable="false">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="id" type="xsd:integer" minOccurs="1" />
<xsd:element name="task" type="xsd:string" minOccurs="1" />
</xsd:sequence>
<xsd:attribute name="id" type="xsd:integer" />
<xsd:attribute name="name" type="xsd:string" />
</xsd:complexType>
</xsd:element>
</xsd:sequence>
<xsd:attribute name="id" type="xsd:integer" />
<xsd:attribute name="name" type="xsd:string" />
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>

<xsd:element name="starttask-request">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="task-id" />
</xsd:sequence>
</xsd:complexType>
</xsd:element>

<xsd:element name="starttask-reply">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:enumeration value="Accepted" />
<xsd:enumeration value="Rejected" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>

</xsd:choice>

</xsd:complexType>
</xsd:element>
</xsd:schema>

Answer

bool QXmlSchema::load() returns false on multiple conditions according to this source documentation

So the answer to my question: No, there is no way to get an error message from Qts parser per Qt 4.7.3 and there is no way via Qts APIs to differentiate between an I/O error and a schema error, since load returns false on both.

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