我正在使用 QXmlStreamReader 来处理 XML 文件。读取循环非常简单：
if ( !file.open(QFile::ReadOnly | QFile::Text) ) {
strErrors.append(mcszConfigFile);
strErrors.append("\n\nDoes not exists!\n\n");
}
xmlrdr.setDevice(&file);
xmlrdr.readNext();
blnRootFound = false;
while( !xmlrdr.atEnd() ) {
/* [Edit] This shouldn't be here! if ( xmlrdr.isStartElement() ) */{
QXmlStreamAttributes attrs = xmlrdr.attributes();
QStringRef srfNodeName = xmlrdr.name();
bool blnEndElement = xmlrdr.isEndElement();
bool blnStartElement = xmlrdr.isStartElement();
bool blnInvalid = true;
if ( attrs.length() > 0 ) {
QString strID, strNodeName = srfNodeName.toString();
if ( attrs.hasAttribute(mcszXMLattrID) == false ) {
strErrors.append("Node: ");
strErrors.append(qPrintable(srfNodeName.toString()));
strErrors.append("Has no id!\n");
break;
}
strID = attrs.value(mcszXMLattrID).toString();
if ( strNodeName.compare(mcszXMLnodeRoot) == 0 ) {
blnRootFound = true;
blnInvalid = false;
mstrRootID = strID;
} else if ( strNodeName.compare(mcszXMLnodeButton) == 0
|| strNodeName.compare(mcszXMLnodeButtonBar) == 0
|| strNodeName.compare(mcszXMLnodeOption) == 0 ) {
blnInvalid = false;
} else if ( strNodeName.compare(mcszXMLnodeControl) == 0 ) {
for( int t=0; mcpszValidControlTypes[t]!=NULL; t++ ) {
if ( strID.compare(mcpszValidControlTypes[t]) == 0 ) {
blnInvalid = false;
break;
}
}
}
if ( strID.length() > 0 && blnInvalid == false ) {
clsXMLnode objNode = clsXMLnode(strNodeName, &attrs, this);
msmapNodes.insert(std::pair<QString, clsXMLnode>(strID, objNode));
msmapAreas.insert(std::pair<QString, QRect>(strID, objNode.rctGetGeom()));
if ( blnStartElement == true ) {
}
}
}
}
xmlrdr.readNext();
}
if ( file.isOpen() ) {
file.close();
}
我正在阅读的 XML：
<?xml version="1.0" encoding="utf-8"?>
<!--
Node: gui
Attrbuttes: left, right, top and bottom defines the pixel white space to allow
from the edge of the display
language, should be set to the appropriate country code, an XML file named using
the country code must exist, e.g. 44.xml
//-->
<gui id="root" bottom="0" left="0" right="0" top="24" language="44">
<control id="trainstrip"
x="(center:SCREEN) - (25%:SCREEN_WIDTH)" y="(top:SCREEN)" height="40px" width="(50%:SCREEN_WIDTH)"/>
<control id="elevationstrip"
x="(left:trainstrip) - 56px" y="(top:trainstrip) + (height:trainstrip) + 24px" width="56px" height="{75%:SCREEN_HEIGHT}"/>
<control id="lofmimics"
color_arc="#ffaaaaaa"
color_axis="#fff0000"
color_bg="#ffaaaaaa"
color_needle="#ffffff00"
color_min_limit="#ffbbbb00"
color_max_limit="#ffcc00cc"
color_port="#ff00aa00"
color_starboard="'#ffaa0000"
elevation_height="275px"
elevation_mech_max="85"
elevation_mech_min="-10"
elevation_max="85"
elevation_margin_left="64px"
elevation_margin_bottom="64px"
elevation_min="-10"
elevation_pensize_limit="3"
elevation_pensize_reading="3"
elevation_width="[elevation_height]"
elevation_x="0px"
elevation_y="0px"
training_mech_starboard="170"
training_mech_port="-170"
training_pensize_port="5"
training_pensize_starboard="5"
training_pensize_limit="3"
training_pensize_reading="3"
training_starboard="150"
training_port="-150"
training_width="(left:elevationstrip)"
training_height="([training_width])"
training_x="([elevation_x])"
training_y="([elevation_height])"
x="(left:SCREEN)"
width="([x]:elevationstrip)"
height="([training_height]) + ([elevation_height])"
y="(bottom:SCREEN) - ([height])"/>
<buttonbar id="modes"
height="50%"
width="100px"
x="(RIGHT:SCREEN) - ([width])"
y="(TOP:SCREEN)"
title="MODE"
color_bg="#ffaaaaaa"
border="inset:#ffcccccc,#ff333333"
button_height="24px"
button_width="80px"
vertical_space="4px">
<button id="btnsetup" color_bg="#ff3399ff" x="0px" y="{top:modes}">
<option value="0" text="operate<"/>
<option value="1" text="setup"/>
<option value="2" text="install"/>
<option value="3" text="startup"/>
<option value="4" text="shutdown"/>
</button>
</buttonbar>
</gui>
我遇到的问题是标志 blnEndElement 和 blnStartElement 在读取文件时似乎不能准确反映正确的状态，blnEndElement 始终为假，blnStartElement 始终为真。
我想要做的是在读取和处理 XML 的同时建立节点/元素层次结构。