Pass QXmlStreamReader Instance to Class
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I am trying to read an XML document using QXmlStreamReader. I am running into issues when I try to pass a pointer to the reader to other classes. I create an instance of the reader in one class. That class reads the XML until it comes to a block defining a new class. I create and instance of the new class and then call a function in that class to continue reading the XML specific for it. For instance:
@void SF_UnitClass::ReadModes()
{
Q_ASSERT(XML.isStartElement() && XML.name() == MODES);
NumModes = XML.attributes().value(COUNT).toInt();
while (XML.readNextStartElement())
{
if (XML.name() == MODE)
{
ModeClass* pMode = new ModeClass(this);
ModeList += XML.attributes().value(ID).toString();
pMode->ReadXML(&XML);
{
}
}
else
{
XML.raiseError(QObject::tr("Something other than Mode block encountered in Modes block"));
}
}
}
@
This works part way through the file but then the reader seems to forget what level its at. readNextStartElement() returns false when it shouldn't. The file is fine as I took a TreeWidget example and customized it for my use and it reads the whole file just fine. I am thinking that for some reason I cannot pass a pointer to the reader to another classes function to continue reading the XML? -
You can pass. We use everywhere. You can pass. Some of the sample methods we have are
@ void readCompanyNew(QXmlStreamReader *par);
void readProjectNew(QXmlStreamReader *par);I am calling them like
readCompanyNew(&parser);
readProjectNew(&parser);@
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Thanks, that is good to know. I will keep digging into this then.
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if you want the complete sample, drop email to me. I will send you the complete solution dump.
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Thanks but I think its in my code somewhere but I am missing it. I am finding it hard to debug because I don't know why readNextStartElement() is returning a false where it should not. Here is a sample of my XML. My code reads all the <Channel> blocks fine. It then it reads the <Servos> start element and the first <Servo> block fine but then gets a false from readNextStartElement() when it should read the next <Servo> start element and goes all the way back up to my Mode loop. Just need to figure out why it does not read the second servo block. Thanks.
@<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xml>
<SmartFlyUnit version="1.0">
<UnitName>PowerExpander Eq10E</UnitName>
<UnitCode>PE-5</UnitCode>
<UnitID>1</UnitID>
<MinRev>1.0</MinRev>
<MaxRev>1.9</MaxRev>
<Servos>36</Servos>
<Outputs>32</Outputs>
<UnitMode>Chan</UnitMode>
<Modes Count="2">
<Mode ID="Chan">
<Receivers>1</Receivers>
<Channels Count="10">
<Channel ID="0">
<UserName></UserName>
<EndPtHold>Off</EndPtHold>
<ServoPri>Off</ServoPri>
</Channel>
<Channel ID="1">
<UserName></UserName>
<EndPtHold>Off</EndPtHold>
<ServoPri>Off</ServoPri>
</Channel>
</Channels>
<Servos Count="36">
<Servo ID="0">
<Offset>0</Offset>
<PosFact>1.0000</PosFact>
<NegFact>1.0000</NegFact>
<Reverse>Off</Reverse>
<SecServo>0xFF</SecServo>
<Unit>0xFF</Unit>
<Ser1>0xFF</Ser1>
<Ser2>0xFF</Ser2>
<Ser3>0xFF</Ser3>
</Servo>
<Servo ID="1">
<Offset>0</Offset>
<PosFact>1.0000</PosFact>
<NegFact>1.0000</NegFact>
<Reverse>Off</Reverse>
<SecServo>0xFF</SecServo>
<Unit>0xFF</Unit>
<Ser1>0xFF</Ser1>
<Ser2>0xFF</Ser2>
<Ser3>0xFF</Ser3>
</Servo>
</Servos>
</Mode>
</Modes>
<MCUs Count="1">
<MCU ID="0">
<FileName>/PE-5/PE-5_M0_1_00.sffw</FileName>
</MCU>
</MCUs>
<FPGAs Count="1">
<FPGA ID="0">
<Configs Count="2">
<Config ID="0">
<FileName>/PE-5/PE-5_F0C0_1_00.sffw</FileName>
</Config>
<Config ID="1">
<FileName>/PE-5/PE-5_F0C1_1_00.sffw</FileName>
</Config>
</Configs>
</FPGA>
</FPGAs>
</SmartFlyUnit>
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OK, solved. My inexperience in dealing with the XML reader. I missed a case in my switch statement which caused an item to be missed and put things out of sequence. I need to add a default with a skipCurrentElement or raise an error. Thanks for all the feedback, it helped me catch this.
