使用 xerces for c++ 调用 getDocument 时出现分段错误

Question

再会。我有 parser.ha Sample.cpp（作为父节点）和 main.cpp。我得到了 获取 getDocument 时出现分段错误。有人可以帮助我吗...这是我的代码：

parser.h

int Parser::Load(const char* xmlFile) {  
    try {  
        XMLPlatformUtils::Initialize();  
    }  
    catch (const XMLException& toCatch) {  
        char* message = XMLString::transcode(toCatch.getMessage());

        cout << "Error during initialization! :\n"  
             << message << "\n";  

        XMLString::release(&message);  
        return 1;  
    }

    XercesDOMParser* parser = new XercesDOMParser();  
    parser->setValidationScheme(XercesDOMParser::Val_Always);  
    parser->setDoNamespaces(true);  
    ErrorHandler* errHandler = (ErrorHandler*) new HandlerBase();  
    parser->setErrorHandler(errHandler);  

    try {  
        parser->parse(xmlFile);  
    }
    catch (const XMLException& toCatch) {  
        char* message = XMLString::transcode(toCatch.getMessage());  

        cout << "Exception message is: \n"  
             << message << "\n";  

        XMLString::release(&message);  
        return -1;  
    }  
    catch (const DOMException& toCatch) {  
        char* message = XMLString::transcode(toCatch.msg);  

        cout << "Exception message is: \n"  
             << message << "\n";  

        XMLString::release(&message);  
        return -1;  
    }
    catch (...) {  
        cout << "Unexpected Exception \n";  
        return -1;  
    }  
}  

sample.cpp

void Sample::getXmlNodes(ParseXml* xmlParser){  
    map<std::string, std::string> attribList;  
    xmlParser->xmlDoc = xmlParser->parser->getDocument();  
    xmlParser->xmlNode = xmlParser->xmlDoc->getFirstChild();  
    attribList = xmlParser->getNodeAttribute(xmlParser->xmlNode);  
}  

ma​​in.cpp

#include "parser.h"  
#include "sample.cpp"

int main(int argc,char **argv){  
    const char* xmlString="sample.xml";  
    Parser* xmlObj;  
    Sample sampObj;

    xmlObj->Load(xmlString);  
    sampObj.getXmlNodes(xmlObj);  

    cout << "Done creating object..." << endl;  

    xmlObj->Cleanup();  
    return 0;  
}

我不知道我的代码出了什么问题代码 ...

Answer 1

您没有为 xmlObj objetc 分配内存：

Parser* xmlObj;
Sample sampObj;  
xmlObj->Load(xmlString);   // SIGSEV here, you have no object to invoke

必须替换为：

Parser xmlObj;  
Sample sampObj;  
xmlObj.Load(xmlString);
sampObj.getXmlNodes(&xmlObj);