C++类内结构体内存溢出问题

C++类内结构体内存溢出问题

void ProbeDecorator::GenSoap()
{
  this->soap = "";
  this->add  = "";
  this->soap.append("<?xml version=\"");
  this->add = this->message->http_content->xml_info->version;
  soap.append(add);
  **cout << this->message->http_content->xml_info->encoding << endl;**
  this->soap+="\"";
  this->soap+=" encoding=\"";
  ;
}

当我将cout << this->message->http_content->xml_info->encoding << endl；这一句放在上面这个位置的时候，不会报错，
但是如果我放在了this->soap+="encoding=\“"；这句后面的话，就会出现Segmentation Fault报错

所有结构体中用不上的指针我全部赋成了0
为什么会报错，如何解决，

代码修改如下：

#include <iostream>
#include <string>
using namespace std;


struct Xml_Info
{
    char *encoding;  
    char *version;

};

struct Http_Content
{
    //char *content_length;  
    Xml_Info *xml_info;
    //Xml_element *envelope;

};

struct Message
{
    //Http_Header *http_header;
    Http_Content *http_content;
};

class ProbeDecorator
{
public:
    Message message;
    void Init();
    void GenSoap();
    string soap, add;
};

void ProbeDecorator::Init()
{

    Http_Content* http_content = new Http_Content;
    Xml_Info* xml_info = new Xml_Info;
    http_content->xml_info = xml_info;
    this->message.http_content = http_content;
    

    xml_info->version = new char[6];
    memset(xml_info->version,0,6);
    memcpy(xml_info->version,"1.0",3);
    
    xml_info->encoding = new char[6];
    memset(xml_info->encoding,0,6);
    memcpy(xml_info->encoding,"utf-8",5);

    

    cout << this->message.http_content->xml_info->version << endl;
    cout << this->message.http_content->xml_info->encoding << endl;
}


void ProbeDecorator::GenSoap()
{
    cout << this->message.http_content->xml_info->version << endl;
    cout << this->message.http_content->xml_info->encoding << endl;
    ;
}//你看看我这样申请这样对么


int main()
{

    ProbeDecorator c;
    c.Init();
    c.GenSoap();

    return 0;
}

更正一下：
如果我将cout << this->message->http_content->xml_info->encoding << endl;放在soap.append(add)；后面的话也会报Segmentation Fault而只有放在this->add = this->message->http_content->xml_info->version；后面不会报错

+=是c#的语法，c++不能这样字符串拼接

具体为何错误，请学会调试，看看是否有空指针，或者访问越界

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