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POWhy I am getting a Heap Corruption Error?
 

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  1. POWhy I am getting a Heap Corruption Error?
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    <p>I am new to C++. I am getting HEAP CORRUPTION ERROR. Any help will be highly appreciated. Below is my code </p> <pre><code>class CEntity { //some member variables CEntity(string section1,string section2); CEntity(); virtual ~CEntity(); //pure virtual function .. virtual CEntity* create()const = 0; }; </code></pre> <p>I derive CLine from CEntity as below </p> <pre><code>class CLine:public CEntity { // Again some variables ... // Constructor and destructor CLine(string section1,string section2); CLine(); ~CLine(); CLine* Create() const; } // CLine Implementation CLine::CLine(string section1,string section2) : CEntity(section1,section2){}; CLine::CLine(); CLine* CLine::create() const {return new CLine();} </code></pre> <p>I have another class CReader which uses CLine object and populates it in a multimap as below </p> <pre><code>class CReader { public: CReader(); ~CReader(); multimap&lt;int,CEntity*&gt;m_data_vs_entity; }; //CReader Implementation CReader::CReader() { m_data_vs_entity.clear(); }; CReader::~CReader() { multimap&lt;int,CEntity*&gt;::iterator iter; for(iter = m_data_vs_entity.begin();iter!=m_data_vs_entity.end();iter++) { CEntity* current_entity = iter-&gt;second; if(current_entity) delete current_entity; } m_data_vs_entity.clear(); } </code></pre> <p>I am reading the data from a file and then populating the CLine Class.The map gets populated in a function of CReader class. Since CEntity has a virtual destructor, I hope the piece of code in CReader's destructor should work. In fact, it does work for small files but I get HEAP CORRUPTION ERROR while working with bigger files. If there is something fundamentally wrong, then, please help me find it, as I have been scratching my head for quit some time now.<br> Thanks in advance and awaiting reply,<br> Regards,<br> Atul </p> <p>Continued from Y'day : Further studying this in detail I now have realized that Heap allocation error in my case is because I am allocating something, and then overwriting it with a higher size. Below is the code where in my data gets populated in the constructor.</p> <pre><code>CEntity::CEntity(string section1,string section2) { size_t length; char buffer[9]; //Entity Type Number length = section1.copy(buffer,8,0); buffer[length]='\0'; m_entity_type = atoi(buffer); //Parameter Data Count length = section1.copy(buffer,8,8); buffer[length]='\0'; m_param_data_pointer = atoi(buffer); //.... like wise .... } </code></pre> <p>I am getting the values at a fixed interval of 8 chars and I am adding a '\0' so this, i guess will take care of any garbage value that I encounter. </p> <p>About <strong>Heap allocation error: after normal block (XXX) at XXX, CRT detected that application wrote to memory after end of Heap buffer.</strong> Mostly, Heap allocation errors occur somewhere else than where it crashes. I would appreciate if some one here would help me, how to make use of this normal block and the address. Thanks,</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
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    1. USlaalto
    1. USAtul
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    1. VO
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      1. POWhy I am getting a Heap Corruption Error?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
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      1. POWhy I am getting a Heap Corruption Error?
      1. This table or related slice is empty.
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    3. VO
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      1. POWhy I am getting a Heap Corruption Error?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COis it actual code ? if so why `create` is a non-static member function? how is it supposed to be used?
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      1. POWhy I am getting a Heap Corruption Error?
      1. USNaveen
    2. COalso can you show us the code which populates `m_data_vs_entity` as I have a feeling that you might be putting the same pointer twice into the map.
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      1. POWhy I am getting a Heap Corruption Error?
      1. USNaveen
    3. CO@Naveen, I think his `create()` is an example of the virtual constructor idiom -- it's not supposed to be static.
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      1. POWhy I am getting a Heap Corruption Error?
      1. USPeter Alexander
 

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