'How to debug Buffer Overrun Issues' erro. Can someone help me to fix my code? [closed]

Question

I have this code that reads a file that already exists, but in the first "for" when it read the file and copies it to the "struct" when the index is 1, I get an error:

(A buffer Read overrun has occurred in File.exe Which has corrupted the program's internal state. Press Break to debug the program or Continue to terminate the program.

For more details please see Help topic 'How to debug Buffer Overrun Issues'.)

#include "lerArquivo.h"

void main()
{
    int nQtdRegistro;
    int i;

    REGISTRO stRegistro;
    REGISTRO *ptrSalva;
    REGISTRO *ptrVetRegistro;
    LABEL stLabel;
    FILE *fdArq;

    fdArq = fopen(CAMINHO_NOME_ARQ, "rb");
    if(fdArq == NULL)
    {
        cout << "Erro na abertura do arquivo: " << CAMINHO_NOME_ARQ<< endl;     
    }//if
    if(fread(&stLabel, sizeof(stLabel), 1 , fdArq) == 0)
    {
        fclose(fdArq);      // fechar o arquivo
        cout << "Erro fread" << endl;
        PAUSA;
        exit(-1);;  
    }

    ptrSalva = ptrVetRegistro = (REGISTRO *) malloc(stLabel.nQtdeRegistros * sizeof(REGISTRO));
    if(ptrSalva == NULL)
    {
        cout<< "Não tem memoria para conter " << stLabel.nQtdeRegistros << " registros" << endl;
        PAUSA;
        exit(-1);
    }

    for(i = 0; i < stLabel.nQtdeRegistros; i++)
        {
            if(fread(&stRegistro + i, sizeof(stRegistro), 1 , fdArq) == 0)
            {
                fclose(fdArq);      // fechar o arquivo
                cout << "Erro fread" << endl;
                PAUSA;
                exit(-1);   
            }       
            memcpy(ptrVetRegistro + (i * sizeof(REGISTRO)) , &stRegistro, sizeof(REGISTRO));
        }// for

    for(i = 0; i < stLabel.nQtdeRegistros; i++)
    {
        cout << "Descrição: " << ptrVetRegistro[i].cDescricao << "\n";
        cout << "Preço Unitario: " << ptrVetRegistro[i].dPrecoUnitario << "\n";
        cout << "Quantidade: " << ptrVetRegistro[i].dQuatindade << "\n";
    }
    fclose(fdArq);
    free(ptrSalva);
}

Answer 1

The same code written in C++ would look like this:

int main()
{
    try
    {
        std::ifstream file("CAMINHO_NOME_ARQ", std::ios::binary);

        LABEL stLabel;
        file >> stLabel;

        std::vector<REGISTRO> salva;
        std::copy(std::istream_iterator<REGISTRO>, std::istream_iterator<REGISTRO>(),
                  std::back_inserter(salvo)
                 );

        std::copy(salvo.begin(), salvo.end(),
                  std::ostream_iterator<REGISTRO_Pretty>(std::cout)
                 );
    }
    catch(std::exception const& e)
    {
        std::cerr << "Exception: " << e.what() << "\n";
    }
}