Break class execution in Thread

Hello,

I have a thread who executes a class and waits the execution. This
thread have a time-out break, which cancels the execution if the time-
out ocurr.

The problem is the class continue executing and sometimes this causes
a exception. How can I resolve this?

I put the code to show this below. I use Sleeps to the class continue
executing.

//////////
#include <stdio.h>
#define _AFXDLL
#include <afx.h>

class CAbc
{
public:
    int a[11];
    int b;
    void PreencheLista()
    {
        for(int i = 0; i<11; i++)
        {
            a[i] = i;
            Sleep(1000);
        }
    };

    int GetItem(int i)
    {
        return a[i];
    };

    bool Proc()
    {
        PreencheLista();
        b = GetItem(2500);

        return true;
    };

    int Response()
    {
        return b;
    };
};

class CSendFile
{
public:
    CSendFile(void)
    {

    };

    virtual ~CSendFile(void)
    {

    };

    CAbc* m_pAbc;

    bool Send()
    {
        m_pAbc = new CAbc();

        HANDLE hThrd = NULL;
        DWORD dwThrd;

        hThrd = CreateThread(NULL, 0, _OnLineSearchThrd, this, 0, &dwThrd);

        if(hThrd == NULL)
        {
            CloseHandle(hThrd);
        }

        DWORD dRet = WaitForSingleObject(hThrd, 10000);

        CloseHandle(hThrd);

        delete m_pAbc;

        return true;

    };

    void DoThread()
    {
        _DoSearchOnline();
    };

protected:
    void _DoSearchOnline()
    {
        if(m_pAbc->Proc())
        {
            m_iInt = m_pAbc->Response();
        }
    };

    static DWORD WINAPI _OnLineSearchThrd( LPVOID lpParam )
    {
        CSendFile *pOnline = (CSendFile*)lpParam;
        pOnline->DoThread();

        return 0;
    };

    CString m_sURL;
    int m_iInt;
    CString m_sFile;
};

int main()
{
    CSendFile f;
    f.Send();

    Sleep(2000);
    return 0;
}
///////////////////