Hi:
        BOOL bRet;
        bRet=InternetSetOption(0, INTERNET_OPTION_END_BROWSER_SESSION, 0, 0);
        if(!bRet)
                return;
        CString rStr,strErr;
        //GetSpeFolder function get the cookies path.
        if(GetSpeFolder(COOKIES,rStr)){
                LPTSTR lpStr=TransString(rStr);//TransString function convert    
                                                        //CString class data to LPTSTR
        //DelDir function delete the specified folder's contents.
        if(!DelDir(lpStr,GetSafeHwnd(),TRUE,strErr))
                        AfxMessageBox(strErr);
        }
        else
                AfxMessageBox(rStr);
        rStr.ReleaseBuffer();
When execute this program,produce these errors:"Debug Assertion
Failed,...Expression:_BLOCK_TYPE_IS_VALID(pHead->nBlockUse)"
Could you find it?

What line of what file is asserting?  Are the values of rStr, and lpStr what
you expect?

Hi,David Crow
  Thank you in advance.The values of rStr, and lpStr are ok.When execute
the DelDir function,it produce errors.If can delete the cookies folder's
contents by the SHFileOperation() after getting the cookies path?At the
begining,is it ok about the InternetSetOption function ?

Step into the DelDir() function to narrow down the problem code.