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4.2

Thread problem: causing obscene memory leaks !

Asked by mrwad99 in Windows MFC Programming

Tags: memory, leak

Ah hello.

Right, I am creating a thread in my app that periodically checks the content of a dynamically alterable website. The end result of all this is that the application should be able to check if it "authorised" to run or not; if it deems that it is not then it shuts itself down blah blah...

This is the code I create the thread with:

BOOL CGui4UnexApp::InitInstance()
{
// usual stuff
      CWinThread* pThread = AfxBeginThread(ThreadFunc, NULL);
}

and this is the thread function

UINT CGui4UnexApp::ThreadFunc(LPVOID pParam)
{
      CInternetSession session;
      CStdioFile* pFile = NULL;
      CString strLine;

      while (TRUE) {
            try {
                  pFile = session.OpenURL("http://www.yahoo.com", 0, INTERNET_FLAG_TRANSFER_BINARY
                                                      | INTERNET_FLAG_KEEP_CONNECTION);
                  pFile->ReadString(strLine);
                  TRACE("\n%s", strLine);
                  pFile->Close();
            } catch (CInternetException* e) {
                  e->Delete();
            }
            pFile->Close();
            session.Close();
            //Sleep(10000);
      }
      return 0;
}

All that the code does at the minute is get the first line of the Yahoo! web page source and output it. Nothing special as yet. However when running this code through the debugger I get loads of memory leaks, pertaining to strcore.cpp and inet.cpp, VC++ gives me constant first chance exception errors and I get the CInternetException error thrown all but the first time. Notably, the exception does not get thrown if I move the variable declarations into the while loop....

These memory leaks do not occur when I do not run the thread. Try it by plugging this code into a simple app wizard MDI app if you will.

I cannot see what these leaks or exceptions are coming from. Can you ?

TIA

View the Solution FREE for 30 Days

20091021-EE-VQP-81

Thread problem: causing obscene memory leaks !

Asked by mrwad99 in Windows MFC Programming

Tags: memory, leak

About this solution