simple isapi extension : memory leak detected
From: Marty Sheffield (someone_at_online.com)
Date: 03/25/05
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Date: Fri, 25 Mar 2005 12:01:06 -0800
I started by trying to figure out where a memory leak in my isapi
extension was coming from, so I built a super simple MFC isapi with the
wizard (using VS .net 2002). It only has 3 parse commands; default,
emptyTest, and variableTest. Both default & emptyTest take no
parameters, the latter takes one. Whenever I call the methods that do
not take variables, I dont see a leak. When i call the variable test
(/testIsapi.dll?variableTest&var=test), CRT detects leaks when the dll is
unloaded (there's always 4 reported leaks). I'm wondering what gives,
and what I can do to correct this, I've been googling all day.
<the error>
[2248] Detected memory leaks!
[2248] Dumping objects ->
[2248] {55}
[2248] normal block at 0x00A64090, 8 bytes long.
[2248] Data: < > CD CD CD CD CD CD CD CD
[2248] {54}
[2248] normal block at 0x00A64058, 8 bytes long.
[2248] Data: <(@ > 28 40 A6 00 00 00 00 00
[2248] {53}
[2248] normal block at 0x00A64028, 4 bytes long.
[2248] Data: <var > 76 61 72 00
[2248] {52}
[2248] normal block at 0x00A62958, 16 bytes long.
[2248] Data: < X@ @ > 01 00 00 00 01 00 00 00 58 40 A6 00 90
40 A6 00
<testIsapi.cpp>
// testIsapi.cpp - Implementation file for ISAPI
// testIsapi Extension
#include "stdafx.h"
#include "testIsapi.h"
// The one and only CWinApp object
// NOTE: You may remove this object if you alter your project to no
// longer use MFC in a DLL.
CWinApp theApp;
// command-parsing map
BEGIN_PARSE_MAP(CtestIsapiExtension, CHttpServer)
// TODO: insert your ON_PARSE_COMMAND() and
// ON_PARSE_COMMAND_PARAMS() here to hook up your commands.
// For example:
ON_PARSE_COMMAND(Default, CtestIsapiExtension, ITS_EMPTY)
ON_PARSE_COMMAND(emptyTest, CtestIsapiExtension, ITS_EMPTY)
ON_PARSE_COMMAND(variableTest, CtestIsapiExtension, ITS_PSTR)
ON_PARSE_COMMAND_PARAMS("var=~")
DEFAULT_PARSE_COMMAND(Default, CtestIsapiExtension)
END_PARSE_MAP(CtestIsapiExtension)
// The one and only CtestIsapiExtension object
CtestIsapiExtension theExtension;
// CtestIsapiExtension implementation
CtestIsapiExtension::CtestIsapiExtension()
{
_CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );
}
CtestIsapiExtension::~CtestIsapiExtension()
{
_CrtDumpMemoryLeaks();
}
BOOL CtestIsapiExtension::GetExtensionVersion(HSE_VERSION_INFO* pVer)
{
// Call default implementation for initialization
CHttpServer::GetExtensionVersion(pVer);
// Load description string
TCHAR sz[HSE_MAX_EXT_DLL_NAME_LEN+1];
ISAPIVERIFY(::LoadString(AfxGetResourceHandle(),
IDS_SERVER, sz, HSE_MAX_EXT_DLL_NAME_LEN));
_tcscpy(pVer->lpszExtensionDesc, sz);
return TRUE;
}
BOOL CtestIsapiExtension::TerminateExtension(DWORD dwFlags)
{
// extension is being terminated
//TODO: Clean up any per-instance resources
return TRUE;
}
// CtestIsapiExtension command handlers
void CtestIsapiExtension::Default(CHttpServerContext* pCtxt)
{
StartContent(pCtxt);
WriteTitle(pCtxt);
*pCtxt << _T("This is the default message");
EndContent(pCtxt);
}
// CtestIsapiExtension command handlers
void CtestIsapiExtension::emptyTest(CHttpServerContext* pCtxt)
{
StartContent(pCtxt);
WriteTitle(pCtxt);
*pCtxt << _T("This is the emptyTest page<br>\r\n");
EndContent(pCtxt);
}
// CtestIsapiExtension command handlers
void CtestIsapiExtension::variableTest(CHttpServerContext* pCtxt, LPTSTR
pszVar)
{
StartContent(pCtxt);
WriteTitle(pCtxt);
*pCtxt << _T("This is the variableTest page<br>\r\n");
*pCtxt << _T(pszVar);
*pCtxt << _T("<br>\r\n");
EndContent(pCtxt);
}
// If your extension will not use MFC, you'll need this code to make
// sure the extension objects can find the resource handle for the
// module. If you convert your extension to not be dependent on MFC,
// remove the comments around the following AfxGetResourceHandle()
// and DllMain() functions, as well as the g_hInstance global.
/****
static HINSTANCE g_hInstance;
HINSTANCE AFXISAPI AfxGetResourceHandle()
{
return g_hInstance;
}
BOOL WINAPI DllMain(HINSTANCE hInst, ULONG ulReason,
LPVOID lpReserved)
{
if (ulReason == DLL_PROCESS_ATTACH)
{
g_hInstance = hInst;
}
return TRUE;
}
****/
<testIsapi.h>
#pragma once
// testIsapi.h - Header file for your Internet Information Server
// testIsapi Extension
#ifdef _DEBUG
#define _CRTDBG_MAP_ALLOC
#include <crtdbg.h>
#endif
#include "resource.h"
class CtestIsapiExtension : public CHttpServer
{
public:
CtestIsapiExtension();
~CtestIsapiExtension();
// Overrides
public:
virtual BOOL GetExtensionVersion(HSE_VERSION_INFO* pVer);
virtual BOOL TerminateExtension(DWORD dwFlags);
// TODO: Add handlers for your commands here.
// For example:
void Default(CHttpServerContext* pCtxt);
void emptyTest(CHttpServerContext* pCtxt);
void variableTest(CHttpServerContext* pCtxt, LPTSTR pszVar);
DECLARE_PARSE_MAP()
};
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