Solved

CInternetSession - invalid handle type

Posted on 2002-07-27
3
767 Views
Last Modified: 2013-11-20
I use CInternetSession to get HTTP files. My application is multi-threaded. The code to get the files is like this:


CHttpConnection* pServer = NULL;
     CHttpFile* pFile = NULL;

    TRY
    {
          if (mysession == NULL) mysession = &defaultsession;
          mysession->SetOption(INTERNET_OPTION_CONNECT_TIMEOUT, 1000 * 20);
          mysession->SetOption(INTERNET_OPTION_CONNECT_BACKOFF, 1000);
          mysession->SetOption(INTERNET_OPTION_CONNECT_RETRIES, 2);

          CString s = url;
          //CStdioFile *remotefile = mysession.OpenURL(s,1,INTERNET_FLAG_TRANSFER_BINARY);
         
          CString strServerName;
          CString strObject;
          INTERNET_PORT nPort;
          DWORD dwServiceType;
          const TCHAR szHeaders[] =_T("Accept: */*\r\n");

          if (!AfxParseURL(s, dwServiceType, strServerName, strObject, nPort))
          {
          }
          //DWORD time = GetTickCount();
          pServer = mysession->GetHttpConnection(strServerName, nPort);
          //TRACE("get connection:%d\n",GetTickCount()-time);
          //time = GetTickCount();
          pFile = pServer->OpenRequest(CHttpConnection::HTTP_VERB_GET, strObject);
          pFile->AddRequestHeaders(szHeaders);
          if (!pFile->SendRequest()) {
               AfxMessageBox("Failed");
               THROW(new CException());
          }
         
          //TRACE("Send request:%d\n",GetTickCount()-time);
          //time = GetTickCount();
     
          DWORD dwRet;
          pFile->QueryInfoStatusCode(dwRet);

Error occurs at QueryInfoStatusCode call. The stack trace is:

CInternetFile::AssertValid() line 1307 + 25 bytes
CHttpFile::AssertValid() line 2281
AfxAssertValidObject(const CObject * 0x009e31c0 {FILE*=0x00000000 name=???}, const char * 0x5f4cdb80 THIS_FILE, int 2225) line 108
CHttpFile::QueryInfoStatusCode(unsigned long & 3435973836) line 2226
GetHttpFile(CString {"http://203.239.186.211:8080/webdemo/kyoto/map01.ipq/a1"}, unsigned char * & 0xcccccccc, int & -858993460, CInternetSession * 0x009e5678 {CInternetSession}) line 468

The code of CInternetFile where error occurs is:

if (IsKindOf(RUNTIME_CLASS(CHttpFile)))
          {
               ASSERT(dwResult == INTERNET_HANDLE_TYPE_HTTP_REQUEST);
          }

Value of dwResult is 4096 (INTERNET_HANDLE_TYPE_HTTP_REQUEST is 13).

I have one default session for generic requests (single threaded), some other sessions (one at a time) to retrieves many files (multi-threaded). The errors occurs on both types of session.
Any idea to get over this?
0
Comment
Question by:daitt
3 Comments
 
LVL 12

Expert Comment

by:migel
ID: 7184658
Hi!
it seems like OpenRequest return wrong pointer
can you check every WinInet Call result?
You can call GetLastError API to get WinInet call reslts.
0
 
LVL 3

Author Comment

by:daitt
ID: 7342927
The problem was that multi threads accessing the same internet session may cause problem. I think Internet session is not thread-safe. I create separated internet session for each thread and it's ok now.
0
 
LVL 5

Accepted Solution

by:
Netminder earned 0 total points
ID: 7471702
Per request, points refunded and question closed.

Netminder
CS Moderator
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction: Dynamic window placements and drawing on a form, simple usage of windows registry as a storage place for information. Continuing from the first article about sudoku.  There we have designed the application and put a lot of user int…
Introduction: Dialogs (1) modal - maintaining the database. Continuing from the ninth article about sudoku.   You might have heard of modal and modeless dialogs.  Here with this Sudoku application will we use one of each type: a modal dialog …
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
I designed this idea while studying technology in the classroom.  This is a semester long project.  Students are asked to take photographs on a specific topic which they find meaningful, it can be a place or situation such as travel or homelessness.…

911 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now