C / C++ / MFC

Re: Inserting value in list control through worker thread

27-Aug-08 20:50

VCProgrammer wrote:
but as soon as control reaches there program crashes and give a debug assertion failed error...

We can't start guessing unless you show us the code with causes the crash!

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

VCProgrammer27-Aug-08 20:53

VCProgrammer

27-Aug-08 20:53

CTestDlg *obj = new CTestDlg;
int r = obj->m_List.GetItemCount();
obj->m_List.InsertItem(r,Header);

Re: Inserting value in list control through worker thread

Nibu babu thomas27-Aug-08 21:47

Re: Inserting value in list control through worker thread

27-Aug-08 21:47

VCProgrammer wrote:
CTestDlg *obj = new CTestDlg;

Have you created this dialog by calling it's Create function or DoModal?

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

Dhiraj kumar Saini27-Aug-08 21:54

Re: Inserting value in list control through worker thread

27-Aug-08 21:54

using create function

Roger Stoltz27-Aug-08 20:56

Roger Stoltz

27-Aug-08 20:56

You're trying to update the control from the worker thread, right?

If you are, post a user message to the main thread and update the list control from there.

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

Re: Inserting value in list control through worker thread

Arman S.27-Aug-08 21:20

Arman S.

27-Aug-08 21:20

Your all GUI related stuff should be in the UI thread (supposedely the main thread of the application).
When the worker thread is done with its calculations, it should PostMessage to the parent window of the list ctrl (or some other relevant window in the UI thread) by sending the result of its calculation. The important point here is that the worker thread MUST NOT directly modify a UI element, e.g. a list control (this would cause sync issues with unexpected errors).

Have a look at this article:
http://www.codeproject.com/KB/cpp/SyncMultithreadedMFC.aspx[^]

--
Arman

WaitForSingleObject and SetEvent

laksh220427-Aug-08 20:36

laksh2204

27-Aug-08 20:36

Hi Everyone,
I have some confusion with WaitForSingleObject.
Is it necessary for a thread to be in wait state to handle an event?

for example,
Thread1 {
SetEvent(event);
}

Thread2{
while(true) {
if(WaitForSingleObject(event, INFINITE)){
SetEvent(event); //event raised again, but handler thread 2 is not in wait now
}
}
}

Thanks
laksh

Re: WaitForSingleObject and SetEvent

Roger Stoltz27-Aug-08 20:46

Roger Stoltz

27-Aug-08 20:46

All synchronization objects works the same way regarding this, e.g. locking a mutex, releasing a semaphore or setting an event.
In your case the event will be set until some thread calls any of the wait functions such as ::WaitForSingleObject(). The event may be set up to automatically reset when the thread that waits on the event gets released, or it may be set to be "manual reset" in which case you have to call ::ResetEvent() to set the event in a non-signalled state.

But, you have to call any of the waiting functions in order to find out whether the event is signalled or not.
You may call ::WaitForSingelObject() with a timeout value of zero in which case the function will return with WAIT_TIMEOUT unless the event was set.

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

FTP client application

anandi_codeproject27-Aug-08 20:23

anandi_codeproject

27-Aug-08 20:23

Hi,
I want to do FTP client application in vc 6.0/MFC which should include the following functions,
1.Connect to the ftp server..(here i use local host)
1.List the directories in tree view and Navigation between directories.
2.Enumerating, creating, removing, and renaming directories.
3.Renaming, uploading, downloading, and deleting files.

i don know how to start from the scratch. I use the local host and user as anonymous. can anyone guide me how to connect to the ftp local host/server. I hav confusion between winsocket and wininet.. which one i should use for ftp client application and tell me how to proceed further?

Rathore Amit27-Aug-08 23:09

Rathore Amit

27-Aug-08 23:09

see the link

http://www.codeproject.com/KB/IP/ftpserver.aspx

anandi_codeproject28-Aug-08 1:52

anandi_codeproject

28-Aug-08 1:52

Thanks for the reply..The Link which you hav sent deal with FTP Server.. I need FTP Client Application...

Rathore Amit28-Aug-08 17:24

Rathore Amit

28-Aug-08 17:24

Ok, then this link will help

http://msdn.microsoft.com/en-us/library/hf9x9wb4.aspx

if you still any problem to develop, we can find any already developed source and understand it ?

CListCtrl LVITEM lvItem problem

Mark Salsbery28-Aug-08 6:06

Mark Salsbery

28-Aug-08 6:06

If you use sockets, you need to handle all the FTP Ptotocol[^] stuff yourself.

WinInet is much simpler: WinINet: FTP Sessions[^]

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Dhiraj kumar Saini27-Aug-08 19:31

27-Aug-08 19:31

Hi,

Actually i am getting several url 's from the server and i want to the url in my window application(Using MFC) in a CListCtrl.
But it is giving runtime error in InsertItem() ans SetItemText() function although complied with 0 erroes.
Can anyone tell me what is the problem.

My code is as follows:

void CMainDlg::UpdateFootPrintsForVisitor(int n, CString strResponseFootPrints)
{

if(n>-1)
{
if(strResponseFootPrints.IsEmpty())
return;
CStringArray* ptrstrArray = CParser::Parse(strResponseFootPrints,g_strDelimFLD);

for(int i=0; i<ptrstrarray->GetSize(); i++)
{
LVITEM lvItem;
lvItem.mask = LVIF_TEXT;
lvItem.iItem = i;
lvItem.iSubItem = 0;
lvItem.pszText = _T("Sandra C. Anschwitz");

int nItem=m_lstGetFootPrints.InsertItem(&lvItem);//error line during run
m_lstGetFootPrints.SetItemText(nItem,0,(LPCTSTR)(ptrstrArray->GetAt(i)));
}
}

Thanks in Advance
Dhiraj

Nibu babu thomas27-Aug-08 19:39

27-Aug-08 19:39

Dhiraj kumar Saini wrote:
lvItem.pszText = _T("Sandra C. Anschwitz");

This could be issue (just guessing), try this...

TCHAR szName[] = _T("Sandra C. Anschwitz");
lvItem.pszText = szName;

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

Varghese Paul M27-Aug-08 20:14

Varghese Paul M

27-Aug-08 20:14

Just fill the ivItem with 0 to ensure that all other fields are not holding any garbage values.

for(int i=0; iGetSize(); i++)<br />
{<br />
LVITEM lvItem;<br />
ZeroMemory(&lvItem, sizeof(LVITEM));<br />
lvItem.mask = LVIF_TEXT;<br />
lvItem.iItem = i;<br />
lvItem.iSubItem = 0;<br />
lvItem.pszText = _T("Sandra C. Anschwitz");<br />
<br />
int nItem=m_lstGetFootPrints.InsertItem(&lvItem);//error line during run<br />
m_lstGetFootPrints.SetItemText(nItem,0,(LPCTSTR)(ptrstrArray->GetAt(i)));<br />
}

cheers
Varghese Paul

Dhiraj kumar Saini27-Aug-08 20:40

27-Aug-08 20:40

Hi,

Still its giving error in the InsertItem() and SetItemText() function.

Please Tell me what to do.

Thanks
Dhiraj Kumar Saini

Nibu babu thomas27-Aug-08 20:48

27-Aug-08 20:48

Dhiraj kumar Saini wrote:
Still its giving error in the InsertItem() and SetItemText() function.

Please Tell me what to do.

MSDN on iSubItem...

iSubItem
One-based index of the subitem to which this structure refers, or zero if this structure refers to an item rather than a subitem.

You are giving zero based, that should be the problem if it's a report style list.

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

Dhiraj kumar Saini27-Aug-08 20:52

27-Aug-08 20:52

Hi,

Actually i want ClistControl with only one column to show one data data. It does not contain anyother sub item. So iSubItem is given value zero and not one.

Dont know what to do.
Thanks
Dhiraj Kumar Saini

Varghese Paul M27-Aug-08 22:07

Varghese Paul M

27-Aug-08 22:07

From where you are calling method UpdateFootPrintsForVisitor from your code?
Is the m_lstGetFootPrints object is valid at that time?
Just try ::IsWindow(m_lstGetFootPrints.m_hWnd) to make sure that the control is created and ready to work.

cheers
Varghese Paul

Dhiraj kumar Saini27-Aug-08 22:47