Strange MFC socket problems - C / C++ / MFC Discussion Boards

Daniel Turini8-Oct-02 7:58

8-Oct-02 7:58

Problems that go by themselves come back with friends...

"In an organization, each person rises to the level of his own incompetence." Peter's Principle

Re: permission denied ---

ns8-Oct-02 8:03

8-Oct-02 8:03

dreading it...

Appreciate your help,
ns

Macro programming reference

fury948-Oct-02 6:17

fury94

8-Oct-02 6:17

Hi,

I looked at the code of some VC++ macros (DSM files). It's pretty simple, but is there a documentation about the various objects (example : ActiveProject) and methods you can use, that are specific to Visual C++ ?

Or do you need Visual Basic to help you with members listing and auto-completion ?

Thanks,
Thibaut

CComboBox question.

ns8-Oct-02 5:24

8-Oct-02 5:24

I've never used one before. I need a link to a simple example that shows how to use it. I need to start with no items in the dropdown, but as the user enters them in the edit portion, they should get added to the dropdown part> then if you so choose, you should be able to click on an entry which should then show up in the editbox part. I need to see how to get this simple functionality. Code on CP seems very advanced, and I'm wondering if theres a simple example of using a combobox

Appreciate your help,
ns

Re: CComboBox question.

Stephane Rodriguez.8-Oct-02 5:45

Stephane Rodriguez.

8-Oct-02 5:45

Buy this book "Programming Windows with MFC[^]" Jeff Prosise.

That's what you need if you are willing to learn well, add skills, and accelerate.

She's so dirty, she threw a boomerang and it wouldn't even come back.

Re: CComboBox question.

Max Santos8-Oct-02 5:52

Max Santos

8-Oct-02 5:52

You can try this...

CString s;
m_Combo.GetWindowText(s);
m_Combo.InsertString(0,s);
m_Combo.SetWindowText("");
m_Combo.SetFocus();

You can put something like this on a button (Add) or you can overide the OnKeyPress or Pretranlatemessage to do it whem you press the ENTER

Casa.Sapo.pt

Thank you!

ns8-Oct-02 6:18

8-Oct-02 6:18

That helps me on my way! Thanks a bunch! Smile | :)

Appreciate your help,
ns

Strange MFC socket problems

User 66588-Oct-02 4:58

User 6658

8-Oct-02 4:58

Hi,

I'm sending queries to many game servers via UDP in a for-loop. But in the receive function there seems to be a problem:

void CMainFrame::OnReceiveUDP()
{
        SOCKADDR_IN fromAddr;
        int fromSize = sizeof(fromAddr);
	
	TCHAR pkt[PACKETLEN];
	
        int respStringLen = m_sSocket.ReceiveFrom(pkt, PACKETLEN-1, (SOCKADDR*)&fromAddr, &fromSize, 0);
        if(respStringLen == SOCKET_ERROR)
        {
                CString	string;
                string.Format("CUDPSocket::ReceiveFrom() failed\nReason: %i", GetLastError());
                MessageBox(string, "Error", MB_OK|MB_ICONSTOP);
                return;		
        }
        else
        {
                CListView* pView = (CListView*)GetActiveView();
                CListCtrl &list = pView->GetListCtrl();

                list.InsertItem(idx, pkt);
                idx++;
        }
}

But after about 30 servers I only have garbage characters in the variable pkt, although the servers send normal packets. How can this happen?

thanks in advance
Greg

modified 12-Sep-18 21:01pm.

Re: Strange MFC socket problems

jparsons8-Oct-02 6:40

jparsons

8-Oct-02 6:40

Can you post the code for hte for loop?

Jared
jparsons@jparsons.org
www.prism.gatech.edu/~gte477n

Re: Strange MFC socket problems

User 66588-Oct-02 7:38

User 6658

8-Oct-02 7:38

for(int i=0; i<servercount; i++)
			{
				CServer server = arServers.GetAt(i);
				if (m_sSocket.SendTo("\\status\\", 8, server.QueryPort, server.IP, 0) != 8) 
				{
					//MessageBox("CUDPSocket::SendTo() failed", "Error", MB_OK|MB_ICONSTOP);
				}
			}

arServers is an CArray of servers
I know this code is crappy, but I don't know how to make it better. Frown | :(

reagrds

modified 12-Sep-18 21:01pm.

Win32 API : Which #include do I need ?

Jerome Conus8-Oct-02 4:36

Jerome Conus

8-Oct-02 4:36

Hi !!

I started with VC6 a simple console application. The project is emtpy, I just have an empty main() and and include of stdafx.h.

Now, I'd like to use some functions of the Win32 API (ShellExecuteEx for instance), but I have no idea which headers I have to include. I checked in the msdn but didn't find anything.
When I try to compile, even basic windows types like DWORD are not declared.

Does anyone could tell me where, for each Win32 functions, I can find exactly which lib and which header file I have to add to my project ?

Thanks !
Jerome

Re: Win32 API : Which #include do I need ?

Steve S8-Oct-02 4:51

Steve S

8-Oct-02 4:51

If you have VC++6 or a recent-ish Platform SDK, there is a WIN32API.CSV file which tells you exactly this in the LIB directory.

Normally, you would start with <windows.h>, optionally defining stuff like WIN32_LEAN_AND_MEAN to remove stuff. There are lots of other defines you can do to suppress the inclusion/definition of various Win32 subsystems.

Steve S
[This signature space available for rent]

Re: Win32 API : Which #include do I need ?

Stephane Rodriguez.8-Oct-02 4:55

Stephane Rodriguez.

8-Oct-02 4:55

Launch VC6, and use the Win32 application classwizard to create a project with all the things that you need. It includes windows.h in stdafx.h

She's so dirty, she threw a boomerang and it wouldn't even come back.

Re: Win32 API : Which #include do I need ?

Max Santos8-Oct-02 5:57

Max Santos

8-Oct-02 5:57

If you look at the MSDN and find the ShellExecuteEx function you will have this on the botom of the page (this is a very usefull piece of information)

Function Information

Stock Implementation shell32.dll version 4.00 or later
Custom Implementation No
Header shellapi.h
Import library shell32.lib
Minimum operating systems Windows NT 4.0, Windows 95

Casa.Sapo.pt

Re: Win32 API : Which #include do I need ?

Jerome Conus8-Oct-02 19:15

Jerome Conus

8-Oct-02 19:15

Thank you for your informations !

This is something I never understood with my MSDN. For plenty of function, I get the useful informations you mentionned in your post, but for the ShellExecuteEx, and for some others, I don't get the usual layout of functions description. What I get is a page called 'Internet Tools & Technologies', without these useful informations I was looking for !

Anyway, thanks again for your help !
Jerome

GetWindowText

ns8-Oct-02 4:05

8-Oct-02 4:05

I have a CString which I pass into:

m_editExerciseName.GetWindowText(m_ExerciseName);

However MSDN says

void GetWindowText( CString& rString ) const;

Its & rString the & that is bothering me> How should I change my GetWindowText statement so that a & goes in?
I declared m_ExerciseName as a plain old CString.

Appreciate your help,
ns

Re: GetWindowText

Joaquín M López Muñoz8-Oct-02 4:11

Joaquín M López Muñoz

8-Oct-02 4:11

Your code as it shows should compile and run OK. Do a search for "references" on any C++ tutorial to know more about the & character.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

thanks

ns8-Oct-02 4:45

8-Oct-02 4:45

Good to know. I guess I am off to look into & now. Smile | :)

Appreciate your help,
ns

Re: GetWindowText

Ranjan Banerji8-Oct-02 4:17

Ranjan Banerji

8-Oct-02 4:17

void GetWindowText( CString& rString ) const; implies that the function it self will not change any data that belongs to the CWindow class. Your code will work fine.

Combo Box: I want to catch user changes once he/she is finished

Le centriste8-Oct-02 3:54

Le centriste

8-Oct-02 3:54

I would like to catch user changes on a combo, but only once he is finished typing. How could I do that?

NOTE: CBN_EDITCHANGE don't work. In fact, it is called every time the user types something in the edit, and CBN_SELCHANGED is only called when the user selects an item in the list.

Michel

It is a lovely language, but it takes a very long time to say anything in it, because we do not say anything in it, unless it is worth taking a very long time to say, and to listen to.

- TreeBeard

Re: Combo Box: I want to catch user changes once he/she is finished

Chris Hambleton8-Oct-02 4:18

Chris Hambleton

8-Oct-02 4:18

Try catching the killfocus event of the combobox -- when the cursor leaves the control, you can assume they're done with it.

"If at any time I announce that a nation or kingdom is to be uprooted, torn down and destroyed, and if that nation I warned repents of its evil, then I will relent and not inflict on it the disaster I had planned. And if at another time I announce that a nation or kingdom is to be built up and planted, and if it does evil in my sight and does not obey me, then I will reconsider the good I had intended to do for it." -- Jeremiah 18:7-10 (God, commenting on the value of the United Nations)

Re: Combo Box: I want to catch user changes once he/she is finished

valikac8-Oct-02 10:01

valikac

8-Oct-02 10:01

Consider CBN_DROPDOWN event handler.

Kuphryn

enter should tab

ns8-Oct-02 3:53

8-Oct-02 3:53

My CDialog has two editboxes. I want the Enter key to tab from one box to the other. How would I do this?

Appreciate your help,
ns

Re: enter should tab

Chris Hambleton8-Oct-02 4:31

Chris Hambleton

8-Oct-02 4:31

Override the BOOL CMyXxx::PreTranslateMessage(MSG* pMsg) handler and then try something like:

if (pMsg->message == WM_KEYDOWN && pMsg->wParam == VK_RETURN)
{
if(pMsg->hWnd == m_edit1.GetSafeHwnd())
m_edit2.SetFocus();
else if(pMsg->hWnd == m_edit2.GetSafeHwnd())
m_edit1.SetFocus();

return CXxxx::PreTranslateMessage(pMsg);
}

"If at any time I announce that a nation or kingdom is to be uprooted, torn down and destroyed, and if that nation I warned repents of its evil, then I will relent and not inflict on it the disaster I had planned. And if at another time I announce that a nation or kingdom is to be built up and planted, and if it does evil in my sight and does not obey me, then I will reconsider the good I had intended to do for it." -- Jeremiah 18:7-10 (God, commenting on the value of the United Nations)

Thank you!

ns8-Oct-02 4:44

8-Oct-02 4:44

So thats how its done! MAny thanks.

Appreciate your help,
ns

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