C / C++ / MFC Discussion Boards

Re: Linker errors

Le centriste20-Sep-02 17:52

Le centriste

20-Sep-02 17:52

In the file that every other file includes, I assume you have something like:

var_type iSomeGlobVar;

Replace it with:

extern var_type iSomeGlobVar;

then, in some .cpp file (the one that goes with the .h one, if possible):

var_type iSomeGlobVar;

That should fix it.

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: Linker errors

monrobot1321-Sep-02 2:21

monrobot13

21-Sep-02 2:21

Thanks Michel, just one quick question, will this same procedure work for functions and structs?

Monrobot13

Re: Linker errors

Le centriste22-Sep-02 9:28

Le centriste

22-Sep-02 9:28

A struct can be defined in a .h that is included multiple times with no problem. But if you have a variablee of some struct type, use the export keyword. Same with functions.

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

lparam question?

imran_rafique20-Sep-02 14:48

imran_rafique

20-Sep-02 14:48

Can any body tell how to get the mouse position from the LPARAM.

lParam has WM_LBUTTONUP message.

LPARAM lParam;
LPEVENTMSG lpEvent= (LPEVENTMSG)lParam;
//lpEvent->paramH;
//lpEvent->paramL;
i think i can get mouse position using lpEvent pointer but i could not successed yet
can any body tell how to get it.

r00d0034@yahoo.com

Re: lparam question?

Paul M Watt20-Sep-02 17:55

Paul M Watt

20-Sep-02 17:55

<br />
xPos = GET_X_LPARAM(lParam); <br />
yPos = GET_Y_LPARAM(lParam); <br />

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

In search of a better tree control.

Tony Fontenot20-Sep-02 12:04

Tony Fontenot

20-Sep-02 12:04

Hello all. I have searched through all the Tree Controls on code project and I have yet to find what I need. It could be that I am not looking hard enough, or that I am just blind Suspicious | :suss:

, but your help would be appreciated.

Anyway, I am looking for a tree control that uses check boxes and is smart enough to check all the parent nodes (in that greyed check sort of way) when a child node is checked. I have seen it in just about every application, and I have yet to find anything here.

Thanks in advance. Big Grin | :-D

***********************
Tony Fontenot
Recreational Solutions
tony@recsolutions.com
***********************

Problem in making multithreading Winsock Server

nachilau20-Sep-02 11:24

nachilau

20-Sep-02 11:24

Hello,

I am changing my server to support multithreading. However, I have problem. This is how the server main loop is

<br />
//######################################################################<br />
 // Main Server loop<br />
<br />
 CSocket clientS;<br />
<br />
 while (run)<br />
 {<br />
  Print_Log("A loop... : mainServer->Start()");<br />
  cs.Accept(clientS);<br />
  hSThread = CreateThread(NULL, 0, ServiceThread, &clientS, 0, &threadId);<br />
 } // end while...loop<br />
<br />
 //######################################################################<br />
<br />

Here is my thread call back function:

<br />
DWORD WINAPI ServiceThread(LPVOID p)<br />
{<br />
 CSocket* clientS = ((CSocket*)p);<br />
 int re;<br />
 char r[6];<br />
<br />
 do<br />
 {<br />
  re = clientS->Receive(r, 6);<br />
  if (re != 0)<br />
    cout << r << endl;<br />
 } while (re != 0);<br />
 clientS->Close();<br />
 return 0;<br />
} // end of function ServiceThread()<br />
<br />

I get a error message when the client send me somehing, which is "Debug Assertion Fail". The server can actually receive the message, but when the thread is going to close. The error message come out. I didn't know where my code have make the mistake. Can anyone help me? Thanks!

Nachi Dead | X|

tab control problem

Brad Jennings20-Sep-02 11:25

Brad Jennings

20-Sep-02 11:25

I have a tab control in a single document VC++ document. I have individual dialogs for each tab in the control and the main dialog (CNewStats) also has a Load Stats button. Is there any way to update the data in the dialogs that are inside the tab control after the Load Stats function has been executed? Any help is appreciated.

Brad Jennings

Re: tab control problem

Brad Jennings20-Sep-02 11:41

Brad Jennings

20-Sep-02 11:41

Nevermind all. I figured it out. Thanks, though, if you took a look at it. Later.

Brad Jennings

COleClientItem

Gary Kirkham20-Sep-02 10:37

Gary Kirkham

20-Sep-02 10:37

I am developing an app that will, amongst other things, act as an OLE client. My app will currently embed and display an object, such as a Word document, but I want to go one step farther. When the Word object is displayed it only shows the first page... I want to give the user the ability to scroll through all of the pages (without actually editing the object). I tried deriving my view class from CScrollView, but this only gives the ability to scroll the first page of the Word doc up and down...It doesn't show the rest of the pages.

Does anyone know how to scroll the embedded client object (code examples would help alot)?

Gary Kirkham

A working Program is one that has only unobserved bugs

SendMessage not sending?

ns20-Sep-02 10:21

20-Sep-02 10:21

I have in the VC client a progressbar on the UI.:

BSTR bstrDesc;
// TODO: Add your control notification handler code here
      try
  {
  CoInitialize(NULL);
  _Class1Ptr ptr;
  ptr.CreateInstance(__uuidof(Class1));
  m_Progress1.SetStep(1);

  m_Progress1.SetRange(0, 10);

    long lHwnd=(long)m_Progress1.GetSafeHwnd();

    ptr->CheckingStuff(&lHwnd);

  }

and the VB dll function is:

For i = 1 To 10

result = SendMessage(PbarHandle, PBM_STEPIT, 0, 0)

Next

PBM_STEPIT = 1029

The progressbar in the VC UI remains stubbornly blank. What am I missing? Some manual setting for the progressbar, or some programmatic setting? How can I check if SendMessage is working?

Thanks,
ns

Re: SendMessage not sending?

Joaquín M López Muñoz20-Sep-02 10:24

Joaquín M López Muñoz

20-Sep-02 10:24

Things to check:

Make sure the whole HWND-passing mechanism is OK by having the VB function output the value of the handle passed and verifying that it is the same as the one you have in your MFC app.
Try posting messages instead of sending them.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: SendMessage not sending?

ns20-Sep-02 10:36

20-Sep-02 10:36

Did Postmessage. Handle passe din is correctly received. Catching a com error in try catch. 0x0014509c - thats whats in the e.description.

Also:

First-chance exception in msway.exe (KERNEL32.DLL): 0xC000008F: Float Inexact Result.
First-chance exception in msway.exe (KERNEL32.DLL): 0xE06D7363: Microsoft C++ Exception.

Does this mean anything?

}
catch(_com_error &e)
{
 bstrDesc = e.Description();

}

Thanks,
ns

Re: SendMessage not sending?

ns20-Sep-02 10:45

20-Sep-02 10:45

Interesting ly the msgbox doesnt fire:

result = PostMessage(PbarHandle, PBM_STEPIT, 0, 0)
MsgBox result

Thanks,
ns

GetSafeHwnd()

ns20-Sep-02 10:10

20-Sep-02 10:10

The VC client calls the VB dll:

{
CoInitialize(NULL);
_Class1Ptr ptr;
ptr.CreateInstance(__uuidof(Class1));
m_Progress1.SetStep(1);

m_Progress1.SetRange(0, 10);

ptr->CheckingStuff(m_Progress1.GetSafeHwnd());


}

in VB there is:

Public Function CheckingStuff(PbarHandle As Long)

The VC compiler grumbles:

error C2664: 'CheckingStuff' : cannot convert parameter 1 from 'struct HWND__ *' to 'long *'

I was told that long in VB should be the type, but apparently not.

I even tried:m_Progress1.GetSafeHwnd()->m_hWnd; and m_Progress1.m_hWnd as the calling function argumnents but thats not right either....

Please help!

Thanks,
ns

Re: PArameter Type problem

Joaquín M López Muñoz20-Sep-02 10:12

Joaquín M López Muñoz

20-Sep-02 10:12

This most likely has to do with the annoying STRICT macro. You can ignore it and simply force the expected type:

long lHwnd=(long)m_Progress1.GetSafeHwnd();
ptr->CheckingStuff(&lHwnd);

Good luck.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: PArameter Type problem

ns20-Sep-02 10:17

20-Sep-02 10:17

Thanks, compiles now.

Thanks,
ns

Visual C++.NET Problem

valikac20-Sep-02 9:01

valikac

20-Sep-02 9:01

Hi.

I experience a weird Visual Studio .NET problem and possible bug. I have been using this Visual C++ .NET compiler for a while now, but this problem has never occured. For some reason, Visual C++ wants to rebuild all modules (cpp) whenever I want to run the problem in either debug or release mode. For example, after you run build the problem and run it, you can run it without rebuilding everything if no changes were made. However, now Visual C++ .NET tells me that the programs is out of date everytime I run the program in either debug or release mode. This is true even if I have no changes whatsoever.

Does anyone know a possible reason for this problem?

Thanks,
Kuphryn

Re: Visual C++.NET Problem

Joaquín M López Muñoz20-Sep-02 9:48

Joaquín M López Muñoz

20-Sep-02 9:48

Check the date of all your files inside the project. If some, for some strange reason, is assigned a date in the future this kind of behavior can result.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Visual C++.NET Problem

valikac20-Sep-02 9:50

valikac

20-Sep-02 9:50

Okay. You're right. For some reason the clock on my system is off by eight months!

I reset the date and clock. Everything works now.

Kuphryn

Re: Visual C++.NET Problem

Mike Nordell20-Sep-02 10:10

Mike Nordell

20-Sep-02 10:10

Does anyone know a possible reason for this problem?

Have a search through (watch the wrapping):
http://groups.google.com/groups?group=microsoft.public.dotnet.languages.vc

Let's just say that VC7 is buggy. VC7.1 (a version that you will have to pay even more money for) might have fixed this.

Voice chat

fahadmunir3320-Sep-02 8:28

fahadmunir33

20-Sep-02 8:28

I want to make voice chat application in VC++. For this purpose i am looking for some example source code or good resource from where i can learn and develop my own system. If you know any such code/resource then please do tell me. I've found one code here at CP but it is only peer to peer and can only work on LAN. I want to make my application client-server based just like what in Yahoo messenger. I am expert in socket programming as far as sending text is concerned. But i have no idea how to send voice on internet just like Yahoo messenger. I found nothing at MSDN related to this topic; you know how difficult it is sometimes to search MSDN. If you know any such source on MSDN or anywhere else then please tell me. Your advices in this regard are also welcome.

Re: Voice chat

Mike Nordell21-Sep-02 11:08

Mike Nordell

21-Sep-02 11:08

Nautilus
OpenH323

Google is your friend.

Question about using CSocket writing a server

nachilau20-Sep-02 8:23

nachilau

20-Sep-02 8:23

Hello,

I wonder what is the usage of using Bind method after creating a CSocket in the server. I get an error message when I Bind the socket, however, if I ignore the error, I can still receive the message come from the client. So, what is the usage of using Bind method in server side?

Actually, my code is something like this,

rt = cs.Create(1000, SOCK_STREAM, "127.0.0.1");
if (rt == 0)
Print_Error();
rt = cs.Bind(1000, "127.0.0.1");
if (rt == 0)
Print_Error();

When the program is going to bind the socket, it return error message 10022, which the documentation told me that is "invalid argument" exception. Can someone told me what is my problem?

Thanks!

Nachi Frown | :(

Re: Question about using CSocket writing a server

Joaquín M López Muñoz20-Sep-02 10:07

Joaquín M López Muñoz

20-Sep-02 10:07

You are already binding the socket in the constructor, so the extra call to Bind is superfluous. I guess you are misinterpreting the error code (this should be retrieved with WSAGetLastError and looked upon in the Winsock error table provided by the documentation.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.