C / C++ / MFC Discussion Boards

rrrado26-Jan-04 21:44

26-Jan-04 21:44

Hello,

can please someone explain me, how modeless dialogs are working ?
Does they have their own message queue ?
Which thread is processing their messages ? (When I have one threaded
application which just created couple od modeless dialogs) ?

rrrado

Re: modeless dialogs - ownmessage queue ?

Diddy27-Jan-04 0:11

Diddy

27-Jan-04 0:11

Message Q's are on a per-thread basis - each modeless dialog your thread creates will be serviced by the same message Q - it's the magic call(s) to IsDialogMessage in the message pump that translates the keyboard messages for each dialog.

Re: modeless dialogs - ownmessage queue ?

rrrado27-Jan-04 0:47

rrrado

27-Jan-04 0:47

Thanks !

rrrado

How to get CurrentDir of an application running in Embedded Visual C?

ntnhan26-Jan-04 21:31

ntnhan

26-Jan-04 21:31

I make an Application running on PocketPC, but I don't know how to get current directory for my App.
Ex: I put my App in \Program files\MyApp\
When I change its location, I can't read my data file in the newfolder!
Ex: I change its location to: \MyApp1\

HonestRing

Re: How to get CurrentDir of an application running in Embedded Visual C?

Michael P Butler27-Jan-04 1:57

Michael P Butler

27-Jan-04 1:57

GetModuleFileName will give you the path and filename, all you'll need to do is strip the filename from the end and replace it with your data file name.

Have a look on MSDN for more info, as the function may not be supported by all devices.

Michael

But you know when the truth is told,
That you can get what you want or you can just get old,
Your're going to kick off before you even get halfway through.
When will you realise... Vienna waits for you? - "The Stranger," Billy Joel

Utility for checking dependencies

rajeev26-Jan-04 21:31

rajeev

26-Jan-04 21:31

I am working on a functionality just opposite to what the Microsoft Depends does. Rather than finding out the dependencies of an exe/dll I need to list down the exe's/dll's dependent upon a particular function in a library.
Is there any such utility available? Or can I get some help on the same?

memory leak debugger

Gérald Mercet26-Jan-04 21:16

Gérald Mercet

26-Jan-04 21:16

Hi everybody,

I would like to know if someone could tell me if a debugger made to find memory leak problem exist for windows environment & if it's ok where i could find it? Some of my friends tell me about a software called "valgrind" which only works under linux environment!

Thanks in advance for yours answers

Gerald

Re: memory leak debugger

J. Eric Vaughan27-Jan-04 3:16

J. Eric Vaughan

27-Jan-04 3:16

If your app uses MFC, you can use the DEBUG_NEW macro, and memory leaks will be outputted to your Output windows in Visual Studio. This even tells you the line of code where the object was "new"ed.

At top of all .cpp files:

#ifdef _DEBUG
  #define new DEBUG_NEW
  #undef THIS_FILE
  static char THIS_FILE[] = __FILE__;
#endif

difference between CSocket and CAsynSocket Recieve Call

Atif Mushtaq26-Jan-04 20:20

Atif Mushtaq

26-Jan-04 20:20

What is the difference between CSocket and CAsyncSocket

Accrding to MSDN CSocket is a blocking socket and CAsynSocket is a non blocking socket from it what i understood that for example if u make a call on CSocket Recieve it will not return untill u get the whole data (which is wrong when data is on average > 5 k u have to make multiple recieve call to fetch the whole data)
but in case of CAsyncSocket u will have to loop to get whole data .

but another joke written in MSDN is that one should not make multiple recieve calls in OnRecieve while using CSocket::Recieve cauz CSocket is internally dooing looping to recieve whole data.
but with single call u cannot get the whole data atonce. so result of it's is that CSocket becomes useless after transferring 40 , 50 k data on average.

so can anybody explain this scneriao . what is the best way to recieve data in OnRecieve and what socket should i use CSocket or CAsyncSocket.

Note:i am writing a Video streaming software so server on average sends me data range from 5 to 15 k /sec .what i do in OnRecieve is asfollows
do//i am using CSocket
{
res=Receive(ptr,lLength);//where ptr is buffer of size of incoming data
if(res==SOCKET_ERROR)
{
Close();
break;
}
ptr+=res;
total+=res;
}

while(total<lLength);//lLength is size of incoming data

in this case according to msdn i am making multiple recieve call which is wrong , but the reason for it is that i am not able to recieve whold data with one Recive call .
but the result of this code is that it works for hardly 10 to 12 frames. and i have to reconnect again.

No Worries!

Re: difference between CSocket and CAsynSocket Recieve Call

RobJones27-Jan-04 3:03

RobJones

27-Jan-04 3:03

I would try to stay away from CSocket and CAsyncSocket (I have ran into lots of problems with both).. If you use standard WinSock and stay away from those wrapper classes it would be much easier.

Here is a example of how I might do the loop..

// This would keep looping until all the data is read, or a error occures.
char buff[4096];
int nRec;
while(nRec = recv(client,buff,sizeof(buff),0))
{
	// Error and its not WSAEWOULDBLOCK
	if((nRec == SOCKET_ERROR) && (nRec != WSAEWOULDBLOCK))
	{
		// Clean up and exit. (We have a problem)
		// You could do WSAGetLastError() to figure out
		// what exactly is happening.
	}
	else // Every thing is fine and dandy, keep looping until done.
	{
		// Store your info in this part		
	}
}

Hope this helps..
Rob

Whoever said nothing's impossible never tried slamming a revolving door!

Re: difference between CSocket and CAsynSocket Recieve Call

Atif Mushtaq27-Jan-04 18:16

Atif Mushtaq

27-Jan-04 18:16

But is it possible to get OnReceive , OnClose like event notifications using WINSOK , can u refer me some good code regarding this.

No Worries!

Re: difference between CSocket and CAsynSocket Recieve Call

RobJones28-Jan-04 3:04

RobJones

28-Jan-04 3:04

Yep you can get all those notifications.. Look around in CodeProject under Internet & Network there are quite a few articles from basic to advanced.. I will dig through my favorites when I get into work and email you some URL's with examples and good reading..

Rob

Whoever said nothing's impossible never tried slamming a revolving door!

Re: difference between CSocket and CAsynSocket Recieve Call

RobJones28-Jan-04 3:59

RobJones

28-Jan-04 3:59

Here is another good WinSock site.. I thought I had more links at work but I don't.. Anyway between Codeproject's Internet & Network area and the following link you shouldn't have many problems converting over to WS..

http://www.sockets.com/

Rob

Whoever said nothing's impossible never tried slamming a revolving door!

Re: difference between CSocket and CAsynSocket Recieve Call

Atif Mushtaq28-Jan-04 5:16

Atif Mushtaq

28-Jan-04 5:16

thanx for ure reply.Some One has told me that BSD sockets are best of all , what u think abt it.cauz i now that CAsyncSocket is also a wrapper on WINSOCK , if that has problem how can i write a better wrapper than that , specially when u have limited time.

No Worries!

Re: difference between CSocket and CAsynSocket Recieve Call

Xiangyang Liu 刘向阳28-Jan-04 7:02

Xiangyang Liu 刘向阳

28-Jan-04 7:02

Strangely enough, I never found any problem with CSocket. [Edit] I was able to send/receive data over 4 mega bytes using CSocket. [/Edit] But I don't have a simple sample program for you.

If you don't mind reusing existing code, maybe you can check out this article[^], which does a lot more than you need.

[Edit] You will have to use it in both of your programs (client and server) [/Edit]

My articles and software tools

Windows hooks

Abhi Lahare26-Jan-04 18:43

Abhi Lahare

26-Jan-04 18:43

Hi all,
Is it possible to determine how many and what types of hooks are installed?.

Thanks in advance,
Abhishek

Edit boxes

calebcohoon26-Jan-04 17:18

calebcohoon

26-Jan-04 17:18

Hello,

I'm currently writing a win32 application and I was wondering how I could make an address bar, like Internet Explorer, for the top of my program? Thanks, Caleb

Re: Edit boxes

P-Rex26-Jan-04 20:59

P-Rex

26-Jan-04 20:59

You can use a ComboBox for the adressbar and insert the adress with m_myCbo.Addstring(). If you want to show the adresses which are inserted before and you run the programm again write it into the registry or in an *.ini-file with WriteProfileString and GetProfileString().

Example:

   <br />
   CString strSection       = "My Section";<br />
   CString strStringItem    = "My String Item";<br />
   CString strIntItem       = "My Int Item";<br />
<br />
   CWinApp* pApp = AfxGetApp();<br />
<br />
   pApp->WriteProfileString(strSection, strStringItem, "test");<br />
<br />
   CString strValue;<br />
   strValue = pApp->GetProfileString(strSection, strStringItem);<br />
   ASSERT(strValue == "test");<br />
<br />
   pApp->WriteProfileInt(strSection, strIntItem, 1234);<br />
   int nValue;<br />
   nValue = pApp->GetProfileInt(strSection, strIntItem, 0);<br />
   ASSERT(nValue == 1234);<br />

The ini-file got the name of your programm and you can find it under C:\Windows\ or C:\Winnt\.

PR

Re: Edit boxes

Robert A. T. Káldy27-Jan-04 0:24

Robert A. T. Káldy

27-Jan-04 0:24

1. Create the address bar like dialog window in Resource editor. Set the style CHILD and border NONE.

2. In CMainFrame class declaration add:

CDialogBar m_wndAddressBar;
CReBar m_wndReBar;

3. In CMainFrame::OnCreate() add:

m_wndAddressBar.Create(this, IDD_ADDRESSBAR, CBRS_ALIGN_TOP, AFX_IDW_DIALOGBAR);
m_wndReBar.Create(this);
m_wndReBar.AddBar(&m_wndAddressBar);

The IDD_ADDRESSBAR is the resource ID of your address bar in Resource editor.

Robert-Antonio

Re: Edit boxes

calebcohoon27-Jan-04 5:40

calebcohoon

27-Jan-04 5:40

Thanks for your replies!

Finding version info of a DLL

haritadala26-Jan-04 17:13

haritadala

26-Jan-04 17:13

Hello all

Is there any function to findout the version information of a DLL programatically. Pls help..

Thanks
Hari.

Re: Finding version info of a DLL

Tim Smith26-Jan-04 17:26

Tim Smith

26-Jan-04 17:26

No (well, not one simple one).

Take a look at this. Should give you enough information to get started.

http://www.codeproject.com/file/VersionInfo.asp?target=version%7Cinfo[^]

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Re: Finding version info of a DLL

Anonymous26-Jan-04 17:29

Anonymous

26-Jan-04 17:29

There sure is. The function is defined in <shlwapi.h> which is part of the Platform SDK.

<code>
HRESULT CALLBACK DllGetVersion(DLLVERSIONINFO *pdvi);
</code>

Hope this helps.

Re: Finding version info of a DLL

haritadala27-Jan-04 3:51

haritadala

27-Jan-04 3:51

Thank you very much for the replies.

Re: Finding version info of a DLL

Tim Smith27-Jan-04 4:18

Tim Smith

27-Jan-04 4:18

This is not an API routine, it is a routine that must be implemented by the DLL.

MSDN:

This function is not an API. It is exported by name from each DLL that implements it. Currently, most of the Windows Shell and common controls DLLs implement DllGetVersion. These include, but are not limited to, Shell32.dll, Comctl32.dll, Shdocvw.dll, and Shlwapi.dll.

It will not work on all DLLs.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

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