making a class thread safe - C / C++ / MFC Discussion Boards

Prakash Nadar10-Apr-04 5:21

10-Apr-04 5:21

Abe sardar kab tere jaise logoko akal ayega?
Actaully, its you who badly needs it, firstly not to put some image where you are supposed to put ur name, and secondly not to post problems related to ur stupidity in visual c++ forum.

Sporder.exe on Win98

Kuniva10-Apr-04 1:09

Kuniva

10-Apr-04 1:09

Hi, i want to run the sporder.exe tool on win98 to view my layered service provider order but the sporder.exe is linked to WS2_32.dll for WriteProviderOrder, and the winsock 2 version for Win98 doesnt seem to have that function exported. But thats why there's sporder.dll i thought, but where do i get the version of Sporder.exe for Windows 98? I know i had it before.. i just don't remember where to find it Frown | :(

Or maybe the source so u can compile it?

Kuniva
--------------------------------------------

Fonts, texts ...

Ni@m10-Apr-04 1:06

Ni@m

10-Apr-04 1:06

I need to output text, where it have some words boiled! All outputted text must be wordwrapped and aligned! Help please!

Re: Fonts, texts ...

toxcct10-Apr-04 1:48

toxcct

10-Apr-04 1:48

i don't exactly understand wat you want to do, and what tools you want to realise that with...

precise your hopes...

TOXCCT >>> GEII power

Re: Fonts, texts ...

niam10-Apr-04 2:16

niam

10-Apr-04 2:16

I need some words int outputted text (DrawTextEx(..)) be bold!

Re: Fonts, texts ...

toxcct10-Apr-04 2:43

toxcct

10-Apr-04 2:43

Could you reply an example of the input and outputs texts, as you want them, please ?!

TOXCCT >>> GEII power

Re: Fonts, texts ...

avenger_sb2510-Apr-04 17:21

avenger_sb25

10-Apr-04 17:21

Send me a BIG THANX in my mailbox and i will write a custom function for you to accomplish ur work.

I will basically use Textout with some formatting that you want (word wrap etc.).
If you can write it on ur own, go ahead... lol

...Avenger

Remember... testing & debugging are always part of programming ...so exterminate those stinking bugs

making a class thread safe

packetlos10-Apr-04 0:51

packetlos

10-Apr-04 0:51

Hi,

I am trying to make my class thread safe with out much luck and wonder if anybody can point me in the right direction. An object of this class is shared between 2 threads, therefore I have added some critical sections but in testing this does not seem to be enough, below is what i have so far:

void CPacket::Lock()
{
  CSingleLock singleLock(&m_CList);
  singleLock.Lock();
  ASSERT(singleLock.IsLocked());
}

void CPacket::Unlock()
{
  CSingleLock singleLock(&m_CList);
  singleLock.Unlock();
  ASSERT(!singleLock.IsLocked());
}

and in my code around all use of the object:

m_capturedPacket->Lock();
m_capturedPacket->Addpacket() // do something
m_capturedPacket->Unlock();

Internally the class mainatins a CList which is being corrupted, how can I make calls to this class thread safe?

Re: making a class thread safe

Gary R. Wheeler10-Apr-04 2:11

Gary R. Wheeler

10-Apr-04 2:11

The CSingleLock class unlocks the object in its destructor. Your Lock() function locks the critical section, and then when the CSingleLock object is destroyed when the Lock() function returns, the critical section is unlocked.

Try changing your code to this:

void CPacket::Lock(){
  m_CList.Lock();
  ASSERT(m_CList.IsLocked());
}
void CPacket::Unlock(){
  m_CList.Unlock();
  ASSERT(!m_CList.IsLocked());
}

Software Zen: delete this;

Systemtray + compiling

Geert van Horrik10-Apr-04 0:35

Geert van Horrik

10-Apr-04 0:35

Hi all,

I use this class for an icon in the systemtray, and I added some extra code for extra features...

http://www.codeproject.com/shell/systemtray.asp?target=tray%7Cicon&df=100&forumid=88&app=50

Now the strange thing is that it gives lots of errors like 'NIIF_INFO' : undeclared identifier
when I debug the application.

But when I build the application, no errors are shown and it really builds & runs the application!

Strange huh??

How can I solve this problem, because I want to build my project in Debug mode too!

I already set _WIN32_IE 0x0500 in stdafx.h

Thanks!

Geert

service problem!!!

tank10259-Apr-04 23:43

tank1025

9-Apr-04 23:43

hi,all:
i'm writing a service,and create a windows in login desktop.i can see the windows in spy trace.but the trace show the window proc is unavailable and the window can not receive msg from remote another service.the service type is SERVICE_INTERACTIVE_PROCESS.who can tell me why?

void CTsapiWnd::DoCreate()
{
CreateEx(0,AfxRegisterWndClass (CS_GLOBALCLASS),"tsapimsg2", 0, 0,0,0, 0,0, 0, 0);
}

in service:

BOOL ShowMsgDlg()
{
hwinstaCurrent = GetProcessWindowStation();
if (hwinstaCurrent == NULL){
LogEvent(_T("get window station err"),0,FALSE);
//return FALSE;
}

hdeskCurrent = GetThreadDesktop(GetCurrentThreadId());
if (hdeskCurrent == NULL){
LogEvent(_T("get window desktop err"),0,FALSE);
//return FALSE;
}

hwinsta = OpenWindowStation("winsta0", FALSE,
WINSTA_ACCESSCLIPBOARD |
WINSTA_ACCESSGLOBALATOMS |
WINSTA_CREATEDESKTOP |
WINSTA_ENUMDESKTOPS |
WINSTA_ENUMERATE |
WINSTA_EXITWINDOWS |
WINSTA_READATTRIBUTES |
WINSTA_READSCREEN |
WINSTA_WRITEATTRIBUTES);
if (hwinsta == NULL)
{
LogEvent(_T("open window station err"),0,FALSE);
//return FALSE;
}

if (!SetProcessWindowStation(hwinsta))
{
LogEvent(_T("Set window station err"),0,FALSE);
//return FALSE;
}

hdesk = OpenDesktop("default", 0, FALSE,
DESKTOP_CREATEMENU |
DESKTOP_CREATEWINDOW |
DESKTOP_ENUMERATE |
DESKTOP_HOOKCONTROL |
DESKTOP_JOURNALPLAYBACK |
DESKTOP_JOURNALRECORD |
DESKTOP_READOBJECTS |
DESKTOP_SWITCHDESKTOP |
DESKTOP_WRITEOBJECTS);
if (hdesk == NULL)
{
LogEvent(_T("Open desktop err"),0,FALSE);
//return FALSE;
}

SetThreadDesktop(hdesk);

m_TsapiWndPtr=new CTsapiWnd;
m_TsapiWndPtr->DoCreate();

if (!SetProcessWindowStation(hwinstaCurrent))
return FALSE;

if (!SetThreadDesktop(hdeskCurrent))
return FALSE;

if (!CloseWindowStation(hwinsta))
return FALSE;

if (!CloseDesktop(hdesk))
return FALSE;

return TRUE;
}

Re: service problem!!!

Mikko Puonti9-Apr-04 23:58

Mikko Puonti

9-Apr-04 23:58

Could it be security issue?

Re: service problem!!!

tank102510-Apr-04 0:05

tank1025

10-Apr-04 0:05

then what should i do?

Maximize dialog based app on startup

pma9-Apr-04 23:15

pma

9-Apr-04 23:15

Hi,

I need a proper way of keeping a window maximized all the time.
On startup its quite easy, I just call:
ShowWindow(SW_SHOWMAXIMIZED);

But the problem is if the user minimizes the window and then
reopens it, then it wont be maximized again.

Thank you for your help
Mario

Re: Maximize dialog based app on startup

Prakash Nadar9-Apr-04 23:35

Prakash Nadar

9-Apr-04 23:35

in the oninitdialog resize the window using setwindowpos(...).

Re: Maximize dialog based app on startup

ThatsAlok9-Apr-04 23:36

ThatsAlok

9-Apr-04 23:36

ok
you can use following code buddy

add window handller WM_SIZE ok

void OnSize( UINT nType, int cx, int cy ){

if(nType==SIZE_MINIMIZED)
{
}else
{
this->ShowWindow(SW_SHOW_MAXIMIZED);

}
}

ok that very simple Smile | :)

Alok Gupta
visit me at http://alok.stormpages.com

Find The type of Internet Connection....

swarnamanoo9-Apr-04 23:10

swarnamanoo

9-Apr-04 23:10

Hi all...
How can i know the type of Internet connection such as ISDN,Direct connection or 56.6kbps modem etc used by a client.

Problem accessing one class from another and vice versa

Iceberg769-Apr-04 20:34

Iceberg76

9-Apr-04 20:34

Hello,

I am writing a application in Visual C++ .NET 7.0. I'd like to keep my classes in seperate files to keep things organized, but I am having difficulty accessing classes from within two files. Can someone help me find a solution accessing between files in this manner? I need to access methods and data back and forth in this manner, but I don't want the two classes to be in the same file. What am I doing wrong? Is there a different way to do this?

Here is a simplified version:

Class1.h

#ifndef __Class1H__
#define __Class1H__

#include "Class2.h"

class Class1
{
public:
Class1();
~Class1();
//This doesn't work because it is in a different file!
Class1(Class2* object);
//This doesn't work because it is in a different file!
Class2 obj;

};
#endif // __Class1H__

Class2.h

#ifndef __Class2H__
#define __Class2H__

//this is causing problems...
#include "Class1.h"

class Class2
{
public:
Class2();
~Class2();

};
#endif // __Class2H__

Class1.cpp

#include "Class1.h"

Class1::Class1()
{

}

Class1::~Class1()
{

}

Class2.cpp

#include "Class2.h"

Class2::Class2()
{

}

Class2::~Class2()
{

}

Re: Problem accessing one class from another and vice versa

toxcct9-Apr-04 21:39

toxcct

9-Apr-04 21:39

first, why do you call #include "Class1.h" into Class2.h when Class2 dont use any object from Classe 1 ??

So, do this :

Class1.h
<font style="color:blue;">#include</font> <font style="color:gray;">"Class2.h"</font>;
 
<font style="color:blue;">class</font> Class1;
<font style="color:blue;">class</font> Class1 {
     Class2 MyClass2Object;
     <font style="color:green;">//...</font>
}
 
Class2.h
<font style="color:blue;">class</font> Class2;
<font style="color:blue;">class</font> Class2 {
     <font style="color:green;">//...</font>
}

there won't have any recursive call problem anymore...

i forgot to say, don't put the data members into public: statement... prefer this for the interface (member functions which are allowed for the users).

TOXCCT >>> GEII power

Re: Problem accessing one class from another and vice versa

toxcct9-Apr-04 21:51

toxcct

9-Apr-04 21:51

oh, i see another problem...

each header file must be "included" once into the project. for that, you must use preprocessor directive to exclude recursive redifinitions :

Class1.h
<font style="color:blue;">#if</font> !<font style="color:blue;">defined</font>(__CLASS1_H_INCLUDED__)
<font style="color:blue;">#define</font>      __CLASS1_H_INCLUDED__
 
<font style="color:green;">//...</font>
 
<font style="color:blue;">#endif</font><font style="color:green;">//__CLASS1_H_INCLUDED__</font>
 
 
Class2.h
<font style="color:blue;">#if</font> !<font style="color:blue;">defined</font>(__CLASS2_H_INCLUDED__)
<font style="color:blue;">#define</font>      __CLASS2_H_INCLUDED__
 
<font style="color:green;">//...</font>
 
<font style="color:blue;">#endif</font><font style="color:green;">//__CLASS2_H_INCLUDED__</font>

that concern only .h files. don't forget !

TOXCCT >>> GEII power

Clipboard copy

Member 60749-Apr-04 20:32

Member 6074

9-Apr-04 20:32

sir,

I need a code to get a selected text from any window to the clipboard and I would like to know how windows implements cltr+c for copying a selected text from any window.

Re: Clipboard copy

ThatsAlok9-Apr-04 23:43

ThatsAlok

9-Apr-04 23:43

//copy
CString str="alok"
if (::OpenClipboard(AfxGetApp()->m_pMainWnd->GetSafeHwnd())) {
if(::EmptyClipboard()) {
if (::SetClipboardData(CF_TEXT,str) == NULL ) {
AfxMessageBox( "Unable to set Clipboard data" );
} } }
CloseClipboard();

//paste
CString str;
if (OpenClipboard()) str=GetClipboardData(CF_TEXT);
CloseClipboard();

that willl help you lot Rose | [Rose]

Alok Gupta
visit me at http://alok.stormpages.com

Formating output file

picasso29-Apr-04 19:28

picasso2

9-Apr-04 19:28

Have a txt file that looks like this
2345
5332
4433
4343
5555
6666
....

Want to read and write it to another text file like this (3 columns)

2345 5332 4433
4343 5555 6666
using c++ (non MFC)

any help will be greatly appreciated

Re: Formating output file

Prakash Nadar9-Apr-04 19:51

Prakash Nadar

9-Apr-04 19:51

openinfile();
openoutfile();

int i = 0;
while(!endoffile)
{
  readfrominfile;
  writetooutfile;
  i++;
  if(i==3)
  {
      write '\n' to out file;
      i = 0;
  }
}

MSN Messenger.
prakashnadar@msn.com

"If history isn't good, just burn it." - Sidhuism.

Active Window?

David Horner9-Apr-04 18:54

David Horner

9-Apr-04 18:54

Hi,
I'm interested in writing a program that must keep track of the current active window.
I would like to get messages from the OS that tells me when the user switches from app to app.
What is the best way to do this?

Should I use a WM_TIMER and just check what process the current active window belongs to?
(actually, I don't know exactly what function I should use to find the current active window and process)
Or is there a way to hook into something that would notify me on changes?

Samples, comments would be wonderful!

Thanks,
Dave

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