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I have written a program which will accept only 20 connections to the server port. If connection goes beyond 20 then below mentioned code will be executed which is in while loop
memset(cSendBuf,' ',23);
memset(&sd, '\0', 23);
printf("\nRejecting Excess Client %s ...\n",inet_ntoa(sockAddr.sin_addr));
strcpy(sd.cstrmsg,"Rejecting Excess Client");
strcpy(cSendBuf,"");
printf("sd.cstrmsg is ;%s\n",sd.cstrmsg);
memcpy(cSendBuf,sd.cstrmsg,23);
int x=send(sock_id,cSendBuf,23,MSG_NOSIGNAL);
printf("x is %d\n",x);
close(sock_id);
continue;
Problem is socket closes before data is sent to client, so client fails to receive data (even though close is after send). Is there is any way to wait till client receives data and then close the socket or other solution like that. If i put sleep(2); before close then it works fine. Using sleep is not a right way to wait.
Waiting for the reply.
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You should create the socket in blocking mode.
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below is code to create, bind, listen socket.
please tell me where i have to change the code (i am new to socketing).
sockAddr.sin_family=AF_INET;
sockAddr.sin_addr.s_addr=INADDR_ANY;
sockAddr.sin_port=htons(iPortNo);
addrLen=sizeof(struct sockaddr_in);
if((serverSocket=socket(AF_INET,SOCK_STREAM,0))== -1)
{
printf("Failed to create Socket\n");
return -1;
}
else
printf("Socket created successfully\n");
rc = setsockopt(serverSocket, SOL_SOCKET, SO_REUSEADDR,(char *)&optval, sizeof(optval));
if(bind(serverSocket,(struct sockaddr_in*)&sockAddr,sizeof(sockAddr))==-1)
{
printf("Failed to bind at port %d\n",iPortNo);
return -1;
}
else
printf("Binding at port %d done successfully\n",iPortNo);
if(listen(serverSocket,1000) == -1)
{
printf("Failed to listen at port %d\n",iPortNo);
return -1;
}
else
printf("Listening at port %d\n",iPortNo);
while(1)
{
pthread_mutex_init(&tCounter.mutex,NULL);
sock_id = accept(serverSocket,(struct sockaddr_in*)&sockAddr,&addrLen);
..........................
..........................
}
Waiting for the reply
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Yes it is a blocking socket. I noticed two potential problem:
1) you use close instead of closesocket.
2) You should set the option SO_LINGER to non-zero, so closesocket will wait for the transmit queue to be empty.
Sorry for the delay in the answer, I am very busy lately.
Regards
Paolo
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Hi,
How to insert property sheet into a form view.I am using Embedded VC++. Can u give me some sugg?
Thanks
JP
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I dont know about eVC++, but i would do it this way. Put a static frame on the formview dialog, then in the initialization fot the formview i will create the propertysheet, add the pages to it, get the rectangle are of the static rectangle and move the propertysheet to that rect. Thats it,
also note that the parent of the propertysheet should be the formview window handle.
Hope i solved ur problem in some way.
"When death smiles at you, only thing you can do is smile back at it" - Russel Crowe (Gladiator)
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Hi,
I have a dialog based application in which i have created a toolbar . now i want to display tooltips for each of the items in the toolbar.
I have tried the following :
CToolTipCtrl Tips;
Tips.Create(this);
Tips.AddTool(GetDlgItem(ID_TEST),"Click to start transferring e-mails");
Tips.Activate(TRUE);
In PretranslateMessage:
Tips.RelayEvent(pMsg);
i have also tried:
CWnd *pwnd=AfxGetApp()->m_pMainWnd->GetDlgItem(IDR_TOOLBAR);
Tips.Create(this);
Tips.AddTool(pwnd->GetDlgItem(ID_TEST),"Click to start transferring e-mails");
Tips.Activate(TRUE);
but to no success .... can you please help me...
Thanking you
Regards
Satadru Karjee.
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Hi everybody,
Here is a brain teaser for all. I have a class hierarchy as below.
The code compiles with a warning (C4355). During run time i get a run time error
R6025 - Pure virtual function call.
#include <iostream.h>
class CBase
{
public:
CBase()
{
}
~CBase()
{
}
virtual void Display() = 0;
};
class CTemp
{
public:
CTemp()
{
}
CTemp(CBase &pBase)
{
// Call the Overrriden function here.
pBase.Display();
}
~CTemp()
{
}
};
class CDerived : public CBase
{
public:
CDerived()
: tempObj(*this)
{
}
~CDerived()
{
}
CTemp tempObj;
virtual void Display()
{
}
};
void main()
{
CDerived obj;
}
The error here is because the base class pointer is calling a Pure virtual function,
which does not have any implementation.
How should i make the code work, without making much code change ?
Or are there any compiler options, which will circumvent the problem ?
Iam using Visual Studio 6.0 as the IDE for compilation.
Any help will be greatly appreciated.
Thanks in advance,
Saleem.
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Try this:
CTemp(CBase *pBase)
{
pBase->Display();
}
John
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here is the working solution
class CBase<br />
{<br />
public:<br />
<br />
CBase()<br />
{ <br />
}<br />
<br />
~CBase()<br />
{<br />
}<br />
<br />
virtual void Display() = 0;<br />
};<br />
<br />
<br />
class CTemp<br />
{<br />
public:<br />
<br />
CTemp()<br />
{<br />
}<br />
<br />
CTemp(CBase *pBase)<br />
{<br />
pBase->Display();<br />
} <br />
~CTemp()<br />
{<br />
}<br />
<br />
};<br />
<br />
class CDerived : public CBase<br />
{<br />
public:<br />
<br />
CDerived()<br />
{<br />
tempObj = new CTemp(this);<br />
} <br />
~CDerived()<br />
{<br />
}<br />
<br />
CTemp* tempObj;<br />
<br />
virtual void Display()<br />
{<br />
printf("hello World i am virtual");<br />
}<br />
<br />
};<br />
<br />
<br />
void main()<br />
{<br />
CDerived obj;<br />
}
changes are in bold.
"When death smiles at you, only thing you can do is smile back at it" - Russel Crowe (Gladiator)
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The real solution is NOT to call a virtual function from the constructor. ISTR that in the C++ specification, it explicitly mentions this; the object construction is not yet complete, so there is no guarantee what (if anything) is in the vtable. More than likely it is the address of the function for the class you're deriving from. If that happens to be a pure virtual function, you're sunk.
Steve S
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Steve S wrote:
the object construction is not yet complete, so there is no guarantee
When the constructor is executing the class initialization is over
"When death smiles at you, only thing you can do is smile back at it" - Russel Crowe (Gladiator)
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But not for any inheriting classes, as the compiler has to construct the base classes first. If you call a virtual function in a base class constructor, the inherited class constructor has yet to complete, so it does not have a valid vtable pointer to the inherited class functions.
MS put this very problem into the CDocTemplate class, where they call a virtual function in the base class constructor. 
Roger Allen - Sonork 100.10016
Roger Wright: Remember to buckle up, please, and encourage your friends to do the same. It's not just about saving your life, but saving the quality of life for those you may leave behind...
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Roger Allen wrote:
as the compiler has to construct the base classes first
yeah true, so when the consturctor body is executing the base class initialation is over.
So again i didnt find the code problematic.
eg:
class CDerived: public CBase
{
public:
CDerived() : m_somethingofbaseclass(56) //Wrong
{
};
CDerived()
{
m_somethingofbaseclass = 0; //Perfectly Rite.
pBase->SomeMethod(); //Correct;
}
.
.
.
}
You see constructor is used for initialaztion of the class, wheather the derived class or the base class. So When the body of the constructor is executing, the lower leve or the invisible level like vtables initialazation is over.
"When death smiles at you, only thing you can do is smile back at it" - Russel Crowe (Gladiator)
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I have been searching and searching and haven't been able to find a good resource on how to work with images on dialog application I am building.
I figured out how to set the background image and stretch it - but as soon as I set the dialog to full screen I can't seem to figure out how to get my Dialog Content Centered - it just hangs out in the top left corner.
The other issue that I am having is trying to set an image as a frame with buttons on top of it - all the images, buttons and other dialog items end up behind the image - if I float over the image then I the buttons pop to the front.
Any pointers to an existing article, thread or even some hints as to how I can make this work would be muchly appreciated.
Dan Morris
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use blitting codes in dialog's OnEraseBkgnd(...) routine
.....
CBitmap m_BackGroundBitmap;//... global variable
.....
m_BackGroundBitmap.LoadBitmap(IDB_AppMainSkin_Ion);
.....
BOOL xxx::OnEraseBkgnd(CDC* pDC)
{
if(!m_BackGroundBitmap.m_hObject) return TRUE;
CDC dc;
dc.CreateCompatibleDC(pDC);
CBitmap* pOldBitmap = dc.SelectObject(&m_BackGroundBitmap);
pDC->BitBlt(0, 0, GetSystemMetrics(SM_CXSCREEN),GetSystemMetrics(SM_CYSCREEN), &dc,0, 0, SRCCOPY);
dc.SelectObject(pOldBitmap);
return TRUE;
}
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HI , i want a tooltip which has the constant behaviour instead of like normal tooltip which appear on Mouse Over and disappears on mouse out.
An example this kind of tooltip is windows update tooltip , which comes without mouse over and remains constant untill u click it.
so any body has some clue.
No Worries!
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Hi,
I'm sorry to disappoint by asking you a question rather than giving you a solution.
The problem is :
I have a dialog based application in which i have created a toolbar . now i want to display tooltips for each of the items in the toolbar.
I have tried the following :
CToolTipCtrl Tips;
Tips.Create(this);
Tips.AddTool(GetDlgItem(ID_TEST),"Click to start transferring e-mails");
Tips.Activate(TRUE);
In PretranslateMessage:
Tips.RelayEvent(pMsg);
i have also tried:
CWnd *pwnd=AfxGetApp()->m_pMainWnd->GetDlgItem(IDR_TOOLBAR);
Tips.Create(this);
Tips.AddTool(pwnd->GetDlgItem(ID_TEST),"Click to start transferring e-mails");
Tips.Activate(TRUE);
but to no success .... can you please help me...
Thanking you
Regards
Satadru Karjee.
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i searched google for "tootip toolbar CDialog" and it gave me this
http://www.codeproject.com/docking/display_dialog_tooltips.asp
hopefully it will help u.
No Worries!
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I tried to use ::ExitWindowsEx(EWX_POWEROFF, 0) but it did not shut down the pc, instead, it logs off the current user. On Win2000/XP it worked properly though.
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Hello,
use InitiateSystemShutdown function.
With Regards,
R.Selvam
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InitiateSystemShutdown: Win95/98 unsupported.
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