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You should really learn to use your debugger properly. You can't come post a question on the forum each time your program crashes. The debugger is a very powerfull tool and you should really start to learn how to use it, it can make you gain a lot of time. It's very difficult to help you without being able to use a debugger.
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Le@rner wrote:
else
{
CString temp = buf;
return temp;
}
Your problem is here. Guess why 
AR
When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)
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can i use it like this
return buf;
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The problem is that you don't terminate your string when you call recv. See this thread[^] (just below) for more info.
Now, if you would have used your debugger, you would probably have spotted the problem immediately (by inspecting the string which is not terminated).
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No, buf is not null terminated 
When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)
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Alain Rist wrote: Your problem is here
Nope, the problem is with the call to recv.
Well, it depends what you meant exactly . This line in itself is not the fault, the problem is that buf is non terminated which could cause serious problems when copying into a CString object.
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He could have constructed his CString with a length
When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)
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please explain me where is the problem and how can i resolve it.
thanks in advance.
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See Cedric's detailed explanations[^].
When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)
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It's been explained to you nearly a half dozen times. What more do you require? 
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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Hey I googled for this kinda stuff but only useless stuff came up..
Anyway
char buffer[250];
send(sock, "hello?\n", 8, 0);
recv(sock, buffer, sizeof(buffer), 0);
cout << buffer << endl;
cin.get();
is my code.
Now I obviously do not know how big the buffer will be, the problem is if i set buffer[250], everything after the actual content is trash.
How would I fix that?
Like I wanna see only the actual content and not the jibberish after it.
Thanks.
e// nevermind, I just found out that recv returns the size..
modified on Tuesday, November 16, 2010 7:57 PM
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The documentation for recv[^] shows the prototype looks something like this:
int recv(
__in SOCKET s,
__out char *buf,
__in int len,
__in int flags
);
It describes the return value like this:
If no error occurs, recv returns the number of bytes received and the buffer pointed to by the buf parameter will contain this data received. If the connection has been gracefully closed, the return value is zero.
Otherwise, a value of SOCKET_ERROR is returned, and a specific error code can be retrieved by calling WSAGetLastError.
So what you have to do is add a NULL terminator and where you add it depends on how much data you recieved:
char buffer[250];
char hello[] = "hello?\n";
send(sock, hello, sizeof(hello), 0);
int res = recv(sock, buffer, sizeof(buffer)-1, 0);
if (res != SOCKET_ERROR)
{
buffer[res] = 0;
cout << buffer << endl;
}
cin.get();
Steve
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Well put together answer; an example to us all.
Just say 'NO' to evaluated arguments for diadic functions! Ash
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hello guys... I have a file MyClass.cpp inwhich I declared a vector array. I then added some string data to it and want to access it in MyProjDlg.cpp. It is dialoged based app in vc6. Here it is
MyClass.cpp
-----------
using namespace std;
typedef vector<LPTSTR> StudentData;
void someFunc()
{
StudentData std;
std.push_back(stdentName);
}
MyProjDlg.cpp
-------------
extern StudentData std;
for (int i=0; i<5; i++)
listbox.AddString(std.pop_back());
it is showing 7 defferent errors....any idea whats wrong that im doing?
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in general, you cannot access a function's local variables outside that function.
if you need a variable to be shared across functions, you can:
1. make the variable global (in general, this is poor style)
2. make it a member of the class
3. pass the variable into the function
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You have defined StudentData with a typedef in MyClass.cpp, and then referenced it without definition in MyProjDlg.cpp. Please review the suggestions to your original question on this subject, and also read up on the use of the extern keyword.
[EDIT]Stephen Hewitt even gave you a complete solution to your problem here[^].[/EDIT]
Just say 'NO' to evaluated arguments for diadic functions! Ash
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Richard MacCutchan wrote: Stephen Hewitt even gave you a complete solution to your problem here
thnx.....since <<_superman_>> asked me to use vectors...I did not come to this post again, eventually losing valuable information given by Stephen. thnx
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Hi all,
please tell me how can i use Propetypage as dialog box.
i DoModal() the property page and its open but its not close by any option like OnOK,OnCancel or OnClose.
please tell me how i do this.
thanks in advance.
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Why do you want to use a PropertyPage as a dialog box  ?
It is not its purpose. Why don't you simply use a standard dialog ?
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actully i need the same dialog as property page that is i already use,so i try
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CPropertyPage::OnOK() will be called from CPropertySheet::OnOK(), and see here what does the default implementation of CPropertyPage::OnOk does.
CPropertyPage::OnOK
So When you are using the property page as simple dialog, call CDialog::OnOK() to get what you expect.
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tab and esc key not working here.
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Option is, when you are using property page as a dialog,let the messages be handled by CDialog rather than cPropertyPage. Over-ride PreTranslateMessage for this purpose.
BOOL CMyPropPage::PreTranslateMessage(MSG* pMsg)
{
return CDialog::PreTranslateMessage(pMsg);
}
seems crazy 
If you are overriding OnCancel(), call CDialog::OnCancel() to dismiss the dialog on escape key.
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You can use a single DIALOG resource in a CDialog derived and a CPropertyPage derived class. Use the same IDD identifier.
class MyPropPage : public CPropertyPage
{
enum { IDD = IDD_MYPAGE };
};
class CMyPropPageDlg : public CDialog
{
enum { IDD = IDD_MYPAGE };
};
cheers,
AR
When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)
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Le@rner wrote: please tell me how can i use Propetypage as dialog box.
This makes no sense. If you have a property sheet that contains one property page (i.e., tab), you effectively have a dialog box, albeit one that looks "oddly." Unless you have more than one page, just use a dialog box.
See here, here, here, and here for examples.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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