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Why not set a breakpoint on the first statement in this function and then use the debugger to single-step through the code?
"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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hi friends,
i am a beginner in C++.
Can any one give me an idea about the use of #ifndef and #define ?
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See here.
"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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Hi all,
in my application this execption occur please describe me how can i thow or handle this.
and what is the type of this execption like,memory,File etc.
First-chance exception at 0x0126a8a4 in test.exe: 0xC0000005: Access violation reading location 0xfeeefeee.
Unhandled exception at 0x0126a8a4 in test.exe: 0xC0000005: Access violation reading location 0xfeeefeee.
please help me for this.
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Hi,
Le@rner wrote: First-chance exception at 0x0126a8a4 in test.exe: 0xC0000005: Access violation reading location 0xfeeefeee
Your code loaded at 0x0126a8a4 attempts to read memory through an unitialized pointer.
When it happens, use the call stack in your debugger to find your faulty code and fix it 
cheers,
AR
When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)
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condition 1:
wininet.dll!761cf6ea()
[Frames below may be incorrect and/or missing, no symbols loaded for wininet.dll]
wininet.dll!7620ecc0()
wininet.dll!761c9986()
wininet.dll!761df27b()
wininet.dll!761df0f1()
wininet.dll!761c57b3()
wininet.dll!761c5c59()
wininet.dll!761df4c3()
> Test.exe!CAmHttpSocket::OpenUrl(const char * url=0x23b38df0) Line 225 + 0x17 bytes C++
Test.exe!CAmHttpSocket::GetHeaders(const char * url=0x23b38df0) Line 187 C++
Test.exe!CHttp_Mon_Thread::HTTPResponseThread() Line 58 + 0xe bytes C++
Test.exe!CHttp_Mon_Thread::OnTimer(unsigned int idEvent=15901, long dwTime=10345141) Line 140 + 0x7 bytes C++
Test.exe!CWinThread::DispatchThreadMessageEx(tagMSG * pMsg=0x37f106c0) Line 771 C++
Test.exe!AfxInternalPreTranslateMessage(tagMSG * pMsg=0x37f106c0) Line 227 + 0xd bytes C++
Test.exe!CWinThread::PreTranslateMessage(tagMSG * pMsg=0x37f106c0) Line 777 + 0x8 bytes C++
Test.exe!AfxPreTranslateMessage(tagMSG * pMsg=0x37f106c0) Line 255 C++
Test.exe!AfxInternalPumpMessage() Line 178 + 0xf bytes C++
Test.exe!CWinThread::Run() Line 629 + 0x7 bytes C++
Test.exe!_AfxThreadEntry(void * pParam=0x0017f00c) Line 126 C++
Test.exe!_callthreadstartex() Line 348 + 0x6 bytes C
Test.exe!_threadstartex(void * ptd=0x23adbb70) Line 326 + 0x5 bytes C
kernel32.dll!7662eccb()
ntdll.dll!778dd24d()
ntdll.dll!778dd45f()
condition 2:
> Test.exe!ATL::CStringData::Release() Line 111 + 0x7 bytes C++
Test.exe!ATL::CSimpleStringT<char,0>::operator=(const ATL::CSimpleStringT<char,0> & strSrc="10022*Socket Error") Line 300 C++
Test.exe!CSmtp_Mon_Thread::SmtpResponseThread(ATL::CStringT<char,StrTraitMFC<char,ATL::ChTraitsCRT<char> > > URL_Name="http://exby.org", unsigned int Port=1079503120) Line 141 + 0x16 bytes C++
Test.exe!CSmtp_Mon_Thread::OnSmtpTimer(unsigned int idEvent=17291, long dwTime=10345141) Line 69 C++
Test.exe!CWinThread::DispatchThreadMessageEx(tagMSG * pMsg=0x14e5cd50) Line 771 C++
Test.exe!AfxInternalPreTranslateMessage(tagMSG * pMsg=0x14e5cd50) Line 227 + 0xd bytes C++
Test.exe!CWinThread::PreTranslateMessage(tagMSG * pMsg=0x14e5cd50) Line 777 + 0x8 bytes C++
Test.exe!AfxPreTranslateMessage(tagMSG * pMsg=0x14e5cd50) Line 255 C++
Test.exe!AfxInternalPumpMessage() Line 178 + 0xf bytes C++
Test.exe!CWinThread::Run() Line 629 + 0x7 bytes C++
Test.exe!_AfxThreadEntry(void * pParam=0x003af3a4) Line 126 C++
Test.exe!_callthreadstartex() Line 348 + 0x6 bytes C
Test.exe!_threadstartex(void * ptd=0x21f742d8) Line 326 + 0x5 bytes C
kernel32.dll!7662eccb()
[Frames below may be incorrect and/or missing, no symbols loaded for kernel32.dll]
ntdll.dll!778dd24d()
ntdll.dll!778dd45f()
condition 3:
> Test.exe!ATL::CStringData::Release() Line 111 + 0x7 bytes C++
Test.exe!CErrorNotifications::~CErrorNotifications() Line 52 + 0x3e bytes C++
Test.exe!CErrorNotifications::`scalar deleting destructor'() + 0x8 bytes C++
Test.exe!CWinThread::Delete() Line 591 C++
Test.exe!AfxEndThread(unsigned int nExitCode=0, int bDelete=1) Line 381 C++
Test.exe!CErrorNotifications::ErrorNotificationThread() Line 182 C++
Test.exe!CErrorNotifications::InitInstance() Line 59 C++
Test.exe!_AfxThreadEntry(void * pParam=0x4458f9a4) Line 113 + 0x7 bytes C++
Test.exe!_callthreadstartex() Line 348 + 0x6 bytes C
Test.exe!_threadstartex(void * ptd=0x22175248) Line 326 + 0x5 bytes C
kernel32.dll!7662eccb()
[Frames below may be incorrect and/or missing, no symbols loaded for kernel32.dll]
ntdll.dll!778dd24d()
ntdll.dll!778dd45f()
now please help me
modified on Wednesday, November 17, 2010 4:31 AM
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Use your debugger to inspect the problem more in detail. Step into the code to inspect the different variables.
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Le@rner wrote: now please help me
 Follow your code in the debugger ahead of the place where you generate a socket error with "http://exby.org".
When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)
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CSMTP smtp;
StatusTh = smtp.get_response();
CString CSMTP::get_response()
{
try
{
char buf[240];
sock_error=WSAGetLastError();
if(sock_error!=0)
{
if(sock_error==10048)
sock_str = "10048*Address already in use";
else if(sock_error==10049)
sock_str = "10049*Cannot assign requested address";
else if(sock_error==10050)
sock_str = "10050*Network is down";
else if(sock_error==10051)
sock_str = "10051*Network is unreachable";
else if(sock_error==10060)
sock_str = "10060*Connection timed out";
else if(sock_error==10064)
sock_str = "10064*Host is down";
else if(sock_error==10061)
sock_str = "10061*Connection refused";
else if(sock_error==10054)
sock_str = "10054*Connection reset by peer";
else
{
sock_str.Format("%d",sock_error);
sock_str = sock_str + "*Socket Error";
}
return sock_str;
}
recv(sock,buf,sizeof(buf),0);
sock_error=WSAGetLastError();
if(sock_error!=0)
{
if(sock_error==10048)
sock_str = "10048*Address already in use";
else if(sock_error==10049)
sock_str = "10049*Cannot assign requested address";
else if(sock_error==10050)
sock_str = "10050*Network is down";
else if(sock_error==10051)
sock_str = "10051*Network is unreachable";
else if(sock_error==10060)
sock_str = "10060*Connection timed out";
else if(sock_error==10064)
sock_str = "10064*Host is down";
else if(sock_error==10061)
sock_str = "10061*Connection refused";
else if(sock_error==10054)
sock_str = "10054*Connection reset by peer";
else
{
sock_str.Format("%d",sock_error);
sock_str = sock_str + "*Socket Error";
}
return sock_str;
}
else
{
CString temp = buf;
return temp;
}
}
catch( CMemoryException* e )
{
e->Delete();
}
catch( CFileException* e )
{
e->Delete();
}
catch( CException* e )
{
e->Delete();
}
}
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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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