Re: Problem reading vector<CString> from file.

From:

"Tom Serface" <tom@camaswood.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 25 Mar 2009 07:19:00 -0700

Message-ID:

<327BB2F6-6C9C-4910-8148-CF6723C35EBC@microsoft.com>

CStringArray and CStringList support serialization, but if it were me I'd do
what some others have suggested and write your own routine that saves the
data and specify the file a little more. This is why a lot of people are
using XML these days (it's straightforward to form, read, and parse back).
When saving you would create one element for each string and then read it
back creating your vector again at runtime. It makes things a lot easy to
debug when you use a readable file format as well.

Tom

"nexolite" <nexolite@discussions.microsoft.com> wrote in message
news:352AB1BB-E87B-4CE9-B38F-F9E1526E9429@microsoft.com...

I have created a class containing vector<CString> data member.
class BillSlip
{
private:

int ItemNameIndex;
vector<double> Weight,Fine,Tch,Qty,Rate,Lab;
vector<CString> ItemName;
CString CustomerName;
char BillNumber[100],Date[20];
double Material_carry,Money_carry;
double Material_paid,Money_paid;
double Material_carry_left,Money_carry_left;
double Material_debit,Money_debit;
public:
/*member functions are also there*/
};

I write the file in the following way:
fstream BillSlipFile;
BillSlip BSlip;

BillSlipFile.open("c:\\BSlipRec.txt",ios::out|ios::binary|ios::app);
BillSlipFile.write((char*)&BSlip,sizeof(BillSlip));
BillSlipFile.close();

and read the file in the following way:

BillSlipFile.open("c:\\BSlipRec.txt",ios::in|ios::binary|ios::app);
BillSlipFile.read((char*)&BSlip,sizeof(BillSlip));
MessageBox(BSlip.GetCustomerName());
while(!BillSlipFile.eof())
{
BillSlipFile.read((char*)&BSlip,sizeof(BillSlip));
MessageBox(BSlip.GetCustomerName());
}
BillSlipFile.close();

during the read operation I getting

"Unhandled exception at 0x004e774f in billingSystem.exe: 0xC0000005:
Access
violation reading location 0xcdcdcdcd."

and the debugger is pointing to

IAtlStringMgr* pNewStringMgr = pData->pStringMgr->Clone();
in static CStringData* __cdecl CloneData( __in CStringData* pData ) in
atlsimpstr.h

call stack:

billingSystem.exe!ATL::CSimpleStringT<char,0>::CloneData(ATL::CStringData
* pData=0x00c98918) Line 890 + 0xa bytes C++

billingSystem.exe!ATL::CSimpleStringT<char,0>::CSimpleStringT<char,0>(const
ATL::CSimpleStringT<char,0> &
strSrc="????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????")
Line 234 + 0x9 bytes C++

billingSystem.exe!ATL::CStringT<char,StrTraitMFC<char,ATL::ChTraitsCRT<char>

::CStringT<char,StrTraitMFC<char,ATL::ChTraitsCRT<char> > >(const

ATL::CStringT<char,StrTraitMFC<char,ATL::ChTraitsCRT<char> > > &
strSrc="????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????")
Line 1038 C++
billingSystem.exe!BillSlip::GetCustomerName() Line 52 + 0x11 bytes C++
billingSystem.exe!BillDialog::ShowRecord() Line 25 + 0x19 bytes C++
billingSystem.exe!_AfxDispatchCmdMsg(CCmdTarget * pTarget=0x0012f3cc,
unsigned int nID=0x000003f4, int nCode=0x00000000, void (void)*
pfn=0x004c39ba, void * pExtra=0x00000000, unsigned int nSig=0x00000038,
AFX_CMDHANDLERINFO * pHandlerInfo=0x00000000) Line 82 C++
billingSystem.exe!CCmdTarget::OnCmdMsg(unsigned int nID=0x000003f4, int
nCode=0x00000000, void * pExtra=0x00000000, AFX_CMDHANDLERINFO *
pHandlerInfo=0x00000000) Line 381 + 0x27 bytes C++
billingSystem.exe!CDialog::OnCmdMsg(unsigned int nID=0x000003f4, int
nCode=0x00000000, void * pExtra=0x00000000, AFX_CMDHANDLERINFO *
pHandlerInfo=0x00000000) Line 85 + 0x18 bytes C++
billingSystem.exe!CWnd::OnCommand(unsigned int wParam=0x000003f4, long
lParam=0x00020654) Line 2300 C++
billingSystem.exe!CWnd::OnWndMsg(unsigned int message=0x00000111,
unsigned
int wParam=0x000003f4, long lParam=0x00020654, long * pResult=0x0012ede4)
Line 1755 + 0x1e bytes C++
billingSystem.exe!CWnd::WindowProc(unsigned int message=0x00000111,
unsigned int wParam=0x000003f4, long lParam=0x00020654) Line 1741 + 0x20
bytes C++
billingSystem.exe!AfxCallWndProc(CWnd * pWnd=0x0012f3cc, HWND__ *
hWnd=0x000e02e6, unsigned int nMsg=0x00000111, unsigned int
wParam=0x000003f4, long lParam=0x00020654) Line 240 + 0x1c bytes C++
billingSystem.exe!AfxWndProc(HWND__ * hWnd=0x000e02e6, unsigned int
nMsg=0x00000111, unsigned int wParam=0x000003f4, long lParam=0x00020654)
Line 389 C++
user32.dll!77d48709()
[Frames below may be incorrect and/or missing, no symbols loaded for
user32.dll]
user32.dll!77d487eb()
user32.dll!77d487ff()
user32.dll!77d70494()
user32.dll!77d4b743()
user32.dll!77d4b7ab()
comctl32.dll!773f6ff6()
comctl32.dll!773f70d8()
comctl32.dll!773f93dd()
billingSystem.exe!AfxGetMainWnd() Line 34 + 0x13 bytes C++
billingSystem.exe!CWinThread::ProcessMessageFilter(int code=0x00000000,
tagMSG * lpMsg=0x0012f0f0) Line 850 + 0x5 bytes C++
billingSystem.exe!_AfxMsgFilterHook(int code=0x77d48709, unsigned int
wParam=0x00020654, long lParam=0x00000202) Line 795 C++
0012f06c()
user32.dll!77d48709()
user32.dll!77d487eb()
user32.dll!77d4ecd2()
user32.dll!77d70494()
user32.dll!77d489a5()
user32.dll!77d553a0()
user32.dll!77d70494()
user32.dll!77d489e8()
user32.dll!77d6e819()
user32.dll!77d65ce2()
billingSystem.exe!CWnd::IsDialogMessageA(tagMSG * lpMsg=0x001558d0) Line
198 C++
billingSystem.exe!CWnd::PreTranslateInput(tagMSG * lpMsg=0x001558d0)
Line
4268 C++
billingSystem.exe!CDialog::PreTranslateMessage(tagMSG * pMsg=0x001558d0)
Line 80 C++
billingSystem.exe!CWnd::WalkPreTranslateTree(HWND__ *
hWndStop=0x000e02e6,
tagMSG * pMsg=0x001558d0) Line 2882 + 0x14 bytes C++
billingSystem.exe!AfxInternalPreTranslateMessage(tagMSG *
pMsg=0x001558d0)
Line 233 + 0x12 bytes C++
billingSystem.exe!CWinThread::PreTranslateMessage(tagMSG *
pMsg=0x001558d0) Line 773 + 0x9 bytes C++
billingSystem.exe!AfxPreTranslateMessage(tagMSG * pMsg=0x001558d0) Line
252 + 0x11 bytes C++
billingSystem.exe!AfxInternalPumpMessage() Line 178 + 0x18 bytes C++
billingSystem.exe!CWinThread::PumpMessage() Line 896 C++
billingSystem.exe!AfxPumpMessage() Line 190 + 0xd bytes C++
billingSystem.exe!CWnd::RunModalLoop(unsigned long dwFlags=0x00000004)
Line 4322 + 0x5 bytes C++
billingSystem.exe!CDialog::DoModal() Line 587 + 0xc bytes C++
billingSystem.exe!BillingApp::InitInstance() Line 423 C++
billingSystem.exe!AfxWinMain(HINSTANCE__ * hInstance=0x00400000,
HINSTANCE__ * hPrevInstance=0x00000000, char * lpCmdLine=0x00151f4d, int
nCmdShow=0x00000001) Line 37 + 0xd bytes C++
billingSystem.exe!WinMain(HINSTANCE__ * hInstance=0x00400000, HINSTANCE__
* hPrevInstance=0x00000000, char * lpCmdLine=0x00151f4d, int
nCmdShow=0x00000001) Line 33 C++
billingSystem.exe!__tmainCRTStartup() Line 324 + 0x35 bytes C
billingSystem.exe!WinMainCRTStartup() Line 196 C
kernel32.dll!7c816d4f()
kernel32.dll!7c8399f3()

Please Help me.