Exception - C / C++ / MFC Discussion Boards

Re: how to Read/Write to a file a structure wich contains Cstring ?

Cedric Moonen13-Dec-10 3:25

13-Dec-10 3:25

It would be easier to provide a function to save and a function to load the structure (functions in the structure itself). These functions will save and load all members of the structure. For the CString type, you first have to save the lenght of the string then the string itself (when loading, you read the lenght and then read that many characters from the file).

Cédric Moonen
Software developer

Charting control [v3.0]
OpenGL game tutorial in C++

Re: how to Read/Write to a file a structure wich contains Cstring ?

Richard MacCutchan13-Dec-10 7:19

Richard MacCutchan

13-Dec-10 7:19

If you are using MFC then you could use the CArchive[^] class.

Just say 'NO' to evaluated arguments for diadic functions! Ash

SHFileOperation in win XP?

zon_cpp12-Dec-10 19:23

zon_cpp

12-Dec-10 19:23

hi what is the note of using SHFileOperation function in win XP?
my program work correctly in vista but in XP it is crashed!
please help me

Zo.Naderi-Iran

Re: SHFileOperation in win XP?

CPallini12-Dec-10 20:59

CPallini

12-Dec-10 20:59

Connot you debug it? At least, to get better help, you should post here the relevant code.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: SHFileOperation in win XP?

zon_cpp12-Dec-10 22:24

zon_cpp

12-Dec-10 22:24

oh, thank you and excuse me
my problem solved.
its problem was in VS 2005. with VS 2008, it is ok.
thanks

Zo.Naderi-Iran

save image with annotation

raju_shiva12-Dec-10 18:53

raju_shiva

12-Dec-10 18:53

Hi all,
I want save the image with the annotation made on it.But i am able to save only the image but not the annotation.
I am using LeadTools 16.5 version(C DLL).
I know this is not the right place for this question.
But if anyone knows how to save the image with annotation .please help me.
I will be really greatful to you

Thanks
Raj

Re: save image with annotation

Hadi Dayvary13-Dec-10 7:02

Hadi Dayvary

13-Dec-10 7:02

Hi You musr ask your question in leadtools forum.
Are you working on a DICOM/PACS project?

www.logicsims.ir

Exception

MsmVc12-Dec-10 18:38

MsmVc

12-Dec-10 18:38

Hi All

I try to create database and table in Access database through this way.

_CatalogPtr m_pCatalog  = NULL;
CString con="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\test.mdb;Jet OLEDB:Engine Type=5";
 HRESULT hr = S_OK;
		   try
 	{
			
		
       TESTHR(hr = m_pCatalog.CreateInstance(__uuidof (Catalog)));
	
	m_pCatalog->Create((_bstr_t)con);
}
 catch(_com_error pCE)
    {
}


.
.//create table
.
.
m_pCatalog->Release();
 CoUninitialize();

Database name(test.mdb) read from list(list have more than one database name).I use here m_pCatalog->Release();
Now when i select different database name that time this line TESTHR(hr = m_pCatalog.CreateInstance(__uuidof (Catalog)));
through exception.
Exception show

HRESULT CreateInstance(const CLSID& rclsid, IUnknown* pOuter = NULL, DWORD dwClsContext = CLSCTX_ALL) throw()
   {
       HRESULT hr;

          point out this line 
       _Release();//this line

       if (dwClsContext & (CLSCTX_LOCAL_SERVER | CLSCTX_REMOTE_SERVER)) {
           IUnknown* pIUnknown;
           hr = CoCreateInstance(rclsid, pOuter, dwClsContext, __uuidof(IUnknown), reinterpret_cast<void**>(&pIUnknown));

           if (SUCCEEDED(hr)) {
               hr = OleRun(pIUnknown);

               if (SUCCEEDED(hr)) {
                   hr = pIUnknown->QueryInterface(GetIID(), reinterpret_cast<void**>(&m_pInterface));
               }

               pIUnknown->Release();
           }
       }
       else {
           hr = CoCreateInstance(rclsid, pOuter, dwClsContext, GetIID(), reinterpret_cast<void**>(&m_pInterface));
       }

       if (FAILED(hr)) {
           // just in case refcount = 0 and dtor gets called
           m_pInterface = NULL;
       }

       return hr;
   }

I use m_pCatalog->Release() because once i create database and table then i try to free particular database.
Please help me

Re: Exception

CPallini12-Dec-10 21:08

CPallini

12-Dec-10 21:08

What was the exception message?
Smile | :)

Re: Exception

MsmVc12-Dec-10 22:22

MsmVc

12-Dec-10 22:22

Thanks for reply

Unhandled exception at 0x004098ec in test.exe: 0xC0000005: Access violation reading location 0x00000008

Re: Exception

CPallini12-Dec-10 22:30

CPallini

12-Dec-10 22:30

Did you call Release, CoUninitialize, and then CreateInstance aqain?
Smile | :)

Re: Exception

MsmVc12-Dec-10 22:59

MsmVc

12-Dec-10 22:59

yes you are right..

Dear buddy, I am mad, can you help me and don't drop me as sacrifice

nenfa12-Dec-10 16:58

nenfa

12-Dec-10 16:58

Hi,
When I am trying to import data from excel to table it's giving me following error :-
An exception of type 'System.Data.OleDb.OleDbException' occurred in System.Data.dll but was not handled in user code

Additional information: External table is not in the expected format.

I am using following code:-
Collapse
OleDbConnection excelConn = new OleDbConnection();
excelConn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source='" + filelocation + "';Extended Properties=Excel 8.0");
excelConn.Open();

Re: Dear buddy, I am mad, can you help me and don't drop me as sacrifice

nenfa14-Dec-10 15:09

nenfa

14-Dec-10 15:09

if i open the excel file with excel 2003, then i'll do the query again for the file,everything goes fine, why?

how can i get the data from xls, without open it in the excel 2003 at the same time, who can help me ? thanks very much!

Can not delete multiple files with ReadDirectoryChangesW

ShadowUz12-Dec-10 13:30

ShadowUz

12-Dec-10 13:30

Hi everyone!

I'm using ReadDirectoryChangesW for tracking any changes in the dedicated Source folder and apply it to the Destination folder.
But, when multiple files are selected and deleted at once in the Source folder, only the first file is deleted in the Destination folder.

Is there any way to delete all files at once?

Thanks beforehand.

Re: Can not delete multiple files with ReadDirectoryChangesW

Luc Pattyn12-Dec-10 14:12

Luc Pattyn

12-Dec-10 14:12

I haven't used this myself, however reading the MSDN documentation it seems ReadDirectoryChangesW fills a buffer with one or more FILE_NOTIFY_INFORMATION structures, of which the NextEntryOffset field is the key to finding the next (unless zero). From your description, it seems you are ignoring this field.

[ADDED] The doc also says nothing gets returned when the buffer is too small, which is more likely to happen when lots of things need reported at the same time. You may want to ask for a bigger buffer. [/ADDED]

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

Re: Can not delete multiple files with ReadDirectoryChangesW

David Crow13-Dec-10 3:16

David Crow

13-Dec-10 3:16

mints555 wrote:
But, when multiple files are selected and deleted at once in the Source folder, only the first file is deleted in the Destination folder.

If you are having trouble deleting files, what does that have to do with ReadDirectoryChangesW()? Confused | :confused:

What does your deletion code look like?

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Create Bitmap from mousemovement in picturebox MFC

josipahutar12-Dec-10 9:48

josipahutar

12-Dec-10 9:48

hi guys,,,

i'm have a project about MFC. how to create bitmap from mousemovent??
for mousemovent i'm can write to picturebox.
the code is written in mfc wizard exe in a dialog based application.

for picturebox -> IDC_PIC
for button -> IDC_SAVE

my code:

void CSignature1Dlg::OnMouseMove(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
m_pic1.GetSafeHwnd();
HCURSOR hcur = NULL;
CRect rc;
m_pic1.GetClientRect(&rc);
rc.NormalizeRect();

rc.left=0;
rc.right=250;
rc.top=0;
rc.bottom=250;

POINT MousePosition = point;

BOOL isOnPictureControl = PtInRect(&rc, MousePosition);

if((m_iPrevX >=rc.left && m_iPrevX <=rc.right) && (m_iPrevY >=rc.top && m_iPrevY <=rc.bottom )){
if((nFlags & MK_LBUTTON) == MK_LBUTTON)
{
CDC* pDC = m_pic1.GetDC();
CDC dcMem;
dcMem.CreateCompatibleDC(pDC);
dcMem.SelectObject(&m_bmpBitmap);
CPen pen (PS_SOLID,2,RGB(0,0,0));
pDC->SelectObject (&pen);
pDC->MoveTo(m_iPrevX,m_iPrevY);
pDC->LineTo(point.x,point.y);
pDC->SetPixel(point.x,point.y, RGB(0,0,0)) ;
m_iPrevX=point.x;
m_iPrevY=point.y;

}

}

CDialog::OnMouseMove(nFlags, point);
}

void CSignature1Dlg::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
HCURSOR hcur = NULL;
CRect rc;
m_pic1.GetClientRect(&rc);
rc.NormalizeRect();

m_iPrevX=point.x;
m_iPrevY=point.y;

CDialog::OnLButtonDown(nFlags, point);
}

void CSignature1Dlg::OnSave()
{
// TODO: Add your control notification handler code here

?????????
}

so give me advice, how to can create and save the mousemovent into bitmap??? Confused | :confused:

i hope u can help me... Hmmm | :|

Re: Create Bitmap from mousemovement in picturebox MFC

Alain Rist12-Dec-10 10:00

Alain Rist

12-Dec-10 10:00

josipahutar wrote:
so give me advice, how to can create and save the mousemovent into bitmap???

See the Scribble MFC sample[^].
cheers,
AR

When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)

Re: Create Bitmap from mousemovement in picturebox MFC

josipahutar13-Dec-10 7:21

josipahutar

13-Dec-10 7:21

thx your reply sir..
i dont understand because i newbie in MFC.. Confused | :confused:

so can u give me a example about my problem...

Regard's
Johannes

Re: Create Bitmap from mousemovement in picturebox MFC

David Crow13-Dec-10 8:01

David Crow

13-Dec-10 8:01

josipahutar wrote:
so can u give me a example about my problem...

This MFC tutorial gives a little bit of everything, even for newbies.

Re: Create Bitmap from mousemovement in picturebox MFC

Alain Rist13-Dec-10 9:20

Alain Rist

13-Dec-10 9:20

Hi,
The example is the CScribbleView class code for:

virtual void OnDraw(CDC* pDC);  // overridden to draw this view

afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
afx_msg void OnLButtonUp(UINT nFlags, CPoint point);
afx_msg void OnMouseMove(UINT nFlags, CPoint point);

.

If you cannot study this code and understand how it is an answer to your question think of another kind of working area Wink | ;)

cheers,
AR

When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)

[Solved] Speech sample not running.... [modified]

AmbiguousName12-Dec-10 8:01

AmbiguousName

12-Dec-10 8:01

hello guys... i got this small speech api sample and tried to compile but got this error.

error C2440: 'static_cast' : cannot convert from 'void (__thiscall CSpeechDlg::* )(void)' to 'LRESULT (__thiscall CWnd::* )(WPARAM,LPARAM)'

This is where it takes me when hiting on the error.

ON_MESSAGE(WM_RECOEVENT,OnRecoEvent)

This is the function signature of OnRecoEvent

void CSpeechDlg::OnRecoEvent()

And this is what WM_RECOEVENT is..

#define WM_RECOEVENT    WM_USER+5      // Window message used for recognition events

what should I do? thnx

modified on Monday, December 13, 2010 3:44 AM

Re: Speech sample not running....

Richard MacCutchan12-Dec-10 9:37

Richard MacCutchan

12-Dec-10 9:37

Your OnRecoEvent() function is called in response to a Windows message so it must follow the rules as explained in the error message. That is to say, it takes a WPARAM and an LPARAM as input parameters and returns an LRESULT.

Just say 'NO' to evaluated arguments for diadic functions! Ash

Re: Speech sample not running....

Emilio Garavaglia12-Dec-10 9:42

Emilio Garavaglia

12-Dec-10 9:42

The prototype for an ON_MESSAGE invoked member-function should be

LRESULT(::*)(WPARAM, LPARAM)

and not

void(::*)()

as you did.

2 bugs found.
> recompile ...
65534 bugs found.
D'Oh! | :doh:

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