Re: Class CxxxxView:CFormView - C / C++ / MFC Discussion Boards

Re: CListCtrl & theCtrl = GetListCtrl

David Crow16-Dec-10 2:20

David Crow

16-Dec-10 2:20

cy163@hotmail.com wrote:
You mean ONLY one ListCtrl can be associated with one view?

Yes, unless the view is a CFormView.

cy163@hotmail.com wrote:
If so, Why there may be more than one ListCtrl in a dialog

Because a dialog is not a view.

cy163@hotmail.com wrote:
Or, I misunderstand the view concept.

Perhaps. But, have no fear, there's plenty of online documentation/examples to help you out.

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Re: CListCtrl & theCtrl = GetListCtrl

cy163@hotmail.com17-Dec-10 0:15

cy163@hotmail.com

17-Dec-10 0:15

If a view is drived from CFormView. How to distinguish between ListCtrls associated with it.

Re: CListCtrl & theCtrl = GetListCtrl

David Crow17-Dec-10 5:01

David Crow

17-Dec-10 5:01

They each have a unique control ID, and thus a separate instance of CListCtrl.

Re: CListCtrl & theCtrl = GetListCtrl

cy163@hotmail.com18-Dec-10 2:05

cy163@hotmail.com

18-Dec-10 2:05

So, for a view derived from a non CFormView, GetListCtrl is used to get the reference of the ListCtrl associated with it.

for a view derived from a CFormView, how to get the references of ListCtrls associated with it. What command should be used.

Re: CListCtrl & theCtrl = GetListCtrl

David Crow19-Dec-10 14:09

David Crow

19-Dec-10 14:09

cy163@hotmail.com wrote:
So, for a view derived from a non CFormView...

Specifically, a CListView.

cy163@hotmail.com wrote:
for a view derived from a CFormView, how to get the references of ListCtrls associated with it.

Like a dialog, each control has a unique ID and its own control variable (e.g., CListCtrl).

Class CxxxxView:CFormView

cy163@hotmail.com13-Dec-10 4:00

cy163@hotmail.com

13-Dec-10 4:00

I am using VC 6.0. I would like to create a CFormView based project by using ClassWizard, so that I can see the following line in the CxxxxView class.

Class CxxxxView:CFormView
{
....
....
}

Please tell me how to do this using ClassWizard,

Thanks

Re: Class CxxxxView:CFormView

«_Superman_»13-Dec-10 7:20

«_Superman_»

13-Dec-10 7:20

The base view class to be used can be selected from the second last page I guess.
Click on your view class and select its base class.
The default is CView.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: Class CxxxxView:CFormView

cy163@hotmail.com13-Dec-10 15:42

cy163@hotmail.com

13-Dec-10 15:42

Thanks you superman for your reply.

Another question concerns the following code snippet. I wonder why

CListView::OnInitialUpdate();

can be called directly, without declaring an instance of the class CListView.

void CMyListView::OnInitialUpdate()
{
   CListView::OnInitialUpdate();

   // this code only works for a report-mode list view
   ASSERT(GetStyle() & LVS_REPORT);

   // Gain a reference to the list control itself
   CListCtrl& theCtrl = GetListCtrl();

   // Insert a column. This override is the most convenient.
   theCtrl.InsertColumn(0, _T("Player Name"), LVCFMT_LEFT);

   // The other InsertColumn() override requires an initialized
   // LVCOLUMN structure.
   LVCOLUMN col;
   col.mask = LVCF_FMT | LVCF_TEXT;
   col.pszText = _T("Jersey Number");
   col.fmt = LVCFMT_LEFT;
   theCtrl.InsertColumn(1, &col);

   // Set reasonable widths for our columns

Re: Class CxxxxView:CFormView

«_Superman_»13-Dec-10 16:00

«_Superman_»

13-Dec-10 16:00

CListView is the base class of CMyListView.
The object already existing is made of both these classes and of course the other base classes.
So creating another object will not effect the current object.
Also, this is the way the overridden derived class function calls the base class function.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Polymorphism in C

Re: Class CxxxxView:CFormView

yu-jian14-Dec-10 17:56

yu-jian

14-Dec-10 17:56

CListView::OnInitialUpdate();
is equals this->CListView::OnInitialUpdate();

CMyListView is derived from CListView. It can derives base class's function {public, protected}.

OnInitialUpdate is the virtual function. CListView::OnInitialUpdate() means call the base class 's function OnInitialUpdate() .

I think that you should read <<c++ primary="">> <<mfc programming="">> firstly.

Re: Class CxxxxView:CFormView

cy163@hotmail.com15-Dec-10 19:51

cy163@hotmail.com

15-Dec-10 19:51

Thanks for your attention on my postinngs and your replyes.

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

timbk13-Dec-10 2:30

timbk

13-Dec-10 2:30

Hello, I have to Write/read a file with a structure wich contains CString data, if drop out the CString data from the structure it works but if I left the CString data the program crashes when attemps to read.
Here the structure

struct MyStructure
{
CString label//For others data types char, BYTE, etc it works but for CString it doesn't 
unsignet char data1
BYTE data2
}

the writing

    struct MyStructure Estructura;
    CFile FileConfig;              

FileConfig.Open("ROMconfig.dat",CFile::modeCreate|CFile::modeNoTruncate|CFile::modeWrite);
     FileConfig.Seek(0,CFile::begin);
     FileConfig.Write(&Estructura,sizeof(Estructura));
     FileConfig.Close();

the reading

	struct MyStructure Estructura;
	CFile FileConfig ;		  

FileConfig.Open("ROMconfig.dat",CFile::modeCreate|CFile::modeNoTruncate|CFile::modeRead);
	FileConfig.Seek(0,CFile::begin);
	FileConfig.Read(&Estructura,sizeof(Estructura));
        FileConfig.Close();

What I'm doing wrong, may be is something in relation with CString size, but I'm not sure.
And the file has to be a .dat file because is modification to an older application.

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

Cedric Moonen13-Dec-10 2:43

Cedric Moonen

13-Dec-10 2:43

You can't save and read your data this way. Internally, a CString object stores its data in a pointer, so you will save only the address of the pointer and not its content. I suggest you read this article[^] which is about serialization in MFC. You'll get some ideas about how to serialize your data properly.

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 ?

timbk13-Dec-10 3:21

timbk

13-Dec-10 3:21

Ok, thanks , i will check it, very usefull. But for the other data types is it ok to save data i as described before? , I mean pherhaps is not the elegant way but it's working (not with CString), as I have to finish this work for tomorrow I was hoping there was a easier way, I only have to store some few words.

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

Cedric Moonen13-Dec-10 3:25

Cedric Moonen

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.
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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 | :)

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