Re: Problem with variables - C / C++ / MFC Discussion Boards

Re: Communication between TreeView and FormView

Paresh Chitte8-Jun-08 23:37

8-Jun-08 23:37

Will CDocument::UpdateAllViews will help you ?

http://msdn.microsoft.com/en-us/library/eys41xfw(VS.80).aspx[^]

Also look at the example given below,

http://msdn.microsoft.com/en-us/library/ysfkkk2h(VS.80).aspx[^]

Regards,
Paresh.

Re: Communication between TreeView and FormView

sudhir_Kumar8-Jun-08 23:48

sudhir_Kumar

8-Jun-08 23:48

You are creating new View object CRightView *rView = new CRightView();.Instead of this you should get the the attached View object.

-@SuDhIrKuMaR@-

Re: Communication between TreeView and FormView

Maxim Zarus9-Jun-08 0:02

Maxim Zarus

9-Jun-08 0:02

Sir, I am very confused.
Please give me some example.
How do I create attached view object?

Re: Communication between TreeView and FormView

sudhir_Kumar9-Jun-08 0:18

sudhir_Kumar

9-Jun-08 0:18

Try to run this code.
CFrameWnd * pFrame = (CFrameWnd *)(AfxGetApp()->m_pMainWnd);
CView* pFrmView = pFrame->GetActiveView ();

CRightView *rView = NULL;

if (pFrmView->IsKindOf (RUNTIME_CLASS (CRightView)))
rView = (CRightView *)pFrmView;

(Your Doc Class Name) * pDoc = GetDocument()

if(rView == NULL)
{
POSITION pos = pDoc->GetFirstViewPosition();
while (pos)
{
CView* pView = GetNextView (pos);
if (pView->IsKindOf (RUNTIME_CLASS (CFormView)))
{
rView = (CRightView *)pFrmView;
}
}
}

if(rView!=NULL)
{
rView->m_Edit1.SetWindowText(_T("ok"));
}

-@SuDhIrKuMaR@-

Re: Communication between TreeView and FormView

Maxim Zarus9-Jun-08 0:42

Maxim Zarus

9-Jun-08 0:42

Now, i get this error:
Unhandled exception at 0x00530a33 in MyPrg.exe: 0xC0000005: Access violation reading location 0x1271e40a.
and control goes to:

void CWnd::SetWindowText(LPCTSTR lpszString)
{
	ENSURE(this);
	ENSURE(::IsWindow(m_hWnd) || (m_pCtrlSite != NULL));

	if (m_pCtrlSite == NULL)
		::SetWindowText(m_hWnd, lpszString);
	else
		m_pCtrlSite->SetWindowText(lpszString);// control points here
}

Problem with variables

pl_kode8-Jun-08 23:18

pl_kode

8-Jun-08 23:18

I had posted this earlier but no reply. Sorry for posting it again

This is how it is...

My Class is defined in newclass.h as...

Class A
{
public:
    	void out_func1();  
	void out_func2();  
  class B 	
  {   
  public:  
 	  string path;  
  	  in_func1();  
 };
};

I then Get the path at intialize.cpp as follows....

void A::out_func1()
{
 B obj;	
 obj.path="c:\folder\file1.txt";
}

Then I try to open the file to write in write.cpp...

void A::out_func2()
{	
 B obj;	
 ofstream myfile;
 myfile.open (obj.path.c_str(), ios::app);
...
}

This crashes.I have included the header initialise.h too.
Please let me know were I could have gone wrong. I think I am having problem with the scope of the varible. But I am not sure.

THANKS.

Re: Problem with variables

Naveen8-Jun-08 23:24

Naveen

8-Jun-08 23:24

out_func1() and out_func2() uses different instance of the class B. You should use same instance of class B in both functions.

nave

[OpenedFileFinder]

Re: Problem with variables

CPallini8-Jun-08 23:24

CPallini

8-Jun-08 23:24

Actually you got replies.
I repeat myself: no wonder your application crashes, you're passing a uninitialized path to myfile.open.

Hint: usage of locals where class member (or method parameter) should be used.
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

Re: Problem with variables

_AnsHUMAN_ 8-Jun-08 23:26

_AnsHUMAN_

8-Jun-08 23:26

Where do you initialize the variable obj? That kept aside you don't call out_func1 that is initializign the obj variable. Initialize and use the same variables.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: Problem with variables

Paresh Chitte8-Jun-08 23:27

Paresh Chitte

8-Jun-08 23:27

pl_kode wrote:
obj.path="c:\folder\file1.txt";

Use below code,

obj.path="c:\\folder\\file1.txt";

Regards,
Paresh.

Re: Problem with variables

David Crow9-Jun-08 7:08

David Crow

9-Jun-08 7:08

pl_kode wrote:
myfile.open (obj.path.c_str(), ios::app);

obj has not been initialized.

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Hi i am getting linker error LNK2001:unresolved external symbol

Member 46556858-Jun-08 22:49

Member 4655685

8-Jun-08 22:49

i created 3 property pages i am doing one of those 3 pages
i am getting like this
unresolved external symbol "public: static struct CRuntimeClass const CNSPropertyPage::classCNSPropertyPage" (?classCNSPropertyPage@CNSPropertyPage@@2UCRuntimeClass@@B)
followed by 30 LNK2001 errors

Re: Hi i am getting linker error LNK2001:unresolved external symbol

toxcct8-Jun-08 22:53

toxcct

8-Jun-08 22:53

forgetting to link some libs ?

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Re: Hi i am getting linker error LNK2001:unresolved external symbol

Member 46556858-Jun-08 23:05

Member 4655685

8-Jun-08 23:05

i checked but no libs missed

Re: Hi i am getting linker error LNK2001:unresolved external symbol

toxcct8-Jun-08 23:10

toxcct

8-Jun-08 23:10

how did you do that ?

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Re: Hi i am getting linker error LNK2001:unresolved external symbol

Member 46556858-Jun-08 23:20

Member 4655685

8-Jun-08 23:20

i created class CNSVirtualcircuitPath which is inherited from CNSPropertypage which is derived from CResizablePage

code i am writing for this page is already existing in my App i copied same code but this error is coming

Re: Hi i am getting linker error LNK2001:unresolved external symbol

Member 46556858-Jun-08 23:22

Member 4655685

8-Jun-08 23:22

and here i am giving some of examples
error LNK2001: unresolved external symbol "public: virtual bool __thiscall CNSPropertyPage::SkipFieldUpdate(class CString)" (?SkipFieldUpdate@CNSPropertyPage@@UAE_NVCString@@@Z)
NSPathInformationPage.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall CNSPropertyPage::InitializeTagMap(void)" (?InitializeTagMap@CNSPropertyPage@@UAEXXZ)
NSPathInformationPage.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall CNSPropertyPage::CreateTagMap(void)" (?CreateTagMap@CNSPropertyPage@@UAEXXZ)
NSPathInformationPage.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall CNSPropertyPage::GetEditableDependentsList(class std::list<struct NSObject::ObjectDependencyInfo const *,class std::allocator<struct NSObject::Obj
ectDependencyInfo const *> > &)" (?GetEditableDependentsList@CNSPropertyPage@@UAEXAAV?$list@PBUObjectDependencyInfo@NSObject@@V?$allocator@PBUObjectDependencyInfo@NSObject@@@std@@@std@@@Z)
NSPathInformationPage.obj :

Re: Hi i am getting linker error LNK2001:unresolved external symbol

Cedric Moonen8-Jun-08 23:46

Cedric Moonen

8-Jun-08 23:46

Did you add the .cpp file which contains the definition of CNSPropertyPage in your project ?

Cédric Moonen
Software developer

Charting control [v1.4]

Re: Hi i am getting linker error LNK2001:unresolved external symbol

Member 46556858-Jun-08 23:24

Member 4655685

8-Jun-08 23:24

Re: Hi i am getting linker error LNK2001:unresolved external symbol

Naveen8-Jun-08 23:17

Naveen

8-Jun-08 23:17

did u miss the IMPLEMENT_DYNCREATE() macro in the cpp file of the property page? Put the following code in your cpp file just after the #includes...

IMPLEMENT_DYNCREATE(CNSPropertyPage, CPropertyPage)

nave

[OpenedFileFinder]

Re: Hi i am getting linker error LNK2001:unresolved external symbol

Member 46556858-Jun-08 23:43

Member 4655685

8-Jun-08 23:43

i think that is not the problem i added correctly as

IMPLEMENT_DYNCREATE(CNSVirtualcircuitPath, CNSPropertyPage)

Re: Hi i am getting linker error LNK2001:unresolved external symbol[ Modified ]

Naveen8-Jun-08 23:45

Naveen

8-Jun-08 23:45

ok.

Have you added the file that contains the class CNSPropertyPage into the project? I mean, just take the file view tab and confirm that the cpp file is listed there.

nave

[OpenedFileFinder]

Re: Hi i am getting linker error LNK2001:unresolved external symbol[ Modified ]

Member 46556858-Jun-08 23:58

Member 4655685

8-Jun-08 23:58

i properly added that .h file in header file of CNSVirtualcircuitPath
but that file is in different DLL is there any communucation problem i am getting

Re: Hi i am getting linker error LNK2001:unresolved external symbol[ Modified ]

Graham Shanks9-Jun-08 0:10

Graham Shanks

9-Jun-08 0:10

If the body is in another DLL then you need to use dllexport and dllimport to tell the linker to put it into the DLL .lib file. Add the following code to your header file

#ifdef BUILDING_DLL/// export Dlls
#define SDK_EXPORT __declspec(dllexport)
#else
/// import Dlls
#define SDK_EXPORT __declspec(dllimport)
#endif

and then declare your class as follows:

class SDK_EXPORT CNSVirtualcircuitPath
{
  ...
}

Define BUILDING_DLL as a proprocessor define in the DLL project (and only in this project)

Graham

Librarians rule, Ook!

Re: Hi i am getting linker error LNK2001:unresolved external symbol[ Modified ]

Naveen9-Jun-08 0:13

Naveen

9-Jun-08 0:13

you mean the CNSPropertyPage is another dll? if so you definitly have to export the CNSPropertyPage class...

nave

[OpenedFileFinder]

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.