C / C++ / MFC

C^hris L^osinger27-Jul-01 5:53

C^hris L^osinger

27-Jul-01 5:53

you can only call non-static (ie. normal) methods on an object if you have an instance of the object.

so, either create an instance of class2 or find an already-exisiting instance of it.

-c

------------------------------
Smaller Animals Software, Inc.
http://www.smalleranimals.com

Matt Newman27-Jul-01 6:04

Matt Newman

27-Jul-01 6:04

you can only call non-static (ie. normal) methods on an object if you have an instance of the object. so, either create an instance of class2 or find an already-exisiting instance of it.
I am a beginner and I am not sure what you mean by create an instance. Could you elucidate this for me?

-Matt Newman Suspicious | :suss:

C^hris L^osinger27-Jul-01 7:05

C^hris L^osinger

27-Jul-01 7:05

This is really one of the basic principles (maybe the most basic principle) in all of Object Oriented programming: you have a set of functions and properties grouped together that comprise an "object". You can tell the object to do something (invoke methods on the object), to report its state, to change its state, etc..

CString myString;

After this statement executes, "myString" is an "instance" of CString. Or, you could say "myString is an object of type CString".

Now you can call CString methods on myString:

BOOL b = myString.IsEmpty();
myString.MakeUpper();

etc..

What you can't do is call (non static) CString methods without having a CString object to call them on:

CString::Reverse();

This statement makes no sense (at all).What are you trying to Reverse? There is no object there. It's a verb without a noun.

-c

------------------------------
Smaller Animals Software, Inc.
http://www.smalleranimals.com

PLEASE HELP !!!! URGENT !!!!!!!!!! save struct in file

Matt Newman27-Jul-01 8:23

Matt Newman

27-Jul-01 8:23

Now I remember. Thanks for the help and the refresher course.;)

-Matt Newman Suspicious | :suss:

27-Jul-01 5:09

This code doing problems in run time, When it read from the file this gets incorrect values in the parameters of the struct. Please ! try find the problem !!!!!!!
class CPerson {
CPerson();

public:
virtual ~CPerson();

public:
dPerson per;
CPerson* pNext;
CPerson* pBack;
};
-------------------------------------------------------------
________________________________________________________________
//cpp file:
-----------------

void CDemo::OnButtonAdd()
{
CFile file;
// CFileException ex;

if(file.Open(strPath, file.modeWrite |file.modeNoTruncate|file.modeCreate ))
{
file.SeekToEnd();
file.Write( &(person.per) , sizeof(dPerson));
MessageBox("************ S A V E D ************** ");
}
}

/************************************************************/
// Read the one first CPerson from the file:
void CDemo::read_person(CFile* persons)
{
CPerson* q = new CPerson;

DWORD dwRead = sizeof(dPerson);

if((*persons).Read(&q->per, sizeof(dPerson)))
{
q->pNext = q->pBack = NULL;
p_head = p_tail = q; //p_head and p_tail are member variables of CDemo - type CPerson*
}
else delete q;
}

/************************************************************/
Cry | :((

Re: PLEASE HELP !!!! URGENT !!!!!!!!!! save struct in file

Joaquín M López Muñoz27-Jul-01 5:37

Joaquín M López Muñoz

27-Jul-01 5:37

Have you tried to add the flag CFile::typeBinary when opening the files?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

problem with SetActiveView( , ),,??????

mr200327-Jul-01 4:40

27-Jul-01 4:40

Hi,,
I have a MDI application. I like to get a pointer to the view of a particular document, and them activate it,,

this is the way that I do it,, but it doesn't work

pDoc= GetDocument();
POSITION pos = pDoc->GetFirstViewPosition();
while (pos != NULL)
{
pView = pCurrDoc->GetNextView(pos);
pCurrView=(CTurboMechView*)pView;
CMDIFrameWnd *pFrame = (CMDIFrameWnd*)AfxGetApp()->m_pMainWnd;
pFrame->SetActiveView(pCurrView,TRUE);
}

Thanks
Confused | :confused:

Ehsan Behboudi

Tomasz Sowinski27-Jul-01 4:50

Tomasz Sowinski

27-Jul-01 4:50

I think that you should activate a frame, not a view - this is MDI app, right? Do you have multiple views in one MDI child frame?

Tomasz Sowinski -- http://www.shooltz.com

mr200327-Jul-01 6:06

27-Jul-01 6:06

i dont' have multiple views in one MDI child frame.
but i have several documents open...
so I like to be able to activate a particular View..
I can get a pointer to the document. and then i can get a pointer to the View of that documents. but i can't activate the view..

any ideas??

Ehsan Behboudi

Matt Gullett27-Jul-01 6:14

Matt Gullett

27-Jul-01 6:14

Assuming you have the document pointer

POSITION ViewPos = pDoc->GetFirstViewPosition();
ASSERT(ViewPos);
CView* pView = pDoc->GetNextView(ViewPos);
ASSERT(pView);
pView->GetParentFrame()->BringWindowToTop();

mr200327-Jul-01 8:34

Background color of CListCtrl

27-Jul-01 8:34

thank you
it was helpful

Ehsan Behboudi

Adding A Interface

AJ12327-Jul-01 4:37

AJ123

27-Jul-01 4:37

Hi,

I am modifying a DCOM sever, i have written some new functions and would like to package them into their own interface. How do i do this, a sample piece of IDL is shown for one of the interfaces that already exists on the object. Is there anything i need to watch out for? where do i get the uuid from

[

uuid(5E816CCA-628A-4959-B1FE-05465C3393EB),

helpstring("IDocumentVision Interface"),
pointer_default(unique)
]

interface IDocumentVision : IUnknown
{
}

Cheers

Rich

Re: Adding A Interface

Not Active27-Jul-01 8:18

Not Active

27-Jul-01 8:18

You can get the uuid from GUIDGen.exe, should be in the tools folder in your Visual Studio installation. I always add it to the tools menu for easy access.

VC Pre-Build Commands

Steve Thresher27-Jul-01 4:10

Steve Thresher

27-Jul-01 4:10

If I use a prebuild command to auto-generate a source file, can I then add that source file to the current project?

System DSNs

27-Jul-01 4:07

Hi there,

I was wondering if there is anyway to detect what system DSNs are currently configured on a given machine within a Windows Application?

thanks Cry | :((

Re: System DSNs

Not Active27-Jul-01 8:23

Not Active

27-Jul-01 8:23

Look under this reg key: HKEY_LOCAL_MACHINE\SOFTWARE\ODBC\ODBC.INI

skfnmuislædmufaæoi27-Jul-01 4:03

skfnmuislædmufaæoi

27-Jul-01 4:03

I'm using a CListView-derieved class which displays SQL-results in report style.
I decided to turn the background gray, so I called SetBkColor() in OnInitialUpdate. The problem is, that this backgroundcolor can only be seen in areas, where no items are draw and as a flickering background when scrolling the list. Confused | :confused:

What must be done to override the standard item background color?

Pseudocode is code to demonstrate a concept, not designed to be run.
Like certain Microsoft software.

Re: Background color of CListCtrl

Tomasz Sowinski27-Jul-01 4:39

Tomasz Sowinski

27-Jul-01 4:39

The message to handle is WM_ERASEBKGND.

Tomasz Sowinski -- http://www.shooltz.com

Re: Background color of CListCtrl

skfnmuislædmufaæoi29-Jul-01 2:38

skfnmuislædmufaæoi

29-Jul-01 2:38

Sorry, but it doesn't help me.
On handling this message, i can decide to paint or not paint the background.
This is well doing, and my desired black background is already painting but not at the items background. That is my problem. The areas, where no item is 'overpainting' are black.

Any idea?

--------------------------------------------------
"Pseudocode is code to demonstrate a concept, not designed to be run.
Like certain Microsoft software. "

Re: Background color of CListCtrl

Tomasz Sowinski29-Jul-01 23:12

Tomasz Sowinski

29-Jul-01 23:12

Use identical color with LVM_SETBKCOLOR and LVM_SETTEXTBKCOLOR (or CListCtrl::SetBkColor/SetTextBkColor if you're using MFC):

CListCtrl &lst = ...;
lst.SetBkColor(RGB(255, 0, 0));
lst.SetTextBkColor(RGB(255, 0, 0));

This should make all background red.

Tomasz Sowinski -- http://www.shooltz.com

How to gradation with RGBcolor?

jin sok cho27-Jul-01 4:01

jin sok cho

27-Jul-01 4:01

Attention please~~~

Hi~

I'm a University student preparing a graduation thesis, in Korea.

But in the process, there raised an obstacle, so I'm in stuck with a problem.

So now I sincerely call for your help...

As the question contains some images and source file, I make out html document file.

The address is http://my.netian.com/~sibuzigi/forsite.htm

I hope your quick and adequate answer.

p/s Please~~~ Somebody help me~~~!^^;;;;;;

Confused | :confused:

Re: How to gradation with RGBcolor?

mr200327-Jul-01 4:46