Re: sql - C / C++ / MFC Discussion Boards

alex.barylski15-Aug-02 16:09

15-Aug-02 16:09

I have a list box which I would like to include a CEdit control to alow easy editing of fields.

So far I have embeded(composition) a CEdit control in the CListBox class and have created it in PreSubclassWindow and made it invisible. When you double click on the item the CEdit becomes visible...and when you click else where its hidden... Easy...

However I need to capture WM_SETFOCUS && WM_KILLFOCUS && WM_KEYDOWN (Return key) of the CEdit control inorder to know when to copy the contents from the CEdit control to the list item currently indexed.

I have tried:
OnCommand
WndProc
OnParentNotify

I'm doing something wrong or this is not how this is accomplished...I thought I could subclass the CEdit control with a custom WndProc, but this would require a static or global function and I won't be able to call the GetText/SetText functions of my listbox...(It's actually a custom control i've designed from scratch, not a windows LISTBOX). Big Grin | :-D

Anyways...how would I go abouts acommplishing what I want...???

Thanx

Cheers Smile | :)

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Re: Listbox w/ CEdit embeded

Ernest Laurentin15-Aug-02 17:50

Ernest Laurentin

15-Aug-02 17:50

Use CListCtrl not CListBox, CListCtrl supports in place-editing: LVM_EDITLABEL style

VOTD: " Yet it was the Lord 's will to crush him and cause him to suffer, and though the Lord makes his life a guilt offering, he will see his offspring and prolong his days, and the will of the Lord will prosper in his hand. 11 After the suffering of his soul, he will see the light of life and be satisfied ; by his knowledge my righteous servant will justify many, and he will bear their iniquities." - Isa 53:10-11 (NIV)

MFC Controls

Anonymous15-Aug-02 13:49

Anonymous

15-Aug-02 13:49

Hello I have a problem, I created two dialogs and i want the second to appear whenever in the first a button is clicked, I know is very basic but I have searched for it and I cannot find any good example on it. I pressume is with new and ShowWindow() maybe?

Could anyone please explain?

Thank you for your time

Re: MFC Controls

Anonymous15-Aug-02 14:29

Anonymous

15-Aug-02 14:29

Try
Declaring an instance of the window
CDialogToOpen dlgDialogToOpen;

And then show the window
dlgDialogToOpen.DoModal();

In the buttons OnBnClicked Event

listsbox

danag15-Aug-02 12:10

danag

15-Aug-02 12:10

can someone tell me what functions I should write to implement drag and drop between 2 listboxes.
thanks

Re: listsbox

Steve L.15-Aug-02 15:50

Steve L.

15-Aug-02 15:50

Check out this article: http://www.codeproject.com/listctrl/dragtest.asp[^]

sql

danag15-Aug-02 11:52

danag

15-Aug-02 11:52

When ruuning my exe, i am getting a 'syntax error in my SQL statemnt'.
Here is the code form where the error is coming??

void CMgen1View::LoadListbox()
{

CMgen1Doc* pDoc = GetDocument();
CListBox* pLB = (CListBox*) GetDlgItem(IDC_LIST1);

CMgen1Set sect(&pDoc->m_database);

sect.m_strFilter = "InstructorID = '366'";

sect.Open(NULL,
_T( "Select * from Section WHERE sect.m_strFilter" ));

pLB->ResetContent();

while(!sect.IsEOF()) {
CString str;

str.Format(_T("%d %d"),sect.m_CourseID , sect.m_SectionNo);

pLB->AddString(str);

}
}

Re: sql

Bill Wilson15-Aug-02 12:00

Bill Wilson

15-Aug-02 12:00

The problem is in your sql statement

"Select * from Section WHERE sect.m_strFilter"

The SQL server doesn't know what sect.m_strFilter means.

Try Select * from Section WHERE InstructorID = '366'

Re: sql

Stefan Pedersen15-Aug-02 23:05

Stefan Pedersen

15-Aug-02 23:05

Replace

sect.Open(NULL,
_T( "Select * from Section WHERE sect.m_strFilter" ));

With

sect.Open(NULL,
_T(CString("Select * from Section WHERE ") + sect.m_strFilter ));

openGL and MFC

lucy15-Aug-02 11:43

lucy

15-Aug-02 11:43

I am studying OpenGL and all the sample code I found so far are writen using Win32 API. I tried to integrate openGL code to a MFC SDI application, but I am having trouble with OnSize. My code doesn't behave the same as the samples of Win32 API. Anybody can give me any hint? Or some sample code to refer to?

Thank you very much in advance!

Re: openGL and MFC

Mike Nordell15-Aug-02 18:33

Mike Nordell

15-Aug-02 18:33

Please do your own googling:

http://www.google.com/search?q=mfc+opengl+sample

Re: openGL and MFC

Ernest Laurentin15-Aug-02 19:05

Ernest Laurentin

15-Aug-02 19:05

Hi Lucy,
Look at NeHe Productions, you should find some cool stuff. Don't forget to bookmark it. Wink | ;)

Re: openGL and MFC

Roman Fadeyev15-Aug-02 23:32

Roman Fadeyev

15-Aug-02 23:32

void CChildFrame::OnSize(UINT nType, int cx, int cy) 
{
	CMDIChildWnd::OnSize(nType, cx, cy);
	
	wglMakeCurrent(GL->m_pDC->GetSafeHdc(), GL->hrc) ;	
	WWidth  = (GLint)cx;
	WHeight = (GLint)cy;
	::glViewport(0, 0, WWidth, WHeight);
	::glMatrixMode(GL_PROJECTION);
	::glLoadIdentity();
	::glMatrixMode(GL_MODELVIEW);
}

Re: openGL and MFC

lucy16-Aug-02 11:06

lucy

16-Aug-02 11:06

Thank you all very much. I found a sample, and I got one running in the dialog framework, which is good enough for the time being.

Again, many thanks!

Re: openGL and MFC

pankajdaga19-Aug-02 0:11

pankajdaga

19-Aug-02 0:11

Just a small question.

You mentioned that you found OpenGL tutorials that use Win32API. Can you point me to some good ones? You see, I do not like using MFC Smile | :)

Thanks,

Pankaj

Without struggle, there is no progress

INVALID_SET_FILE_POINTER isn't declared anywhere...

redeemer15-Aug-02 11:06

redeemer

15-Aug-02 11:06

When i try to compile a program, VirtualDub actually (www.virtualdub.com), it says that INVALID_SET_FILE_POINTER is an unknown identifier. Accoring to MSDN it's defined in winbase.h (include windows.h) but when i search for that phrase (INVALID_SET_FILE_POINTER) in my include folder, no results are found. Anyone know what could be wrong?

Thanks

Re: INVALID_SET_FILE_POINTER isn't declared anywhere...

Mukkie15-Aug-02 22:36

Mukkie

15-Aug-02 22:36

I have found it in winbase.h
#define INVALID_SET_FILE_POINTER ((DWORD)-1)
but only in sdk downloaded from Microsoft. This define does not exist (on my computer) in both VC6.0 and VC7.0 include/src folders.

Mukkie

memory leak if I do this?

ns15-Aug-02 10:31

15-Aug-02 10:31

In a function I have a local connection object declared as m_pConn1:

Ihad trouble working with a member variable so I made it local. The code works now but each time the function is called:

    _ConnectionPtr m_pConn1;
HRESULT hr = m_pConn1.CreateInstance (__uuidof (Connection));

if (FAILED (hr))
{
    AfxMessageBox ("Can't create intance of Connection");
}



if (FAILED (m_pConn1->Open (_bstr_t ("Provider=Microsoft.Jet.OLEDB.4.0;Data Source = "+PhotoDBName ),
            _bstr_t (""), _bstr_t (""), adModeUnknown)))
    {
    AfxMessageBox ("Can't open datasource");
    return 0 ;
    }

My hope is that the object gets destroyed when the function goes out of scope. Is thsi true or am I setting myself up for a massive memory leak?

I seem to remember something about this _ConnectionPtr being a smart pointer but maybe thats just wishful thinking. DOes anyone have any experience with this? Your suggestions are welcome. I'd not have done it this way but no other way seemed to work. I tried for two days and finally went this route.

Thanks,
ns

Re: memory leak if I do this?

Ranjan Banerji15-Aug-02 10:44

Ranjan Banerji

15-Aug-02 10:44

You will not have a memory leak. Hopefully not. Close the connection before you exit the function.

Why can't yo make that a member variable? What problems are you having?

Re: memory leak if I do this?

ns15-Aug-02 10:51

15-Aug-02 10:51

If I createInstance only once somewhere in an initialising event, and then in my function try to do m_pConn.Open, it throws an exception, but the errors collection is empty, plus its not a com error. SO at my wits end I tried this and it worked> technically my first try should work, but it would open the conn once successfully, then even if I closed it, it wouldnt open it a second time!

I have to be 100% sure about a potential leak here though. Makes me nervous.
Thanks for responding,
ns

Re: memory leak if I do this?

Jason Henderson15-Aug-02 11:24

Jason Henderson

15-Aug-02 11:24

If the CreateInstance was successful, Close the connection then Release m_pConn1.

Jason Henderson
_{quasi-homepage}
^articles
_{"Like it or not, I'm right!"}

Re: memory leak if I do this?

Tom Welch16-Aug-02 9:59

Tom Welch

16-Aug-02 9:59

This is a smart pointer, right? Doesn't calling release on a smart pointer crash the app?

Just wondering, 'cause I think I am right, but if I'm mistaken I need to be corrected.

Re: memory leak if I do this?

Jason Henderson16-Aug-02 10:36

Jason Henderson

16-Aug-02 10:36

No way! I call Release (mysmartp.Release()) all the time without crashes. All it seems to do is release the m_pInterface member and set it to null.

However, after looking at some MS examples, all they do is set the smart pointer equal to null.

What should actually be done here?

Jason Henderson
_{quasi-homepage}
^articles
_{"Like it or not, I'm right!"}

Re: memory leak if I do this?

Jo Fredrickson1-Jun-04 21:40

Jo Fredrickson

1-Jun-04 21:40

Can anyone answer Jason's question? I have found that when I call Release() my app crashes but I have huge memory leaks too?

What is the correct way to clean up the smart pointer?
Confused | :confused:

Re: memory leak if I do this?

Jason Henderson2-Jun-04 3:25

Jason Henderson

2-Jun-04 3:25

I still don't know for sure, but I think just setting it to NULL works.

"Live long and prosper." - Spock

Jason Henderson
blog

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