Create Combobox with ToolTips

Hi everyone,
I must create a Combobox having ToolTips. I saw this article http://www.codeguru.com/cpp/controls...icle.php/c4949 but it seems not working.
Tooltip text and its combo item must be different.

Someone could help me?

Thank you

What "seems not working"?

Quote:

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Originally Posted by VictorN

What "seems not working"?

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PreSubclassWindow() is not automatically called, for this reason m_lstCombo is not initialized and also CreateEx() has wrong arguments.

Also creating MyPreSubclassWindow() [equal to PreSubclassWindow()], my application crashes when I try to create m_lstCombo.

Quote:

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Originally Posted by symreds

PreSubclassWindow() is not automatically called, for this reason m_lstCombo is not initialized and also CreateEx() has wrong arguments.

Also creating MyPreSubclassWindow() [equal to PreSubclassWindow()], my application crashes when I try to create m_lstCombo.

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1. What type of application are you using (dialog, SDI, MDI, ...)?
2. How do you create this combobox: in a resource editor or dynamically using Create/CreateEx (if dynamically - show your code)
3. how did you implement the PreSubclassWindow call?
4. What is the exact error message for 'CreateEx() has wrong arguments" and how do you call this CreateEx?

1 Dialog called in a MDI application
2 Resource Editor
3 I've just created a method having the same code of PreSubclassWindow() and I've called it.
4 m_lstCombo.CreateEx( 0, WC_LISTVIEW, NULL, dwStyle, rc, this, 0 ); [from TooltipComboBox.cpp]
while
CListCtrl::CreateEx( In_ DWORD dwExStyle, _In_ DWORD dwStyle, _In_ const RECT& rect, In_ CWnd* pParentWnd, _In_ UINT nID); [from afxcmn.h]

Quote:

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Originally Posted by symreds

...
4 m_lstCombo.CreateEx( 0, WC_LISTVIEW, NULL, dwStyle, rc, this, 0 ); [from TooltipComboBox.cpp]
while
CListCtrl::CreateEx( In_ DWORD dwExStyle, _In_ DWORD dwStyle, _In_ const RECT& rect, In_ CWnd* pParentWnd, _In_ UINT nID); [from afxcmn.h]

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1. What does the list view control class WC_LISTVIEW have to do with the combobox? :confused:
2. You haven't answered my questions 3 and 4. If you are not going to show your actual code and error messages then don't expect any real help.
3. Please, use Code tags while posting code snippets.

1 I don't know, I only reported the call made in CTooltipComboBox class found at that link (that is different to CListCtrl::CreateEx).

2 I answered to your questions.
2.3) I created a dummy method equal to CTooltipComboBox::PreSubclassWindow(). It was just a way to force PreSubclassWindow, that is an "event method" that should be automatically called during CTooltipComboBox creation but it doesn't. Forget this part.
2.4) Error code is ...\tooltipcombobox.cpp(100): error C2660: 'CListCtrl::CreateEx' : function does not take 7 arguments. This is due to the fact that in that class CreateEx has 7 paramaters, while CListBox::CreateEx has 5 (as I shown).

3 Sorry, but I don't see a button to add code quotes. Is this syntax correct?: <Code> example </Code>

Quote:

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Originally Posted by symreds

...
2 I answered to your questions...

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You didn't.
I asked you to post your actual code (snippet), not a part of a line without any context.

Quote:

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Originally Posted by symreds

Error code is ...\tooltipcombobox.cpp(100): error C2660: 'CListCtrl::CreateEx' : function does not take 7 arguments. This is due to the fact that in that class CreateEx has 7 paramaters, while CListBox::CreateEx has 5 (as I shown).

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And how does this line 100 (and some others above and below it) look like? :confused:

Quote:

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Originally Posted by symreds

Sorry, but I don't see a button to add code quotes. Is this syntax correct?: <Code> example </Code>

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No, this syntax is wrong.
Please, read what you had to read before doing any post here: Announcement: Before you post....

Code:

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void CTooltipComboBox::PreSubclassWindow()
{
        CRect rc( 0, 0, 10, 10 );
        DWORD dwStyle =  WS_POPUP | WS_BORDER | LVS_REPORT | LVS_NOCOLUMNHEADER | LVS_SINGLESEL | LVS_OWNERDATA;
        m_lstCombo.CreateEx( 0, WC_LISTVIEW, NULL, dwStyle, rc, this, 0 ); // row 100, m_lstCombo is CTooltipListCtrl object, where class CTooltipListCtrl : public CListCtrl.
          DWORD dwStyleEx = m_lstCombo.GetExtendedStyle( );
        m_lstCombo.SetExtendedStyle( dwStyleEx | LVS_EX_FULLROWSELECT );
        m_lstCombo.Init( this );

        CRect rcAll;
        GetDroppedControlRect( &rcAll );
        GetWindowRect( &rc );
        SetDroppedWidth( rcAll.Width( ) );
        SetDroppedHeight( rcAll.Height( ) - rc.Height( ) );

        CComboBox::PreSubclassWindow( );

        EnableToolTips( );
}

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PreSubclassWindow() is not called => m_lstCombo is not initialized => calling CTooltipComboBox::SetItemTip() my application crashes

Code:

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int CTooltipComboBox::SetItemTip( int nRow, CString sTip )
{
        return m_lstCombo.SetItemTip( nRow, sTip );
}

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What is CTooltipComboBox? how is it declared?
What is m_lstCombo and which CreateEx method is used? Is it CTooltipListCtrl method? :confused:

In the first message of this thread I posted this link, telling that is not working: http://www.codeguru.com/cpp/controls...icle.php/c4949

at the end of the article there's a download part, where we can download CTooltipComboBox.cpp, CTooltipComboBox.h, CTooltipListCtrl.cpp and CTooltipListCtrl.h files.

I'm trying to use that two classes, but I have the problems I described.

I'm not going to download this code and then test it and compare with rgese couple of line you have posted.

It is very clear that if your code doesn't compile (as you stated in the post#7) it cannot run and therefore cannot produce any crash.
If it does compile then what does your post#7 mean? :confused:
If we ignored this post#7 and suggested that your code compiles and links but then

Quote:

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Originally Posted by symreds

PreSubclassWindow() is not automatically called

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then I'd say you implemented it wrong.

Besides:

Quote:

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Also creating MyPreSubclassWindow() [equal to PreSubclassWindow()], my application crashes when I try to create m_lstCombo.

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What is MyPreSubclassWindow? What does "[equal to PreSubclassWindow" mean in this context? How is this function called? :confused:
How exactly does your app "crash"?

The code we can download does not compile because m_lstCombo.CreateEx() has 7 parameters instead of 5. For this reason I changed the code in this way

Code:

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m_lstCombo.CreateEx( 0, dwStyle, rc, this, 0 );

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then in my program I declared the object in this way:

Code:

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CTooltipComboBox *pCombo = (CTooltipComboBox*)GetDlgItem(IDC_... ); // IDC_... resource ID of my combo

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when I do

Code:

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pCombo->SetItemTip(iCount, strTips);

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my application crashes. Call stack: m_lstCombo is not inizialized.

I searched where m_lstCombo should be created (CTooltipComboBox::PreSubclassWindow()) => put a breakpoint inside it => PreSubclassWindow() is never called.

I tryed to create a public method (CTooltipComboBox::MyPreSubclassWindow()) with the same code of PreSubclassWindow() and I called it after pCombo definition => application crashes in

Code:

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m_lstCombo.CreateEx( 0, dwStyle, rc, this, 0 );

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in particular it crashes here:

Code:

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BOOL CListCtrl::Create(DWORD dwStyle, const RECT& rect, CWnd* pParentWnd,
        UINT nID)
{
        // initialize common controls
        VERIFY(AfxDeferRegisterClass(AFX_WNDCOMMCTL_LISTVIEW_REG));

        CWnd* pWnd = this;
        return pWnd->Create(WC_LISTVIEW, NULL, dwStyle, rect, pParentWnd, nID); // here
}

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Remove your MyPreSubclassWindow.
Implement the virtual PreSubclassWindow but do it correctly! usually you should use ClassWizard (in VC6 or VS2010) or some similar tool in other IDEs

...but virtual PreSubclassWindow is already implemented in the code we download. I don't know how to do it "correctly".

Quote:

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Originally Posted by symreds

...but virtual PreSubclassWindow is already implemented in the code we download. ...

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Perhaps...
But you haven't shown yet how exactly it is declared/defined in *your* project ...

Quote:

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Originally Posted by symreds

...but virtual PreSubclassWindow is already implemented in the code we download. ...

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Perhaps...
But you haven't shown yet how exactly it is declared/defined in *your* project ...

Of course I cannot post my code here because my company has rights on it. Anyway the code is more or less this:

Code:

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CTooltipComboBox *pCombo = (CTooltipComboBox*)GetDlgItem( IDC_... ); // IDC_.... resource index of my combo
for( number of combo items )
{
    pCombo->AddString( combo item name );
    pCombo->SetItemTip( counter, tooltip text );
}

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Quote:

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Originally Posted by symreds

Of course I cannot post my code here because my company has rights on it. Anyway the code is more or less this:

Code:

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CTooltipComboBox *pCombo = (CTooltipComboBox*)GetDlgItem( IDC_... ); // IDC_.... resource index of my combo
for( number of combo items )
{
    pCombo->AddString( combo item name );
    pCombo->SetItemTip( counter, tooltip text );
}

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Are you kidding? :confused:
Where are the decaration/definition of PreSubclassWindow that "is not automatically called"?

Besides, why are you using GetDlgItem? didn't you implement the control member variable for your combobox? :confused:

Declaration/definition of PreSubclassWindow are in CTooltipComboBox.h/.cpp

Anyway, I've always used GetDlgItem instead of a control variable... I think it's the same...

Quote:

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Originally Posted by symreds

Anyway, I've always used GetDlgItem instead of a control variable... I think it's the same...

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I don't care what you have "lways used".
But my question is: do you only "think it's the same" or you are sure?
And how about the article you referred to:

Quote:

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To use this combo box, follow the following steps:

1. Include TooltipComboBox.h, TooltipComboBox.cpp, TooltipListCtrl.h and TooltipListCtrl.cpp in your project.
2. In the resource editor create a droplist combobox.
3. Create a control member variable for the combobox in VC's classwizard.
4. Include TooltipComboBox.h and replace CComboBox with CTooltipComboBox in your .h file. Also include afxtempl.h to support CMap.
5. To have your own tips, you can either use SetItemTip, SetComboTip functions, or replace GetItemTip function in CTooltipListCtrl, and GetComboTip function in CTooltipComboBox.

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Ok, I'm trying to create a control member variable...
I use VS2010 => Class View => I find my dialog class => right click => then? (is this the right procedure?)

MFC Class Wizard
Add Member Variable Wizard

Ok... got it, now the application doesn't crash anymore (and I hit the breakpoint inside PreSubclassWindow()!) but now AddStrings() is no more working: I created an empty combo... I'm going to investigate...

Quote:

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Originally Posted by symreds

... now AddStrings() is no more working: I created an empty combo...

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What is AddStrings() and how do you call it?

Sorry, typo error, I mean CComboBox::AddString() (without "s")

Quote:

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Originally Posted by symreds

Sorry, typo error, I mean CComboBox::AddString() (without "s")

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Well, how, when, and where from do you call it?

Post #18 (of course without initial GetDlgItem()...)

That code is into MyDialog::OnInitDialog()

Quote:

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Originally Posted by symreds

Post #18 (of course without initial GetDlgItem()...)

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Isn't copy/paste the actual code snippet easier for you than typing in this sentence? :confused:

Quote:

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Originally Posted by symreds

That code is into MyDialog::OnInitDialog()

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Well, it can be everywhere, but it doesn't help us to see it!