C / C++ / MFC

Re: create/control dynamic combo box

18-May-04 7:06

If you set the categorey to control, you don't need the control pointer

instead you would

m_ctrlCombo.AddString("");

However, if your categorey was set to value because your relying on MFC's DDX and Updatedata() then keep it that way...so your combo is updated automagically...by the framework...

You will need a pointer if you want to add items dynamically...using AddString()...becuase value will store a member variable of type CString(I think) not CComboBox you can't call the string with a function like AddString...

Cheers Smile | :)

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elephantstar18-May-04 10:53

elephantstar

18-May-04 10:53

Thanks Hockey! It worked!!!

Waring 4530

monrobot1317-May-04 13:47

17-May-04 13:47

In the class I'm writing I'm using the string type from the STL. The problem I'm encoutering is that when I compile I'm getting warning 4530 in a bunch of the STL string files. The warning is "C++ exception handler used, but unwind semantics are not enabled. Specify -GX" I see that I can just add the -GX compiler option, but I want to know why I'm getting this warning. I've used string before and never had this problem. In my header I have

#include <string>
using namespace std;

Am I doing something wrong here?

- Aaron

alex.barylski17-May-04 14:39

17-May-04 14:39

MSDN states you need to enable exception handling for any of the standard C++ library.

http://support.microsoft.com/default.aspx?scid=kb;en-us;q154419[^]

Why you didn't get this warning before??? Maybe you weren't using MS STL Confused | :confused:

Or perhaps your proejct settings already included this compiler switch?

Check out #pragma warning to surpress this warning

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monrobot1317-May-04 16:29

17-May-04 16:29

Thanks for the info. Not sure why I never got the warnings before but I guess I'll enable the exception handling and clear those pesky warnings.

I was going to use #pragma warning but I'd actually have to put it in each file that was causing the warning...probably not a good idea.

- Aaron

alex.barylski17-May-04 18:53

17-May-04 18:53

Cheers

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Mike Dimmick18-May-04 2:59

Mike Dimmick

18-May-04 2:59

Some project types, e.g. MFC projects, have /GX (/EHsc) enabled by the AppWizard. Others don't.

Stability. What an interesting concept. -- Chris Maunder

monrobot1318-May-04 5:23

Is it Modeless or Modal dialog. I'm confused

18-May-04 5:23

That would be why then, the project wasn't an MFC one. Thanks for the info.

- Aaron

robert_s17-May-04 13:27

robert_s

17-May-04 13:27

Hi
As far as I know there are two types of dialogs. Modeless and Modal.

Now according what it says here : [url]http://www.devarticles.com/c/a/Cplusplus/Using-MFC-in-Cplus-Dialog-Boxes/4/[/url] and also on Microsft's MSDN site that to create Modeless dialog I must call Create() function and DestroyWindow() function. Whereas for the modal dialog I only call DoModal.

Now I am confused as my dialog does not call any of those functions and I am still able to display it.

The dialog initialization is:
BOOL CProgressDlg::OnInitDialog()
{
CDialog::OnInitDialog();
ShowWindow(SW_HIDE); // Show or hide a control, etc.
return TRUE;
}

and to display I call ShowWindow(SW_SHOW);

and Close() function to close dialog:

void CProgressDlg::Close()
{
EndDialog(IDOK);
}

It works.! So what kind of dialog is this? I guess this is a modeless dialog as it doesnt need to wait untill the user presses OK button. Is it correct what I am doing here or its wrong? Please let me know.

My second question: The dialog I created is used to display a progress bar while some text files are processed using a separate worker thread (thread used purely for files processing not for the dialog). The problem I have is when I start processing files the dialog with the progress bar appears but its behind the main window. How can I force it to display over the main window as the modal dialogs do? I guess WS_OVERLAPPED will do but where to use it?

Re: Is it Modeless or Modal dialog. I'm confused

alex.barylski17-May-04 13:42

17-May-04 13:42

How are you creating your dialog object?

Modal's are (usually) created on the stack (or heap):

CMyDialog myDlg;
myDlg.DoModal() // Display a modal dialog

When it goes out of scope, everything is cleaned up automagically...(if created on the stack)

robert_s wrote:
Now I am confused as my dialog does not call any of those functions and I am still able to display it.

Now I am confused...how are you creating a dialog if your no calling Create or DoModal??? Confused | :confused:

robert_s wrote:
My second question: The dialog I created is used to display a progress bar while some text files are processed using a separate worker thread (thread used purely for files processing not for the dialog). The problem I have is when I start processing files the dialog with the progress bar appears but its behind the main window. How can I force it to display over the main window as the modal dialogs do? I guess WS_OVERLAPPED will do but where to use it?

SetForegroundWindow()???

How do I print my voice mail?

Combo Box and Edit Box

Eversman17-May-04 13:10

17-May-04 13:10

Hey,

I am using Visual C++, and I created a Combo Box and added the options into it. Now, when someone selects one of the options, I want a text describing the option to appear in an edit box. I have looked around and only found a few things, but nothing really helped.

Thanks for the help

alex.barylski17-May-04 13:32

17-May-04 13:32

The combox by default displays the text in the list control in the edit box as each item is selected.

I'm not sure, but you could maybe try capturing ON_CBN_EDITUPDATE or ON_CBN_SELCHANGE and then forcing the edit to change it's value.

This approach won't work if the drop down list and edit field are dual synchronized. What I mean by this is if you set the edit content it make force a new item to be selected inside the list box as well and visa-versa.

If this is the case you will have to subclass the CComboBox control and override this functionality.

Cheers Smile | :)

How do I print my voice mail?

Eversman17-May-04 13:38

17-May-04 13:38

I tried doing that, didn't work, here is my code.

<br />
void CDEPDlg::OnSelchangeCombo1() <br />
{<br />
	// TODO: Add your control notification handler code here<br />
	UpdateData(true);<br />
<br />
	if(m_type1=="Run #1")<br />
	{<br />
		m_purp1="Test";<br />
	}<br />
<br />
	UpdateData(false);<br />
<br />
}<br />

m_type1 is the combo box, and Run #1 is the option in the combo box.
m_purp1 is the edit box that i want it to display the description.

I know it is wrong, so criticize all you want, just need help with it.

Thanks

alex.barylski17-May-04 13:46

17-May-04 13:46

It's been a while since I subclassed comboboxes or dealt with them for that matter Smile | :)

How did you get m_purp1and m_type1 to map to the 2 controls that make up an CComboBox?

How do I print my voice mail?

Eversman17-May-04 13:52

17-May-04 13:52

I went to the class wizard and did it there.

m_type1 is a CString and m_purp1 is a CString also

monrobot1317-May-04 13:52

17-May-04 13:52

If you're wanting to update an Edit Box that isn't the one at the top of the Combo Box (which is what it looks like) try this

void CDEPDlg::OnSelchangeCombo1() 
{
CString text;
m_type1.GetWindowText (&text);
if(text == "Run #1")
    m_purp1.SetWindowText("Test");

}

- Aaron

Eversman17-May-04 13:59

17-May-04 13:59

Thanks for the help.

I am getting this error,

C:\DEP\DEPDlg.cpp(182) : error C2664: 'void __thiscall CWnd::GetWindowTextA(class CString &) const' : cannot convert parameter 1 from 'class CString *' to 'class CString &'
A reference that is not to 'const' cannot be bound to a non-lvalue

Eversman17-May-04 14:01

17-May-04 14:01

I took out the & in the (&text) and it worked, and it works, but i have to select the Run #1 twice for the Test to show up in the edit box.

Thanks

monrobot1317-May-04 14:32

17-May-04 14:32

but i have to select the Run #1 twice for the Test to show up in the edit box

Try chaging your message from CBN_SELCHANGE to CBN_SELENDOK. I think the reason you're having to select it twice is that CBN_SELCHANGE is sent before the selection changes, therefore the text, "Run #1" in your case, isn't actually in the edit portion when the message is processed. CBN_SELENDOK is sent after the selection is made. Just use class wizard to remove the selchange and add a selend

- Aaron

- Aaron

Eversman17-May-04 14:36

17-May-04 14:36

Thanks for your help.

I tried that and I still have to do it twice to get it to show up. Any more ideas?

monrobot1317-May-04 16:18

17-May-04 16:18

Figured that would work, guess not though. Try this

int cur = m_type1.GetCurSel ();
CString text;
m_type1.GetLBText (cur, text);
if (text == "Run #1")
	m_purp1.SetWindowText ("Test");

- Aaron

Eversman17-May-04 16:22