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Initializing a CProgressCtrl Object Inside CDialog :: MFC

Started by kuphryn Apr 15, 2002 at 8:41 PM 3 replies 3.6k views

Original Post

Apr 15, 2002 at 8:41 PM

Hi. I have a CDialog (modal) object. It serves as a progress dialog similar to the one that you see while waiting for EI to finish downloading. Inside the actual dialogbox is a CProgressCtrl object. Right now, the progress bar does not do anything. I tried initializing it like this: m_MyProgressBar.SetRange(0, 100); m_MyProgressBar.SetPos(0); The program crashed when I add the code above. I did *not* create the object. The reason is I did not know the size of the object. For example, this code comes from Prosise''s book: m_MyProgressBar.Create(WS_CHILD | WS_VISIBLE, rect, this, -); I added a progressbar via Dialogbox Editor. I need to create the progressbar, but I do not know the actual rectangle of the progressbar I made using Dialogbox Editor. How you to initialize a progressbar made using Dialog Editor? Thanks, Kuphryn

Ehamliptoran

Apr 16, 2002 at 6:20 AM

goto View->Classwizard...

under classwizard click on the tab labeled

Select ur progress bar, defaultly named IDC_PROGRESS#

# - being a number

click the add variable button to the right of the form, and choose an appropriate name, m_MyProgressBar - is a good one

and click okay, and there u have it, u just initialized a progress bar, voila it should hopefully work

The worst way to miss someone is to be sitting next to them, knowing you cant have them

Stoffel

Apr 16, 2002 at 9:27 AM

Also, you can''t manipulate that object until _after_ CDialog::OnInitDialog () has been called--it doesn''t exist until then.

kuphryn

Apr 16, 2002 at 9:52 AM

Thanks.

Here is something I learned and have implemented. Prosise described a good way to enable/disable a control (i.e. button) inside a dialog box. Here is the technique.

CWnd *pWnd = GetDlgItem(IDOK); // item you want to control
pWnd->EnableWindow(FALSE); // this will disable the control
pWnd->EnableWindow(TRUE); // this will enable the control

As for updating the progress bar inside a dialog box, I thought about sending CMainFrm a message which then gets redirected to CChildView. CChildView will then pass a new position to a function in CDialog. I would have to declare the CDialogBox as private in CChildView instead of local in a function. What do you think?

Kuphryn

[edited by - kuphryn on April 16, 2002 10:56:04 AM]

kuphryn

Apr 16, 2002 at 5:43 PM

Conventionally speaking, should the dialogbox (progressbar) comes first or the access data processing. In other words, when creating a progressbar inside a dialog box, should I begin data manipulation, which is what the dialog box will ultimately depend on to update the progressbar, *before* creating the dialog box or *after*? Either way, it looks like I will need to seen a message to the MainFrm or view after InitDialog() in the dialog box.

Kuphryn

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