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What type is the main window now?
acerunner316 wrote: But none of the controls from the first tab works properly. Debugger says access violation.
These two are maybe related? Where does the exception occur? If it's MFC can you trace the stack
back into your code?
Without seeing the code for how you create the two dialogs and how you handle placing them in the
tabs it's tough to guess 
Mark
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The main window is a CDialog, and so are the two child tab windows. All generated in resource editor.
I've removed theOnSysCommand, OnPaint, and OnQueryDragIcon from the original main window, and added into the new main window. OnInitDialog stayed but I removed the part that generates the about box. Not sure what to do about OnCancel, OnDestroy, and PostNcDestroy, so I left it as it is. To create the tabs I basically followed this example exactly (http://www.codersource.net/mfc_ctabctrl.html).
The error is "Unhandled exception in [myappname].exe (NTDLL.DLL): 0xC0000005: Access Violation."
Thanks.
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acerunner316 wrote: The error is "Unhandled exception in [myappname].exe (NTDLL.DLL): 0xC0000005: Access Violation."
Right, but where? If it's not stopped on a line of your code can you view the stack trace and
find the last line of your code that executed before the exception?
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Ok, I fixed the problem. For some reason, a clean and a rebuild fixed the problem.
But now another minor problem has arisen. I have a small popup loading dialog window that should be popping up centered relative to the main dialog window. (If you recall, you helped me with that in another forum thread.) Now with the tab, the popup window is created in the upper left corner of the tab window.
Here is how it is created.
EnableWindow(FALSE);<br />
pLoadingDlg = new CLoading;<br />
pLoadingDlg->Create(IDD_LOADING, this);
pLoadingDlg->ShowWindow(SW_SHOW);
I tried using this to move it.
CRect MainDialogRect, LoadDialogRect;<br />
GetClientRect(&MainDialogRect);<br />
pLoadingDlg->GetWindowRect(&LoadDialogRect);<br />
pLoadingDlg->MoveWindow((MainDialogRect.Width() - LoadDialogRect.Width()) / 2, <br />
(MainDialogRect.Height() - LoadDialogRect.Height()) / 2, <br />
LoadDialogRect.Width(), LoadDialogRect.Height());
But it just places the window at the correct location, but relative to the screen, and not to the main window.
Also the EnableWindow(FALSE); no longer works. Is it safe to use GetParent()->EnableWindow(FALSE);?
-- modified at 16:02 Wednesday 20th December, 2006
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What class is this called from (which window)?
EnableWindow(FALSE);
pLoadingDlg = new CLoading;
pLoadingDlg->Create(IDD_LOADING, this); //"this" or "GetParent()"
pLoadingDlg->ShowWindow(SW_SHOW);
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it is called from what is now a child tab window. The code worked fine as the main dialog window until i started using tabs.
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Does this work?
CRect MainDialogRect, LoadDialogRect;
GetParent()->GetClientRect(&MainDialogRect);
pLoadingDlg->GetWindowRect(&LoadDialogRect);
pLoadingDlg->MoveWindow((MainDialogRect.Width() - LoadDialogRect.Width()) / 2,
(MainDialogRect.Height() - LoadDialogRect.Height()) / 2,
LoadDialogRect.Width(), LoadDialogRect.Height());
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Argg sorry - try this
CRect MainDialogRect, LoadDialogRect;
GetWindowRect(&MainDialogRect);
::MapWindowPoints(0, *this, (LPPOINT)&MainDialogRect, 2);
pLoadingDlg->GetWindowRect(&LoadDialogRect);
pLoadingDlg->MoveWindow((MainDialogRect.Width() - LoadDialogRect.Width()) / 2,
(MainDialogRect.Height() - LoadDialogRect.Height()) / 2,
LoadDialogRect.Width(), LoadDialogRect.Height());
Tab control doesn't really have a useful client rect so I've taken it's window rect (relative to
the screen) and mapped it to be relative to itself.
I think that will work...
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Now that I think about it more, the MapWindowPoints() isn't necessary since you only need
the size of the tabs control, not it's position. You can probably eliminate that call.
The important part is using GetWindowRect instead of GetClientRect.
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I still get the same result with that code. But that gave me an idea. Here's what I did to fix it.
CRect MainDialogRect, LoadDialogRect;
GetParent()->GetWindowRect(&MainDialogRect);
pLoadingDlg->GetWindowRect(&LoadDialogRect);
pLoadingDlg->MoveWindow(MainDialogRect.left + ((MainDialogRect.Width() - LoadDialogRect.Width()) / 2),
MainDialogRect.top + ((MainDialogRect.Height() - LoadDialogRect.Height()) / 2),
LoadDialogRect.Width(), LoadDialogRect.Height());
I found that I was always getting the correct coordinates, just relative to the wrong point (screen origin vs window origin). So I added the location of the main window to the coordinates.
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Whatever works. Seems weird (obviously, or you would't have asked about it in the first
place) that you'd get screen-relative coordinates from GetClientRect()...
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Yeah that IS very unusual. Maybe something to do with the fact that it's a tab window. Who knows what actually goes on in the GetClientRect() function. Maybe you do, but I sure don't. You are clearly much more experienced in VC++ than me.
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acerunner316 wrote: Maybe you do, but I sure don't.
Not me.
I dug in my existing code and saw I was mapping the window rect points like that second code
I posted (in my case I handle the tab control and all the associated tab windows from the tab's
parent window class so it's a little different).
Regardless, the MoveWindow call should move the child window relative to it's parent's client area.
 Beats me!
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Another question, since the two tabs does very similar tasks and functions, is it possible to use the same dialog class for both tabs, but different resource dialog (ie IDD_TAB1 and IDD_TAB2 both associated with CTabDlg)? The layout will be different, but I will be reusing most of the same functions.
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Yes it's possible. You'll need to create with the appropriate resource ID.
You can also use a common base class containing the code for the controls they have in common
and derive 2 classes, each with whatever code they need for the unique parts of the dialogs.
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When I create a new dialog in resource editor and I use class wizard to assign an existing class to it, I get a warning that the dialog class definition is already using another resource. It asks if I want to change it to the new resource, but I don't want to change it, I want it to use both resource...
Is this the correct way to do it?
The 2 derived classes sounds like the best solution. I would have to remap all the controls from the existing tab window though. It will take longer, but I think in the long run, this is the better option.
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acerunner316 wrote: Is this the correct way to do it?
Yeah I didn't think about how the class wizard would react I guess some hand-coding/rearranging
will be necessary.
acerunner316 wrote: I would have to remap all the controls from the existing tab window though
If you choose to go that route, use the class with the most code already in it. Copy the
cpp and h files and rename to the base class name or whatever. In the files find/replace all
instances of the old class name with the new name.
That'll save much work.
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The class wizard doesn't seem to allow creating a derived class from a derived class. In the Add New Class dialog box, there is no selection for user defined classes, just the standard Windows classes.
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That has to be changed by hand as far as I know. I usually derive from the known (by the class
wizard) class (CDialog) and then change all the CDialog to CMyDialog. This is way easier after
all the controls and control message handlers have been added using the wizard.
Later, if controls are added or removed I just do it by hand, since there's already code there
to copy from.
It's a fact of life with an advanced UI layout
Someday the wizards will learn from the way we do things and adapt....I hope!
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Hello,
I am having real trouble figuring out how to use CInternetSession, CHttpFile, and the like to interact with web servers and download content.
Is there anyone here with experience using these classes?
Specific Questions:
Am I supposed to use either OpenURL OR create a CHttpConnection, but not both?
Am I supposed to first call CHttpFile::SendRequest() and then wait for it to call my StatusCallback function, then start reading from the CHttpFile?
Why does the CHttpFile not show any response even though the callback function says that a response has been received?
--------------------------------
"All that is necessary for the forces of evil to win in the world is for enough good men to do nothing" -- Edmund Burke
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Richie308 wrote: Has anyone used the MFC Internet Classes?
No. No one has ever used them.
Richie308 wrote: I am having real trouble figuring out how to use CInternetSession, CHttpFile, and the like to interact with web servers and download content.
You mean like in the instructions that they hid in the documentation[^]?  
led mike
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Your post is not helpful. Better to say nothing than say garbage like that.
The documentation is obviously not answering my questions. If you have something to contribute, then do so.
--------------------------------
"All that is necessary for the forces of evil to win in the world is for enough good men to do nothing" -- Edmund Burke
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Well I wouldn't want you to have to read any documentation so here use this article [^]and you can just copy paste your code.
led mike
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That's fine for synchronous use of the classes, but I'm trying to use them asynchronously.
--------------------------------
"All that is necessary for the forces of evil to win in the world is for enough good men to do nothing" -- Edmund Burke
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Richie308 wrote: I'm trying to use them asynchronously
Can you do that with the MFC WinInet classes (well, aside from using a separate thread)?
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