C / C++ / MFC Discussion Boards

Re: get pointer on member function

Ken Mazaika31-Jul-03 6:35

Ken Mazaika

31-Jul-03 6:35

This page[^] might help you out.

Re: get pointer on member function

Alexander ^M.,31-Jul-03 10:35

Alexander ^M.,

31-Jul-03 10:35

lol, what joky answers here... Cool | :cool:

define the member function static and there shouldn't be a problem anymore

Don't try it, just do it! Wink | ;-)

Re: get pointer on member function

Mike Dimmick31-Jul-03 23:48

Mike Dimmick

31-Jul-03 23:48

I think we were all assuming that the original poster needed the function to be a member function ('instance method' in C# terminology).

A static member function has no this pointer, of course.

OK, you can do hacks like passing a pointer to the object into the static member function as a parameter, but that doesn't really gain you anything. I only ever do this when creating a thread or writing a callback function for interfacing with a C API - this type of function usually gives you a void* or LPARAM parameter which you can pass arbitrary data in, which gets passed to your thread entry point or callback function.

Check existance of directory

BoudewijnEctor31-Jul-03 3:59

BoudewijnEctor

31-Jul-03 3:59

Does anyone have the MFC equivalent of

directory.exists()?

Re: Check existance of directory

Brian Shifrin31-Jul-03 4:03

Brian Shifrin

31-Jul-03 4:03

How about GetFileAttributes(file)
and check for FILE_ATTRIBUTE_DIRECTORY ?

Re: Check existance of directory

valikac31-Jul-03 6:10

valikac

31-Jul-03 6:10

One solution is FindFirstFile() and FindNextFile().

Kuphryn

Re: Check existance of directory

Joel Lucsy31-Jul-03 7:31

Joel Lucsy

31-Jul-03 7:31

Or how about CFile::GetStatus

Joel Lucsy

Re: Check existance of directory

Toni7831-Jul-03 18:55

Toni78

31-Jul-03 18:55

Or you could use SetCurrentDirectory(). If the function returns FALSE then the directory doesn't exist. You should also call GetLastError() and make sure that it returns ERROR_PATH_NOT_FOUND (I am not sure if that's the actual error but you can figure that out), because there could be several reasons why SetCurrentDirectory() might return FALSE. (make sure you save the current directory before calling the function, in case the directory you are seaching for exists).

// Afterall, I realized that even my comment lines have bugs

When one cannot invent, one must at least improve (in bed).-My latest fortune cookie

Re: Check existance of directory

HPSI31-Jul-03 20:14

HPSI

31-Jul-03 20:14

Of course there is the venerable

if (_access(strDir, 0) == 0)
{
    TRACE("exists\n");
}

HPS HwndSpy - GUI developer's aid to visually
locate and inspect windows. For the month of August
only, use coupon code CP-81239 for 30% off.

Under what circumstances does IE run in explorer.exe process?

Tommy Svensson31-Jul-03 3:57

Tommy Svensson

31-Jul-03 3:57

Hi,

Appreciate your help on this one...

Under what circumstances does IE run in the explorer.exe process?

Thx,

/Tommy

Re: Under what circumstances does IE run in explorer.exe process?

Mike Dimmick31-Jul-03 4:56

Mike Dimmick

31-Jul-03 4:56

In new versions of Windows, whenever you type a web URL into the Address combo, or select a web resource from the Favorites menu.

What is commonly thought of as 'IE' is really an ActiveX control that you can load into any frame. Explorer.exe and IExplore.exe really just control what gets loaded into the frame when it's first created - either an Explorer-style ListView or a WebBrowser control. It's been like this since IE 4.0 and the Desktop Update (Active Desktop).

If you type a local address (e.g. C:\Work) into an IE window, it'll turn into an Explorer.

The only thing that Explorer.exe does which IExplore.exe doesn't is to run your desktop and taskbar.

Downloading a new version of 'Internet Explorer' basically updates most of how the shell works.

Re: Under what circumstances does IE run in explorer.exe process?

Tommy Svensson31-Jul-03 5:04

Tommy Svensson

31-Jul-03 5:04

Thx Mike!

My problem is this:

I have a BHO which is only supposed to load and run in
Internet Explorer; the BHO is a web tool. It has a heavy init phase which is
very annoying having to wait for if it's loaded in explorer.exe (that is in folders and such frequently used objects), the way it is now.

Is there a way to know under what circumstances IE is run under the explorer.exe process so that I can skip the heavy loading in these cases...? Because when I had this piece of code

if (dwReason == DLL_PROCESS_ATTACH)
{
TCHAR pszLoader[MAX_PATH];
GetModuleFileName(NULL, pszLoader, MAX_PATH);
_tcslwr(pszLoader);
if (_tcsstr(pszLoader, _T("explorer.exe")))
return FALSE;
}

my BHO did not load at all in IE on some machines... which ones with what spec I don't know. Removing the code (the _tcsstr part) makes the whole BHO dependent on open folders and explorer views...

For example, before uninstalling my app (the BHO) I need to shut down every folder (eplorer.exe) unless I want to reboot after the uninstall.

Any idead on what do to?

/Tommy

dialog in top left of screen

si_6931-Jul-03 3:43

si_69

31-Jul-03 3:43

Hi All

i have a modeless dialog, which i call from pressing a button
on my toolbar, within my SDI application, this then calls
a function defined by myself

for some reason, the dialog is always displayed in the top left of the screen,

im using the following code,

whenever i call modeless dialogs for anywhere else in my program,
they are always in the center, im controling this from my view class
if that makes a difference

CCPServerWait* m_pWaitDlg;

m_pWaitDlg = new CCPServerWait;
m_pWaitDlg->Create(IDD_DCPSERVER_WAIT);
m_pWaitDlg->UpdateData(FALSE);
m_pWaitDlg->ShowWindow(SW_SHOW);
m_pWaitDlg->UpdateWindow();

/// do something here

// close
m_pWaitDlg->DestroyWindow();

any1 any ideas

thanks

si Smile | :)

Re: dialog in top left of screen

si_6931-Jul-03 3:45

si_69

31-Jul-03 3:45

sorry,i should have put....

how do i get it to display in the middle, of the screen

thanks

si

Re: dialog in top left of screen

User 665831-Jul-03 4:01

User 6658

31-Jul-03 4:01

try m_pWaitDlg->CenterWindow(CWnd::GetDesktopWindow()); before ShowWindow();

regards

modified 12-Sep-18 21:01pm.

Re: dialog in top left of screen

si_6931-Jul-03 5:19

si_69

31-Jul-03 5:19

thanks greg Smile | :)

drag 'n drop CBitmap

selena31-Jul-03 3:29

selena

31-Jul-03 3:29

Hi, I am using Wes Rogers class CDragDropMgr to drag and drop CBitmaps. I am dragging the bitmap fine, but when I try to drop it (by calling CDragDropMgr::DoDrop() in View::OnDrop()) I can't get hold of the actual bitmap. I understand that the user defined class derived from CBitmap must implement the Serialize() method in order for this to work. I am implementing this method (archiving the bitmap size and the bits), but it still isn't working. Anyone have any ideas/tips??
Thanks,
Selena

Component oriented application

Jerome Conus31-Jul-03 3:25

Jerome Conus

31-Jul-03 3:25

Hi !

In our team, we used to develop COM/DCOM components for our applications. That made it easy to work in separate entities and not having to merge code.

But now, we have to develop a crossplatform application, which means COM/DCOM is not a usable solution.

I heared a little about CORBA, but I'm wondering if anyone of you already used it, or if I should use something different. And what about the price for a commercial application ? Is CORBA free ?

Thank you for your help !
Jerome

Re: Component oriented application

armentage31-Jul-03 4:00

armentage

31-Jul-03 4:00

COM is actually available on a number of UNIXes, and there's been an on going .NET type compiler for Linux/BSD.

Re: Component oriented application

Jim Crafton31-Jul-03 8:06

Jim Crafton

31-Jul-03 8:06

CORBA is simply a spec. What costs are the various implementation of the CORBA spec, typically referred to as a CORBA ORB (Object Request Broker). There are a number of good impls out there that are free. The two that come to mind are :

Mico[^]

TAO[^]

Both are written in C++ and supposed to be quite good, and both are cross platform.

CORBA is supposed to be a bit complex to get working/using, though if you have a lot of COM experience, I doubt it's much worse of a learning curve.

You might consider using Mozilla's XPCOM[^] which is nearly identical to how MS's COM works AFAIK. It support C++ as well and also runs cross platform.

Cheers

¡El diablo está en mis pantalones! ¡Mire, mire!

Real Mentats use only 100% pure, unfooled around with Sapho Juice(tm)!

MFC Tree View

rahulmsaxena31-Jul-03 3:24

rahulmsaxena

31-Jul-03 3:24

Dear MFC Gurus,
I have been struggling with a simple MFC demo. The project is basically for a tree view control, there are two views, the left view and the right view. The left view is derived from CTreeView and the right one from CEditView,the two views are separated by a Splitter window.

The project is designed to work as follows
On the left hand side are numbers (1,2,3,4...10)
When I click on 1,2,3.. (which is the parent), the children(1.1,1.2,1.3....1.9) are supposed to appear on the right side (The Edit View Window).
I found a similar example on this site but did'nt quite understand the programming logic behind it!
Could any body kindly make this project up for me, I am in the learning stages and would appreciate such valuable contributions..
hoping for the best
rahul

Re: MFC Tree View

Tim Ranker31-Jul-03 3:39

Tim Ranker

31-Jul-03 3:39

The best way to learn is to try to do it yourself and ask specific questions along the way. Don't ask for people to do your work(homework?) for you. Use some initiative. You will go a long way if you problem solve tasks like this yourself. I'm not trying to be mean, just giving advice.

Best of luck!

Re: MFC Tree View

rahulmsaxena31-Jul-03 3:51

rahulmsaxena

31-Jul-03 3:51

hi Tim,
Alright, here is the specific question, so far I have managed to have the tree view control and it does display the parent and children on clicking, with the static splitter window I see the same view on both sides, however this is not what I need! I need the children to be displayed on the right side.(CEditView)
I have an idea of mouse event functions such as OnSelChange that handles Tree View control notifications and takes care, but am not able to implement it.
For your information, I have created a class called Numbers that has an Index (Parent) and a CStringArray (Call it Child)that would hold the children.
All these objects referred as Numbers are stored in a CArray called Number_Array.The Numbers_Array and the Child are being populated in the OnInitialUpdate function of the CTreeView class.

I have been trying my best to get this through, I am also of the opinion that self help is the best way to learn, but at this point I feel completely lost and hence the question!
It would be great if you could reply

thanks
rahul

Re: MFC Tree View

Tim Ranker31-Jul-03 4:54

Tim Ranker

31-Jul-03 4:54

Hello Rahul,

It appears you already have the CSplitterWnd member variable added to your SDI frame or MDI child frame(not sure which you're using). To add the edit view you need to override the OnCreateClient() function of the frame window containing the CSplitterWnd member variable .

Example:
BOOL CSplitFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext) 
{
   CRect rect;
   CSize size;

   // Get the interior size of the frame
   GetClientRect( &rect );
   size = rect.Size();

   // Each column(view) will take half the width of the total frame
   size.cx /= 2; 

   // create splitter window
   if (!m_wndSplitter.CreateStatic(this, 1, 2))
   {
      return FALSE;
   }

   // Create the left tree view
   if (!m_wndSplitter.CreateView(0, 0, RUNTIME_CLASS(CYourTreeView), size, pContext)
   {
      TRACE("Failed to create tree view.");
      return FALSE;
   }
	
   // Create the right edit view
   if (!m_wndSplitter.CreateView(0, 1, RUNTIME_CLASS(CYourEditView), size, pContext)
   {
      TRACE("Failed to create edit view.");
      return FALSE;
   }

   return TRUE;
}

If you are using the standard doc-view architecture, there is a CDocument derive class that is shared by the two views. When you click on an item in your tree view, you can update a variable in the document which contains the number that was selected. After that document varialbe has been updated, you can UpdateAllViews and have the OnUpdate function of the CEditView display the data stored in the document. Remember, the purpose of the document object is to store the data the views need to display that data.

Happy programming!

Tim

Re: MFC Tree View

rahulmsaxena31-Jul-03 9:20

rahulmsaxena

31-Jul-03 9:20

hi Tim,
Thanks for the snippet, I am doing as you have suggested,I have created the function

OnSelChange(NMHDR *pNMHDR,LRESULT *pResult)
{

NM_TREEVIEW *pNMTREEVIEW = (NM_TREEVIEW*) pNMHDR;
CTreeCtrl &tree = GetTreeCtrl(); // Get the Tree Control reference

HTREEITEM hItem = tree.GetSelectedItem();// Get the currently selected item
*temp = tree.GetItemData(hItem); // Get the item value in this case 1,2,3.. I suppose

CString item_data = temp;

CTree1_ExampleDoc * pDoc = GetDocument(); // Get hold of the document

// Get the children of the selected item and update the document object!
for(int i=0;i<num_array.getsize();++i)
{
="" numbers="" num;="" refer="" below="" for="" the="" number="" defn.
="" cstring="" sfulllist;
="" num="Num_array.GetAt(i);
" if(item_data="Num.index)
" pdoc-="">Doc_Number.index= item_data;
for(int k=0;k<num.child.getsize();++k)
{
="" pdoc-="">Doc_Number.Child.Add(Num.Child.GetAt(k));
sFullList =sFullList+Num.Child.GetAt(k)+"\r\n";
}
break;
}
}

GetDocument()->SetModifiedFlag();
GetDocument()->UpdateAllViews(this,1L,(CObject*) &sFullList);
}

In the EditView Class there is a function OnUpdate listed below,for which I am retrieving the updated document object.

void CTree1_ExampleView::OnUpdate(CView* pSender, LPARAM lHint, CObject* pHint)
{
// TODO: Add your specialized code here and/or call the base class

if(lHint==1L)
{
CEdit & theEdit = GetEditCtrl();

// sFullList = ((CString*)pHint)->GetBuffer(0);

CTree1_ExampleDoc *pDoc = GetDocument();

Numbers View_Number;
View_Number.index = pDoc->Doc_Number.index;
CString sFullList;

for(int i=0;i<pdoc->Doc_Number.Child.GetSize();++i)
{
View_Number.Child.Add(pDoc->Doc_Number.Child.GetAt(i));

sFullList = sFullList+pDoc->Doc_Number.Child.GetAt(i)+ "\r\n";
}

// AfxMessageBox(sFullList);
theEdit.SetWindowText(sFullList);

this->Invalidate();
}

}

This however is not displaying the text in the edit window.
// Definition for Numbers

class Numbers
{
public:
CString index;
CString sub_index;

CStringArray Child;

Numbers& operator=(Numbers &num)
{
index = num.index;
sub_index = num.sub_index;
Child.Copy(num.Child);
return *this;
}
};

class Numbers_Array:public CArray<numbers,numbers&>,Numbers
{

};

Last question, How do I get the item currently selected by the mouse, Will I have to write a message handler such as OnMouseClick(); ???
Please suggest.

thanks
rahul

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