Re: another static member question - C / C++ / MFC Discussion Boards

jmkhael7-Oct-02 4:26

7-Oct-02 4:26

MSDN:
Drag-and-Drop Operations
To support a drag-and-drop operation in a rich edit control, an application must first set an event mask by using the EM_SETEVENTMASK message to allow the EN_DROPFILES notification to be sent to the control's parent window. In the RICHED sample, when the parent window receives this notification, the DragQueryFile function is called to determine how many files have been dropped in the rich edit control. This sample allows the user to drop only one file at a time, so if more than one file has been dropped, the action is disallowed. If the user has dropped only one file, the application queries for the filename, opens the file, and reads it into the rich edit control. As you can see in the following code, the sample allows the user to drop only a TXT or an RTF file:

case WM_NOTIFY:
§
// Is the notification a drop notification?
else if (((LPNMHDR)lParam)->code == EN_DROPFILES)
{
WORD cFiles;
char lpszFile [80];
HANDLE hDrop;

// Get the handle to the drop object.
hDrop = ((ENDROPFILES *)lParam)->hDrop;
// Determine how many objects have been dropped.
cFiles = DragQueryFile (hDrop, 0xFFFF, (LPSTR)NULL, 0);
// If more than one object has been dropped, don't bother.
if (cFiles > 1)
return 0;
// Get the name of the file dropped.
DragQueryFile (hDrop, 0, lpszFile, sizeof (lpszFile));

// Open the file (TXT or RTF).
if (strstr (lpszFile, "TXT"))
OpenTheFile (hWndRichEdit, SF_TEXT, lpszFile);
else if (strstr (lpszFile, "RTF"))
OpenTheFile (hWndRichEdit, SF_RTF, lpszFile);
DragFinish (hDrop);
return 1;
}
return 0L;
break;

This code demonstrates one way that an application can handle a drop operation. Rich edit controls also support OLE drag and drop through the IRichEditOle and IRichEditOleCallback interfaces, which allow objects to be embedded in the control. The subject of embedding objects is beyond the scope of this book, however, so I will not cover it here.

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: HDROP???

Michael Dunn7-Oct-02 4:28

Michael Dunn

7-Oct-02 4:28

The HDROP is sent in wParam.

--Mike--
Just released - 1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Re: HDROP???

Ravi Bhavnani7-Oct-02 4:34

Ravi Bhavnani

7-Oct-02 4:34

Nitron wrote:
Couldn't find anything here or MSDN

Hmm, my MSDN (April 2000) says this:

hDrop
Handle to an internal structure describing the dropped files. Pass this handle DragFinish, DragQueryFile, or DragQueryPoint to retrieve information about the dropped files.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Thanx!

Nitron7-Oct-02 4:37

Nitron

7-Oct-02 4:37

I guess I was just looking for something like

hDrop.lpzFileName

Didn't relize I had to read... Dead | X|

Nitron
_________________________________________--
message sent on 100% recycled electrons.

static function question

ns7-Oct-02 3:39

7-Oct-02 3:39

I want to use CListCtrl's SortItem function. MSDN says there needs to be a comparison function which has to be:

The comparison function must be either a static member of a class or a stand alone function that is not a member of any class.

1. How do I make a static function of a class?

2. If it were a standalone function, I'd declare it in the .h file before the class definition (correct?). Would that be sufficient? Or do I have to specify the prototype in the cpp file before I use it?

Appreciate your help,
ns

Re: static function question

C^hris L^osinger7-Oct-02 3:39

C^hris L^osinger

7-Oct-02 3:39

in a .h
class MyClass
{
public:
  static int MyFunction(whatever);
};

and then in a .cpp, you implement the function. this function cannot access any non-static member variables of the class.

-c

No matter how fast light travels it finds the darkness has always got there first, and is waiting for it.
-- Terry Pratchett,

Etch-a-sketch!

another static member question

ns7-Oct-02 3:45

7-Oct-02 3:45

Where is this line supposed to be, from MSDN. In which file is it supposed to be? In the cpp file? If so, in the constructor?

// Static data members must be initialized at file scope, even
//    if private.

<code>float SavingsAccount::currentRate = 0.00154;</code>

currentRate is a static member variable(declared in the .h file).

Appreciate your help,
ns

Re: another static member question

Ravi Bhavnani7-Oct-02 4:32

Ravi Bhavnani

7-Oct-02 4:32

ns wrote:
Where is this line supposed to be,

In the class's .cpp file (theoretically it could be in any .cpp file but the obvious place is that of the class), outside the constructor. It's just a variable initialization.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

PowerPoint 2002 Automation, anyone tried ?

Braulio Dez7-Oct-02 3:14

Braulio Dez

7-Oct-02 3:14

Hi,

I'm trying to automated power point 2002... I have my own activeX, it Power Point 2002, I can activate it just by pressing double click ( then my ActiveX is up and running...).

BUT... in Power Point 2002, I have to go to Slide Show Mode to do that !!!!, is there anyway to activate it in the normal view ?

Thanks, so long
Braulio

Re: PowerPoint 2002 Automation, anyone tried ?

jmkhael7-Oct-02 5:18

jmkhael

7-Oct-02 5:18

http://www.codeproject.com/com/OLE_Automation.asp

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: PowerPoint 2002 Automation, anyone tried ?

Braulio Dez7-Oct-02 5:50

Braulio Dez

7-Oct-02 5:50

Hi,

Sorry but..

Ms Word and Excel models for automation are not that bad, but things like Power Point, or Outlook, are hell !, just give try to detect when really Power Point has been closed ( yeah you will found a sink, but that sink is just executed right before the message that ask you to cancel or save, so...)...

So long
Braulio

how to simulate the terrians?

wangnanjing7-Oct-02 3:16

wangnanjing

7-Oct-02 3:16

Hi,all,

About the animal's simulation project, i have another problem to
ask. That is,Whether there is any one who can provide a source code, which can be used for generating a specail terrai manually. Of cause 3D is best, but at first step if a 2D contour map can be displayed, that is enough.

thanks a lot!!!

wang

Re: how to simulate the terrians?

Chris Richardson7-Oct-02 6:48

Chris Richardson

7-Oct-02 6:48

< shameless plug >

http://www.terrainsoftware.com/products/TERRAIN.HTM[^]

< /shameless plug >

Chris Richardson

Re: how to simulate the terrians?

Maximilien7-Oct-02 7:39

Maximilien

7-Oct-02 7:39

This is a so very good shameless plug, your product looks very cool indeed !!!

Max.

Re: how to simulate the terrians?

Chris Richardson7-Oct-02 7:41

Chris Richardson

7-Oct-02 7:41

Thank you very much, you just made my day.

Smile | :)

Chris Richardson

Re: how to simulate the terrians?

Mike Nordell8-Oct-02 4:49

Mike Nordell

8-Oct-02 4:49

One might also display that Free Software alternatives exists.

Also, googling for "free terrain generator GPL" might turn up some more interesting code (replace GPL with whatever license you fancy).

Re: how to simulate the terrians?

Chris Richardson8-Oct-02 5:53

Chris Richardson

8-Oct-02 5:53

Yes, I could display that free software alternatives exist, but (A) I didn't feel like searching for it, and (B) my link was put inside < shameless plug > tags. Plus, most free software doesn't come with support, a lot of it can't be used for commercial work, etc.

Chris Richardson

derived class, but want base class function

ns7-Oct-02 3:06

7-Oct-02 3:06

The derived class has a deleteAllItems, so does the parent class (CListCtrl). I want to invoke the base function directly with a control variable of the derived class. Instead of

m_list1.DeleteAllItems()

which is the derived class definition,

I want to call the listctrls base function: Is it possible to do that?

Appreciate your help,
ns

Re: derived class, but want base class function

jhwurmbach7-Oct-02 3:23

jhwurmbach

7-Oct-02 3:23

You could Cast into a base-Object:

CListCtrl* pListC = &MyDerivedListCtrl;
pListC->DeleteAllItems();

Re: derived class, but want base class function

ns7-Oct-02 3:48

7-Oct-02 3:48

Thanks!

Appreciate your help,
ns

Re: derived class, but want base class function

Daniel Lohmann7-Oct-02 3:49

Daniel Lohmann

7-Oct-02 3:49

That would not work, if DeleteAllItems() is a virtual function. The syntax for explicitly calling a base member function is:

MyDerivedListControl.CListCtrl::DeleteAllItems();

--

Daniel Lohmann

http://www.losoft.de
(Hey, this page is worth looking! You can find some free and handy NT tools there Big Grin | :-D

)

Bitmap Problem

Renjith Ramachandran7-Oct-02 2:59

Renjith Ramachandran

7-Oct-02 2:59

hi all

how can we load a bitmap image in to a button control ,
which can change the background with the color of dialog/button control (changing the schemes through properties>>appearance tag)..

any idea..??

Regards
Renjith

A Programmer Never Dies...

Re: Bitmap Problem

Renjith Ramachandran7-Oct-02 4:11

Renjith Ramachandran

7-Oct-02 4:11

no answer..??????????????????

A Programmer Never Dies...

Re: Bitmap Problem

Renjith Ramachandran7-Oct-02 4:36

Renjith Ramachandran

7-Oct-02 4:36

no solution here.........?????????
ALAS...!!!!

Program The Life.

How to determine the last active windows from a tray icon notification handler

Daniel Lohmann7-Oct-02 2:56

Daniel Lohmann

7-Oct-02 2:56

Hi,

I am almost an expert on system programming, so I hope this GUI related question is easy to one of you:

I have an app that installs an icon in the system tray. If the user clicks on the icon a dialog appears. Now the user may switch to some other app, so the dialog maybe active (has the focus) and in the foreground or somewhere in the background.

If the user now clicks again the tray icon, I want to do the following:

If the dialog is not active, I want to activate it and bring it to front.
If the dialog is active, I want to dismiss it.

My problem is to determine inside the tray notification handler if the dialog has been active or not. I already tried the following:

GetForegroundWindow() returns the handle of the system tray window. (Well, this makes sense, it is the active window during the execution of the notification handler...)
GetFocus() always returns NULL
GetActiveWindow() also returns NULL
Same for GetLastActivePopup()

It seems that if you click on a tray icon, the system calls the notification handler and afterwards silently reactivates the window that was active before. That's the reason why GetForegroundWindow() always returns the system tray window, but the "visibly active window" seems not to loose its focus. However, I need to know which window was active <it>before the icon was clicked.

Any ideas Confused | :confused:

--

Daniel Lohmann

http://www.losoft.de
(Hey, this page is worth looking! You can find some free and handy NT tools there Big Grin | :-D

)

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.