C / C++ / MFC

9-Mar-06 22:10

i want to stop timer when mouse enter in the dialog and start timer when mouse leave from dialog.

so i handel NCHITTEXT event and killtimer at this event but now when mouse leave from dialog i want to start timer so how can i do this.

Bankey Khandelwal
Software Engineer

Naveen9-Mar-06 22:13

Naveen

9-Mar-06 22:13

U an get the mouse leave message if u use the API

TrackMouseEvent()

nave

Stephen Hewitt9-Mar-06 22:14

9-Mar-06 22:14

Perhaps the WM_MOUSELEAVE will do the trick.

Steve

baldha rakesh9-Mar-06 22:24

9-Mar-06 22:24

THERE IS NO SUCH EVENT

Bankey Khandelwal
Software Engineer

Stephen Hewitt9-Mar-06 22:26

9-Mar-06 22:26

Yes there is.[^]

Steve

helf regarding pointer to an diolog class in mfc

MANISH RASTOGI9-Mar-06 22:57

MANISH RASTOGI

9-Mar-06 22:57

Normally OnkillFocus of dialog is not called when the mouse leaves the dialog. The one way to solve this problem is
First take a member variable of bool type in that dialog.
In constructor set the value of variable false.
in mousemove event check the value of that member variable if it is false then set it true and call SetCapture. and stop timer.

if value of member variable is true then check that coordinates come into point variable lies inside the dialog.if it lies outside the dialog then call ReleaseCapture, Set the value of variable false and start timer.

Basically when you setcpature in a dialog and mouse goes outside the dialog then window sends one WM_MOUSEMOVE message to that dialog with the coordinates lies outside the dialog. With the help of those coordinates you can easily get the mouse is inside the dialog or outside the dialog.

Manish Rastogi

sunny4u_iitkgp9-Mar-06 22:03

sunny4u_iitkgp

9-Mar-06 22:03

well.. i am a novice as far as mfc prog is concerned.... so plz help

theres is this dialog class... CServerDlg
whose data i wanted to access from this func
unsigned WINAPI ClientThread(LPVOID threadInfo)
for which i used : CServerDlg *dlg = (CServerDlg *)AfxGetApp();
using this pointer i was accessing the data....
but thers some prob in this..and the app soon terminates.

probably this is not correct way of calling data from CServerDlg class....

plz helo with a solution to this problem

Re: helf regarding pointer to an diolog class in mfc

toxcct9-Mar-06 22:08

toxcct

9-Mar-06 22:08

i suspect you to have set te data members as public inside the dialog box. you loose the use of encapsulation...
i know this doesn't solve your problem, but you could get into troubles later.
consider passing by member functions instead.

Re: helf regarding pointer to an diolog class in mfc

Stephen Hewitt9-Mar-06 22:10

Re: helf regarding pointer to an diolog class in mfc

9-Mar-06 22:10

The problem is that AfxGetApp gets a pointer to an CWinApp instance and not a dialog class. You shouldn't be using C-style casts. If you had of used a function style cast as shown below you couldn't have made this mistake as the code wouldn't have compiled:

CServerDlg *dlg = static_cast<CServerDlg*>(AfxGetApp());

If you try to do something impossible, in a perfect world, you should get a compiler error instead of a crash: Switching to function style casts is a positive step in this direction.

In my own code I never use C-style casts.

Steve

Monty²9-Mar-06 22:15

Re: helf regarding pointer to an diolog class in mfc

9-Mar-06 22:15

This is the third time you have beaten me to it, and i forgot to mention CServerDlg as well Smile | :)

C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg

Stephen Hewitt9-Mar-06 22:18

Re: helf regarding pointer to an diolog class in mfc

9-Mar-06 22:18

Steve

Monty²9-Mar-06 22:13

9-Mar-06 22:13

Using MFC objects in seperate threads is not always a good idea due to nature of the library.

Instead define a struct

struct ThreadData {
//whatever data the thread needs
};

when you create the thread

ThreadData *pData = new ThreadData;
//fill up the pData
CreateThread(NULL,0,ThreadFuncName,pData,0,&dwThreadId);

Then in the ThreadFuncName function

...ThreadFuncName(LPVOID lpVoid)
{
   ThreadData *pData = (ThreadData*)lpVoid;
   //Use the pData
   return 0;
}

And if u wish to communicate to some windows then use HWND's not CWnd's to send messages

C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg

bar code

_tasleem9-Mar-06 21:50

_tasleem

9-Mar-06 21:50

hi all
i want to generate the code 39 barcode.i had search on the internet but could not find any algo for making the code 39 bar code any link u people visited or known.

ddd

Re: bar code

Cedric Moonen9-Mar-06 21:56

Cedric Moonen

9-Mar-06 21:56

Is this article [^]of any help ?

Re: bar code

Monty²9-Mar-06 21:56

9-Mar-06 21:56

Don't know much about bar codes but i saw this[^] once

C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg

Re: bar code

David Crow10-Mar-06 2:58

David Crow

10-Mar-06 2:58

How about using a font?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Using the Library

itkid9-Mar-06 21:41

itkid

9-Mar-06 21:41

Hi,
I want to pass the reference(test) of the interface (ITest) define inside the COM DLL (TestCom.dll) in my application function.Example
GetMerchItemType( TestComLib::ITest &test, int Temp)
However I am facing the following error.
error C2653: 'TestComLib' : is not a class or namespace name
error C2061: syntax error : identifier 'ITest'
Can you please help me resolve this error.

Thanks
Smile | :)

-- modified at 3:42 Friday 10th March, 2006

Re: Using the Library

MF9-Mar-06 22:45

9-Mar-06 22:45

You have to import the typelib of the testcom.dll into your project.

Re: Using the Library

Stephen Hewitt9-Mar-06 22:47

how to show menu on right click of mouse on dialog

9-Mar-06 22:47

Search for the definition of ITest. Is it enclosed in a namespace called TestComLib? I assume you're using #import. If you are you'll need to look in the .TLH and .TLI files.

Steve

baldha rakesh9-Mar-06 21:37

Re: how to show menu on right click of mouse on dialog

9-Mar-06 21:37

i want to make popu menu which show on right click of mouse how can i done it.

Bankey Khandelwal
Software Engineer

Monty²9-Mar-06 21:54

Re: how to show menu on right click of mouse on dialog

9-Mar-06 21:54

Add a menu, then add a submenu to the menu.

The use Classwizard to add a Message Handler for WM_RBUTTONCLICK

writting from memory s please confirm

In Handler

...::OnRclick()
{
     DWORD dwMousePos = GetMessagePos();
    
     //Confirm the HIWORD and LOWORD please 
     CPoint pt(HIWORD(dwMousePos),LOWORD(dwMousePos));

     //Use ScreenToClient to change the coordinates if needed
 
     CMenu menu;
     menu.LoadMenu(IDR_MENU1);

     CMenu *pSubMenu = menu.GetSubMenu(0);

     pSubMenu->TrackPopupMenu(...);     
}

hope it helps

C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg

Xing Chen9-Mar-06 21:56

Xing Chen

9-Mar-06 21:56

<br />
VOID APIENTRY DisplayContextMenu(HWND hwnd, POINT pt) <br />
{ <br />
    HMENU hmenu;            // top-level menu <br />
    HMENU hmenuTrackPopup;  // shortcut menu <br />
 <br />
    // Load the menu resource. <br />
 <br />
    if ((hmenu = LoadMenu(hinst, "ShortcutExample")) == NULL) <br />
        return; <br />
 <br />
    // TrackPopupMenu cannot display the menu bar so get <br />
    // a handle to the first shortcut menu. <br />
 <br />
    hmenuTrackPopup = GetSubMenu(hmenu, 0); <br />
 <br />
    // Display the shortcut menu. Track the right mouse <br />
    // button. <br />
 <br />
    TrackPopupMenu(hmenuTrackPopup, <br />
            TPM_LEFTALIGN | TPM_RIGHTBUTTON, <br />
            pt.x, pt.y, 0, hwnd, NULL); <br />
 <br />
    // Destroy the menu. <br />
 <br />
    DestroyMenu(hmenu); <br />
} <br />

Re: how to show menu on right click of mouse on dialog

baldha rakesh9-Mar-06 21:57