Re: Setting a window's font - C / C++ / MFC Discussion Boards

Christian Graus25-Oct-01 23:42

25-Oct-01 23:42

Could you post an example, I've been unable to get it to work.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Re: Setting a window's font

Nish Nishant26-Oct-01 0:01

Nish Nishant

26-Oct-01 0:01

I tried it out and it worked fine
medit is a global HWND

medit=CreateWindow("EDIT","",WS_VISIBLE|WS_CHILD|WS_BORDER,10,10,300,30,hWnd,NULL,
      hInstance,NULL);
  HFONT hfont;
  hfont=CreateFont(25,12,0,0,700,TRUE,0,0,DEFAULT_CHARSET,
      OUT_DEFAULT_PRECIS,CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,DEFAULT_PITCH,
      "Times New Roman");
  SendMessage(medit,WM_SETFONT,(WPARAM)hfont,0);

Re: Setting a window's font

Tomasz Sowinski26-Oct-01 0:03

Tomasz Sowinski

26-Oct-01 0:03

Are you sure that lifetime of HFONT is long enough? You can't just pass a HFONT to a Window with WM_SETFONT and destroy the font - the window doesn't copy the font.

The second thing is that not all Windows support this message. Standard controls do, but your own Window classes do not unless you explicitly handle this message.

Tomasz Sowinski -- http://www.shooltz.com

Re: Setting a window's font

Nish Nishant26-Oct-01 0:09

Nish Nishant

26-Oct-01 0:09

the HFONT is only a handle to the font
the HFONT variable need not last the life time of the control
once you send the WM_SETFONT message to the font then you can forget your HFONT variable
even if the HFONT variable is destroyed the font is not destroyed

for that, you may use DeleteObject

Nish

Re: Setting a window's font

Tomasz Sowinski26-Oct-01 0:17

Tomasz Sowinski

26-Oct-01 0:17

Sorry, you're wrong. HFONT needs to last as long as the window which uses it. If you destroy the HFONT with DeleteObject, the window painting will fail (SelectObject somewhere inside WM_PAINT handler will not work and subsequent calls to TextOut or DrawText will use default font).

Tomasz Sowinski -- http://www.shooltz.com

Re: Setting a window's font

Nish Nishant26-Oct-01 0:23

Nish Nishant

26-Oct-01 0:23

Hello tomasz

I wasnt wrong
I clearly said that if the HFONT variable gets destroyed there is no problem as the CreateFont created front is still alive. I clearly said that for the font to be destroyed you need to call DeleteObject. But if you dont call DeleteObject your font is alive and well and you can forget about the HFONT variable

Nish

Re: Setting a window's font

Tomasz Sowinski26-Oct-01 0:25

Tomasz Sowinski

26-Oct-01 0:25

Let's clear things: by 'lifetime of a HFONT' I mean the time between CreateFont[Indirect] and DeleteObject. I'm not talking about local variable of type HFONT.

Tomasz Sowinski -- http://www.shooltz.com

Re: Setting a window's font

Nish Nishant26-Oct-01 0:30

Nish Nishant

26-Oct-01 0:30

oh!

sorry tomasz....
got you wrong

my fault Frown | :-(

Nish

Re: Setting a window's font

Tomasz Sowinski26-Oct-01 0:40

Tomasz Sowinski

26-Oct-01 0:40

This is my fault as well - instead of technobabble like 'lifetime of a HFONT' I should just write 'you can't immediately delete a font you've set with WM_SETFONT'.

Cheers,

Tomasz Sowinski -- http://www.shooltz.com

Re: Setting a window's font

Nish Nishant26-Oct-01 0:43

Nish Nishant

26-Oct-01 0:43

maybe...

Nish

Re: Setting a window's font

Christian Graus26-Oct-01 2:10

Christian Graus

26-Oct-01 2:10

Nish is talking about a deliberate memory leak.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

How to detect that a user has logged in (Service & NT)

EiSl25-Oct-01 21:10

EiSl

25-Oct-01 21:10

Hello folks,

I know that a service process (under NT/Win2k) should not communicate with GUI, since no user has to be logged in so no shell is available.

But...
When my service is crashing (unhandled exception), I want my general exception handler sends a messagebox to the user in case there's a user logged in.

So...
How can I detect if a shell exist (aka: a user is logged in), so I can safely shoot a messagebox.

Thanks,

EiSl

Re: How to detect that a user has logged in (Service & NT)

Nish Nishant25-Oct-01 23:41

Nish Nishant

25-Oct-01 23:41

hi
this might be a dumb technique but I think you can use GetDesktopWindow() and if that returns NULL, that probably means there is no user logged in

nish

Re: How to detect that a user has logged in (Service & NT)

Tomasz Sowinski25-Oct-01 23:54

Tomasz Sowinski

25-Oct-01 23:54

I think you should rather write this info to the Windows Event Log.

Anyway, if you need to interact with the desktop, first read 'Interactive Services' in your VC++ help. It should be under Platform SDK/DLLs, Processes, and Threads.

Tomasz Sowinski -- http://www.shooltz.com

Localization

ZAZA25-Oct-01 20:27

ZAZA

25-Oct-01 20:27

I am still trying to choose the language of the standard dialog boxes...
I succeed for all common dialog boxes (printer setup, save as...): Just for try, I put the right comdlg32.dll version (the english one, I am on a french OS)in the working directory of my app and what was my surprise to see that it is working!!! I run my app, clic the "open file" item and the english box was display. I let it open on the desktop and run notepad to clic the same item: the box has been open in french!!!

But I steel searching for the monthes and days names of the calendar. The call of the calendar APIs seems to be in the comctl32.dll but I can't load another version of this DLL as I do for comdlg32.

elisabeth.sever@europlacer.fr

C++ templates

Jim Crafton25-Oct-01 20:05

Jim Crafton

25-Oct-01 20:05

If you have a DLL that exports a number of classes, many of which a template classes, and you find that there is a common templated type that is being used over and over again, is there something special you're supposed to do for this ? I realize I may not be explaining this very clearly so here's an example:
so I have this:
template <class t=""> class A {
///whatever
};

and I find I am using A<int> all over the place in the library. Should there be some special instantiation of the template type ? Is this more efficient ? Does it even matter ?

Re: C++ templates

Michael Dunn25-Oct-01 21:00

Michael Dunn

25-Oct-01 21:00

I find I am using A<int> all over the place in the library.

A simple typedef A<int> AINT will save you a bit of typing. Since this is only a compile-time thing, there is no difference in the resulting binary.

--Mike--
http://home.inreach.com/mdunn/
This posting is provided "as was" with no warranties, guarantees, lotteries, or any of those little bags of peanuts you get on planes. You assume all risk for crossing the street without holding mommy's hand. © 2001 Mike's Classy Software. Member FDIC. If rash develops, discontinue use.
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Cancel WaitCommEvent for non-overlapped IO

25-Oct-01 19:53

Guys,

Is there any way to cancel WaitCommEvent for non-overlapped IO ?

Thanx..

Re: Cancel WaitCommEvent for non-overlapped IO

Colin Urquhart28-Oct-01 13:02

Colin Urquhart

28-Oct-01 13:02

You can't...

Only one thing at a time can be done to a non-overlapped serial port.
See Q105302

Col Smile | :)

how to get mouse click function called on capture window

25-Oct-01 19:39

how can i get a responce to a click on a capture window. i tried ONLBUTTONDOWN but no responce

Re: how to get mouse click function called on capture window

Christian Graus25-Oct-01 20:57

Christian Graus

25-Oct-01 20:57

I found the only way to make this work was to keep firing a timer that called SetCapture over and over, and doing this in OnMouseMove:

CPoint pt;
GetCursorPos(&pt);

CRect rc;
GetWindowRect(&rc);

if (rc.PtInRect(pt))
    ReleaseCapture();

Here's the timer function:

if(nIDEvent == ID_TIMER_SETCAPTURE) // ID defined above
{
    CPoint pt;
    GetCursorPos(&pt);

    CRect rc;
    GetWindowRect(&rc);

    if (!rc.PtInRect(pt))
        SetCapture();
}

I did not find another solution that captured the mouse AND got the click messages inside the dialog class. If you find one, please LMK because I thought this very ugly indeed.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Downloading Dialog box

Gopi Krishna25-Oct-01 17:29

Gopi Krishna

25-Oct-01 17:29

Dear friends,
i've created one dialog box, which shows the downloading status of a file from the internet. but, the speed is a bit slower than the actual windows downloading dialog box. can any1 suggest how to make my dialog box downloads more faster than the windows one. thanx in advance...gopi

Help! Header Notification errors?

Jim Crafton25-Oct-01 17:25

Jim Crafton

25-Oct-01 17:25

Does anyone know if HDN_BEGINTRACK ever gets sent correctly ? I have a listview in report mode and when I click and drag the header divider, the HDN_BEGINTRACK message is never sent. Is this a known bug ? I looked on MSDN and didn't see much. I am writing in raw Win32, not MFC, if that matters.

Re: Help! Header Notification errors?

Christian Graus25-Oct-01 17:34

Christian Graus

25-Oct-01 17:34

Stupid question, but you're checking for it properly as a WM_NOTIFY message ? Have you tried Spy ++ to see if it gets sent ?

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Re: Help! Header Notification errors?

Jim Crafton25-Oct-01 17:37

Jim Crafton

25-Oct-01 17:37

Yeah, I checked in spy, and as far as I can tell it never appears to get fired. Which seems rather odd to say the least. What's even weirder, is that HDN_ENDTRACK does get sent, and HDN_TRACKING does not get sent. very frustrating.

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