C / C++ / MFC Discussion Boards

jamiehale17-Jul-02 3:01

17-Jul-02 3:01

***repost for those of you that don't read the lounge***

Heya everyone, I'm trying to make a few bucks by selling off bits of my library. And since Amazon won't let a lowly Canadian sell their used books through them, I'm doing it on my own.

Have a look here to see if there's anything that grabs your attention.

Books For Sale [new window]

J

GetTextExtent? Should be simple?

Anonymous17-Jul-02 3:00

Anonymous

17-Jul-02 3:00

Sorry for the formatting, I can't seem to find the instructions on how to correctly format source code in these messages.

All I'm trying to do is have the title bar text of a SDI application have the usual title plus some right justified text (szReg). I was not able to do it using the CMainFrame OnPaint, so I tried to fudge it by adding spaces between the two strings until the extent of the text was about enough to fill the window width. I think I will need to take into consideration the border size later, but this code doesn't really get it very close. The text ends up quite a bit short of where I wanted it to be. (This is all done in my own UpdateFrameTitleForDocument()).

Thanks.

//The code --

CString szTitle = szText;
TRY{
CWindowDC dc(this);
CRect r;
GetWindowRect(&r);
int nWindWidth = r.Width();
int nSpace = nWindWidth;
szTitle += szReg;
//Acutal width of the title string
int nActualWidth = dc.GetTextExtent(szTitle).cx;
BOOL bStop = FALSE;
CString szSep;
int nCount = 0;
//keep looping until the width of the window
//is taken up by the string. Add spaces between
//the normal title, and the new (right justified)
//text I'm adding:
while (!bStop){
if (nActualWidth < nSpace){
//Not filled up yet, keep adding spaces
//between the strings:
szSep += " ";
szTitle = szText + szSep + szReg;
nActualWidth = dc.GetTextExtent(szTitle).cx;
}
else
bStop = TRUE;
nCount++;
if (nCount > 1000){
//this should not happen
bStop = TRUE;
SetWindowText(szText + " " + szReg);
}
}
SetWindowText(szTitle);
}
CATCH(CResourceException,e){
SetWindowText(szText + " " + szReg);
}
END_CATCH

Re: GetTextExtent? Should be simple?

Philippe Mori17-Jul-02 3:14

Philippe Mori

17-Jul-02 3:14

You should probably select the correct font in your DC.

Philippe Mori

Re: GetTextExtent? Should be simple?

Dave_17-Jul-02 4:13

Dave_

17-Jul-02 4:13

Is there an easy way to get the current title bar font?

Thanks for the reply.

Re: GetTextExtent? Should be simple?

Scott H. Settlemier17-Jul-02 6:10

Scott H. Settlemier

17-Jul-02 6:10

You have to use the SystemParametersInfo function
with the SPI_GETNONCLIENTMETRICS option.

Re: GetTextExtent? Should be simple?

Jason Henderson17-Jul-02 3:19

Jason Henderson

17-Jul-02 3:19

Use <pre> tags.

C++

//The code --

CString szTitle = szText;

TRY{
	CWindowDC dc(this);
	CRect r;
	GetWindowRect(&r); 
	int nWindWidth = r.Width();
	int nSpace = nWindWidth;

	szTitle += szReg;

	//Acutal width of the title string
	int nActualWidth = dc.GetTextExtent(szTitle).cx;
	BOOL bStop = FALSE;
	CString szSep;
	int nCount = 0;

	//keep looping until the width of the window
	//is taken up by the string. Add spaces between
	//the normal title, and the new (right justified)
	//text I'm adding:
	while (!bStop){
		if (nActualWidth < nSpace){
			//Not filled up yet, keep adding spaces
			//between the strings:
			szSep += " ";
			szTitle = szText + szSep + szReg;
			nActualWidth = dc.GetTextExtent(szTitle).cx;
		}
		else
			bStop = TRUE;
		
		nCount++;
		if (nCount > 1000){
			//this should not happen
			bStop = TRUE;
			SetWindowText(szText + " " + szReg); 
		}
	}
	
	SetWindowText(szTitle);
}
CATCH(CResourceException,e){
	SetWindowText(szText + " " + szReg);
}
END_CATCH

Jason Henderson
_{quasi-homepage}
^articles
_{"Like it or not, I'm right!"}

ActiveMovie4

Anonymous17-Jul-02 2:52

Anonymous

17-Jul-02 2:52

I have a window that contains an ActiveMovie4 control. I set the control window to be 500 x 500 originally, then the video resizes itself to suit the file opened. How can I get this new rect?
I tried GetWindowRect(), but this only gave me the rect that I initially set as 500 x 500. I also tried GetClientRect(), but this did the same thing and moved the dialog box outside of the main window. Please Help!!!

VT_ARRAY | VT_UI1

Hans Ruck17-Jul-02 2:24

Hans Ruck

17-Jul-02 2:24

I return a variant of this type from an ATL server's interface to an ASP script's object obj. len(obj) returns 0, although in a VB test application i can see a correct returned value.
Is this combination a good one? What else could i return, except BSTR?

rechi

Re: VT_ARRAY | VT_UI1

Anonymous17-Jul-02 2:33

Anonymous

17-Jul-02 2:33

Bogdan Rechi wrote:
len(obj) returns 0,

You are supposed to use LenB instaed of Len for binary data.

How to insert text to CStdioFile???

Raphael Kindt17-Jul-02 2:22

Raphael Kindt

17-Jul-02 2:22

Hi...

I want to insert text between 2 others lines in a text file.
Do I have to recreate this file or not???

Thanks in advance...

Hello World!!! Smile | :)

from Raphaël

Re: How to insert text to CStdioFile???

Joaquín M López Muñoz17-Jul-02 2:50

Joaquín M López Muñoz

17-Jul-02 2:50

The only way (to the best of my knowledge) is to create a new temporary file with the updated contents and then replacing the old file with this. Writing to a preexisting file works in an overwriting manner, rather than inserting extra space.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

no luck with changing text on toplevel menu

ns17-Jul-02 1:26

17-Jul-02 1:26

I tried the following:

void CMainFrame::OnChecking()
{
CMenu* mmenu = GetMenu();

mmenu->ModifyMenu(ID_CHECKING, MF_BYCOMMAND,ID_CHECKING, " Selection");
Invalidate();
This does change the title to "selection" but only after the second click. The old caption is still visible beneath the new one which looks like its on a button of its own placed over the old button. Please advise.
Thanks,
ns

Re: no luck with changing text on toplevel menu

567890123417-Jul-02 3:02

5678901234

17-Jul-02 3:02

Call function DrawMenuBar.

WoW! Thank you!!!!!

ns17-Jul-02 3:11

17-Jul-02 3:11

That was superb! I didnt know it existed! I really appreciate your help. MAny thanks!
ns

Implementing Windows->Close All Menu option in MDI application using VC++/MFC

Binoy17-Jul-02 1:25

Binoy

17-Jul-02 1:25

I have developed MFC based MDI application using VC++ 6.0. The application can open multiple documents using the File->Open menu option. Once there are many documents open, it is quite time consuming to close each of the documents one by one. For this reason I would be interested in providing a menu option under Windows popup menu i.e. Windows->CloseAll, that will help the application to close all the child windows at one shot. As an example the VC++ IDE can be referred, that provides this option. Can someone help me find a solution for doing this.

Thanks/Regards,

Re: Implementing Windows->Close All Menu option in MDI application using VC++/MFC

Joaquín M López Muñoz17-Jul-02 3:15

Joaquín M López Muñoz

17-Jul-02 3:15

This thread discusses a similar problem, namely that of minimizing all child windows. I guess you can use the technique described there to your purposes.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Implementing Windows->Close All Menu option in MDI application using VC++/MFC

Binoy21-Jul-02 18:44

Binoy

21-Jul-02 18:44

Hi,
There is another easy way of doing this by writing the message handler in the CMainFrame class. The code is as follows...

void CMainFrame::OnWindowCloseall()
{
CMDIChildWnd* child = NULL;
while((child = MDIGetActive())!=NULL)
{
if (child)
child->MDIDestroy();
}
}

This will be completely MFC based.

Thanks/Regards,

Window Region and Placement

Dov Sherman17-Jul-02 0:08

Dov Sherman

17-Jul-02 0:08

I'm working on an application which has a CWnd descended window called CAnimateWnd.

CAnimateWnd uses SetWindowRgn(hClipRgn, TRUE) to change the shape of the window frequently. It then uses SetWindowPos() to change the location of the window.

Calling SetWindowRgn() with the second param (bRedraw) TRUE causes the window to be redrawn. Changing the position of the window with SetWindowPos() or MoveWindow() causes the window to be redrawn. However, since the new shape of the window may look wrong until the window is in its new position, I want the window to be redrawn only once.

If I call SetWindowRgn() with bRedraw as FALSE, the area beneath the window is filled back under the assumption of the new region shape rather than the old, leaving bits of the previous view behind.

Is there a way to set the window region and change the position in the same instant?

Re: Window Region and Placement

Joaquín M López Muñoz17-Jul-02 2:21

Joaquín M López Muñoz

17-Jul-02 2:21

Hide the window before setting the new region and show it back after repositioning it.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Window Region and Placement

Dov Sherman17-Jul-02 2:47

Dov Sherman

17-Jul-02 2:47

That works but it also makes the window flicker. Is there any other way to do it?

Re: Window Region and Placement

Joaquín M López Muñoz17-Jul-02 2:58

Joaquín M López Muñoz

17-Jul-02 2:58

Well, I haven't tried this, but it might help reduce the flickering. Before repositioning the window, save its original surrounding rectangle with GetWindowRect. After repositiong, invalidate the desktop window with InvalidateRect using the rectangle previously saved.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Window Region and Placement

Dov Sherman17-Jul-02 4:58

Dov Sherman

17-Jul-02 4:58

That'sa good idea. I tried it but it didn't seem to have any effect at all. Maybe I'm doing it wrong. Do you see any obvious problems with this code?

<br />
void CAnimateWnd::ChangeAppearanceAndPosition(HRGN hNewRgn, int iPosX, int iPosY)<br />
{<br />
CRect oldRect;<br />
GetWindowRect(&oldRect);<br />
<br />
SetWindowRgn(hNewRgn, FALSE); // change shape without redrawing<br />
SetWindowPos(&wndTopMost, iPosX, iPosY, 100, 100, SWP_NOACTIVATE);<br />
<br />
::InvalidateRect( GetDesktopWindow()->GetSafeHwnd(), &oldRect, TRUE);<br />
}<br />

Re: Window Region and Placement

Joaquín M López Muñoz17-Jul-02 5:09

Joaquín M López Muñoz

17-Jul-02 5:09

The code seems OK to me Frown | :(

There are a couple of things you might want to try:

Do a ScreenToClient of the rectangle for the desktop window prior to using it in InvalidateRect.
Force the repainting of the desktop window with UpdateWindow after invalidating.

Other than these, I cannot come out with any other possible reason for this failing.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Window Region and Placement

Dov Sherman17-Jul-02 5:47

Dov Sherman

17-Jul-02 5:47

I tried each of those but there was no change. My guess is that, since I did not repaint during my SetWindowRgn() call, the desktop thinks it is intended to leave the bits of previous regions behind.

If I have to I can live with the flicker but I'd much rather have a perfectly smooth animation display.

Re: Window Region and Placement

Joaquín M López Muñoz17-Jul-02 6:54

Joaquín M López Muñoz

17-Jul-02 6:54

What about this?

void CAnimateWnd::ChangeAppearanceAndPosition(HRGN hNewRgn, int iPosX, int iPosY)
{
CRgn oldRgn;
oldRgn.CreateRectRgn(0,0,0,0);
GetWindowRgn(oldRgn);
SetWindowRgn(hNewRgn, FALSE); // change shape without redrawing
GetDesktopWindow()->InvalidateRect(&oldRgn);
SetWindowPos(&wndTopMost, iPosX, iPosY, 100, 100, SWP_NOACTIVATE);
}

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

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