CDC::GetTextExtent problem - C / C++ / MFC Discussion Boards

Play a sound?

kvan0718-Dec-02 2:34

kvan07

18-Dec-02 2:34

What's the easiest way to play a sound. Does VS have a function that will do this?

Re: Play a sound?

Daniel Strigl18-Dec-02 2:57

Daniel Strigl

18-Dec-02 2:57

Try the PlaySound(...) API function!

Daniel Wink | ;)

---------------------------
Never change a running system!

UpdateData won't cut it

18-Dec-02 2:29

I am designing a program that acts as a countdown timer. However, because the function called from the GUI doesn't stop running until the time has decremented to zero, the GUI can't show how much time is remaining. Here's the source:

void CtimerDlg::OnBnClickedStart()
{
int currentTime = 0;
int timeInSeconds = 0;
char min[5] = "";
char sec[5] = "";
char setTime[12] = "";

UpdateData(true);

currentTime = time(NULL);
minutesRemaining = setMinutes;
secondsRemaining = setSeconds;

sprintf(min, "%i", setMinutes);
sprintf(sec, "%i", setSeconds);
strcpy(setTime, min);
strcat(setTime, " : ");
strcat(setTime, sec);
startTime = setTime;

timeInSeconds = ((setMinutes * 60) + setSeconds);

while(timeInSeconds != 0)
{
if(currentTime != time(NULL))
{
if(secondsRemaining == 0)
secondsRemaining = 60;

timeInSeconds--;
secondsRemaining--;
sprintf(sec, "%i", secondsRemaining);
secLeft.SetWindowText(sec);

currentTime = time(NULL);
}

if(secondsRemaining == 59)
{
minutesRemaining--;
sprintf(min, "%i", minutesRemaining);
minLeft.SetWindowText(min);
}
}

UpdateData(false);
}
// end code

How can I get the GUI to update while the progam is executing?

-Thanks

Re: UpdateData won't cut it

electronicman_x18-Dec-02 2:42

electronicman_x

18-Dec-02 2:42

Maybe you should spawn a thread to countdown?

Jeff Rothenberg

Project Engineer
Vector CANtech, Inc.

Re: UpdateData won't cut it

benjymous18-Dec-02 3:32

benjymous

18-Dec-02 3:32

I'd use a timer instead, then you can have a handler function that gets called every second, which will allow normal GUI operations to continue

--
Help me! I'm turning into a grapefruit!

Re: UpdateData won't cut it

valikac18-Dec-02 5:34

valikac

18-Dec-02 5:34

There are several soltuions. One solutin is a timer queue timer that will call a callback after upon tick.

Kuphryn

Re: UpdateData won't cut it

Ravi Bhavnani18-Dec-02 10:39

Ravi Bhavnani

18-Dec-02 10:39

kvan07 wrote:
How can I get the GUI to update while the progam is executing?

Pump the message queue. See my TaskTimer[^] article for instructions.

/ravi

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

CDC::GetTextExtent problem

Brian van der Beek18-Dec-02 0:26

Brian van der Beek

18-Dec-02 0:26

Hi,

I have a CTreeCtrl with a font set to 'Courier'. When I try to determine the width of a text item in the tree I do something like:

<br />
  CDC* pDC = m_ctrlTree.GetDC();<br />
  int nItemWidth = pDC->GetTextExtent(strItem).cx;<br />

The width I receive is smaller than the actual text width. It seems that the font of the DC ('system') is not equal to the font of the tree control ('courier').

Does anyone know how this can be?

Re: CDC::GetTextExtent problem

Joaquín M López Muñoz18-Dec-02 1:24

Joaquín M López Muñoz

18-Dec-02 1:24

Try this (I haven't tested it, but it might work):

CDC* pDC = m_ctrlTree.GetDC();
CFont *pFont=pDC->SelectFont(m_ctrlTree.GetFont());
int nItemWidth = pDC->GetTextExtent(strItem).cx;
pDC->SelectFont(pFont);

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: CDC::GetTextExtent problem

Brian van der Beek18-Dec-02 1:32

Brian van der Beek

18-Dec-02 1:32

Thanx for your reply, but the CDC does not have a SelectFont.

Re: CDC::GetTextExtent problem

Joaquín M López Muñoz18-Dec-02 1:36

Joaquín M López Muñoz

18-Dec-02 1:36

It's a typo: Substitute SelectObject for SelectFont.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: CDC::GetTextExtent problem

Brian van der Beek18-Dec-02 2:25

Brian van der Beek

18-Dec-02 2:25

Thanx! It works! Smile | :)

Run window in os?

imran_rafique17-Dec-02 23:16

imran_rafique

17-Dec-02 23:16

In xp prof window when we click start->Run then run window(with title Run) appears
is there any way in a program that this window appears programatically ?
if it is an exe file where is it?
so that i could start it like a process.

r00d0034@yahoo.com

Re: Run window in os?

Christian Graus17-Dec-02 23:32

Christian Graus

17-Dec-02 23:32

It's a pretty simple thing, just use SHBrowseForFolder ( or whatever it is ) and ShellExecute and build your own.

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

How can I set or change in global printer setting ?

AhMan17-Dec-02 23:02

AhMan

17-Dec-02 23:02

I want to modify or set global printer setting.

1) Enter to Control_Panel -> Printer
2) right click on printer list and change setting

but I want to set from visual c++

How can I do that ?

Thank in advanced for your kindness

Re: How can I set or change in global printer setting ?

Christian Graus17-Dec-02 23:14

Christian Graus

17-Dec-02 23:14

I don't remember the details, but I am sure MSDN has a code snippet that does this. msdn.microsoft.com[^]

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Re: How can I set or change in global printer setting ?

AhMan17-Dec-02 23:41

AhMan

17-Dec-02 23:41

I can't find what exactly is this (I already search it)

Please tell me

Thanks a lot

Re: How can I set or change in global printer setting ?

Christian Graus18-Dec-02 9:43

Christian Graus

18-Dec-02 9:43

I'm sorry, I'm not trying to be difficult, I really don't know. I did this stuff 2 years ago and am sure it was there now, but they've been removing a lot of the useful stuff for VB.NET and C# information lately....

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Re: How can I set or change in global printer setting ?

Ravi Bhavnani18-Dec-02 10:42

Ravi Bhavnani

18-Dec-02 10:42

Perhaps EnumPrinters() and SetPrinter() may help. (This is just a guess). Good luck!

/ravi

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

Re: How can I set or change in global printer setting ?

AhMan18-Dec-02 15:44

AhMan

18-Dec-02 15:44

It's application default setting. I had try it before

Anyway. Is there set global printer setting ?

Thanks a lot

Rotated Font - GetTextExtentPoint32

Braulio Dez17-Dec-02 22:49

Braulio Dez

17-Dec-02 22:49

Hi,

I'm using Tahoma font ( well I've tried with Arial as well and...), I have realized when I display the text rotated (90º) it is not stretched at all ( in the normal way, sometimes I see that some letters have no space between them).

The problem is that GetTextExtentPoint doesn't calculate that extra space, so when I show the text rotated some times it doesn't fit to that space Frown | :-(

.

Is there a way to apply the same spacing for normal and rotated font layout ?, Or a way to calc the extra space needed for rotated fonts ?

Thanks in advance, greetings
Braulio

Slider control ...

Neha17-Dec-02 19:00

Neha

17-Dec-02 19:00

Hi,
I have a slider control if i click on the slider,
thumb doesn't move the exact position where i had clicked.
How can i make to move to exact position where i had clicked?

Regards
Neha

Re: Slider control ...

Ravi Bhavnani18-Dec-02 10:47

Ravi Bhavnani

18-Dec-02 10:47

Increasing the resolution of the range should do it.

/ravi

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

How should I set a pixels color?

rbc17-Dec-02 18:44

rbc

17-Dec-02 18:44

Hi,

I am trying to write a simple Mandelbrot set Visual C++ program.

I assume that I am not handeling the setting the color of a pixel
correctly.

Here's some of my code ...

<br />
...<br />
void CMand_View::OnDraw(CDC* pDC)<br />
{<br />
...<br />
	for( int i=0; i<320; i++ ) {<br />
		for( int j=0; j<200; j++ ) {<br />
			int c = CMand_View::Mandel_calcColor( i, j );<br />
			pDC->SetPixel(i,j, PALETTEINDEX(c));<br />
		}<br />
	}<br />
}<br />
...<br />
double CManel_View::Mandel_Abs ( double real, double img ) {<br />
	double rc = real * real + img * img;<br />
	return sqrt( rc );<br />
}<br />
<br />
int CMand_View::Mandel_calcColor( int X, int Y ) {<br />
	<br />
	int N;         		//  WHILE-loop control variable <br />
	double XPos, YPos;	// The real and imaginary parts of C<br />
	double RealPart; 		// The real part of Z<br />
	double ImagPart; 		// The imaginary part of Z<br />
	int AbsZ;     		// BOOLEAN;<br />
	double Temp;<br />
<br />
        double width = 320.0;<br />
        double height = 200.0;<br />
<br />
	N 		= 0;<br />
	AbsZ 		= TRUE;<br />
	RealPart 	= 0;<br />
	ImagPart 	= 0;<br />
	XPos 		= X / width  * (XMax - XMin) + XMin;<br />
	YPos 		= Y / height * (YMax - YMin) + YMin;<br />
<br />
	while ( (N < Iterations) && (AbsZ == TRUE) ) {<br />
		N++;<br />
		Temp 		= (RealPart*RealPart) - (ImagPart*ImagPart) + XPos;<br />
		ImagPart 	= 2.0 * ImagPart * RealPart + YPos;<br />
		RealPart 	= Temp;<br />
		AbsZ 		= (( CMand_View::Mandel_Abs (ImagPart, RealPart) <= Bailout) ? TRUE : FALSE);<br />
	} //end while<br />
<br />
	if (AbsZ == 0 ) {<br />
		return (N + sColor) % Colors;<br />
	} else {<br />
		return 0;<br />
	}<br />
} //end calcColor<br />
<br />

I think that this ...

<br />
			pDC->SetPixel(i,j, PALETTEINDEX(c));<br />

... is not right. Confused | :confused:

Re: How should I set a pixels color?

Christian Graus17-Dec-02 18:50

Christian Graus

17-Dec-02 18:50

Are you using 256 colours ? Try it in a higher res. The last paremeter as an RGB value ( as returned by the RGB macro ) will work. It will be slow though. A DIBSection would give you a pixel array to set directly instead.

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

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