C / C++ / MFC

convert float to int without rounding

5-Jun-04 11:07

when i statically link the MFC libarary

i get this warning when i go to build the release
LINK : warning LNK4089: all references to "SHELL32.dll" discarded by /OPT:REF

what can i do about this?

Re: /OPT:REF

cmk5-Jun-04 11:11

cmk

5-Jun-04 11:11

There is nothing to do.
- Linker told to link to shell32.dll.
- Linker told not to link to modules where no functions are being used.
- Linker found that module being compiled does not use any functions from shell32.dll.
- Linker telling you this.

...cmk

Save the whales - collect the whole set

Re: /OPT:REF

Joe Woodbury6-Jun-04 11:25

Joe Woodbury

6-Jun-04 11:25

Go to the command line linker options and add /IGNORE:4089. (This warning is purely informational. Ignoring it causes no problems.)

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Dev5785-Jun-04 10:32

Dev578

5-Jun-04 10:32

How would one convert a float to an int without rounding it? Currently:

float f = 1.9;
int i = (int)f;

i would equal 2. How do I get it to not round, and have i equal 1 in the above example? Any help is appreciated.

-Dev578

Tim Smith5-Jun-04 10:40

Tim Smith

5-Jun-04 10:40

As defined by the C++ standard, floating to integer conversions truncate. So 1.9 would convert to 1.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

PJ Arends5-Jun-04 11:08

PJ Arends

5-Jun-04 11:08

int i = (int)(f + 0.5);

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

Gary R. Wheeler6-Jun-04 3:52

Gary R. Wheeler

6-Jun-04 3:52

You expression rounds, which I think is the opposite of what he wants, which is simple truncation.

Software Zen: delete this;

Gary R. Wheeler6-Jun-04 3:57

Gary R. Wheeler

6-Jun-04 3:57

i would not equal 2. Simple 'C'-style casts truncate, so you will see i == 1.

Software Zen: delete this;

EnumWindows

Archer2825-Jun-04 9:49

5-Jun-04 9:49

Ok, i cannot get of this stupid error

Process ViewerDlg.cpp(151) : error C2664: 'EnumWindows' : cannot convert parameter 1 from 'int (struct HWND__ *,long)' to 'int (__stdcall *)(struct HWND__ *,long)'
None of the functions with this name in scope match the target type

Line 151: EnumWindows( GetWindows, 0 );

and my definition of GetWindows

BOOL CALLBACK GetWindows( HWND hwnd, LPARAM lParam );

Note: this is an MFC project

peterchen5-Jun-04 10:30

peterchen

5-Jun-04 10:30

sure about that CALLBACK part? It provides exactly the __stdcall part the compiler is missing. Search your project for other occurences / definitions of GetWindows

we are here to help each other get through this thing, whatever it is Vonnegut jr.

sighist || Agile Programming | doxygen

Archer2825-Jun-04 10:32

5-Jun-04 10:32

its not the GetWindows name, i even tried renaming the function
and i dont know what to do about the CALLBACK do you?

peterchen5-Jun-04 11:37

peterchen

5-Jun-04 11:37

Sorry, I meant: please double check that the "CALLBACK actually is there.

What platform are you compiling for? Win32 / Intel?

we are here to help each other get through this thing, whatever it is Vonnegut jr.

sighist || Agile Programming | doxygen

Archer2825-Jun-04 11:44

5-Jun-04 11:44

ohh, yes, the CALLBACK is there,
i even tried replacing CALLBACK with __stdcall
i have never had any problems using EnumWindows outside of MFC projects,

if it comes down to it i may just use GetTopWindow()
and GetNextWindow();
although i really prefer not too

User 66585-Jun-04 14:05

User 6658

5-Jun-04 14:05

Do you use the CALLBACK function as a member-function of your dialog class?

In case you do, take a look at this article

regards

modified 12-Sep-18 21:01pm.

Integrating the MS VC Toolkit 2003 into VC6.0

David Crow7-Jun-04 2:56

David Crow

7-Jun-04 2:56

This worked fine for me:

BOOL CALLBACK GetWindows( HWND, LPARAM )
{
    return 0;
}

BOOL CMyDlg::OnInitDialog()
{
    CDialog::OnInitDialog();
    EnumWindows(GetWindows, 0);
}

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

steven115-Jun-04 9:49

steven11

5-Jun-04 9:49

Hi,
I've been trying desperately integrating the new compiler into the VC++ 6.0 IDE. I put the directories (bin, include and lib) of the toolkit at top of the list and the new compiler compiles Smile | :)

But now I get either linker errors (LNK2001, over 300 times...) for all the STL-Stuff or - if i change the order of the directories - get over 1000 compiler errors in the header files of the toolkit.
has anybody successfully integrated the toolkit to vc6 or knows good links about this topic (i searched the web but didn't manage to find something useful)

Re: Integrating the MS VC Toolkit 2003 into VC6.0

bneacetp5-Jun-04 14:39

bneacetp

5-Jun-04 14:39

For your situation, I hope that I am wrong, but I don't think that you can put the MS VC Toolkit 2003 into VC6.0, partly if not entirely because of the vast version differences.

Happy Programming and God Bless!

Internet::WWW::CodeProject::bneacetp

Painting in dialogs: WM_PAINT

kfaday5-Jun-04 9:43

kfaday

5-Jun-04 9:43

Hello!
I've been told that everything to be drawn in a dialog needs to be in the OnPaint method. Or else when you minimize and maximize again you won't seen anything.
i have these two functions that paint on the dialog when i click the left mouse button :

<br />
void CVentanaPizarra::OnMouseMove(UINT nFlags, CPoint point) <br />
{<br />
		if (nFlags == MK_LBUTTON)<br />
		{<br />
			CClientDC dc(this);<br />
			CPen Lapiz; <br />
<br />
			Lapiz.CreatePen (PS_SOLID,1,RGB(0,0,0));   <br />
			dc.SelectObject(Lapiz);               <br />
<br />
			if ((m_PosMouse.x!=-1)&&(m_PosMouse.y!=-1))<br />
			{<br />
				dc.MoveTo(point.x, point.y);<br />
				dc.LineTo(m_PosMouse.x,m_PosMouse.y);<br />
			}<br />
			dc.MoveTo(point.x, point.y);<br />
			dc.LineTo(point.x+(int).5, point.y+(int).5);<br />
			m_PosMouse=dc.GetCurrentPosition();	<br />
		}<br />
	CDialog::OnMouseMove(nFlags, point);<br />
}<br />
<br />
void CVentanaPizarra::OnLButtonUp(UINT nFlags, CPoint point) <br />
{<br />
	m_PosMouse.x=-1;<br />
	m_PosMouse.y=-1;<br />
	CDialog::OnLButtonUp(nFlags, point);<br />
}<br />

the problem is that it's not in the OnPaint function.
How could i do to stop what i've drawn from erasing when i minimize the window?

thanks!

bneacetp5-Jun-04 13:05

bneacetp

5-Jun-04 13:05

kfaday wrote:
the problem is that it's not in the OnPaint function.
How could i do to stop what i've drawn from erasing when i minimize the window?

The OnDraw function is the funtion that repaints the view whenever it needs to be painted. Place your drawing code within that function (or call the function that you have doing the drawing in OnDraw) and that should solve your problem. You can also call your view class's Invalidate() function to repaint the view as you need to.

Good luck on your programming efforts. Smile | :)

Happy Programming and God Bless!

Internet::WWW::CodeProject::bneacetp

kfaday5-Jun-04 13:18

kfaday

5-Jun-04 13:18

i'm trying to store points, and then redraw in the OnDraw function, but i'm not successful.

I've declared in the header file

typedef std::list<CPoint> CListaPuntos;

inside the class there's:

CListaPuntos ListaPuntos;

In the constructor of the class, i've written:

m_PosMouse.x=-1;
m_PosMouse.y=-1;
this->ListaPuntos.push_back(m_PosMouse);

In the list, i store a Cpoint variable with (-1,-1)

Then, this is the function which draws and stores points in the list

void CVentanaPizarra::OnMouseMove(UINT nFlags, CPoint point) 
{
	if (m_DibLapiz)
	{
		CRect rect;
		GetClientRect(rect);

		if ((nFlags == MK_LBUTTON) && ((m_PosMouse.x>rect.left+90) || (m_PosMouse.x==-1)))
		{
			CClientDC dc(this);
			CPen Lapiz; 

			Lapiz.CreatePen (PS_SOLID,1,RGB(0,0,0));   
			dc.SelectObject(Lapiz);               
			
			if (point.x>rect.left+90)
			{
				CPoint punto;
				if ((m_PosMouse.x!=-1)&&(m_PosMouse.y!=-1))
				{
					this->ListaPuntos.push_back(point);
					dc.MoveTo(point.x, point.y);
					dc.LineTo(m_PosMouse.x,m_PosMouse.y);
				}
				dc.MoveTo(point.x, point.y);
				this->ListaPuntos.push_back(point);
				punto.x=point.x+(int).5;
				punto.y=point.y+(int).5;
				dc.LineTo(punto.x, punto.y);
				this->ListaPuntos.push_back(punto);
			}
			m_PosMouse=dc.GetCurrentPosition();	
		}
	}
	CDialog::OnMouseMove(nFlags, point);
}

this function compliments the abovementioned one:

void CVentanaPizarra::OnLButtonUp(UINT nFlags, CPoint point) 
{
	m_PosMouse.x=-1;
	m_PosMouse.y=-1;
	this->ListaPuntos.push_back(m_PosMouse);
	CDialog::OnLButtonUp(nFlags, point);
}

and this is the onpaint function:

void CVentanaPizarra::OnPaint() 
{
	CPaintDC dlgDC(this); // device context for painting
	PintarBlanco(dlgDC);
	
	if (ListaPuntos.size()>1)
	{
		CPoint punto1, punto2;
		for (CListaPuntos::iterator i = ListaPuntos.begin(); i != ListaPuntos.end(); i++)
		{
			punto1= *i;
			if (i==ListaPuntos.end())
				break;
			if (punto1.x!=-1)
			{
				dlgDC.LineTo(punto1.x,punto1.x);
				dlgDC.MoveTo(punto1.x,punto1.y);
			}
			i++;
			if (i==ListaPuntos.end())
				break;
			punto2= *i;
			if (punto1.x!=-1)
				dlgDC.LineTo(punto2.x,punto2.x);
			dlgDC.MoveTo(punto2.x,punto2.y);
		}
	}
}

something is drawn, but not what i want, or what i've drawn with the mouse.
any ideas?
thanks!

Johan Rosengren5-Jun-04 22:15

Johan Rosengren

5-Jun-04 22:15

First of all, you are still drawing in the mousemove handler, which will not exactly make it easy for you to know what drawing works and what don't. Moreover, this code is leaking GDI-handles, as you don't unselect the pen you have created and selected. The paint handler, on the other hand, will use whatever pen happens to be selected into the CDC.

You are adding point twice to the list, which looks slightly odd. You seem to be moving to the current position, drawing backwards, and then forward again, is this really what you intended.

The OnPaint-handler is definitely odd as well - you are drawing and then moving?

I think you should get some pen and paper, and outline what you really want to do. Basically, when all prerequisits for drawing is fullfilled in OnMouseMove, just add the current point to the list. Invalidate and redraw the window as appropriate. Then, in OnPaint, create and select the pen you want to draw with. Set the initial position with MoveTo. Loop the list, and call LineTo for each point. Voilà!