Alignment - C / C++ / MFC Discussion Boards

John M. Drescher13-Jul-03 15:57

13-Jul-03 15:57

Here is the link that you can click on:
http://www.codeproject.com/script/comments/forums.asp?msg=548929&forumid=1647#xx548929xx[^]

John

A simple C solution

eggie513-Jul-03 14:49

eggie5

13-Jul-03 14:49

How do I make a simple C solution in VS.NET??? just a C console application...

/\ |_ E X E GG

Re: A simple C solution

C^hris L^osinger13-Jul-03 16:42

C^hris L^osinger

13-Jul-03 16:42

doesn't look like there is a way.
maybe you could start with a C++ console app then take out the stuff you don't need, and add a .C file.

i needed to start a Win32 DLL in VS.Net last week. there's no way to do that either. so, i started on in VC6, then opened it in VS.Net.

-c

CheeseWeasle

Re: A simple C solution

Nick Parker13-Jul-03 19:15

Nick Parker

13-Jul-03 19:15

Chris Losinger wrote:
i needed to start a Win32 DLL in VS.Net last week. there's no way to do that either. so, i started on in VC6, then opened it in VS.Net.

Sounds like a hassle. Dead | X|

-Nick Parker

Re: A simple C solution

Joe Woodbury14-Jul-03 9:07

Joe Woodbury

14-Jul-03 9:07

First, I assume you mean a simple C++ console app. No reason to use C.

To do this in VC.NET 2003 (2002 will be similar):

Click File|New|Project.

Click on "Visual C++ Projects"

In the right hand list box, scroll down to "Win32 Console Project"

Enter the name and location in the appropriate spots and click "OK".

(You can also select "Win32 Project." When the wizard comes up, click on "Application Settings" on the left and then "Console Application", and any other options on the right.)

Wininet and php scripts

georgiek5013-Jul-03 13:03

georgiek50

13-Jul-03 13:03

I would like to write a short application using Wininet that interacts with search engines of websites that use php scripts and specifically the POST method to search their database. Where can I find some information concerning these topics?

Problem with AnimatePalette

BillA13-Jul-03 11:44

BillA

13-Jul-03 11:44

I'm having a problem using AnimatePalette. My application's main window is a CFrameWnd subclass with a CView subclass. The CView handles WM_PALETTECHANGED and WM_QUERYNEWPALETTE. All of the graphics in the view are done in child windows. These windows are all of a subclass of CWnd. All are transparent, as they are graphics overlaid on to frame-grabbed video displayed by the CView. Some of the overlaid graphics have to blink on and off, so the parent (CView) window calls SetTimer in its WM_CREATE handler and has a WM_TIMER handler which switches the blinking palette entries from the background color (black in this case) to the foreground color (green in this case) and back by using AnimatePalette. The child windows Select and Realize the palette in their WM_PAINT handlers. This all seems to work just fine.

I have blinking graphical entities in two of the child windows. If I hide one of the windows, the entities in the other window STOP blinking! If they were "off" (i.e. background color) when I hid the sibling window, they never come back "on" (i.e. foreground color) or if "on", they never go back "off" until I show the hidden sibling window again. (I've set up an WM_KEYUP handler to hide/show the child windows).

What am I doing wrong? My CPalette is a data member of the parent (CView) window. Each of the child (CWnd) windows has a data member which holds a pointer to the CPalette object in the parent.

Bill A.

Alignment

gregs13-Jul-03 9:18

gregs

13-Jul-03 9:18

I have been aligning(16 byte) certain data types to allow me to use SSE commands on them, and have no problems apart from when I create instances of them on the stack, where I get a runtime exception in debug mode, complaining about the stack being corrupted when I leave the function that uses it, ie

void SomeProc()<br />
{<br />
  Vector vec;  // the aligned type<br />
<br />
  // ..  do stuff with vector ..<br />
<br />
} // <- stack corrupted

so I'm having to do

void SomeProc()<br />
{<br />
  Vector *vec=new Vector;  // the aligned type<br />
<br />
  // ..  do stuff with vector ..<br />
<br />
  delete vec;<br />
<br />
} // okay

which is time consuming. I have implemented ways to speed it up, but I would like to know if there's a simpler way.

Thanks,
G

Re: Alignment

Joaquín M López Muñoz13-Jul-03 11:47

Joaquín M López Muñoz

13-Jul-03 11:47

AFAIK changing the default alignment for a structure mustn't cause stack corruption issues. Maybe if you post the code for SomeProc we can spot the root of the problem.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Alignment

gregs13-Jul-03 12:31

gregs

13-Jul-03 12:31

Right: the class vector is defined thus:

// alignment for SIMD instructions<br />
#define jALIGN	__declspec(align(16))<br />
<br />
// The m_vector data structure for optimisation<br />
typedef jALIGN struct VecData {<br />
				float x;<br />
				float y;<br />
				float z;<br />
				float w;<br />
			}VecData;<br />
<br />
class Vector {<br />
public:<br />
// stuff<br />
protected:<br />
	VecData m_vec;		// vector data<br />
};

and the test procedure is

Vector vec(1.0f,1.0f,1.0f,1.0f);<br />
Vector vans=mat1*vec;<br />
PVec(vans);

Where PVec just prints out the value of the vector.

mat1 is a matrix defined thus:

// the actual matrix type<br />
typedef float jALIGN jMat[16];<br />
<br />
class Matrix {<br />
public:<br />
// stuff<br />
protected:<br />
	jMat m_mat;<br />
};

and the transformation function for the non-SIMD version (it happens on all versions) is

Vector Matrix :: operator * (Vector &v)<br />
{<br />
	float x,y,z,w;		// temporary vector<br />
	float vx,vy,vz,vw;	// the parts of v<br />
<br />
	// get the parts of v<br />
	v.Get(vx,vy,vz,vw);<br />
<br />
	// transform vector<br />
	x=( vx*m_mat[jMatIdx(0,0)] ) +<br />
					( vy*m_mat[jMatIdx(1,0)] ) +<br />
					( vz*m_mat[jMatIdx(2,0)] ) +<br />
					( vw*m_mat[jMatIdx(3,0)] );<br />
	y=( vx*m_mat[jMatIdx(0,1)] ) +<br />
					( vy*m_mat[jMatIdx(1,1)] ) +<br />
					( vz*m_mat[jMatIdx(2,1)] ) +<br />
					( vw*m_mat[jMatIdx(3,1)] );<br />
	z=( vx*m_mat[jMatIdx(0,2)] ) +<br />
					( vy*m_mat[jMatIdx(1,2)] ) +<br />
					( vz*m_mat[jMatIdx(2,2)] ) +<br />
					( vw*m_mat[jMatIdx(3,2)] );<br />
	w=( vx*m_mat[jMatIdx(0,3)] ) +<br />
					( vy*m_mat[jMatIdx(1,3)] ) +<br />
					( vz*m_mat[jMatIdx(2,3)] ) +<br />
					( vw*m_mat[jMatIdx(3,3)] );<br />
<br />
	// tidy<br />
	x/=w;<br />
	y/=w;<br />
	z/=w;<br />
	w=1.0f;<br />
<br />
	// and return<br />
	return Vector(x,y,z);<br />
}

where jMatIdx is

// to get [x][y] capability without a multiplication<br />
#define jMatIdx(x,y)	( ((y)<<2) + (x) )

Hope this helps.

Re: Alignment

Joaquín M López Muñoz14-Jul-03 10:07

Joaquín M López Muñoz

14-Jul-03 10:07

Ummm... Everything seems fine. Where is jALIGN defined? Is it possible that "vector.h" (or whatever the name of the file where Vector is defined) could be #included in contexts where the definition of jALIGN differs?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Alignment

gregs14-Jul-03 10:32

gregs

14-Jul-03 10:32

No, it is defined in a single header file. For the moment, as I can't get around this, I have scrapped the alignment and just rewritten the SSE code, but it is annoying!

Web cam help

just_Albert13-Jul-03 8:59

just_Albert

13-Jul-03 8:59

hi I need to deal with a web cam So I need to know how to get data from it and wich format and how to display it but all I found in codeproject was done by C# and .NET but I need something in VC or some basic Ideas
thanks in Advanced

Re: Web cam help

Ted Ferenc13-Jul-03 9:31

Ted Ferenc

13-Jul-03 9:31

Try searching the MSDN for the example program vidcap.

If I have seen further it is by standing on the shoulders of Giants. - Isaac Newton 1676

Store SYSTEMTIME in registry - how?

Anonymous13-Jul-03 8:48

Anonymous

13-Jul-03 8:48

SYSTEMTIME structure looks like this:

typedef struct _SYSTEMTIME
{
WORD wYear;
WORD wMonth;
WORD wDayOfWeek;
WORD wDay;
WORD wHour;
WORD wMinute;
WORD wSecond;
WORD wMilliseconds;
} SYSTEMTIME;

I have a SYSTEMTIME object I want to store in the registry. What is the best way of doing this? Must I add each member to the registry or is there an easier (more elegant) way?

Thanks

Re: Store SYSTEMTIME in registry - how?

User 665813-Jul-03 8:55

User 6658

13-Jul-03 8:55

You might try to store it as a DWORD in the registry, but I'm not sure whether it works.

regards

modified 12-Sep-18 21:01pm.

Re: Store SYSTEMTIME in registry - how?

Anonymous13-Jul-03 10:28

Anonymous

13-Jul-03 10:28

I do not understand your "answer". I can convert the SYSTEMTIME structure of 8 WORDs into 4 DWORDS perhaps, then I only have 4 keys to store, yes? How would I get 2 separate WORDs from a DWORDs? One as a low value and the other as high value?

Re: Store SYSTEMTIME in registry - how?

User 665813-Jul-03 11:11

User 6658

13-Jul-03 11:11

Yes, that would work. There are two macros, LOWORD and HIWORD.
Or do it like Toni78 suggests, storing everything as a string.

modified 12-Sep-18 21:01pm.

Re: Store SYSTEMTIME in registry - how?

Toni7813-Jul-03 10:57

Toni78

13-Jul-03 10:57

Concatenate all of the data in one string and store it in the registry. That is if you don't want to save each member.
i.e.
CString strTime;
strTime.Format("%X-%X-%X", sysTime.wYear, sysTime.Month, sysTime.DayOfWeek );

This is just an idea and I have not tested it if it works. But I don't see a reason why it shouldn't.

// Afterall, I realized that even my comment lines have bugs

When one cannot invent, one must at least improve (in bed).-My latest fortune cookie

Re: Store SYSTEMTIME in registry - how?

PJ Arends13-Jul-03 13:59

PJ Arends

13-Jul-03 13:59

Save it as a binary value

CRegKey Key;
if (ERROR_SUCCESS == Key.Create(HKEY_CURRENT_USER, _T("Software\\My Company\\My App\\Settings"));
{
    ::RegSetValueEx(Key.m_hKey, _T("Time"), NULL, REG_BINARY, (LPBYTE)&MyTimeObject, sizeof(SYSTEMTIME));
}

To read it back again use the ::RegQueryValueEx() function

CRegKey Key;
if (ERROR_SUCCESS == Key.Open(HKEY_CURRENT_USER, _T("Software\\My Company\\My App\\Settings"));
{
    DWORD dw = sizeof(SYSTEMTIME);
    ::RegQueryValueEx(Key.m_hKey, _T("Time"), NULL, NULL, (LPBYTE)&MyTimeObject, &dw);
}

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!

Re: Store SYSTEMTIME in registry - how?

Anonymous14-Jul-03 5:12

Anonymous

14-Jul-03 5:12

Awesome! Thanks m8 Smile | :)

Re: Store SYSTEMTIME in registry - how?

Toni7814-Jul-03 20:09

Toni78

14-Jul-03 20:09

WOW!!! I could never find a reason to use REG_BINARY.

// Afterall, I realized that even my comment lines have bugs

When one cannot invent, one must at least improve (in bed).-My latest fortune cookie

adding a color list box in a dialog MFC

mcguile25713-Jul-03 7:31

mcguile257

13-Jul-03 7:31

How do I add one of those cool list boxes that allow you to pick a color in the dialog box. I know how to add a list box to a dialog, but not how to add the color part to it.

PS -- I'm not talking about CColorDialog, I want to know how to be able to pick a color inside the dialog list box.

Re: adding a color list box in a dialog MFC

adamUK13-Jul-03 11:43

adamUK

13-Jul-03 11:43

See http://www.codeproject.com/combobox/colorpicker.asp?target=owner%7Cdraw%7Clist%7Cbox[^] in CP.

Owner drawn list/combo boxes are the way forward.

Hope this helps,

Adam.

My world tour
What I do now..

"I spent a lot of my money on booze, birds and fast cars. The rest I just squandered"
George Best.

"I suppose if it was a choice between bon jovi and the interior of a car, the car would win, even it didnt have a radio and I had to sit in silence" James Simpson on Light Metal.

CDC::DrawText() vs TextOur()

adamUK13-Jul-03 7:02

adamUK

13-Jul-03 7:02

I am drawing directly on to a dialog and for some reason in the OnPaint() handler, if I use TextOut, text draws okay. If I replace the statement with DrawText() nothing appears. This is with DT_NOCLIP|DT_CALCRECT|DT_SINGLELINE as options. It is me or is there something deeper afoot? I am using W2K SP3 and VC6.

thanks

Adam.

My world tour
What I do now..

"I spent a lot of my money on booze, birds and fast cars. The rest I just squandered"
George Best.

"I suppose if it was a choice between bon jovi and the interior of a car, the car would win, even it didnt have a radio and I had to sit in silence" James Simpson on Light Metal.

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