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john5632 wrote: I design another application that will keep watching memeory usage of that application in every 5 second.
If Memeory usage is equal to last 5 second. I assumes application has been loaded.
You can't seriously think this is a good idea.  "One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Man who follows car will be exhausted." - Confucius
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Hello,
Ok, here's the (very simplified) code that's been causing me headaches :
double f = numeric_limits<double>::quiet_NaN ();
int n = (f == numeric_limits<double>::quiet_NaN ());
Can someone *please* explain why n is always 0 here??
After the second line is executed, the debugger shows:
std::numeric_limits<double>::quiet_NaN returned 1.#QNAN00000000000 double
f 1.#QNAN00000000000 double
In case this is some kind of processor issue, I'll should also mention that I'm using VC++ 2005 on an AMD Turion 64 running Windows XP.
Thx !
Sly
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if you have condition of exceptipon say a
case of divide by zero of double then you get this value 1.#QNAN00000000000.
Where NAN represents Not a Number([^])
Now in this case of divide by zero
double numerator = 0;
double denominator = 0;
double d = static_cast<double>(numerator)/static_cast<double>(denominator);
value of d is not infinite, but it cannot be calculated, so it given as NaN.
well about the second line
int n = (f == numeric_limits<double>::quiet_NaN ());
the value of n is compiler dependent so it will change accordingly.
for Vs 2005 it may be 0 for some other earlier versions it may be 1.Величие не Бога может быть недооценена.
modified on Thursday, March 4, 2010 6:31 AM
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See [^]:
A comparison with a NaN always returns an unordered result even when comparing with itself. The comparison predicates are either signaling or non-signaling, the signaling versions signal an invalid exception for such comparisons. The equality and inequality predicates are non-signaling so x = x returning false can be used to test if x is a quiet NaN. The other standard comparison predicates all signal if they receive a NaN operand, the standard also provides non-signaling versions of these other predicates. The predicate isNaN(x) determines if a value is a NaN and never signals an exception.
 If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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Thanks to the both of you for the explanation!
I ending up changing all the relevant code to use isnan(f) instead of direct comparisons and everything works fine now but I was still wondering why a direct comparison with a NaN always returned 0 on my compiler.
Now I understand!
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Hi
Please guide me How to design OSI layer using C++/VC++ ..For Example if i send raw bits in network layer i need to find the status of raw bits in each layer ..how to do that sir...please Guide me!
Thanks   Failure is Success If we learn from it!!
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Please read point 2 here[^]
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Hai All..
I need to encode and decode some popular video formats listed below.
Input: avi, mpeg2, mpeg4, h.264, mov, flv, VMW
output: On2VP6 and h.264 avc
I tried with FFMPEG project. But there is only decoding for On2VP6 and H264(Encoding not supported). Is there any library availabe for this purpose? or which is the good way i can go...?Please let me know your valuable suggestions...
Regards,
Rajeev K R
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| Take a look at DirectShow[^] for instance. > The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <
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Thanks for your reply  ... But it will take more time to develope an encoding application from the scratch using DShow. Unfortunately it is an urgent requirement for me in my current project. I am looking for Encoding and Decoding libraries just like FFMPEG.
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Thank You Rejeesh for your quick response...
I tried the above link. But Hdot264 video codec supports only H264 format. I need to encode both On2VP6 and h.264 avc.
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Hopefully you would find some On2VP6 codecs as well if you google it.
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I got some paid libraries. But no free libs...Still trying for a best one... 
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Hi,
How to get HWND of dialog box in win32 applucation?
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Depends where the dialog box comes from.
If you created a dialog box using CreateDialog, the function returns the handle you are looking for.
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You should post a more specific question.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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If you create a dialog (win32) with :
HWND CreateDialog( HINSTANCE hInstance, LPCTSTR lpTemplate, HWND hWndParent, DLGPROC lpDialogFunc );<br />
The HWND of the dialog will be the returned value of the function.
or maybe I do not understand the question.Watched code never compiles.
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Hi all,
I have a code in an applicaiton that I use in many dialogs to display a grayscale data into a color image (using pseudo colors) as follows-
LONG DIBSecWidth;
LONG DIBSecHeight;
LONG BitsPerPixel;
LONG Stride;
BITMAPINFO bmi;
BYTE *pDIBSectionBits;
HBITMAP hbm;
DIBSecWidth = 512;
DIBSecHeight = 512;
BitsPerPixel = 24;
m_bData = VBI_vector(row*col);
Stride = ((DIBSecWidth * BitsPerPixel + 31L) & (~31L)) / 8L;
memset(&bmi, 0, sizeof(BITMAPINFO));
bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi.bmiHeader.biWidth = DIBSecWidth;
bmi.bmiHeader.biHeight = DIBSecHeight;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = (WORD)BitsPerPixel;
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biSizeImage = Stride * abs(DIBSecHeight);
hbm = ::CreateDIBSection(NULL, &bmi, DIB_RGB_COLORS, (void**)&pDIBSectionBits, NULL, 0);
memDC.CreateCompatibleDC(NULL);
colormap = new COLORREF[256];
int red, blue, green;
for (int i=1; i<257; ++i)
{
red = (int)(((1+cos((4*PI*double(i))/(3*255)))/2)*255);
green = (int)(((1+cos((4*PI*double(i)/(3*255))-(2*PI/3)))/2)*255);
blue = (int)(((1+cos((4*PI*double(i)/(3*255))-(4*PI/3)))/2)*255);
colormap[256-i] = RGB(red,green,blue);
}
CDC *dc = Display->GetDC();
HGDIOBJ holdbm;
BYTE color;
short idx;
RGBTRIPLE *pCurRowPixel = (RGBTRIPLE *)(pDIBSectionBits);
short i=-1;
for (int y = 0; y < 512; ++y)
{
for (int x = 0; x < 512; ++x)
{
color = (BYTE) m_dDatatemp[++i];
pCurRowPixel[x].rgbtBlue = GetBValue(colormap[color]);
pCurRowPixel[x].rgbtGreen = GetGValue(colormap[color]);
pCurRowPixel[x].rgbtRed = GetRValue(colormap[color]);
}
pCurRowPixel = (RGBTRIPLE *)((BYTE*)pCurRowPixel + Stride);
}
holdbm = memDC.SelectObject(hbm);
dc->BitBlt(align_left, align_top, bmi.bmiHeader.biWidth, bmi.bmiHeader.biHeight,&memDC,0,0,SRCCOPY);
memDC.SelectObject(holdbm);
ReleaseDC(dc);
Now I would like to save pDIBSectionBits(or to say the color image being displayed on the dialog) into an avi file. Any ideas or suggestions are really appreciated.
thanks in advance,PKNT
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Have a look at the Microsoft Windows SDK WriteAVI sample - this does what you are trying to do.
I used this WriteAVI sample code (with the assistance of CodeProject members) to save a set of images as a video clip 5 or 6 years ago, so the details are fuzzy. If you have specific issues, I can find a copy of the code and try to do an extract.
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Hello,
I have a basic grasp of c/c++ after doing several books and many tutorials but am having trouble making the next step.
Specifically I would like to learn how to do image manipulation. I understand how a RAW image file is formated but I have no idea how on earth to handle the mass of data or how to do for example edge detection. Can anyone recommended a place I can go to learn or an example on this site I can dissect and learn well?
The second thing is how to make good menus. I can easily make a hardcoded menu but when I want to add one new feature I must write quite a bit of code. I have heard that a state machine is a great way to do it. You can add your new menu into a 'choice matrix' or something but I never understood how to actually make them. Is their a better way to do menus? And can you recommended a good state machine tutorial?
Thanks!
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| You didn't really say whether you wanted to learn image processing from the ground up or simple experiment with image processing. Another well supported and Open Source image processing and machine vision library is OpenCV[^]. It was orininally started by Intel and now actively supported by Willow Garage. It was originally written with a pure C API but they've been retrofitting a C++ interface lately. Lots of samples and extensions available, an active user community, and a book from O'Reilly for documentation. You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.
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