C / C++ / MFC

Andy20218-Sep-07 4:29

Andy202

18-Sep-07 4:29

OK David thanks you.

But next stupid question, my previous program worked OK.

Has new system files for thw environment been dowloaded?

David Crow18-Sep-07 4:34

David Crow

18-Sep-07 4:34

With VS6, ANSI is the default. With VS200x, Unicode is the default.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Andy20218-Sep-07 4:59

Andy202

18-Sep-07 4:59

Thanks again David.

Just one final question.

When ever I create a control variable, it takes about 4 minutes. I think all PCs on the network are being accessed. I cannot find a setting to limit this activity.

Many thanks,

Andy.

David Crow18-Sep-07 5:14

David Crow

18-Sep-07 5:14

Andy202 wrote:
When ever I create a control variable, it takes about 4 minutes.

Within the IDE?

Andy202 wrote:
When ever I create a control variable...I think all PCs on the network are being accessed.

I'm not aware of any correlation between the two. Does unplugging the network cable have an effect?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Iain Clarke, Warrior Programmer

Andy20218-Sep-07 6:10

Andy202

18-Sep-07 6:10

Yes, works OK with the cable unplugged.

and it is within the IDE.

Printing Problem

pri_skit18-Sep-07 1:40

pri_skit

18-Sep-07 1:40

I am using MM_TEXT mode during Ondraw(CDC *pDC) function & displayed a rectangle but during printing i am using MM_TWIPS mapmode now i want to use CoOrdinate used during Ondraw.I tried to convert Co-ordnate into correct pixels. Here is code:
// during On draw
pDC->MoveTo(p1);
pDC->LineTo(p2);
pDC->LineTo(p3);
pDC->LineTo(p4);
pDC->LineTo(p1);

// some macro
#define CalibPoint(p, HorPix,VerPix) CPoint(CALIBX(p.x,HorPix),CALIBY(p.y,VerPix))
#define CALIBX(point,HPIX) (point * HPIX )/PIXPERINCH
#define CALIBY(point,VPIX) (point * VPIX )/PIXPERINCH
#define PIXPERINCH 72

int nHorz = pDC->GetDeviceCaps(LOGPIXELSX);
int nVert = pDC->GetDeviceCaps(LOGPIXELSY);

//during printing
p1=CalibPoint(p1, nHorz,nVert);//CalibPoint is Macro
p2=CalibPoint(p2, nHorz,nVert);
p3=CalibPoint(p3, nHorz,nVert);
p4=CalibPoint(p4, nHorz,nVert);

pDC->MoveTo(p1.x,-p1.y);
pDC->LineTo(p2.x,-p2.y);
pDC->LineTo(p3.x,-p3.y);
pDC->LineTo(p4.x,-p4.y);
pDC->LineTo(p1.x,-p1.y);

Thanks & regards
priyank Dwivedi

priyank

Use MFC in....

himuskanhere18-Sep-07 1:36

himuskanhere

18-Sep-07 1:36

Whats the difference between
Use Mfc in Static Library and
Use Mfc in Shared Dll.

what is achieved after specifing either of thses two?

Thanks in advance....
Cool | :cool:

Re: Use MFC in....

nbugalia18-Sep-07 1:41

nbugalia

18-Sep-07 1:41

The shared dll option will use the existing mfc dlls on the machine on which execution is going on. If you don't have the dlls it wont' execute.

The static library option will attach the code of mfc dlls in you executable so you will not need the dlls.

But the drawback of static linking is that the overall size of executable will be increased.

Re: Use MFC in....

Iain Clarke, Warrior Programmer18-Sep-07 1:46

18-Sep-07 1:46

While the static library name may be hard to understand, the "shared dll" bit should be easier!

An EXE is the program you're running. It can also use DLLs, which other EXEs can use - hence shared DLLs. If you're struggling with that idea, then this is not the right forum for you.

In this case, your program will reference the MFC DLL(s). This could be MFC42U.dll for example. But this may or may not be on a system, so you'd need to put it there - and what if a bad person overwrites it? And is it will contain every MFC class and code, it will be quite large.

The alternative is to link all the MFC functions into your EXE. It will now be larger than before, but more selfcontained. And not as large as the EXE and DLL were before.

Which you use is heaviliy dependent on other conditions. Ease of install, whether the DLLs already exist on the system (which is a given with older versions of MFC). Will this be downloaded over a slow internet connection? etc.

There is no black or white, good or bad answer. Welcome to programming - land of compromises and cost-benefit analysis.

Iain.

Re: Use MFC in....

ddspliting18-Sep-07 7:35

ddspliting

18-Sep-07 7:35

i would use shared DLL usually but the main problem which i faced as an AMATUER programmer was tht my program wont run on my friend system! so static DLL helped me out! though the size of the exe incresed to few MBytes but atleast i got STANDALONE application Poke tongue | ;-P

conversion from double to float

KASR118-Sep-07 1:10

KASR1

18-Sep-07 1:10

How to convert double value to float value.
please look at the following code

double dDoubleValue = 200.55000000.
float fFloatValue = (float)dDoubleValue;

output will be 200.54999999, but i need exact value 200.55000000.

image processing toolkits | batch image processing

C^hris L^osinger18-Sep-07 1:24

C^hris L^osinger

18-Sep-07 1:24

Sakthi_Vel wrote:
but i need exact value 200.55000000

floating point numbers are never exact.

nbugalia18-Sep-07 2:11

nbugalia

18-Sep-07 2:11

You can use FLT_EPSILON.
For more information visit here[^]

Russell^'18-Sep-07 2:17

18-Sep-07 2:17

round it when you are showing the value.

Russell

Nelek18-Sep-07 3:48

Nelek

18-Sep-07 3:48

As by drawing with a "big" point Wink | ;)

:P ??

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Help me to understand what I'm saying, and I'll explain it better to you

Wink | ;)

Russell^'18-Sep-07 4:07

18-Sep-07 4:07

Here[^] you will need a very BIG point!
Laugh | :laugh:

Russell

Mike Dimmick18-Sep-07 4:30

Mike Dimmick

18-Sep-07 4:30

What Every Computer Scientist Should Know About Floating-Point Arithmetic[^].

See also this post[^] of mine about rounding in SQL Server.

If you need an exact decimal, perhaps for currency values, use a scaled integer. These are harder to find in C++, there's no standard implementation as far as I know, but basically treating an integer as if it were in cents rather than dollars, or pence rather than pounds, generally works pretty well.

Stability. What an interesting concept. -- Chris Maunder

KASR118-Sep-07 17:56

KASR1

18-Sep-07 17:56

so there is no way to convert in c++ as of explanation Wink | ;)

;)

adding directory structure tree in a tree control in mfc

David Crow19-Sep-07 2:39

David Crow

19-Sep-07 2:39

Had you read up on how floating-point numbers are stored/represented on a binary computer, you'd already know the answer to your question.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Dhiraj kumar Saini18-Sep-07 0:36

Dhiraj kumar Saini

18-Sep-07 0:36

I want to initialize my tree control with system directory tree in OnInitdialog function so that i can select my folder.
Remember I am working in mfc.

please help me.

Dhiraj

Dhiraj Kumar Saini

Re: adding directory structure tree in a tree control in mfc

Russell^'18-Sep-07 1:02

Re: adding directory structure tree in a tree control in mfc

18-Sep-07 1:02

like this[^]?
Smile | :)

Russell

Dhiraj kumar Saini18-Sep-07 2:02

Dhiraj kumar Saini

18-Sep-07 2:02

I have used the code with the link but it is giving error.

Can u give ne another link or code

i know its simple but not able to do it.

Thanks In advance.

Dhiraj

Re: adding directory structure tree in a tree control in mfc

Russell^'18-Sep-07 2:13