Re: how can i launch a programm before session openning - C / C++ / MFC Discussion Boards

Re: what's the difference between data() and c_str() of basic_string?

Nemanja Trifunovic12-Mar-06 4:42

Nemanja Trifunovic

12-Mar-06 4:42

The later is guaranteed to end with '\0'. The former is not.

My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.

Re: what's the difference between data() and c_str() of basic_string?

xjzhou12-Mar-06 5:01

xjzhou

12-Mar-06 5:01

I have tested them.

string str( "Hello world" );
char szTemp1[12], szTemp2[12];
strcpy(szTemp1, str.data());
strcpy(szTemp2, str.c_str());

when I view the memory, szTemp1 and szTemp2 have the same content,
and both of them end with '\0'.

// szTemp1: 48 65 6c 6c 6f 20 77 6f 72 6c 64 00
// szTemp2: 48 65 6c 6c 6f 20 77 6f 72 6c 64 00

Re: what's the difference between data() and c_str() of basic_string?

Nemanja Trifunovic12-Mar-06 6:08

Nemanja Trifunovic

12-Mar-06 6:08

ustclover wrote:
when I view the memory, szTemp1 and szTemp2 have the same content,
and both of them end with '\0'.

Note the word "guaranteed". The C++ Standard requires c_str to return a pointer to an array that ends with `\0`, and it does not require (nor forbid, for that matter) for data.

The implementation you tested obviously returns a pointer to the same piece of memory in both cases, but it is not necessarily the case for all implementations.

Also, have you tested the case when you have an empty string? c_str() would be guaranteed to return the pointer to `\0`. For data(), again it is implementation dependent, but I would be surprised if it returned the same thing.

My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.

Re: what's the difference between data() and c_str() of basic_string?

xjzhou14-Mar-06 4:53

xjzhou

14-Mar-06 4:53

I have tested the case for an empty string too. Though the result is same with the nonempty case, I have believed what you said is right. Thank you again Smile | :)

CBitmap

mehrdadov12-Mar-06 4:21

mehrdadov

12-Mar-06 4:21

Hello
I want to use SetBitmapbits function but I can,t I need a sample code or a Guidance
thanks

Agh

Re: CBitmap

xjzhou12-Mar-06 5:07

xjzhou

12-Mar-06 5:07

here is an article.
maybe it is some helpful to you Smile | :)

http://www.codeproject.com/bitmap/using_get_set_bitmapbits.asp[^]

how can i launch a programm before session openning

ss200612-Mar-06 2:54

ss2006

12-Mar-06 2:54

how can i launch a programm before session openning?

am

Re: how can i launch a programm before session openning

Ryan Binns12-Mar-06 17:22

Ryan Binns

12-Mar-06 17:22

I assume you mean before a user logs in. Write the program as a service, and install it to run automatically.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Windows Forms Linking - V C++.NET

luhfluh12-Mar-06 1:56

luhfluh

12-Mar-06 1:56

Hi all, I'm new to Visual C++. I have created my Forms for an application. How do i link the FOrms...so that on a click event, an existing form exits and a different Form loads. Please help. Tks

-- modified at 8:02 Sunday 12th March, 2006

Re: Windows Forms Linking - V C++.NET

Hamid_RT12-Mar-06 3:08

Hamid_RT

12-Mar-06 3:08

Do you use CDialog form?

Re: Windows Forms Linking - V C++.NET

luhfluh12-Mar-06 4:03

luhfluh

12-Mar-06 4:03

No the Forms were mostly from scratch. i know how to get a button event handler to work. But i dont know how to link that handler to "load" the next Form and destroy itself...

Fixed path for File Open/Save Dialog....

ibexcentral12-Mar-06 0:37

ibexcentral

12-Mar-06 0:37

Is it possible to fix the directory of the File Open/Save dialog and NOT allow the user to change it ?

For example:

c:\fixeddiretory

Re: Fixed path for File Open/Save Dialog....

Stober12-Mar-06 0:52

Stober

12-Mar-06 0:52

I guess your program could just ignore the path.

Re: Fixed path for File Open/Save Dialog....

Gary R. Wheeler12-Mar-06 2:24

Gary R. Wheeler

12-Mar-06 2:24

If you just want to let the user pick a file from a single directory, it might be better to just have your own dialog with a list that you populate yourself.

Software Zen: delete this;

Fold With Us![^]

GLUT main problem

amanoullah11-Mar-06 22:36

amanoullah

11-Mar-06 22:36

Hey guys! i wna use glut functions like glutMouseFunc or glutKeyboardFunc outside of the int main(int argc, char **argv). How can i do this??

Please help!!

AmanN

Re: GLUT main problem

Dominik Reichl12-Mar-06 1:36

Dominik Reichl

12-Mar-06 1:36

See two threads below.

Best regards
Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Adobe Distiller

Dr-Kuulun11-Mar-06 22:06

Dr-Kuulun

11-Mar-06 22:06

Hi,

I have a problem with the output of CBitmap images to Adobe Distiller. I can see my bitmap in the view and the preview. Printing is also fine. But the output into pdf does not work. Text and other graphics like lines or boxes works fine, only bitmaps are not visible.
Is there anybody with a solution in the world?

Greetings from Hannover, Germany

Markus

Dr-Kuulun

Re: Adobe Distiller

Dr-Kuulun11-Mar-06 22:10

Dr-Kuulun

11-Mar-06 22:10

I forgot my code:

CDC dc;
dc.CreateCompatibleDC(pDC);
CBitmap b;
b.LoadBitmap(IDB_BITMAP1);
dc.SelectObject(&b);
pDC->StretchBlt(100,100,200,200,&dc,0,0,48,48,SRCCOPY);
pDC->MoveTo(0,0);
pDC->LineTo(100,100);

The line is visible but not the bitmap.

Dr-Kuulun

Re: Adobe Distiller

Hamid_RT12-Mar-06 2:53

Hamid_RT

12-Mar-06 2:53

Hi Dr-Kuulun
I run your code and this work.
I enter CDC *pDC=GetDC(); that I dont find in your code

CDC dc;
CDC *pDC=GetDC();
dc.CreateCompatibleDC(pDC);
CBitmap b;
b.LoadBitmap(IDB_BITMAP1);
dc.SelectObject(&b);
pDC->StretchBlt(100,100,200,200,&dc,0,0,48,48,SRCCOPY);
pDC->MoveTo(0,0);
pDC->LineTo(100,100);

GLUT problem

amanoullah11-Mar-06 20:18

amanoullah

11-Mar-06 20:18

Hey guys!!

How can I use the following GLUT functions without having to include them in main(int argc, char **argv) ??

glutMouseFunc(Mouse);<br />
glutMotionFunc(MouseActiveMotion);<br />
glutPassiveMotionFunc(MousePassiveMotion);<br />
glutEntryFunc(MouseEntry);<br />
glutKeyboardFunc(NormalKeys);<br />
glutSpecialFunc(KeyInput);

I'm trying to implement a camera using GLUT but the thing is I have to use this inside an OpenGL window that ive integrated in MFC. I have a separate class for my camera functions like void CCAMERA::Mouse(int button, int state, int x, int y)

But the compiler wont let me do this:
glutMouseFunc(Mouse); or this glutMouseFunc(CCAMERA::Mouse); or even when I instantiate my class as Camera and do this: glutMouseFunc(Camera.Mouse); , it wont let me. Confused | :confused:

Please help!

Thanks in advance guys

Aman N

Re: GLUT problem

Jeremy Falcon11-Mar-06 20:43

Jeremy Falcon

11-Mar-06 20:43

You could always refer this article for an example of working with OpenGL in MFC...

http://www.codeproject.com/opengl/wrl_viewer.asp[^]

Jeremy Falcon

Re: GLUT problem

beko11-Mar-06 22:56

beko

11-Mar-06 22:56

Implement MouseMove in your view class
You might also need to implement WM_LBUTTONDOWN/UP etc.

Then you can call, your camera's methods from there.

There should be an example on the Internet for displaying MD3 files. Search in the gamedev articles. It shows how to set up a MFC project and create four different views(quite a useful article to look at in the beginning)

I found the link.

http://www.gamedev.net/reference/articles/article1358.asp

Bekir.

Identifying sequence point errors in VS6

Chintoo72311-Mar-06 19:30

Chintoo723

11-Mar-06 19:30

See http://c-faq.com/expr/evalorder1.html[^] and http://c-faq.com/expr/seqpoints.html[^].

a[i] = i++ is disallowed.

GCC has flags "gcc –Wsequence-point –Werror " to detect these errors,
can microsoft compiler detect this? I use Visual Studio 6. If the CL compiler in VS6 cannot detect it, how about VS2003 and VS2005?

thanks!

Re: Identifying sequence point errors in VS6

John R. Shaw11-Mar-06 21:32

John R. Shaw

11-Mar-06 21:32

I have not looked at the sights you provided, but that is not an error. A warning might not be a bad idea for that, but come on (it's legal code).

INTP
Every thing is relative...

Re: Identifying sequence point errors in VS6

Chintoo72312-Mar-06 0:51

Chintoo723

12-Mar-06 0:51

Is is actually disallowed in C as it can lead to undefined behaviour, see the two links I gave.
GCC takes a command line option to detect this as a warning.

thanks!

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