Re: what's the difference between data() and c_str() of basic_string? - C / C++ / MFC Discussion Boards

Re: Browse network neighborhood

Ryan Binns13-Mar-06 3:41

Ryan Binns

13-Mar-06 3:41

You're welcome Smile | :)

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"

crystal reports 11

aguest12-Mar-06 5:29

aguest

12-Mar-06 5:29

hi i got a problem in installing crystal reports 11 it request a file called keycode.dll.
can u help me ?

notification to parent

Tarek Jabri12-Mar-06 5:07

Tarek Jabri

12-Mar-06 5:07

Hi I am drawing on a dialog that is a child for other dialog
in the child dialog am handling the right click event ,in this handling and at certain condition i need to notify the parent dialog that a click happend at the child dialog?

any help is appreciated
thanks alot

Re: notification to parent

PJ Arends12-Mar-06 9:44

PJ Arends

12-Mar-06 9:44

Tarek Jabri wrote:
i need to notify the parent dialog that a click happend at the child dialog?

You can use SendMessage to send a user defined message from the child dialog to the parent dialog.

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good - Use it!

CBitmap

BabyGuru12-Mar-06 5:00

BabyGuru

12-Mar-06 5:00

Help !

I'm looking for the reverse API of LoadBitmap.
where can i find a function, or an implementation
who takes a CBitmap object and pushing/adding
it back to the resource....
resource of some other(not running)program.

i want to create RT_BITMAP resources dynamically.

10x in advanced.
me.

Re: CBitmap

PJ Arends12-Mar-06 9:23

PJ Arends

12-Mar-06 9:23

Have a look at the UpdateResource API.

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good - Use it!

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

xjzhou12-Mar-06 4:29

xjzhou

12-Mar-06 4:29

The followings are there declaration:
const value_type *data( ) const;
const value_type *c_str( ) const;

but I thank they have the same use.

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

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