C / C++ / MFC Discussion Boards

Re: CString problem

Sunnygirl29-Jun-03 9:01

Sunnygirl

29-Jun-03 9:01

thanks for reply.

it works great!!!!

THANKS!!!!
sunny

Re: CString problem

FlyingDancer29-Jun-03 18:53

FlyingDancer

29-Jun-03 18:53

Can I convert a CString varible to (char *) type?
For example:
void fun(char * str)
{
....
}
CString str;
fun(????str)

What should be added to before "str"?

Re: CString problem

FlyingDancer29-Jun-03 19:06

FlyingDancer

29-Jun-03 19:06

Use "sprintf"?

Re: CString problem

Michael Dunn29-Jun-03 19:41

Michael Dunn

29-Jun-03 19:41

See the FAQ:
7.3 How do I convert a CString to a char*?[^]

--Mike--
"So where does that leave us? Well, it leaves us right back where we started, only more confused than before." -- Matt Gullett
Ericahist | Homepage | RightClick-Encrypt | 1ClickPicGrabber

Re: CString problem

FlyingDancer30-Jun-03 3:43

FlyingDancer

30-Jun-03 3:43

Thank you! Rose | [Rose]

A general solution

Trollslayer30-Jun-03 1:45

Trollslayer

30-Jun-03 1:45

When trying to find out this kind of thing, go to the help index and look at the class members. This provides a list of functions available for the class, saves a lot of time and you learn quite a bit in the process.

Elaine Rose | [Rose]

The tigress is here Big Grin | :-D

Problem using Flat Scroll Bars

miguel.lopes@lsi.pt29-Jun-03 7:03

miguel.lopes@lsi.pt

29-Jun-03 7:03

Hi. Im trying to get more control over a scroll bar from a ClistCtrl. I tried to use the "Flat Scroll Bars" from win SDK but they behave weird when i drag them. All the rest works fine, except from that weird behavior.
My code:

m_list=new CListCtrl();
m_list->Create(WS_BORDER | WS_VISIBLE | WS_CHILD | LVS_REPORT | LVS_SINGLESEL | LVS_NOCOLUMNHEADER, CRect(0,0,0,0),this,NULL);

::InitializeFlatSB(m_list->m_hWnd);
::FlatSB_ShowScrollBar(m_list->m_hWnd,SB_VERT,true);
::FlatSB_EnableScrollBar(m_list->m_hWnd,SB_BOTH,ESB_ENABLE_BOTH);
::FlatSB_SetScrollProp(m_list->m_hWnd,WSB_PROP_VSTYLE,FSB_FLAT_MODE,false);
::FlatSB_SetScrollProp(m_list->m_hWnd,WSB_PROP_CXVSCROLL,25,false);

Thanks in advance Smile | :)

Repeating socket connection

Anonymous29-Jun-03 3:20

Anonymous

29-Jun-03 3:20

My program needs to query a number of servers for data. I can do this by repeating the following:

for (each server)
{
Create socket
Connect socket to server
Close socket
}

What I want to do is use the same socket to connect to each server in turn so that I only have to create the socket once:

Create socket
for (each server)
{
Connect socket to server
Disconnect socket
}
Close socket

Is this possible? My socket is a CSocket.

Thanks

Re: Repeating socket connection

valikac29-Jun-03 6:24

valikac

29-Jun-03 6:24

No. It is possible, however, to recreate a new socket and assign it to the socket handle in the same object.

Kuphryn

Comparing BOOL values

Abin29-Jun-03 2:54

Abin

29-Jun-03 2:54

Sometimes I need to compare two boolean values, for example:

BOOL b1 = condition1();
BOOL b2 = condition2();

if (b1 == b2) // both TRUE or both FALSE
{
// something
}
else
{
// something else
}

Above code makes sense but actually I guess they are wrong, since BOOL's are actually INT's, while "false" is guaranteed to be "0", "true" is only guaranteed to be "non-zero" ---- in theory, it may or may not be "1", so even if b1 and b2 are both true, they don't necessarily equal to each other.
Although I can do this instead:

if ((b1 && b2) || (!b1 && !b2))
{
// something
}
else
{
// something else
}

This sure will work but looks ugly, my question is, how to compare two BOOL values in a way that the code works AND looks not ugly?

Re: Comparing BOOL values

Nick Parker29-Jun-03 2:58

Nick Parker

29-Jun-03 2:58

=[ Abin ]= wrote:
if ((b1 && b2) || (!b1 && !b2))

I don't think it looks that ugly, but you could always write a function to handle the comparison for you.

-Nick Parker

Re: Comparing BOOL values

Angel Kid29-Jun-03 3:00

Angel Kid

29-Jun-03 3:00

Maybe you can write your BOOL class and overload the operator "==".

YES, I am here.

Re: Comparing BOOL values

Tibor Blazko29-Jun-03 4:12

Tibor Blazko

29-Jun-03 4:12

(!b1) != (!b2)
looks better?
t!

Re: Comparing BOOL values

Ryan Binns29-Jun-03 4:31

Ryan Binns

29-Jun-03 4:31

I agree with Nick. If you think it looks ugly, write a function (make it inline for speed...). I don't think it looks ugly and is exactly what I would do.

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

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"

Re: Comparing BOOL values

Anonymous29-Jun-03 7:46

Anonymous

29-Jun-03 7:46

I think the == operator disregards the "non zero" value, just assums it like "1". If that happnes, "if (b1 == b2)" is absolutly correct

Re: Comparing BOOL values

Ravi Bhavnani29-Jun-03 8:39

Ravi Bhavnani

29-Jun-03 8:39

I don't think what you wrote is ugly. I'd only add an explicit comment before the if.

// Do "something" if b1 and b2 are both true or both false
if ((b1 && b2) || (!b1 && !b2)) {
   something;
} else {
   something else;
}

/ravi

Let's put "civil" back in "civilization"
Home | Articles | Freeware | Music
ravib@ravib.com

Re: Comparing BOOL values

Anders Molin29-Jun-03 9:48

Anders Molin

29-Jun-03 9:48

That's why I always use bool instead of BOOL Wink | ;)

- Anders

Money talks, but all mine ever says is "Goodbye!"

Re: Comparing BOOL values

Chris Richardson29-Jun-03 12:24

Chris Richardson

29-Jun-03 12:24

I would use bool, but I don't think the following code is all that bad:

// Now, if b1 or b2 is anything other than 0, it will become 0, otherwise it will become 1, so the <code>==</code> operator works as expected.
if( !b1 == !b2 )
{
   // Something.
}
else
{
   // Something else.
}

Chris Richardson
Terrain Software

CString::SetAt

Sunnygirl29-Jun-03 2:53

Sunnygirl

29-Jun-03 2:53

hello @all,

i want to fill a CString. i tried this:

hs1=0;<br />
CString m_strTest1;<br />
CString minus("-");<br />
m_strTest1.SetAt(hs1, 'minus');

but it does not work.
can anybody help me?

thanks,
sunny

Re: CString::SetAt

zeki yugnak29-Jun-03 3:52

zeki yugnak

29-Jun-03 3:52

hi...

you have made an error.

<br />
void SetAt(<br />
   int iChar,<br />
   XCHAR ch<br />
);

CString::SetAt can add only char.not word!!

what do you want to do?

Re: CString::SetAt

Abbas_Riazi29-Jun-03 3:55

Abbas_Riazi

29-Jun-03 3:55

What do you do?

Use this code for filling a CString variable:

CString var=_T("Hello World!");

Now, var filled with "Hello World!" string.

A. Riazi

Re: CString::SetAt

Ryan Binns29-Jun-03 4:34

Ryan Binns

29-Jun-03 4:34

Sunnygirl wrote:
m_strTest1.SetAt(hs1, 'minus');

SetAt() expects a character, not a string. You've given a string but encoded it as a character. This will spit out a compiler warning, and is not correct. Just do this;

CString m_strTest1;
m_strTest1 = "minus";

Hope this helps,

Ryan

Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2^nd April 2003, The Lounge)

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"

Re: CString::SetAt

MAAK29-Jun-03 11:41

MAAK

29-Jun-03 11:41

if you need to insert a string into certain position there is CString::Insert()

CString str;
str.Insert(0, "TEST");

Transmit files by Serial Ports

Angel Kid29-Jun-03 2:14

Angel Kid

29-Jun-03 2:14

Hi,I have a question when I was writing the program about serial communication.
It seems that most articles about serial communication are wrote to the characters transmission.But now I want to transmit files by serial ports,how could I do that.I mean "transmit files" is that copy files on a PC to another.
Is there anyone could give me a method to do that? Thanks very much.

YES, I am here.

Re: Transmit files by Serial Ports

Abbas_Riazi29-Jun-03 3:50

Abbas_Riazi

29-Jun-03 3:50

It's very simple. Read file character by character and send this character to another PC by your serial interface. Another PC read these character and save them on a new file!

This article[^] has a sample demo for transferring files by Serial Port!

A. Riazi

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