C / C++ / MFC

23-May-08 23:24

Following is what I am doing...

string str1="true";
string str2="false";
bool str;

I want to assign the values to str by taking 'true' or false' from str1 or str2. When I do..
str=str1; or str=str2;
this does not work and shows an error. Is there any other alternative to this.

THANKS

CPallini24-May-08 0:07

CPallini

24-May-08 0:07

string str1="true";
string str2="false";
bool b;
b = str1 == "true" ? true : false;
b = str1 == "true";

[added]
modified according to Jijo Ray [^] observation.
[/added]

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

Mukesh Kumar24-May-08 0:12

Mukesh Kumar

24-May-08 0:12

if you can.... Smile | :)

do this:

if(str1=="true")<br />
str=1;<br />
if(str2=="false")<br />
str=0;<br />

Mukesh Kumar
Software Engineer

pl_kode24-May-08 0:16

24-May-08 0:16

on doing that I get the following.

error C2664: '__thiscall std::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >::std::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >(const cla
ss std::allocator<char> &)' : cannot convert parameter 1 from 'bool' to 'const class std::allocator<char> &'
Reason: cannot convert from 'bool' to 'const class std::allocator<char>'
No constructor could take the source type, or constructor overload resolution was ambiguous

I get the same even if I do the way Pallini said. Frown | :(

pl_kode24-May-08 0:19

24-May-08 0:19

I got it correct. THANKS..
Wink | ;)

Mukesh Kumar24-May-08 0:24

Mukesh Kumar

24-May-08 0:24

Thank God

Mukesh Kumar
Software Engineer

Jijo.Raj24-May-08 0:54

Jijo.Raj

24-May-08 0:54

A bit more tuned one.

string str1="true";
string str2="false";
bool str;

// The == operator already return bool.
str = str1 == "true";

Thanks & Regards,
Jijo.

________________________________

http://weseetips.com - Visual C++ technical tips.

CPallini24-May-08 2:09

CPallini

24-May-08 2:09

Jijo raj wrote:
// The == operator already return bool.

Good point, you're right.
Smile | :)

Any way to display the "square meter" within a string?

Jijo.Raj24-May-08 2:36

Jijo.Raj

24-May-08 2:36

Thanks Pallini. Smile | :)

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

followait23-May-08 21:52

Re: Any way to display the "square meter" within a string?

23-May-08 21:52

like this:

|\   /| 2
| \ / |
|  V  |

Garth J Lancaster23-May-08 22:05

Garth J Lancaster

23-May-08 22:05

not really sure I know what you're asking ...

a 'string' is just a sequence of characters - to display/render that string as output you could use a RTF text control or similar - then you might either be able to display a superscript character if there's any char-sets that support it, or use font-size properties, ie a big-font and a little font

you could look at something like http://www.codeproject.com/KB/static/xhtmlstatic.aspx[^]

for example, in which case your string is

"M<SUP> 2 </SUP > "

just had another thought, again, it depends on what you're doing with this string of characters. But you could use "M^2" where the understanding is that '^' means to the power of ..

'g'

Re: Any way to display the "square meter" within a string?

followait23-May-08 23:35

Re: Any way to display the "square meter" within a string?

23-May-08 23:35

Can I encode it in a CString object?

Michael Schubert23-May-08 22:23

Michael Schubert

23-May-08 22:23

Like this: "m²" ?

Use charmap.exe to get the superscript "2".

Re: Any way to display the "square meter" within a string?

followait23-May-08 23:34

Re: Any way to display the "square meter" within a string? [modified]

23-May-08 23:34

Yes, can't encode it in a CString object?

I tried to copy m² to my program, it doesn't work, coz the source file is not unicode, and the project's compilation option is for string is MBCS.

Michael Schubert24-May-08 0:19

Michael Schubert

24-May-08 0:19

OK, try this:

CString str = _T("m\xB2");

Edit: I just realised that this only works for CP1252 locale (English, German, French, etc.).

modified on Saturday, May 24, 2008 7:03 AM

Re: Any way to display the "square meter" within a string?

followait25-May-08 6:12

Re: Any way to display the "square meter" within a string?

25-May-08 6:12

Thanks very much.
It's done, my app is unicode.

Rajkumar R24-May-08 5:36

Rajkumar R

24-May-08 5:36

you can draw the string appropriate to achieve it, may this one helpful [Extended version of ExtTextOut supporting the subscripts and superscripts
^]

Renaming a file

pl_kode23-May-08 21:14

23-May-08 21:14

I have two strings and I do the following...

string old_path; // this is like C:\\folder\\file.txt
string new_path; // this is like C:\\folder\\file1.txt

rename(old_path_newpath)

Doing this I get the following error. How do I overcome this error.

error C2664: 'rename' : cannot convert parameter 1 from 'class std::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >' to 'const char *'
        No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
</char></char,struct>

THANKS

Garth J Lancaster23-May-08 21:30

Garth J Lancaster

23-May-08 21:30

try :-

rename(old_path.c_str(), new_path.c_str() );

notice the c_str() - that effectively gives you a const char * from the string

Im presuming rename(old_path_newpath) was a typo ..

'g'

Hamid_RT23-May-08 22:06

Hamid_RT

23-May-08 22:06

Except this error you can use of SHFileOperation instead rename.

Garth J Lancaster23-May-08 22:11

Garth J Lancaster

23-May-08 22:11

if he cant figure out how to use a relatively simple API like rename(), do you honestly think he's going to be able to figure out SHFileOperation ?

I dont think so ...

(even I use a wrapper class around SHFileOperation to make it simpler)

'g'