whats wrong here

[nabeels786]

im trying out CString, just experimenting, and im going crazy. i've look at a couple of sites, and it's correct:

#include <cstring.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

void main(void){
	CString s1;

	s1= "hello";

	printf("%s",s1.Right(1));
}

The Errors:

--------------------Configuration: Cpp1 - Win32 Debug--------------------
Compiling...
Cpp1.cpp
C:\Nabeel\Projects\C++\gfxtest\Cpp1.cpp(7) : error C2065: 'CString' : undeclared identifier
C:\Nabeel\Projects\C++\gfxtest\Cpp1.cpp(7) : error C2146: syntax error : missing ';' before identifier 's1'
C:\Nabeel\Projects\C++\gfxtest\Cpp1.cpp(7) : error C2065: 's1' : undeclared identifier
C:\Nabeel\Projects\C++\gfxtest\Cpp1.cpp(8) : error C2146: syntax error : missing ';' before identifier 's2'
C:\Nabeel\Projects\C++\gfxtest\Cpp1.cpp(8) : error C2065: 's2' : undeclared identifier
C:\Nabeel\Projects\C++\gfxtest\Cpp1.cpp(8) : error C2228: left of '.Right' must have class/struct/union type
Error executing cl.exe.

Cpp1.exe - 6 error(s), 0 warning(s)

im going crazy over this!

then i tried converting to pointers, and still the same errors

[abdul]

Try declaring the included file as:

#include <cstring>
#include <string>
#include <stdio.h>
#include <stdlib.h>

[nabeels786]

still the same errors..

i think vc++ is on crack

[transcendental]

I don't think you can printf a CString.

printf() is meant for null terminated strings.

Meanwhile I am looking the MSDN docs for you.

[nabeels786]

thanks man,


i dont think thats the problem though., it says its missing a ';', when it isnt...and it says the vars aren't defined

[transcendental]

You can use CString only in a MFC app.

I think you can only use null terminated strings. I don't think string class in #include<string> provide extracting strings from a string. You got to do it(the extracting) yourself

Meanwhile you can wait patiently for someone to help.

Me no string expert.

[nabeels786]

only in an MFC app? darn...i dont know MFC yet...gotta start learnin more

--thanks for the help

[CornedBee]

I think you can use CString in console apps by creating a "console app that supports MFC" (in the VC++ wizard). This will add a lot of overhead though.
To use it with printf you would need to explicitely cast to LPCTSTR:

CString str("Hello, World!");
printf("%s", (LPCTSTR)str.Right(1));

[nabeels786]

yeah i made one that supports MFC and it worked.


ill try that other thingy later..mmm food

thanks

[parksie]

If you want to get a substring out of a C++ string, then use the .substr(...) method:

#include <iostream>
#include <string>

int main() {
    string x = "Hello there!";

    cout << x.substr(x.length() - 1, 1) << endl;

    return 0;
}

[nabeels786]

okiedokie..

i like my CString..it has the Left(), Right() and Mid() funcstions to make to happy

[parksie]

You can synthesise Left and Right simply enough, and Mid == substr

Anyway, why use CString when you can easily use string, and then you've got full standard library compatibility? For example, you can't do this with a CString:

cout << my_c_string << endl;

...without writing your own inserter.

[nabeels786]

do u have any tutorials? i'm willing to learn it...

thanks

[parksie]

What's to learn?

string x = "Hello";

string y = x + " " + "World!";

string z = string("This ") + x + " is an example";

For z, note that the first This needs to be inside a string constructor, otherwise when the compiler resolves the right hand side it tries to add two pointers together, which is illegal. Forcing it into a string makes it all resolve properly

And then you've got .substr, which is like Mid().

There's no "Format" like with CString, but you can synthesise it easily enough using vsnprintf. I don't have the code at work, but when I get home if you've replied by then I can send it.

[nabeels786]

well the string things i needed/wanted were like "Left", and "Right"

[parksie]

That's my point, they're simply applications of Mid or substr.

[nabeels786]

i was wondering though,

is there a tutorial? im playing around with string.h now..

[parksie]

Ah. string.h != string.

string.h contains the C string handling functions, which you're likely to need a tutorial for (or just look at the MSVC docs). string has the C++ Standard Library's string class, and that's pretty easy to use.

Actually, the MSVC docs have info on the string class as well - they tell you everything you need to know.