Appending many wchar_t

[Guest]

Hi,
I am not so experienced yet in cpp, coming from pascal/delphi.
I have some problems with the wchar_t

if I have some of them, for example:

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wchar_t* char1 = L"BlablaBla";
wchar_t* char2 = L"BlubBlubBlub";
wchar_t* char3 = L"BloBloBlo";

And then I want to add these three as a parameter to, for example, guienv->addStaticText(...);

In Pascal I wrote

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guienv->addStaticText(char1+char2+char3,[...]);

In cpp this doesn´t work.

I wonder how I do this in cpp. I would be glad if anybody could help me.
thx in advance!
[/code]

[keless]

wchar_t* acts similarly to char*

as C/C++ is very basic, it does not support fluid string types, or dynamic arrays, hashed arrays, etc. However classes that offer this functionality are often supplied.

for typical char*, you can use std::string which provides operator overloading for functionality such as what you described (ie: str1 = str2+str3 )

std::string uses char* internally however, and you want to use wchar_t

for this purpose, Niko has coded his own string class which is a template. you can make an irr::core::string<wchar_t>, which will provide the functionality you are looking for.

for instances that require a wchar_t*, use the c_str() method to extract a pointer to your string

[Guest]

It works perfectly. Thx for your help. Only one question is remaining

I have now:

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[...]
string<wchar_t> string1 = "String1";
string<wchar_t> string2 = "String2";
string<wchar_t> string3 = "String3";
[...]

Later I have another string, I want to add the first three strings and insert some words manually, so it would look like:

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string<wchar_t> charNew = "These are all Strings: "+string1+string2+string3;

This wont work because "These are all Strings: " is no string, of course. But how can I make a "Just-In-Time" String without having a new Object. I would not look nice if I would write:

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string<wchar_t> temp = "These are all Strings: ";
string<wchar_t> charNew = temp+string1+string2+string3;

Thank you for your help!

[mq]

btw: I am mq, thaught I was logged in

[mq]

Does nobody know how to create "Just-In-Time"-Strings? I would search in google but what should I look for? "Just-In-Time object creation"?
I would be glad if anybody could just post one line of code

thx in advance,
mq

[keless]

the reason it doesnt work is because you're not using a wchar_t static string--
"string<wchar_t> temp = "These are all Strings: "; " that wont event work, you need to put the "L" in front of your string to make it a static wchar_t

ex:
string<wchar_t> charNew = L"These are all Strings: "+string1+string2+string3;

The L there is a pre-compile macro which tells the compiler that the static string next to it is a wide character string. so:
"this string is a static 'char' string"
L"this string is a static 'wchar_t' string"

[mq]

Thx for your answer, but I tested it with and without a "L" and both don´t work.

string<wchar_t> string1 = L"String1"; //with or without L, both dont work
string<wchar_t> string2 = L"String2"; //with or without L, both dont work
string<wchar_t> string3 = L"String3"; //with or without L, both dont work
string<wchar_t> charNew = L"These are all Strings: "+string1+string2+string3; //with or without L, both dont work

The error is:
main.cpp(73): error C2677: Binärer Operator '+' : Es konnte kein globaler Operator gefunden werden, der den Typ 'irr::core::string<T>' akzeptiert (oder keine geeignete Konvertierung möglich)
with
[
T=wchar_t
]
(binary '+' operator: There is no global operator that supports the type 'irr::core::string<T>' (or there is no conversion possible)

thx and regards,
mq

[keless]

hrm. string<wchar_t*> maybe? though that doesnt seem right..

otherwise, you can just create one on the spot:
string<wchar_t> blah = string<wchar_t>("blah blah blah...");
blah = blah + string<wchar_t>(" and more blah\n");

i think that'd work

[mq]

Yeah the 2nd possibility is working very well. I thank you very much
Best regards,
mq