String to char*

[Maciej]

Hallo,

Can I convert type String to char* ??
I need to use fstream in my application together with openfiledialog.

Thanks,

Maciek

 

[Leon Mergen]

Can I convert type String to char* ??
I need to use fstream in my application together with openfiledialog.

std::string foo = "bar";
char * wombat = strdup ( foo.c_str() );

Regards,

Leon Mergen

 

[Maciej]

I mean the String Class not a std::string.

Regards,

Maciek

 

[Alan Johnson]

I mean the String Class not a std::string.

Regards,

Maciek

(Reordered to undo top-posting.)

std::string and std::wstring are the only string classes provided by
standard C++.

-Alan

 

[Karl Heinz Buchegger]

I mean the String Class not a std::string.

1) Please don't top post.
Put your reply beneath the text you are replying to

2) the String Class in C++ *is* std::string
There is no other String Class in standard C++.
If you use some other class, please ask the creators of that
class how to do it, or post to a newsgroup where that class is topical.

 

[Torsten Mueller]

I mean the String Class not a std::string.

I've seen about 20 different String classes in my live. How about
looking into the list of methods of this class?

T.M.

 

[Maciej]

1) my mistake, sorry

I want to write a simple application using openfiledialog, and fstream.
I am not able to convert openfiledialog->filename to use it in open()
function of fstream. Filename is .net framework library String Class (MS
Visual Studio .Net).

Regards,

Maciek

 

[Maciej]

I have tried msdn.com, but it is very hard for me to find a relevant
function.

Maciek

 

[Rolf Magnus]

Please don't top-post. Fixed.

I mean the String Class not a std::string.

std::string is C++'s string class. There is no class called "String" in
standard C++. If you're using some other library that provides such a
class, you better look into that library's documentation or ask in a
newsgroup where that library is topical.

 

[benben]

I want to write a simple application using openfiledialog, and fstream.

I am not able to convert openfiledialog->filename to use it in open()
function of fstream. Filename is .net framework library String Class (MS
Visual Studio .Net).

Try System::String::ToCharArray()

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/
frlrfsystemstringclasstochararraytopic.asp

 

[Maciej]

Form1.h(79): error C2664: 'void
std::basic_ifstream<_Elem,_Traits>:pen(const char
*,std::_Iosb<_Dummy>:penmode,int)' : cannot convert parameter 1 from
'__wchar_t __gc[]' to 'const char *'
with
[
_Elem=char,
_Traits=std::char_traits<char>,
_Dummy=int
]

Not working. Unfortunately.

 

[benben]

Well, String.ToCharArray returns a System.Char[], which is almost equivalent
to the build in wchar_t, which is twice as long as char (remember .Net uses
unicode all the way).

But then, why you want to use std::ifstream if you can just use the .Net
class library? I don't think the .Net thinggy and the standard library mix
well.

ben

 

[Peter Julian]

I mean the String Class not a std::string.

Regards,

Then why ask here? String is proprietary. std::string and std::wstring are
part of the standard.

 

[Shaun]

what you want can be found here:

http://blogs.msdn.com/slippman/archive/2004/06/02/147090.aspx

note that the concept still applies even if you aren't using Whidbey.

And for future reference, you'll want to post questions like this to
the relevant microsoft.public.* newsgroup. Folks here tend to
appreciate sticking to the c++ standard libraries.