Why doesn't this work in Windows Form Applications?

[pinky4free]

	void toLowerCaseSTD(String^ &str)
{
	transform(str.begin(), str.end(), str.begin(), tolower);
}

The error is this

Error	2	error C2228: left of '.end' must have class/struct/union	c:\users\jeremy\documents\visual studio 2010\projects\launcher\launcher\Form1.h	24
Error	5	error C2228: left of '.c_str' must have class/struct/union	c:\users\jeremy\documents\visual studio 2010\projects\launcher\launcher\Form1.h	234
Error	1	error C2228: left of '.begin' must have class/struct/union	c:\users\jeremy\documents\visual studio 2010\projects\launcher\launcher\Form1.h	24

[pinky4free]

Is there another method i can use to change uppercase letters to lower case letters in C++ windows form application? It'd be greatly appreciated. This code works fine in Console apps, just not Windows Forms apps.

[vlad from moscow]

Class System::String has method ToUpper that you should use.
For example in C# the corresponding code will look

string s = "This is a test";
s = s.ToUpper();

Console.WriteLine( s );

[pinky4free]

Actually i just used a different method but i need help with another thing...
i'm trying to convert a String^ to a const char*. Got any ideas?

So far i've tried
const char* = total1.data();

and

const char* = total1.c_str();

but the .Net framework says this

Error 1 error C2228: left of '.data' must have class/struct/union c:\users\jeremy\documents\visual studio 2010\projects\launcher\launcher\Form1.h 237

same thing for the .c_str();

DDD:

[pinky4free]

Bump

[kbw]

You're confusing an .Net string with a C++ stanadard string. In this instance, transform() is expecting a C++ standard string.

[pinky4free]

Okay so how would i convert a String^ to a const char*? That's my real question. Idc how it is done as long as it is done.

[o1vk4iN6]

Why use microsoft's mutant version of C++ ?

Okay so how would i convert a String^ to a const char*?

If you were using std::string it would be var.c_str().

[naraku9333]

http://msdn.microsoft.com/en-us/library/d1ae6tz5(v=vs.80).aspx

[pinky4free]

@xerzi I already knew that if you didn't read my other post i obviously stated that it doesn't work. :\

@naraku9333 I need it to be a "const char*" which that does not convert to.

[kbw]

Presumably, you could just do:

std::wstring wstr = PtrToStringChars(str);

... CLR. uh!

[pinky4free]

I got it to work and no that isn't how it works. Windows form apps uses the .net framework buddy.

[naraku9333]

@naraku9333 I need it to be a "const char*" which that does not convert to.

All you would need to add to the code in the link is const char* cch(ch);

Windows form apps uses the .net framework buddy.

C++ CLI can use both .Net and the std library.