String Functions?

[r-S]

Hi everyone on .NET Talk!

 

I am a new programmer to VC++ .NET - I'm migrating from VB 6.0, which I used for around 3 years. I'm 17 years old, from the UK, and I've been interested in programming since the age of 11 - when I started playing around in QBasic :p . In the future, I'm aiming for a job in software development, and it seems that for me C++ .NET is the way to that goal. I'm currently midway through an ICT course at college - but hopefully I'll be able to enroll for a development course at Uni two years from now :D

 

Anyway, enough of my little introduction - I have a question which I was hoping someone could answer. I've searched the forums, and found a little more information that I had to start with, but I'm still lacking a bit.

 

There are a few functions I'm looking for, if anyone can provide a link or the information that would be great!

 

(all VB code I post is VB6.0, despite the "VB.net" at the top of my tags!)

 

len()

Dim userName as String
userName = "r-S"
msgbox(len(userName))

Would show a messagebox containing the number 3. How can I do this in C++ .NET? I have found in this forum the function strlen(), however this works only with char variables. The way I have declared the variable in question is

System::String *sText = Form1::Text1->Text;

Is this even the correct way to declare a string?

 

--------

 

split()

Dim userInfo() as String
userInfo = Split(sData, ";")

In VB6.0, this would split the string "sData" into parts around each ";". They are accesable by using userInfo(0) to get the first part, userInfo(1) to get the second part, and so on. Is there an equivelant function in C++ .NET?

 

Sorry for such a long question - I could find nowhere with this information (though I expect it's out there somewhere :o )

 

Thankyou for any help or links ;)

[PlausiblyDamp]

If you are using the .Net string data type then a lot of the 'old' functionality is available through the variable itself.

 

e.g.

Dim userInfo() as String
userInfo = sData.Split( ";") 

''''''''''''''''''''''''''
Dim userName as String
userName = "r-S"
MessageBox.Show(userName.Lengh)

 

C++ isn't my strongest subject but I think you can declare a string without requiring a pointer.

[music7611]

Now, I don't think I'm the right guy to reply because I don't know VB or C++.net, but I do know plain old C++ and I can show you the way to do that in that.

 

Using Character Arrays:

char userName[4];
strcpy(userName, "r-s");
MessageBox(NULL, userName, "User Name", MB_OK);

 

Using STL:

#include <string>
//...
std::string userName("r-s");
MessageBox(NULL, userName.c_str(), "User Name", MB_OK);

 

.Net is probably a lot more like the STL version, but you can use both in a .Net program.

 

EDIT: Forgot the split part, sorry

Correct me if I'm wrong, but if you call split like you did, it will take a string like "Hi;How are you;I'm fine" and make it "Hi", "How are you", and "I'm fine".

 

I don't think there is a function that will do this for you, but you could do something like this:

#include <vector>
#include <string>
using namespace std;

void Split(vector<string> &strlist, string &str, string delim)
{
strlist.clear();
int index=0;
int oldindex=0;
while((index=str.find(delim, oldindex))!=string::npos)
{
	if(index==oldindex)
		index++;
	else
	{
		string newstr;
		newstr=str.substr(oldindex, index-oldindex);
		strlist.push_back(newstr);
	}
	oldindex=index;
}
if(oldindex<str.length())
{
	string newstr;
	newstr=str.substr(oldindex, str.length()-oldindex);
	strlist.push_back(newstr);
}
}

 

Then, when you need to use it you just do this:

vector<string> userInfo;
Split(userInfo, sData, ";");

Edited January 9, 2005 by music7611