How to convert a string into an array of char?

[zagabar]

Hi.

I want to convert a string into an array of chars but I have no idea how to do it. Someone please help.

[MrViggy]

The function is 'std::string::c_str()':

std::string myString = "This is my string!";
const char *pArrayOfChars = myString.c_str();
assert(pArrayOfChars[2] == 'i');

Viggy

[AlbertGM]

It could be something like:

#include <string>
#include <iostream>

using namespace std;

#define SIZE 30

int main(void)
{
	string sStr="Hi, World";
	char sArr[SIZE];

	memset(sArr, 0, SIZE); //Inicialize array
	memcpy(sArr, sStr.c_str(), strlen(sStr.c_str())); //copy Array
	
	cout << sArr << endl;
}

Albert.

[zagabar]

Thanks viggy, but i do not fully understand it. Could you add comments on each line please?

[zagabar]

No, there is no need for that. I solved it thanks to albert's advice ^^ thanks albert!

[jfaust]

Or, if you don't need your own copy, I'd stick with Viggy's advice:

#include <string>
#include <iostream>

using namespace std;

int main()
{
	string sStr ="Hi, World";
	const  char* sArr = sStr.c_str();
	cout << sArr << endl;
}

Jeff

[exterminator]

int main(void)

Writing void like that is redundant in C++ and doesn't make it look good.

memset(sArr, 0, SIZE); //Inicialize array

No need to initialize this way - setting the first character to '\0' is enough for C-style strings.

memcpy(sArr, sStr.c_str(), strlen(sStr.c_str())); //copy Array

Prone to going beyond sArr buffer size. Either provide a check for sStr length and SIZE or use dynamic allocs.

//Are you fat Albert from Hitch? kiddin'..

[Tsubasa]

I tried using memcpy and by using viggy's method but each time i get an error saying that c_str() is not declared

[jfaust]

I tried using memcpy and by using viggy's method but each time i get an error saying that c_str() is not declared

Post your code, please.

Jeff

[Mitsukai]

convert a string to char array???

a std::string IS a char array!
well not explicitly by stl....

and what is a "string"? is it char x[] = "ASDF" or char* x = "ASDF"; or std::string x = "SDFG" or CString x = "ASDF"; or wchar_t or TCHAR isntead of char.. or something else??