The char_traits, _Copy_s() method C++ program example

Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows XP Pro SP2

Header file: Standard

Additional library: none/default

Additional project setting: Set project to be compiled as C++

Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C++ Code (/TP)

Other info: none

To do: Using C++ _Copy_s() which copies at most a specified number of characters from an indexed position in a source string to a target character array

To show: How to use the C++ _Copy_s() to copy at most a specified number of characters from an indexed position in a source string to a target character array

// basic_string _Copy_s()

#include <string>

#include <iostream>

using namespace std;

int main(void)

{

string str1("Hello World");

// string iterator

basic_string<char>::iterator str_Iter;

// array's size

const int array1_size = 20;

// initialize all element to 0

char array1[array1_size] = { 0 };

const int array2_size = 10;

char array2[array2_size] = { 0 };

basic_string<char>:: pointer array1Ptr = array1;

basic_string<char>:: value_type *array2Ptr = array2;

cout<<"The original string str1 is: ";

for (str_Iter = str1.begin(); str_Iter != str1.end(); str_Iter++)

cout << *str_Iter;

cout<<endl;

basic_string<char>::size_type nArray1;

nArray1 = str1._Copy_s(array1Ptr, array1_size, 12);

cout<<"The number of copied characters in array1 is: "

<<nArray1<<endl;

cout<<"The copied characters array1 is: "<<array1<<endl;

basic_string<char>:: size_type nArray2;

nArray2 = str1._Copy_s(array2Ptr, array2_size, 5, 6);

cout<<"The number of copied characters in array2 is: "

<<nArray2<<endl;

cout<<"The copied characters array2 is: "<<array2Ptr<<endl;

return 0;

}

Output example:

The original string str1 is: Hello World

The number of copied characters in array1 is: 11

The copied characters array1 is: Hello World

The number of copied characters in array2 is: 5

The copied characters array2 is: World

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