C++中CString string char* char 之间的字符转换（多种方法）

// CharConvert.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include<iostream>
#include<afx.h>
#include<string>
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
	//此方法适用于“多字节” 否则会出现'strcpy' : cannot convert parameter 2 from 'unsigned short *' to 'const char *'
	/*CString str("Hello zzu");
	cout<<"the CString is "<<str<<endl;
	char a[100];
	strcpy(a,str);
	cout<<"the convert to char * is "<<a<<"(char *)"<<endl;*/

	//CString 转换成string
	//  CString c_str1("Hello Zhengzhou University");
	//string str;
	//str=c_str1.GetBuffer(0);
	//c_str1.ReleaseBuffer();  //否则就没有释放缓冲区所占的空间
	//cout<<str<<endl;
	//cout<<"\n"<<c_str1<<endl;

	//string 转换成CString
	/*string str1("Hello College of Information Engineering");
	CString c_str2;
	c_str2=str1.c_str(); //c_str()：生成一个const char*指针，指向以空字符终止的数组。
	cout<<"the CString is "<<c_str2<<endl;
	cout<<"the string is "<<str1<<endl;*/

	//string转换成const char*
	//方法一：
	//string str2("Hello College of Information Engineering");
	//const char * str3;  //常数指针
	//str3=str2.c_str();
	//cout<<"string  is  "<<str2<<endl;
	//cout<<"const char is "<<str3<<endl;
	

	//方法二:
 // /* string str("Hello College of Information Engineering");
	//const char * c_str;
	//c_str=str.data();
	//cout<<"string is  "<<str<<endl;
	//cout<<"const char is"<<c_str<<endl;*/
	
	
	
	//string 直接转换成char*
	///*string s1 = "abcdefg";
	//char *data;
	//int len = s1.length();
	//data = (char *)malloc((len)*sizeof(char));
	//s1.copy(data,len,0);
	//cout<<len<<endl;
	//cout<<data<<endl;*/
	
  
    
	//string.copy()的用法
	  //size_t length;
  //  char buffer[8];
  // string str("Test string......");
  //  
  // length=str.copy(buffer,7,6);    //从buffer6，往后数7个，相当于[ buffer[6], buffer[6+7] ）
  // buffer[length]='\0';            //加上'\0'使得buffer就到buffer[length]为止；
 
  // cout <<"buffer contains: " << buffer <<endl;
  //char * 转换成string


	//char *到string
  /* char * c_str="zzu";
	string str(c_str);
	cout<<"the c_str "<<c_str<<endl;
	cout<<"the string is"<<str<<"and length is "<<str.length()<<endl;*/


	//char a[]="asd";
	//cout<<strlen(a)<<endl; //为什么显示的是3，不是有一个\0吗

	//char * 到CString
  
	////char * c_str1="zzu";
	////CString str; //可以直接转换，因为CString存在重载(在多字节字符集下适用)
	////str.Format("%s",c_str1);
	////cout<<"the c_str1 is"<<c_str1<<endl;	
	////cout<<"the CString is"<<str<<endl;



	//方法1：使用API：WideCharToMultiByte进行转换（使用过，有效）
   //CString str= CString("This is an example!");
   //int n = str.GetLength(); //按字符计算，str的长度
   //int len = WideCharToMultiByte(CP_ACP,0,str,n,NULL,0,NULL,NULL);//按Byte计算str长度
   //char *pChStr = new char[len+1];//按字节为单位
   //WideCharToMultiByte(CP_ACP,0,str,n,pChStr,len,NULL,NULL);//宽字节转换为多字节编码
   // pChStr[len] = '\0';//不要忽略末尾结束标志
   //用完了记得delete []pChStr,防止内存泄露
	return 0;
}

CString s; 
int i = 64; 
s.Format("%d", i)