在处理中文时有时需要进行wchar_t，char，string，wstring之间的转换。

其中char和string之间、wchar_t和wstring之间的转换较为简单，代码在vs2010下测试通过。
复制代码 代码如下:
#include <iostream>
#include <string>
#include <tchar.h>
#include <Windows.h>

using namespace std;

//Converting&nbsp;a&nbsp;WChar&nbsp;string&nbsp;to&nbsp;a&nbsp;Ansi&nbsp;string
char *w2c(char *pcstr,const wchar_t *pwstr, size_t len)
{
int nlength=wcslen(pwstr);
//获取转换后的长度
int nbytes = WideCharToMultiByte( 0, 0, pwstr, nlength, NULL,0,NULL, NULL );
if(nbytes>len) nbytes=len;
// 通过以上得到的结果，转换unicode 字符为ascii 字符
WideCharToMultiByte( 0,0, pwstr, nlength, pcstr, nbytes, NULL, NULL );
return pcstr ;
}

int main(){

setlocale(LC_ALL,"chs");
char* cc = "this is a char 测试";
wchar_t* wcc = L"this is a wchar 测试";
string str("this is a string 测试 ");
wstring wstr = L"this is a wstring 测试";

//string to char
const char* char_test = str.c_str();
//cout<<"char_test:"<<char_test<<endl;

//char to string
string ss = cc;
//cout<<"ss is :"<<ss<<endl;

//wstring to wchar
const wchar_t* wchar_test = wstr.c_str();
//wcout<<wchar_test<<endl;

//wchar to wstring
wstring wss = wcc;
wcout<<wcc<<endl;

//char to wchar_t
wchar_t *wc = new wchar_t[str.size()+1];
//swprintf(wc,L"%S",cc);
//wcout<<cc<<endl;
delete []wc;

// wchar_t to char
char *pcstr = (char *)malloc(sizeof(char)*(2 * wcslen(wcc)+1));
memset(pcstr , 0 , 2 * wcslen(wcc)+1 );
w2c(pcstr,wcc,2 * wcslen(wcc)+1) ;
free(pcstr);

system("pause");
return 1;
}