cocos2d-x 字符串类型转换

cocos2d-x中使用的字符串有const char *，std::string，cocos2d::_String;

1、const char * -> std::string

const char *cstr= "abc";
std::string name(cstr);

2、const char * -> cocos2d::_String

const char *cstr= "abc";
_String *ns = _String::createWithFormat("%s",cstr);

3、 std::string ->const char *

std::string name = "abc";
const char *cstr = name.c_str();

4、 std::string ->cocos2d::_String

std::string name = "abc";
_String *ns =_String::createWithFormat("%s",name.c_str());

5、cocos2d::_String -> const char *

_String *name=_String::create("abc");
const char *cstr = name.getCString();

6、cocos2d::_String ->std::string

_String *ns= _String::create("abc");
std::string name(ns.getCString());

7、cocos2d::_String ->int

int num =0;
_String *ns =_String::createWithFormat("%d",num);
int num2 = ns.intValue();

8、gbk->utf-8

//在Win32平台下，将GBK编码转换为UTF-8  
string MyUtility::gbk_2_utf8(const string text)  
{  
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)  
    //采用Lambda表达式,将string转换成wstring  
    wstring tes = [=]() {  
        setlocale(LC_ALL,"chs");  
        const char* _Source = text.c_str();  
        size_t _Dsize = text.size() + 1;  
        wchar_t *_Dest = new wchar_t[_Dsize];  
        wmemset(_Dest,_Dsize);  
        mbstowcs(_Dest,_Source,_Dsize);  
        std::wstring result = _Dest;  
        delete[]_Dest;  
        setlocale(LC_ALL,"C");  
        return result;  
    }();  
  
    int asciSize = WideCharToMultiByte(CP_UTF8,tes.c_str(),tes.size(),NULL,NULL);  
    if (asciSize == ERROR_NO_UNICODE_TRANSLATION || asciSize == 0)  
    {  
        return string();  
    }  
  
    char *resultString = new char[asciSize];  
    int conveResult = WideCharToMultiByte(CP_UTF8,resultString,asciSize,NULL);  
    if (conveResult != asciSize)  
    {  
        return string();  
    }  
    string buffer = "";  
    buffer.append(resultString,asciSize);  
  
    delete[] resultString;  
    return buffer;  
  
#else  
    return text;  
#endif  
  
}