======================================

string 轉 CCString
std::string str = "123";

CCString* ns=CCString::createWithFormat("%s",str.c_str());

CCString 轉 string

std::string s= ns->m_sString;//ns是一個CCString*型別

======================================

char 轉  int

 char*buf ="1122";

int n = std

int 轉 char

int a=3;

CCString* ns=CCString::createWithFormat("%d",a);

const char* s=ns->getCString();

這裡額外提一下，IOS在參與跨平臺用到的編碼格式轉換

  const char* char_url;    const char*char_parameter;

格式刷：

  NSString *endstr=[NSString stringWithFormat:@"%@?%@",char_url,char_parameter];

轉換編碼格式為utf－8

  endstr=[endstr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];//解決中文編碼

NSString  轉  char*

const char *char_gurl = [endstr cStringUsingEncoding:NSUTF8StringEncoding];

  char* 轉 NSString 

const char* gameObject;

NSString *char_gameObject = [[NSString alloc] initWithCString:(const char*)gameObject

                                                             encoding:NSUTF8StringEncoding];

char* 轉 URL

const char* url;

NSString *char_url = [[NSString alloc] initWithCString:(const char*)url

                                                      encoding:NSUTF8StringEncoding];

NSURL* url=[NSURL URLWithString:char_url];