String和char转换

//string 转成 char:

NSString to const char *:
NSString * cocoaString = [[NSString alloc] initWithString:@"My NSString"];
const char * myCstring = [cocoaString cString];


char mychar[100];
NSString * mystring;
strcpy(mychar,(char *)[mystring UTF8String]);

//char 转成 string:

NSString *TempString;
char mychar[100];
mystring=[NSString stringWithFormat:@"%s",mychar];

const char * to NSString:
const char * cString = "Hello";
NSString * cocoaString = [[NSString alloc] initWithCString:cString];