1. NSString转化NSData
NSData* aData = [@"a nsstring" dataUsingEncoding: NSUTF8StringEncoding];
2.NSData转化NSString
NSString* aString = [[NSString alloc] initWithData:aData encoding:NSUTF8StringEncoding];
3.NSString转化char
char cstr[10];
cstr =[aString UTF8String];
4.NSData转化char
char* cstr=[aData bytes];
5.char转化NSString
- (id)initWithUTF8String:(const char *)bytes
NSString *bString = [[NSString alloc] initWithUTF8String:cstr];
6.char转化NSData
NSData *data = [NSData dataWithBytes:cstr length:strlen(cstr)];
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