object-c NSString / NSData / char* 类型之间的转换
2012-11-02 11:21
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1. NSString转化为UNICODE String: (NSString*)fname = @“Test”; char fnameStr[10]; memcpy(fnameStr, [fname cStringUsingEncoding:NSUnicodeStringEncoding], 2*([fname length]));
与strcpy相比,memcpy并不是遇到'\0'就结束,而是一定会拷贝完n个字节
2. NSString 转化为 char * NSString * str= @“Test”; const char * a =[str UTF8String];
3.char * 转化为 NSString
NSString *str=[NSString stringWithCString encoding:NSUTF8StringEncoding];
4. char * 转化 NSData 方法一: char * a = (char*)malloc(sizeof(byte)*16); NSData *data = [NSData dataWithBytes: a length:strlen(a)]; 方法二: 转换为NSString: - (id)initWithUTF8String:(const char *)bytes 然后用NSString的 - (NSData *)dataUsingEncoding:(NSStringEncoding)encoding 5. NSData 转化 char * NSData data ; char* a=[data bytes]; 6. NSData 转化 NSString;
NSData* data;
NSString* aStr= [NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
7. NSString 转化 NSData对象 NSData* xmlData = [@"testdata" dataUsingEncoding:NSUTF8StringEncoding]; 8.NSString输出CGPoint UIButton *buttn=[UIButtonbuttonWithType:UIButtonTypeRoundedRect]; buttn.frame=CGRectMake(0, 2, 100, 100); NSLog(@"===%@",NSStringFromCGRect(buttn.frame)); //输出CGpoint和CGrect 9.中文与utf8相互转换 NSString *str=@"老大-老二"; NSString *ss=[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; //向网络传中文字符串要转换为utf8字符串再传,utf8码也是放在nsstring里的 NSString *str2=[ss stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; //utf8转换成中文字符串 NSLog(@"%@++\n",str); NSLog(@"%@--\n",ss); NSLog(@"%@==\n",str2); 10.NSString转换成NSArray NSArray *array=[str componentsSeparatedByString:@"-"]; for (int i=0; i<2; i++) { NSLog(@"++%@++\n",[array objectAtIndex:i]); }
11.NSString 转化 NSURL
NSString *urlString=[@"http://www.google.com/search?client=safari&rls=en&q=搜索&ie=UTF-8&oe=UTF-8" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url = [NSURL URLWithString:urlString];
12.NSURL 转化 NSString
NSString *s=[[url absoluteString] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSArray *arr = [urlString componentsSeparatedByString:@"&"];NSURL *url = [NSURL URLWithString:[[arr objectAtIndex:0] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding ]];NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];[request setHTTPMethod:@"POST"];NSMutableArray *_array = [[NSMutableArray alloc] initWithCapacity:0];for (int i = 1; i < [arr count]; ++i ){NSString *str = [arr objectAtIndex:i];[_array addObject:str];}[_array componentsJoinedByString:@"&"];NSData *data = [[_array componentsJoinedByString:@"&"] dataUsingEncoding: NSASCIIStringEncoding];[request setHTTPBody:data];
// 发送请求并获得服务器反馈的数据NSData *urldata = [AESEnCDeCViewController Get:url];// 第一种 转换NSData数据到char*字符串char * test = (char*)[urldata bytes];std::string old = deaes(test);// 第二种 转换NSData到UTF8编码的NSString中再转换为char*字符串NSString *desStr = [[NSString alloc] initWithData:urldata encoding:NSUTF8StringEncoding];const char *desresult = [desStr UTF8String];std::string old = deaes(desresult);
// 解密字字符串到明文NSString *oldstr = [[NSString alloc] initWithCString:old.c_str()];
很多时候软件读取的中文网页编码集是gb2312,所以显示出来的是乱码。这时需要将NSString文字编码转换
1 NSURL *url = [NSURL URLWithString:urlStr];2 NSData *data = [NSData dataWithContentsOfURL:url];3 NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);4 NSString *retStr = [[NSString alloc] initWithData:data encoding:enc];
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