NSString / NSData / char* 类型之间的转换
NSString / NSData / char* 类型之间的转换
转自:http://www.cnblogs.com/pengyingh/articles/2341880.html
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:NSASCIIStringEncoding];
7. NSString 转化 NSData对象 NSData* xmlData = [@"testdata" dataUsingEncoding:NSUTF8StringEncoding];
NSString 转化 NSURL
//NSURL *url = [NSURL URLWithString:[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding ]];
NSString *urlString=[@"http://www.google.com/search?client=safari&rls=en&q=搜索&ie=UTF-8&oe=UTF-8" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL 转化 NSString
NSURL *url=[NSURL URLWithString:urlString]; NSString *s=[[url absoluteString] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; NSArray *arr = [urlStr 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
NSURL *url = [NSURL URLWithString:urlStr]; NSData *data = [NSData dataWithContentsOfURL:url]; NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000); NSString *retStr = [[NSString alloc] initWithData:data encoding:enc];
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