NSData* newData = [@"testdata" dataUsingEncoding:NSUTF8StringEncoding];
NSData * data;
NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
在iOS底层网络的开发中,会遇到NSData 转 NSString 为空的情况,原因很多,下面的解决方法是针对从服务器传过来的数据中含有非UTF-8字符(主要是UTF-8)的情况。
用libiconv清除非utf8字符
先给项目Link Binaries With Library 添加libiconv.dylib
使用如下函数对NSData进行清理,再进行转换就OK了
-(NSData *)cleanUTF8:(NSData *)data {
iconv_t cd = iconv_open("UTF-8", "UTF-8"); // 从utf8转utf8
int one = 1;
iconvctl(cd, ICONV_SET_DISCARD_ILSEQ, &one); // 丢弃不正确的字符
size_t inbytesleft, outbytesleft;
inbytesleft = outbytesleft = data.length;
char *inbuf = (char *)data.bytes;
char *outbuf = malloc(sizeof(char) * data.length);
char *outptr = outbuf;
if (iconv(cd, &inbuf, &inbytesleft, &outptr, &outbytesleft)
== (size_t)-1) {
NSLog(@"this should not happen, seriously");
return nil;
}
NSData *result = [NSData dataWithBytes:outbuf length:data.length - outbytesleft];
iconv_close(cd);
free(outbuf);
return result;
}
NSData *data;
char *test=[data bytes];
byte* tempData = malloc(sizeof(byte)*16);
NSData *content=[NSData dataWithBytes:tempData length:16];
NSString
转 char *
1. UTF8String
const char *cString = [string UTF8String];
2. cStringUsingEncoding:
const char *cString = [string cStringUsingEncoding:NSUTF8StringEncoding];
3. getCString:maxLength:encoding:
char cStringPtr[string.length * 3 + 1];
memset(cStringPtr, 0, sizeof(cStringPtr));
[string getCString:cStringPtr maxLength:sizeof(cStringPtr) encoding:NSUTF8StringEncoding];
UTF8
编码需要占用3个字节,因此这里需要*3
char*
转 NSString
1. initWithUTF8String:
NSString *string = [[NSString alloc] initWithUTF8String:cString];
2. initWithCString:encoding:
NSString *string = [[NSString alloc] initWithCString:cString encoding:NSUTF8StringEncoding];
3. stringWithFormat:
NSString *string = [NSString stringWithFormat@"%s", cString];
本文地址:https://blog.csdn.net/u012094456/article/details/107149298
如对本文有疑问, 点击进行留言回复!!
O - Steady Cow Assignment POJ - 3189(二分 + 多重匹配)
L - Cat VS Dog HDU - 3829(最大独立集)
M - Jamie‘s Contact Groups POJ - 2289(二分 + 多重匹配)
网友评论