Question

我使用

读取证书信息

NSString *summary = CFBridgingRelease(SecCertificateCopySubjectSummary(cert));

获取证书摘要，当摘要为中文时，例如中，摘要返回为ä¸

如何将ä¸编码为中更正？

代码如何获得证书摘要

CFMutableDictionaryRef query = CFDictionaryCreateMutable(nil, 4, nil, nil);
CFDictionaryAddValue(query, kSecClass, kSecClassCertificate);

CFDictionaryAddValue(query, kSecMatchLimit, (const void *)@(100));
CFDictionaryAddValue(query, kSecReturnRef, kCFBooleanTrue);

CFArrayRef items;
OSStatus status = SecItemCopyMatching(query, (CFTypeRef *)&items);
NSArray *certificates = CFBridgingRelease(items);
for (int i = 0; i < certificates.count; i++)
{
    SecCertificateRef certificate = (__bridge SecCertificateRef)certificates[i];
    NSString *summary = (NSString *)CFBridgingRelease(SecCertificateCopySubjectSummary(certificate);
    NSLog(@"%@", summary);
}

当summary是中文字符串时，结果不正确。

Answer 1

解决问题。首先，我打印nsstring中的每个字符，看起来像

228 184 173

汉字在utf8中使用3个字符，所以我将它切换到bin

0b1110 0100
0b10 111000
0b10 101101
//for utf8 to unicode, it's
0100111000101101
//to int
20013
//which is 中 at unicode

对于UTF8 Decoding with NSString帮助，最后将字符串形式utf8切换为unicode。

如何检查NSString编码

1 个答案: