Question

请帮帮我。我有这个代码来获取从正常可读字符串发送到服务器所需的字符串

- (NSString *)hexForWindowsCP1251 //"Привет"
{
   size_t theLength = strlen([self cStringUsingEncoding:NSWindowsCP1251StringEncoding]);

   const char *selfChar = [self cStringUsingEncoding:NSWindowsCP1251StringEncoding];

   NSData *stringData = [NSData dataWithBytes:selfChar length:theLength];

   NSString * hexStr = [NSString stringWithFormat:@"%@", stringData];

   for(NSString * toRemove in [NSArray arrayWithObjects:@"<", @">", @" ", nil])
   {
      hexStr = [hexStr stringByReplacingOccurrencesOfString:toRemove withString:@""];
   }

   return hexStr; //cff0e8e2e5f2      
 }

英语和俄语文本都可以（我的字符串是“12e314f4”）

我不知道如何从这样的字符串中获取可读文本。

例如字符串“Привет”（俄语版本）变为“cff0e8e2e5f2”

我需要反之亦然得到字符串“Hello”（如果是用英语编码的）和“Привет”（如果是用俄语编码的话）......

Answer 1

我终于得到了转换为十六进制字符串并返回的工作流程。

这三种方法在NSString类别中实现：

 //To get hexEncoded string to pass to server:
- (NSString *)hexForWindowsCP1251
{
    size_t theLength = strlen([self cStringUsingEncoding:NSWindowsCP1251StringEncoding]);

    const char *selfChar = [self cStringUsingEncoding:NSWindowsCP1251StringEncoding];
    // \xef\xf0\xe8
    NSData *stringData = [NSData dataWithBytes:selfChar length:theLength];

    NSString * hexStr = [NSString stringWithFormat:@"%@", stringData];

    for(NSString * toRemove in [NSArray arrayWithObjects:@"<", @">", @" ", nil])
    {
        hexStr = [hexStr stringByReplacingOccurrencesOfString:toRemove withString:@""];
    }

    return hexStr;
}


//To make the string readable


- (NSString *)hexToStringNSWIndows1251
{
    NSData *bytes = [self dataFromHexString];

    NSString *toReturn = [[NSString alloc] initWithData:bytes encoding:NSWindowsCP1251StringEncoding];
    return toReturn;
}
- (NSData *)dataFromHexString
    {
        const char *chars = [self UTF8String];
        int i = 0, len = self.length;

        NSMutableData *data = [NSMutableData dataWithCapacity:len / 2];
        char byteChars[3] = {'\0','\0','\0'};
        unsigned long wholeByte;

        while (i < len) {
            byteChars[0] = chars[i++];
            byteChars[1] = chars[i++];
            wholeByte = strtoul(byteChars, NULL, 16);
            [data appendBytes:&wholeByte length:1];
        }

        return data;
    }

iOS如何解码使用NSWindowsCP1251编码的字符串

1 个答案: