ios项目开发（天气预报项目）：使用正则获取 weather.com.cn网站信息

[objc] view plaincopyprint?在CODE上查看代码片派生到我的代码片
<pre code_snippet_id="346208" snippet_file_name="blog_20140515_1_2220869" name="code" class="cpp">- (NSString *)hmacsha1:(NSString *)text key:(NSString *)secret { 
    NSData *secretData = [secret dataUsingEncoding:NSUTF8StringEncoding]; 
    NSData *clearTextData = [text dataUsingEncoding:NSUTF8StringEncoding]; 
    unsigned char result[20]; 
    CCHmac(kCCHmacAlgSHA1, [secretData bytes], [secretData length], [clearTextData bytes], [clearTextData length], result); 
     
    char base64Result[32]; 
    size_t theResultLength = 32; 
    Base64EncodeData(result, 20, base64Result, &theResultLength); 
    NSData *theData = [NSData dataWithBytes:base64Result length:theResultLength]; 
     
    NSString *base64EncodedResult = [[NSString alloc] initWithData:theData encoding:NSASCIIStringEncoding]; 
     
    return base64EncodedResult; 
}</pre><br> 
<br> 
<pre></pre>