如何从.net Webservice解码Gzip压缩字符串？

Question

我从XML格式的.net Web服务获得了压缩响应字符串。如何解码响应字符串？

我的代码如下所示。

NSString *mysUrl=@"myurl";
NSString *soapMsg1 = [NSString stringWithFormat:@"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"

                      "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">\n"

                      "<soap:Body>\n"
                      "<CompressString xmlns=\"http://tempuri.org/\">"
                      "<text>%@</text>"
                      "</CompressString>"
                      "</soap:Body>\n"
                      "</soap:Envelope>",@"abcdefghijklmonpqrstuvwxyz"];



NSLog(@"%@",soapMsg1);



NSURL *url1 = [NSURL URLWithString:mysUrl];


NSMutableURLRequest *req1 = [NSMutableURLRequest requestWithURL:url1];

NSString *msgLength1 = [NSString stringWithFormat:@"%d", [soapMsg1 length]];

[req1 addValue:@"text/xml; charset=utf-8"  forHTTPHeaderField:@"Content-Type"];


NSLog(@"lenght of the message is.......%@",msgLength1);

[req1 addValue:@"http://tempuri.org/CompressString" forHTTPHeaderField:@"SOAPAction"];



[req1 addValue:msgLength1 forHTTPHeaderField:@"Content-Length"];


  NSLog(@"lenght of the message is.......%@",req1);


[req1 setHTTPMethod:@"POST"];

[req1 setHTTPBody: [soapMsg1 dataUsingEncoding:NSUTF8StringEncoding]];

NSURLResponse *response;

NSError *error;

//getting the data

[req1 addValue:@"gzip" forHTTPHeaderField:@"Accept-Encoding"];


NSData *newData = [NSURLConnection sendSynchronousRequest:req1 returningResponse:&response error:&error];

NSString *responseString = [[NSString alloc] initWithData:newData encoding:NSUTF8StringEncoding];


NSLog(@"\n\n\n Compression string response %@ \n\n\n",responseString);