休息Web服务调用 - XML POST请求 - iPhone

Question

我有一个关于xml调用REST Web服务的问题，我必须以下列格式将以下参数传递给我的Web服务;

http://XXX.XXX.XXX.XXX/gayanAPI/GayanRESTService.svc/login

所以我为此编写了一个代码。但它的make有些错误。 （响应代码：400 ）我的示例代码如下;

  //prepare request
NSString *urlString = [NSString stringWithFormat:@"http://XXX.XXX.XXX.XXX/gayanAPI/GayanRESTService.svc/login"];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init] ;
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];

//set headers
NSString *contentType = [NSString stringWithFormat:@"application/xml"];
[request addValue:contentType forHTTPHeaderField: @"Content-Type"];

//create the body
NSMutableData *postBody = [NSMutableData data];
[postBody appendData:[[NSString stringWithFormat:@"<Login xmlns="">"] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"<UserId>%@</UserId>",@"200"] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"<PassWord>%@</PassWord>",@"123"] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"<ResId>%@</ResId>",@"1000"] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"<DeviceId>%@</DeviceId>",@"1234"] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithFormat:@"</Login>"] dataUsingEncoding:NSUTF8StringEncoding]];

//post
[request setHTTPBody:postBody];

//get response
NSHTTPURLResponse* urlResponse = nil;  
NSError *error = [[NSError alloc] init];  
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];  
NSString *result = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSLog(@"Response Code: %d", [urlResponse statusCode]);
if ([urlResponse statusCode] >= 200 && [urlResponse statusCode] < 300) {
    NSLog(@"Response: %@", result); 
    //here you get the response 
}

它是什么原因。我在创建XML请求时犯了一个错误。请帮帮我解决这个问题？你能给我一个代码吗？我厌倦了这一点。

非常感谢。

Answer 1

在这一行中，

[postBody appendData:[[NSString stringWithFormat:@"<Login xmlns="">"] dataUsingEncoding:NSUTF8StringEncoding]];

您需要使用反斜杠（\）引用双引号（“），如下所示：

[postBody appendData:[[NSString stringWithFormat:@"<Login xmlns=\"\">"] dataUsingEncoding:NSUTF8StringEncoding]];

但我不确定它是否会导致错误。