解析 Curl Api 时出错

Posted 2023-03-08

【中文标题】解析 Curl Api 时出错

【英文标题】：Error When Parsing Curl Api

【发布时间】：2014-12-09 05:36:06

【问题描述】：

我已经实现了这段代码。当我第一次运行它时，它会给出响应。但是当我第二次运行它时，它会给出错误......

Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (No value.) UserInfo=0x178265540 NSDebugDescription=No value.

但是每当我卸载并重建它时，它都会给出响应。

 NSMutableArray *data=[[NSMutableArray alloc]initWithObjects:@"type",@"st_eml",@"st_pwd",nil];
    NSMutableArray *value=[[NSMutableArray alloc]initWithObjects:@"normal", @"Huhn",@"1234", nil];
    
    //NSArray *keys = [[NSArray alloc ]initWithObjects:@"type", @"st_eml", @"st_pwd", nil];
    //NSArray *objects = [[NSArray alloc]initWithObjects:@"normal", @"Huhn",@"123", nil];
    NSDictionary *theRequestDictionary = [NSDictionary dictionaryWithObjects:value forKeys:data];
    
    // Serialize the data
    NSError *error = NULL;
    NSData *theJSONData = [[CJSONSerializer serializer] serializeDictionary:theRequestDictionary error:&error];
    
    
    
    NSLog(@"Serialization Error: %@", error);
    
    // Change the data back to a string
    NSString* theStringObject = [[NSString alloc] initWithData:theJSONData encoding:NSUTF8StringEncoding];
    
    // Determine the length of the data
    NSData *requestData = [theStringObject dataUsingEncoding:NSUTF8StringEncoding];
    
    
       NSString* requestDataLengthString = [[NSString alloc] initWithFormat:@"%lu", (unsigned long)[requestData length]];
    
    // Create request to send to web service
    
    NSString *strurl = @"http://testing.singletreffen.de/appapi/v1/login";
    NSString* webStringURL = [strurl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString:webStringURL]];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:requestData];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setValue:requestDataLengthString forHTTPHeaderField:@"Content-Length"];
    
    [request setTimeoutInterval:30.0];
    
    // Deserialize the response
    NSData *returnData = [ NSURLConnection sendSynchronousRequest: request returningResponse: nil error:&error];
    NSString *returnString = [[NSString alloc] initWithData:returnData encoding: NSUTF8StringEncoding];

【参考方案1】：

我已经尝试过您的代码，对解析进行了一些更改，它可以正常工作并给出响应

NSMutableArray *data=[[NSMutableArray alloc]initWithObjects:@"type",@"st_eml",@"st_pwd",nil];
    NSMutableArray *value=[[NSMutableArray alloc]initWithObjects:@"normal", @"Huhn",@"1234", nil];

    NSDictionary *theRequestDictionary = [NSDictionary dictionaryWithObjects:value forKeys:data];

    // Serialize the data
    NSError *error = nil;
    NSData *theJSONData = [NSJSONSerialization dataWithJSONObject:theRequestDictionary options:0 error:&error];


    NSLog(@"Serialization Error: %@", error);

    // Change the data back to a string
    NSString* theStringObject = [[NSString alloc] initWithData:theJSONData encoding:NSUTF8StringEncoding];

    // Determine the length of the data
    NSData *requestData = [theStringObject dataUsingEncoding:NSUTF8StringEncoding];


    NSString* requestDataLengthString = [[NSString alloc] initWithFormat:@"%lu", (unsigned long)[requestData length]];

    // Create request to send to web service

    NSString *strurl = @"http://testing.singletreffen.de/appapi/v1/login";
    NSString* webStringURL = [strurl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString:webStringURL]];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:requestData];
    [request setHTTPBody:requestData];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setValue:requestDataLengthString forHTTPHeaderField:@"Content-Length"];

    [request setTimeoutInterval:30.0];

    // Deserialize the response
    NSData *returnData = [ NSURLConnection sendSynchronousRequest: request returningResponse: nil error:&error];
    NSString *returnString = [[NSString alloc] initWithData:returnData encoding: NSUTF8StringEncoding];
    NSLog(@"LOG : %@", returnString);

【讨论】：

它给了一些时间，但有些时候仍然是同样的问题。