CODEWITHSUNDEEP
pythoniphoneiosweb-servicesladon
Nevil Lad
Nevil Lad

Reputation: 533

How to call web service which is developed in Python's ladon framework from iOS app?

The web services are built on Python's Ladon framework.

Web Service URL is: http://ladonize.org/python-demos/Calculator

The code for calling web service is as below :

  NSString *requestString = [NSString stringWithFormat:
                               @"http://ladonize.org/python-demos/Calculator"];
    NSString *jsonString = [NSString stringWithFormat:@"{\"methodname\":\"add\",\"args\": {\"a\":\"123\",\"b\":\"123\"}}"];
    NSData *jsonData = [NSData dataWithBytes: [jsonString UTF8String] length: [jsonString length]];
    NSURL *url = [NSURL URLWithString:requestString];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody: jsonData];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    [request setValue:[NSString stringWithFormat:@"%d", [jsonData length]] forHTTPHeaderField:@"Content-Length"];

    NSError *errorReturned = nil;
    NSURLResponse *theResponse =[[NSURLResponse alloc]init];
    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&theResponse error:&errorReturned];

    if (errorReturned) {
        NSLog(@"Error %@",errorReturned.description);
    }
    else
    {
        NSError *jsonParsingError = nil;
        NSMutableArray *arrDoctorInfo  = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers|NSJSONReadingAllowFragments error:&jsonParsingError];
        NSString* newStr = [NSString stringWithUTF8String:[data bytes]];
        NSLog(@"Dict %@",newStr);
    }

And I am getting following Response 

<html>
    <head>
        <meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
        <title>Calculator</title>
        <style>

    body { margin: 0px; padding: 0px; font-family: verdana; font-size: 12pt; background-color: #FCFCFC; }

    div.service-header {
        height: 34px;
        font-weight: bold; padding: 10px; font-size: 30px; color: white; border-bottom: 1px solid black; background: #70803C;
        filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#A0B06C', endColorstr='#70803C'); background: -webkit-gradient(linear, left top, left bottom, from(#A0B06C), to(#70803C)); background: -moz-linear-gradient(top,  #A0B06C,  #70803C);
        text-shadow: #555555 2px 3px 3px;
    }
    div.service-header div.service-title {position: relative; float:left}
    div.service-header .skin-selector {padding-top: 8px; margin-bottom: 0; position:relative; float: right; font-size: 12pt;}

    div.service-overview {
        float: right; margin: 20px; width: 200px;
        -moz-border-radius: 7px 7px 7px 7px; -webkit-border-radius: 7px 7px 7px 7px; border-radius: 7px 7px 7px 7px; background-color: #F6F6F6; border: 1px solid #E6E6E6; border-collapse: separate; font-size: 11px; padding: 10px; margin-right: 20px;
        -moz-box-shadow: 2px 2px 4px #555; -webkit-box-shadow: 2px 2px 4px #555; box-shadow: 2px 2px 4px #555;
    }

    div.service-overview div.headline { font-weight: bold; font-size: 18px; }
    div.service-overview div.title { font-weight: bold; margin: 4px; font-size: 1.2em; }
    div.service-overview ul.list { padding: 0px; margin: 0px; margin-left: 15px; list-style-type: none; }
    div.service-overview ul.list li { font-size: 1.1em; }

    div.service-description { padding: 15px; padding-bottom: 0px; }
    div.service-description div.title { font-weight: bold; font-size: 1.2em; }
    div.service-description p.doc-lines { font-size: 0.8em; }
    div.service-description p.url { font-size: 0.8em; font-style: italic; }
    div.service-description p.url span.url-title { font-weight: bold; }

    div.service-interfaces { padding: 15px; padding-bottom: 0px;  }
    div.service-interfaces div.title { font-weight: bold; font-size: 1.2em; }
    div.service-interfaces ul.list { font-size: 0.8em; }
    div.service-interfaces ul.list li { padding: 4px; }

    div.service-api { padding: 15px; padding-bottom: 0px;  }
    div.service-api div.methods div.title { font-weight: bold; font-size: 1.2em; } 
    div.service-api div.methods ul.list { font-size: 0.9em; list-style-type: none; } 
    div.service-api div.methods ul.list li.entry {
        -moz-border-radius: 7px 7px 7px 7px; -webkit-border-radius: 7px 7px 7px 7px; border-radius: 7px 7px 7px 7px; background-color: #F6F6F6; border: 1px solid #E6E6E6; 
        border-collapse: separate; font-size: 0.8em; padding: 10px; margin-right: 20px;
        -moz-box-shadow: 2px 2px 5px #555; -webkit-box-shadow: 2px 2px 5px #555; box-shadow: 2px 2px 5px #555;
        margin-bottom: 16px;
    } 
    div.service-api div.methods ul.list li.entry div.declaration {
        font-size: 1.5em;
    } 
    div.service-api div.methods ul.list li.entry div.declaration span.name { color: #881a1a; } 
    div.service-api div.methods ul.list li.entry span.param-type { color: #68387f; } 
    div.service-api div.methods ul.list li.entry span.param-name {} 
    div.service-api div.methods ul.list li.entry p.doc-lines { font-size: 1.2em; color: #276d11; } 
    div.service-api div.methods ul.list li.entry ul.params p.doc-lines { margin-top:0;margin-bottom:6px; font-size: 1.0em; color: #276d11; } 

    div.service-api div.types div.title { font-weight: bold; font-size: 1.2em; } 
    div.service-api div.types ul.list { font-size: 0.9em; list-style-type: none; } 
    div.service-api div.types ul.list li.entry {
        -moz-border-radius: 7px 7px 7px 7px; -webkit-border-radius: 7px 7px 7px 7px; border-radius: 7px 7px 7px 7px; background-color: #F6F6F6; border: 1px solid #E6E6E6; 
        border-collapse: separate; font-size: 0.8em; padding: 10px; margin-right: 20px;
        -moz-box-shadow: 2px 2px 5px #555; -webkit-box-shadow: 2px 2px 5px #555; box-shadow: 2px 2px 5px #555;
        margin-bottom: 16px;
    } 
    div.service-api div.types ul.list li.entry div.definition {
        font-size: 1.5em;
    } 
    div.service-api div.types ul.list li.entry div.definition span.name { color: #881a1a; } 
    div.service-api div.types ul.list li.entry span.param-type { color: #68387f; } 
    div.service-api div.types ul.list li.entry span.param-name {} 
    div.service-api div.types ul.list li.entry p.doc-lines { margin-top:0;margin-bottom:6px; font-size: 1.0em; color: #276d11; } 

    div.service-footer { font-size: 0.8em; text-align: center; font-style: italic; padding-top: 10px; padding-bottom: 10px; }

    a:link { color: #00732F; text-decoration: none }
    a:visited { color: #00732F; text-decoration: none }
    a:hover { color: #00732F; text-decoration: underline }

        </style>
    </head>
    <body>
        <div class="service-header">
            <div class="service-title">Calculator</div>
            <form method="get" class="skin-selector">
                <label for="skin-select">skins:</label>
                <select id="skin-select" name="skin" onchange="document.forms[0].submit()">
                    <option value="">Default</option>

                    <option value="simple">Simple</option>

                    <option value="bluebox">Bluebox</option>

                </select>
            </form>
        </div>
        <div class="service-overview">
            <div class="headline">Overview</div>
            <div class="title">Methods</div>
            <ul class="list">

                <li>
                    <a href="#add"><span class="entry">add</span></a>
                    ( )
                </li>

            </ul>
            <div class="title">Types</div>
            <ul class="list">

            </ul>
        </div>

        <div class="service-description">
            <div class="title">Description</div>
            <p class="doc-lines">
                This service does the math, and serves as example for new potential Ladon users.
            </p>
        </div>
        <div class="service-interfaces">
            <div class="title">Interfaces</div>
            <ul class="list">

                <li>soap11 [ <a href="http://ladonize.org/python-demos/Calculator/soap11">url</a> <a href="http://ladonize.org/python-demos/Calculator/soap11/description">description</a> ]</li>

                <li>jsonwsp [ <a href="http://ladonize.org/python-demos/Calculator/jsonwsp">url</a> <a href="http://ladonize.org/python-demos/Calculator/jsonwsp/description">description</a> ]</li>

                <li>soap [ <a href="http://ladonize.org/python-demos/Calculator/soap">url</a> <a href="http://ladonize.org/python-demos/Calculator/soap/description">description</a> ]</li>

            </ul>
        </div>
        <div class="service-api">
            <div class="methods">
                <div class="title">Methods</div>
                <ul class="list">

                    <li class="entry">
                        <div class="declaration">
                            <a name="add"></a><span class="name">add</span>
                            (



                            <span class="param-type">

                                number

                            </span> 
                            <span class="param-name">a</span>


                            , 
                            <span class="param-type">

                                number

                            </span> 
                            <span class="param-name">b</span>


                            )
                        </div>
                        <p class="doc-lines">
                            Add two integers together and return the result

                        </p>


                        <div class="params-title">Parameters</div>
                        <ul class="params">

                            <li>
                                <span class="param-name">a</span>: <span class="param-type">

                                    number

                                </span>

                                <br/>
                                <p class="doc-lines">
                                    1st integer
                                </p>
                            </li> 



                            <li>
                                <span class="param-name">b</span>: <span class="param-type">

                                    number

                                </span>

                                <br/>
                                <p class="doc-lines">
                                    2nd integer
                                </p>
                            </li> 

                        </ul>


                        <div class="return-type-title">Return value</div>
                        <div class="return-type">
                            <span class="param-type">

                                number

                            </span>
                            <p class="doc-lines">
                                The result of the addition
                            </p>
                        </div>
                    </li>

                </ul>
            </div>
            <div class="types">
                <div class="title">Types</div>
                <ul class="list">

                </ul>
            </div>
        </div>
        <div class="service-footer">Powered by Ladon for Python</div>
    </body>
</html>

Upvotes: 2

Views: 643

Answers (2)

Nevil Lad
Nevil Lad

Reputation: 533

This is working solution...

NSString *requestString = [NSString stringWithFormat:
                               @"http://ladonize.org/python-demos/Calculator/jsonwsp"];
    NSString *jsonString = [NSString stringWithFormat:@"{\"methodname\":\"add\",\"args\": {\"a\":123,\"b\":123}}"];
    //: {"methodname": "add", "args": {"a":"123","b":"123"}}
    NSLog(@"the request string is %@", requestString);
    NSData *jsonData = [NSData dataWithBytes: [jsonString UTF8String] length: [jsonString length]];


NSURL *url = [NSURL URLWithString:requestString];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:@"POST"];
[request setHTTPBody: jsonData];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
[request setValue:[NSString stringWithFormat:@"%d", [jsonData length]] forHTTPHeaderField:@"Content-Length"];

NSError *errorReturned = nil;
NSURLResponse *theResponse =[[NSURLResponse alloc]init];
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&theResponse error:&errorReturned];

if (errorReturned) {
    NSLog(@"Error %@",errorReturned.description);
}
else
{
    NSError *jsonParsingError = nil;
    NSMutableArray *arrDoctorInfo  = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers|NSJSONReadingAllowFragments error:&jsonParsingError];
    NSString* newStr = [NSString stringWithUTF8String:[data bytes]];
    NSLog(@"Dict %@",newStr);
}

Upvotes: 2

Wain
Wain

Reputation: 119031

It looks like the URL path you are using is wrong and should be changed to http://ladonize.org/python-demos/Calculator/jsonwsp.

A better way to create jsonData would be using dataUsingEncoding:.

You shouldn't be creating a response:

NSURLResponse *theResponse =[[NSURLResponse alloc]init];

Because it will be created and returned to you as part of the sendSynchronousRequest. What you should be doing is checking the contents of theResponse to verify the HTTP status code.

Upvotes: 2

Related Questions