[macrophyllum]

Hi,

I am trying to get my app to retrieve stock quotes using web services. I found this example in AppleScript, but my application is written in Cocoa and I don't know how to get return values from AppleScript into my Cocoa app.

So I did some more research and found an example in the Mac OS X Advanced Development Techniques book. Here is what my code looks like, very similar to the book's but with values from the AppleScript example above:

-(void)getStockQuote {
NSURL *soapURL;

soapURL = [NSURL URLWithString:@"http://services.xmethods.net:80/soap"];//[NSURL URLWithString: @"http://betty.userland.com/RPC2"];//

NSString *methodName = @"getQuote";

WSMethodInvocationRef soapCall;
soapCall = WSMethodInvocationCreate((CFURLRef) soapURL, (CFStringRef) methodName, kWSSOAP2001Protocol);


NSMutableDictionary *params;
NSMutableArray *paramsOrder;

params = [NSMutableDictionary dictionaryWithCapacity:1];
[params setObject:symbol forKey:@"symbol"];

paramsOrder = [NSArray arrayWithObjects:symbol, nil];

//set the method invocation parameters
//First parameter is the method invocation created above
//Second parameter is a dictionary containing parameters
//Thir pararmeter is an array specifying order of parameters, sometimes option for SOAP

WSMethodInvocationSetParameters(soapCall, (CFDictionaryRef)params, paramsOrder);

NSDictionary *result;

result = (NSDictionary *)WSMethodInvocationInvoke(soapCall);

if(WSMethodResultIsFault) {
NSLog(@"Error:");
NSLog([result description]);
} else {
NSLog(@"No Error:");
NSLog([result description]);
}

}

The problem is always get these errors in the returned result dictionary:

"/FaultCode" = -65794;
"/FaultExtra" = {domain = -1; error = -65795; msg = "HTTP/1.1 502 Proxy Error"; };
"/FaultString" = "/CFStreamFault";
"/kWSHTTPResponseMessage" = <NSCFType: 0x1cfd780>;
"/kWSResultIsFault" = 1;

SOAP is very new to me as is the CoreServices framework. Does anyone have any suggestions?

[Rickster]

This isn't quite my area, but I can point out something you might have overlooked. See the /Developer/Tools/WSMakeStubs command-line tool... supposedly, it writes the WebServices code for you if you give it a URL and method invocation info -- it can even spit out an ObjC class to wrap the service for you.

[macrophyllum]

Thanks for the tip Rickster. Unfortunately, I am not sure how to work with the WSMakeStubs command line tool. Anyone want to help walk me through using WSMakeStubs, maybe just a quick run down about how to use a command line tool?

Maybe I am stepping out of my league, but there is no better way to learn!

[Diggory Laycock]

You can get some info on the tool by running it:

Code:
/Developer/Tools/WSMakeStubs

Code:
/Developer/Tools/WSMakeStubs -x ObjC -name MyStockWebService -url http://services.xmethods.net/soap/ur...ed-quotes.wsdl

will generate the Stubs for the WebService you chose.

- x defines the Language they are generated in. -name sets the Name of the Stubs class Generated. -url passes the WDSL URI that specifies the webservice.

There will be more useful info here:

Code:
file:///Developer/Documentation/Networking/WebServices/index.html

[macrophyllum]

Thanks. I did the WSMakeStubs and found the source files that it created in my home directory. It looks like they might get me further down the track.

[macrophyllum]

Well, since I am very new to SOAP and suds (I mean stubs), I am coming back for more help.

I used the WSMakeStubs and it created two source files (and headers), called StockQuotes and WSGeneratedObj.

I then used this code, but I still get an error (see below):

WSMethodInvocationRef soapCall;
WSGeneratedObj *sq = [[WSGeneratedObj alloc] init];
soapCall = [sq
createInvocationRef: @"http://services.xmethods.net:9090/soap"
methodName: @"getQuote"
protocol: (NSString*) kWSSOAP2001Protocol
style: (NSString*) kWSSOAPStyleRPC
soapAction: @"urn:xmethods-delayed-quotes#getQuote"
methodNamespace: @"urn:xmethods-delayed-quotes"
];

NSString *symbol = @"APPL";
NSMutableDictionary *params;
NSMutableArray *paramsOrder;

params = [NSMutableDictionary dictionaryWithCapacity:1];
[params setObject:symbol forKey:@"symbol"];


paramsOrder = [NSArray arrayWithObjects:symbol, nil];

WSMethodInvocationSetParameters([sq getRef], (CFDictionaryRef)params, (CFArrayRef)paramsOrder);

NSDictionary *result;

result = (NSDictionary *)WSMethodInvocationInvoke(soapCall);

if(WSMethodResultIsFault) {
NSLog(@"Error:");
NSLog([result description]);
} else {
NSLog(@"No Error:");
NSLog([result description]);
}
[sq release];

/*END CODE*/

Here is the error:

"/FaultCode" = 0;
"/FaultString" = getQuote;
"/kWSHTTPResponseMessage" = <NSCFType: 0x1bc28a0>;
"/kWSResultIsFault" = 1;

Can anyone offer more help? (Thanks for all of the help up to this point). As you can see, I am really stumbling through this, but learning a lot!

[macrophyllum]

Ha-hah! Got it working. I didn't realized that inside the source file StockQuotes the class name is getQuote (note the lower case). I just called the setParameters and getResult methods on an instance of getQuote and it returned the values!

Thanks for all of the help.