Question

When trying to connect to the following web method, “Request format is invalid” is returned:

public string myWebMethod(string test)
{
    return "connected";
}

This is the objective C code:

NSString *seshID = @"test-session";       
NSString *post = [NSString stringWithFormat:@"test=%@", seshID];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];

NSString *comparisonURLString = SERVER_COMPARE_URL_STRING;
NSURL *comparisonURL = [NSURL URLWithString: comparisonURLString];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:comparisonURL];

[request setHTTPMethod:@"POST"];
[request addValue:postLength forHTTPHeaderField:@"Content-Length"];

NSHTTPURLResponse *urlResponse = nil;
NSError *error = nil;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];

NSString *response = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];    
NSLog(response);

However, if I alter the web method so that it takes no parameters:

public string myWebMethod()

And change the corresponding line in my obj-c code to:

NSString *post = [NSString stringWithFormat:@""];

It works, with the response:

<?xml version="1.0" encoding="utf-8"?>
<string xmlns="http://tempuri.org/">connected</string>

Can anyone explain why the latter seems to work but the former doesn’t? Thanks.

Answer 1

I’ve got a similar problem between JAVA WebMethod and C#. The problem was resolved by creating a class string1 inherant from SoapHeader and containing a string[].

Then for your example, you can try this

public string myWebMethod(string[] test)
{
    return "connected";
}

or

public string myWebMethod(char[] test)
{
    return "connected";
}

You can check too with Fiddler what kind of data is really passed.