Fault string error while accessing web service in iOS - ios

Question

I am accessing xml web service in my iPhone application. But i am not able to get the appropriate data from the server. I am getting following error in connectionDidFinishLoading delegate method of NSURLConnection.
soap:ServerServer
was unable to process request. ---> Object reference not set to an
instance of an object.
Following is my code :
NSString *deviceID = [OpenUDID value];
NSString *soapMsg = [NSString stringWithFormat:
#"<?xml version=\"1.0\" encoding=\"utf-8\"?>"
"<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"
"<soap:Header>"
"<AuthHeader xmlns=\"http://tempuri.org/\">"
"<Username>admin</Username>"
"<Password>admin</Password>"
"</AuthHeader>"
"</soap:Header>"
"<soap:Body>"
"<WsGetAllDrugDetailsXML xmlns=\"http://tempuri.org/\">"
"<UserId>%d</UserId>"
"<IMEI>%#</IMEI>"
"</WsGetAllDrugDetailsXML>"
"</soap:Body>"
"</soap:Envelope>",[Appdelegate.UserID intValue],deviceID];
//---print it to the Debugger Console for verification---
NSLog(#"%#", soapMsg);
NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:Appdelegate.wsURL];
//---set the various headers---
NSString *msgLength = [NSString stringWithFormat:#"%d", [soapMsg length]];
[req addValue:#"text/xml; charset=utf-8" forHTTPHeaderField:#"Content-Type"];
[req addValue:#"http://tempuri.org/WsGetAllDrugDetailsXML" forHTTPHeaderField:#"SOAPAction"];
[req addValue:msgLength forHTTPHeaderField:#"Content-Length"];
//---set the HTTP method and body---
[req setHTTPMethod:#"POST"];
[req setHTTPBody:[soapMsg dataUsingEncoding:NSUTF8StringEncoding]];
conn = [[NSURLConnection alloc] initWithRequest:req delegate:self];
if (conn) {
webData = [[NSMutableData data] retain];
}
I'm not able to predict what is going wrong from my side. Or it is the error from server side that i'm not receiving the data.
Please help me.Thanks in Advance!

Answer 1

Your Content-Length value is not correct:
The length must be in bytes. NSString's length method returns the number of UTF-16 code units.
You may fix it as follows:
NSData* bodyData = [soapMsg dataUsingEncoding:NSUTF8StringEncoding];
[req addValue:[NSString stringWithFormat:#"%d",(int)[bodyData length]] forHTTPHeaderField:#"Content-Length"];
[req setHTTPBody:bodyData];