simple asynch web request question

[mt404]

Hi everyone, I have what I think is a simple question concerning
making an asynchronous web request using the BeginGetResponse /
EndGetResponse methods of httpWebRequest.

My app needs to fire off a bunch (possibly thousands) of http requests
at once. Each request calls a java servlet which places a telephone
call. I need to examine the stream returned and do a simple SQL
update to log the status of the call. Unfortunately the info returned
by the servlet is pretty minimal and doesn't include any information
other than success, busy, no_answer, etc..

What I need to be able to do is identify which call each status
message relates to. However, I can't quite figure out how to do this
=( Is the state object what I should be paying attention to here? Is
there a way to make the phone number available to the callback
delegate that is receiving the response stream?

For instance to initate the request:

----------
string URI = "http://xxx.xxxx.com/connect-Phone?phone_number=555-555-5555";

HttpWebRequest req = (HttpWebRequest) WebRequest.Create(fullURI);

RequestState myRequestState = new RequestState(notificationId);

myRequestState.request = req;

IAsyncResult result = (IAsyncResult) req.BeginGetResponse(new
AsyncCallback(RespCallback),myRequestState);
------------

How can I get the 555-555-5555 as a variable to use in my SQL queries
held within RespCallback?


Many many thanks for any help anyone can offer!

 

[Sorin Dolha [MCSD]]

MT404,

Yes, it's the state object you need to use.
See this articles from MSDN to understand how it is done.

--
Sorin Dolha [MCP, MCAD, MCSD]
Hi everyone, I have what I think is a simple question concerning
making an asynchronous web request using the BeginGetResponse /
EndGetResponse methods of httpWebRequest.

My app needs to fire off a bunch (possibly thousands) of http requests
at once. Each request calls a java servlet which places a telephone
call. I need to examine the stream returned and do a simple SQL
update to log the status of the call. Unfortunately the info returned
by the servlet is pretty minimal and doesn't include any information
other than success, busy, no_answer, etc..

What I need to be able to do is identify which call each status
message relates to. However, I can't quite figure out how to do this
=( Is the state object what I should be paying attention to here? Is
there a way to make the phone number available to the callback
delegate that is receiving the response stream?

For instance to initate the request:

----------
string URI = "http://xxx.xxxx.com/connect-Phone?phone_number=555-555-5555";

HttpWebRequest req = (HttpWebRequest) WebRequest.Create(fullURI);

RequestState myRequestState = new RequestState(notificationId);

myRequestState.request = req;

IAsyncResult result = (IAsyncResult) req.BeginGetResponse(new
AsyncCallback(RespCallback),myRequestState);
------------

How can I get the 555-555-5555 as a variable to use in my SQL queries
held within RespCallback?


Many many thanks for any help anyone can offer!

 

[mt404]

MT404,

Yes, it's the state object you need to use.
See this articles from MSDN to understand how it is done.

Sorin,

I was able to get things working exaclty how I was hoping by creating
a class which I passed the data I needed to access in the callback
delegate to. I then used an instance of this class as the state
object for the async web request, and voila, I had everything working
exactly as I was hoping.

Thanks for confirming that I was barking up the right tree.

-Matt