Rochdi, when you say you've figured out how to save it to C:\Temp\filename.csv, are you saying you have it saved on the client, or on the server?

If it's saving the file on the server, you can create a class that extends %CSP.StreamServer, then override the OnPreHTTP and OnPage class methods like this for simple text files:

 Class fileserver Extends %CSP.StreamServer
{ 
ClassMethod OnPreHTTP() As %Boolean
{
do %response.SetHeader("Content-Type","text/csv")
do %response.SetHeader("Content-Disposition","attachment;filename=""myfile.csv""")
quit 1
} 
ClassMethod OnPage() As %Status
{
set file = ##class(%File).%New("/path/to/file.csv")
do file.Open("R")
while file.AtEnd '= 1{
write file.ReadLine(),!
}
quit $$$OK
} 
}

and then just link to it that page to download.

Once you get to things that aren't plain text, it gets a little more complicated, but this should work for a simple csv.

Your result set should be an EnsLib.SQL.GatewayResultSet, which has a method called GetSnapshot(). That method has you pass a EnsLib.SQL.Snapshot by reference. You're probably going to want to set the FetchAll parameter on the GetSnapshot() method to 1 so it gets all the results, but you can also create your EnsLib.SQL.Snapshot before using GetSnapshot() and set it's starting row and max rows if you'd like. Then you can iterate over the snapshot instead of the result set. Once you've gone through it once, you could either create a new snapshot by calling the GetSnapshot() method again, or you can use the snapshot's Rewind() method.

According to this page, if it's something that still in development, you can use the CleanProduction() method to clear the message queues. Using it in a live system isn't recommended because it clears out everything pretty indiscriminately, but it's useful for debugging.

Productions get the suspend status when after shutting down there are still synchronous messages that could not be processed.

You'll need the resource %Admin_Task to use task manager functions.

Once you have access to it, set up a class that extends %SYS.Task.Definition and override the OnTask() method. Then you can set it up in the task scheduler and it'll run the OnTask() method according to whatever schedule you set.

At the bottom of the pane you showed in your screenshot, there should be a few tabs. If you're on the "Project" tab and haven't added any classes to your project, it would look like that. If you switch it to the "Namespace" tab, you should see everything.

MAXSTRING usually indicates that you're exceeding the maximum possible length of a string somewhere. Are you sure it's a problem with the %Stream.GlobalCharacter, and not a different string variable in your program? Global character streams shouldn't have that problem.

You can see what the maximum length of a string is on your system by opening a terminal and running:

write $SYSTEM.SYS.MaxLocalLength()

One of the properties of the %SOAP.WebClient class is HttpRequest which is an instance of %Net.HttpRequest. You might need to set the content type of that HttpRequest. So where you have "..ContentType", try "..HttpRequest.ContentType"?

The maximum URI size in Apache is usually 8,177 characters, but increasing that isn't the problem. Somewhere in your program, the value of your input is getting appended onto the URI, and it shouldn't be. Can you see anywhere that your program might be doing that?