creating tasks at runtime

donundeen

Hi,
I'm trying to extract a portion of an image from mediabin, using the c# API.

I understand (I think) that I need to create a task, and load it with the correct primitives, parameters, and parameter elements.

But I'm really unclear on the specifics, and can't find anything in the documentation.

Can I get a bit of help?
Say, starting with an MBAsset object, given that we've got a MediaBinServer object, and I want a tile of the image, given x1, y1, x2, y2 coordinates, what would the code look like? Really I don't think my problem is specific to cropping; I'm having trouble just getting my hands on a task I can work with.


Here's what I've got so far:
public static byte[] getImageTile(spmiws00.MediaBinServer service, MBAsset asset, int tileX, int tileY, int tileWidth, int tileHeight)
{
string taskname = "theTaskName";

// array of primitives; these go to the task
MBPrimitive[] prims = new MBPrimitive[2];

// creating parameter element, setting values
MBParameterElement paraElem = new MBParameterElement();
paraElem.mName = "Output Width";
paraElem.mValue = tileWidth;

// creating parameter
MBParameter param = new MBParameter();
// initialize parameter element array:
param.mElements = new MBParameterElement[1];
// adding parameter element to parameter
param.mElements[0] = paraElem;

// creating primitive
MBPrimitive prim = new MBPrimitive();
// initializing parameters array in primitive
prim.mParameters = new MBParameter[1];
// adding parameter to primitive
prim.mParameters[0] = param;

// adding primitive to array of primitives:
prims[0] = prim;

service.CreateTaskCompleted += new CreateTaskCompletedEventHandler(onHandler);

service.CreateTask(taskname, "some description", prims);

MBTask task = service.GetTaskByName(taskname); // this never works, the task is always null
String taskid ="";
if (task != null)
{
taskid = task.mID;
}

// haven't gotten beyond this point; the task is always null here

// some magic goes here
}


public static void onHandler(object sender, CreateTaskCompletedEventArgs evt)
{
throw new Exception("got into handler!"); // this part never happens
}

fill in the blanks!

Is there a better way to do this? Do I need to create some sort of "task" in the mediabin client interface, then recall it here? How does this work?


Thanks for all your help!

donundeen

Hi, is this the right forum for this sort of question?
Badly phrased? Needs more detail?