Saving image data from csp
I created a csp that will capture image data from a html canvas element. I created a button element to save the contents as a dataURL string from jpeg and make a server call.
the string is too long
.png)
I would appreciate any suggestions in saving the data into the server, currently just a global.
Caché has a nice example in namespace SAMPLES how to upload a stream of any length:
/csp/samples/upload.csp.
The best way of doing this is to create a class with a single property 'property Data as %BinaryStream'
class MyData extends %Persistent
{
property Data as %BinaryStream;
}
Then, I assume you you have a class that inherits from %CSP.REST (assume it is called MyRestClass) and in the XDATA Routes block define a route definition
<Route Url="/myapp" Method="POST" Call="SaveData" />
where /myapp is a Web Application defined in Management Portal -> System Administration -> Security -> Applications -> Web Applications. When you define the application specify the application URL ("/myapp"), the namespace where your data is going to be saved, and in the field "Dispatch Class" specify "MyRestClass" and then Save the Web Application Definition.
in your REST Class(MyRestClass) define a class method
classmethod SaveData() as %Status
{
set tSC=$$$OK
try {
set obj=##class(MyData).%New()
set tSC=obj.Data.CopyFrom(%request.Content) if 'tSC quit
set tSC=obj.%Save() if 'tSC quit
}
catch ex {set tSC=ex.AsStatus()}
quit tSC
}
This is just one approach. As Robert suggests below there are a number of ways of manipulation images in CSP but my example is one that I have used before