RE: [C++] Reading UserDataBlob as JSON String

[Matt Lind]

Is the JSON string ASCII, Unicode, wide string, etc..?  That alone might be the 
problem.

Can you give an example of what's stored in the userdatablob and what gets 
logged when you attempt LogMessage() and don't crash?


Matt





From: softimage-boun...@listproc.autodesk.com 
[mailto:softimage-boun...@listproc.autodesk.com] On Behalf Of Jeremie Passerin
Sent: Monday, February 03, 2014 5:47 PM
To: softimage
Subject: [C++] Reading UserDataBlob as JSON String

Hi List,


My coworker Tyler is writing his first Cpp solver and we are having a hard time 
reading value from a userdatablob.

The data blob is created and filled by a Python script. The data is a 
dictionary stored as a Json string. The value is static.

>From the C++ solver we connect this datablob to an inputport to read it's 
>value.

As a test we just tried to log the string value of the datablob, but it either 
crashes or doesn't log what we were expecting. In the following example it 
crashes.

Any idea what we are doing wrong ?

thanks,

Jeremie

CStatus simplexCPP_Update( CRef& in_ctxt ){

     OperatorContext ctxt(in_ctxt);
     Application app;
     Operator op(ctxt.GetSource());

     CValue blob = ctxt.GetInputValue(0,2,0);
     app.LogMessage(blob.GetAsText());

     const unsigned char *x = NULL;
     UserDataBlob b = UserDataBlob(blob);
     unsigned int size = 0;
     b.GetValue(x,size);

     CString * cstr = (CString*) x;
     app.LogMessage(*cstr);

     return CStatus::OK;
}