AssertString function in C++

[Diana Chen]

Hello,

I have a question about the AssertString function being used in C++. I'm writing a c++ wrapper using clips. I'm fairly new to both c++ and clips, so I may be misunderstanding some fundamentals.

the section where I use AssertString looks like:

 if (true) {
      char *factptr =  &(fact[0]);
       EnvAssertString(theEnv, factptr);

I input a string "(color-red)" and the wrapper seems to throw no errors.

However, I'm not sure if this is correct or not. I tried using EnvGetFactsListschanged, but the CLIPS just returns a number.

Is there a way to print out the current list of facts in c++? Is there a standard template the AssertString function must have as an input?

thanks,

Diana

[CLIPS Support]

In your example it's not clear the type that fact[0] would be, but the simplest call you could make to use the EnvAssertString function would be

EnvAssertString(theEnv,"(color-red)");

You can use the EnvEval function to issue commands as if you had entered them at the CLIPS command prompt. Here's a simple example:

int main(

  int argc,

  char *argv[])

  {

   void *theEnv;

   DATA_OBJECT rv;

   theEnv = CreateEnvironment();

   

   EnvAssertString(theEnv,"(color-red)");

   EnvEval(theEnv,"(facts)",&rv);

      

   return 0;

[Diana Chen]

Hello,

thank you! the EnEval function is great. What is the rv object for?

Diana

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[CLIPS Support]

If the command has a return value, it’s stored in the DATA_OBJECT variable rv. The facts command has no return valuek, so nothing is going to be stored there, but if you did call a function that returned a value you’d look at that variable to retrieve the value. This is explained in greater detail in the CLIPS Advanced Programming Guide: http://www.clipsrules.net/Documentation.html

On Wednesday, June 3, 2020 at 4:19:47 PM UTC-5, Diana Chen wrote:

Hello,

thank you! the EnEval function is great. What is the rv object for?

Diana

Alternately, send email to CLIPSESG-unsubscribe@googlegroups.com. You will receive an email which you must respond to as well to unsubscribe. Clicking the link mentioned in the unsubscribe reply does not appear to work reliably.

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