Pro*C-returning boolean type from stored procedure

I'm following the practice to put common routines like connecting, disconnecting and dml in functions and put into library. This is good for debugging and maintenance.
  I am writing one c function for each stored procedure(created by dba) I need to call. For example:

   stored procedure:

   postMessage (p_SystemNm varchar2, p_MsgTxt varchar2) return boolean;

   in pro*c:

   void PostMessage(char sSystemNm, char *szMsgTxt){

     int tStatus;

     EXEC SQL EXECUTE 
       BEGIN 
         :tStatus := postMessage(:sSystemNm, :szMsgTxt);
       END;

   main() {

     :
     PostMessage('N', "Start running job inserting new customer.");
     :

  When I compile, I encountered the following problem:
:tStatus := postMessage(:sSystemNm, :szMsgTxt);
..............1
PLS-S-00382, expression is of wrong type
:tStatus := postMessage(:sSystemNm, :szMsgTxt);
...1
PLS-S-00000, Statement ignored

  Is this because integer type of tStatus?   What is the corresponding C datatype can I define to match with the boolean type in PLSQL?

  Thanks for any reply. Received on Tue Jun 26 2001 - 11:36:46 CEST