[1480] in java-interest
Invoking Java methods in C++
daemon@ATHENA.MIT.EDU (Imran Balkhi (NT))
Tue Sep 5 20:12:13 1995
Date: Tue, 5 Sep 1995 11:45:21 -0700
From: ibalkhi@dnt.dialog.com (Imran Balkhi (NT))
To: java-interest@java.sun.com
Hi everyone,
I am trying to invoke Java method from native C++ function.
//start java code
class son {
static int y = 5;
son() {
y = y + 1;
System.out.print("........in son constructor \n");
}
void print(){
System.out.print("........in son print \n");
}
void finalize() {
System.out.print ("......in son destructor \n");
}
}
class parent {
public native son mySon(son s);
parent () {
System.out.print ("........in parent constructor \n");
}
public static void main(String args[]) {
parent x1 = new parent();
son s1 = new son();
son s2;
System.out.print ("........in parent main after call son constructor \n");
System.out.println (s1);
s2 =x1.mySon(s1);
System.out.print ("........in parent main after call myson \n");
System.out.println (s2);
s1.finalize();
}
}
//end java code
// start native function
struct Hson *parent_mySon(struct Hparent *obj, struct Hson *SonObject){
ClassClass *sonClass = FindClass (0,"son",TRUE);
Hjava_lang_Object *localson = execute_java_constructor(0,"son",sonClass,"()");
execute_java_dynamic_method (0,
(Hjava_lang_Object *) print, // real_native.cc, line 161:
"handle",
"()",
localson);
return ((Hson *)localson);
}
//end native function
// ERROR in native function
"real_native.cc", line 161: Error: print is not defined.
// tried to replace print with finalize, but got the same error.
"real_native.cc", line 161: Error: finalize is not defined.
NOTE: 1) If call to execute_java_dynamic_method(..) is commented out then it compiles and executes. Also in this case son constructor is called from native myson.
2) I tried to replace localson with SonObject in execute_java_dynamic_method(..) call, but got the same error.
3) I am not very clear about method signatures. With no argument its easy to figure. Can somebody let me know how would I call a java method/constructor with arguments. Please give example.
Thank's
Imran
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