How do I call PBNI methods from Powerbuilder, using method ID - c++

Question

I am creating a c++ PBNI non-visual extension, calling it from powerbuilder like this :
textbox1.text = string (cpp_add.f_add(integer(textbox2.text), integer(textbox3.text)))
PBX_GetDescription() has one class and two functions described this way:
"class pbadd from nonvisualobject \n" \
"function int f_add(int a, int b)\n" \
"function int f_add2(int a, int b)\n" \
"end class \n"
Header:
#include "pbext.h"
class pbadd : public IPBX_NonVisualObject
{
public:
pbadd();
virtual ~pbadd();
PBXRESULT Invoke(
IPB_Session *session,
pbobject obj,
pbmethodID mid,
PBCallInfo *ci);
int f_add(IPB_Session*, pbint, pbint);
int f_add2(IPB_Session*, pbint, pbint);
enum MethodIDs
{
mAdd = 1,
mAdd2 = 2
};
private:
virtual void Destroy();
};
And the required Invoke method:
PBXRESULT pbadd::Invoke(IPB_Session *Session,
pbobject obj, pbmethodID mid, PBCallInfo *ci)
{
if (mid == mAdd)
{
int sum = f_add(Session, ci->pArgs->GetAt(0)->
GetInt(), ci->pArgs->GetAt(1)->GetInt());
ci->returnValue->SetInt(sum);
}
if (mid == mAdd2)
{
int sum = f_add2(Session, ci->pArgs->GetAt(0)->
GetInt(), ci->pArgs->GetAt(1)->GetInt());
ci->returnValue->SetInt(sum+1);
}
return PBX_OK;
}
Now the problem is: I have no clue how to call second of the two methods. I am assuming I can somehow change the pbmethod mid, but I do not know how to do so from powerbuilder.

Answer 1

Did you in PowerBuilder right click the library and choose 'Import PB Extension'? Doing that creates a 'shell' object that you use in your PB script and it automatically calls the Invoke method passing the method id.

Answer 2

Apparently the problem was here:
enum MethodIDs
{
mAdd = 1,
mAdd2 = 2
};
The IDs are counted from 0. Correct:
enum MethodIDs
{
mAdd = 0,
mAdd2 = 1
};