array function argument

pixienick · #1 01-Sep-2005, 08:00

Hi
i know this is kind of an old question but i'm having real difficulty getting an array into a function and copying it to somewhere else. The problem is compounded by the fact the array is a class CPoint and the function is a member of a CDoc derivative being called from a CView derivative. It looks like this;

CPP / C++ / C Code:

void CStereoScopicDoc::NewPoly(int viewAB, CPoint points[], int selectedNum)
{
    //this bits alright *******************
	PolySelect *pTemp = pPolyList;

	while(pTemp->done)
	{
		if(pTemp->next)
			pTemp = pTemp->next;
		else
			break;
	}
	
	//its just here
	pTemp->Enter(PolySelectNum, viewAB, points, selectedNum);
	


}

as you can see i'm passing the array again to another function of another class, but i think the problem has already occurred. Looking at the watch window in debug the array is filled before it is passed to this function, but the points[] array in this function only appears to have the first element. Here's a bit of the Enter function of the 'PolySelect' class;

CPP / C++ / C Code:

void PolySelect::Enter(int in_ID, int viewAB, CPoint points[], int num)
{
	ID = in_ID;

	pointNum = num;

	if(viewAB == 1)
	{
		//imID_A = imID;
		selectA = new CPoint[num];

               //its here where it all goes wrong!!
		for(int i=0; i<num; i++)
		{
			selectA[i] = points[i];
		}
		doneA = true;
	}
//etc

You see i want to copy the data over not just pass the pointer. Can anyone tell me where i'm going wrong? And, just to check, it is true that declaring a function parameter as a pointer is the same as declaring it like an array? The program compiles and runs but dosen't do what i want.
Once again, any help much appreciated.
Nick

Kacyndra · #2 01-Sep-2005, 09:57

hey
what are you trying to do by this:

Code:

pTemp->Enter(PolySelectNum, viewAB, points, selectedNum);

hm........ i'v never seen anyone call a function this way before.

pixienick · #3 02-Sep-2005, 04:34

Well you haven't done alot of c++ then have you?

pTemp is a pointer to an object of type PolySelect, you see it declared like

CPP / C++ / C Code:

PolySelect *pTemp

Because it's a pointer and not an actual piece of data you refer to it's member functions and variables with -> instead of a dot. So 'Enter' is a member function of PolySelect and the rest of it is the function arguments.
Funky init?
Know anything about passing arrays to functions, by the way?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Rate This Thread
Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[Include] Doubly-linked List	dsmith	C Programming Language	6	14-Apr-2006 13:12
Pointer Usage in C++: Beginner to Advanced	varunhome	CPP / C++ Forum	0	19-Aug-2005 09:25
template comiling problems - need expert debugger!	crq	CPP / C++ Forum	1	01-Feb-2005 21:26
Revising Script style ??????	pepee	MySQL / PHP Forum	4	14-Apr-2004 04:59