Computer Science Canada

pointes in VB
Author:  liangchenen [ Mon Oct 03, 2005 11:00 pm ]
Post subject:  pointes in VB
how to make a pointer in VB.

Also, how do you pass by reference in VB?
Author:  wtd [ Tue Oct 04, 2005 1:12 am ]
Post subject: 
VB6 or VB.NET?

For VB.NET, to pass by reference, you'd have something like:

code:
Sub Foo(ByRef a As Integer)
   ' ...
End Sub


Pointers you don't really have.
Author:  Monstrosity_ [ Tue Oct 04, 2005 12:01 pm ]
Post subject:  Re: pointes in VB
liangchenen wrote:
how to make a pointer in VB.

Also, how do you pass by reference in VB?

In VB6 (not sure about .NET) there are three undocumented functions

VarPtr: Gives the memory address of a variable
StrPtr: Gives the memory address of the contents of a string
ObjPtr: Gives the memory address of the object
Author:  liangchenen [ Tue Oct 04, 2005 2:45 pm ]
Post subject: 
what if I have something like this:

code:

void add( int a [500]. int b[500])
{
 int x;
 for (x=0;x<500;x++)
 {
  a[x] += b[x];
 }
}

int main()
{ 
 int num1[500];
 int num2[500];
 add (num1,num2);
 return 0;
}


This is code in C++, in the function, I pass the pointer of the array num1[500] and num2[500] into the function, so, when I add a[500] and b[500], I am actually manipulate arrays num1 and num2.

Can you show me how it is done in VB6.?
thx a lot
Author:  wtd [ Tue Oct 04, 2005 4:45 pm ]
Post subject: 
Google is your friend, as is MSDN.
Author:  Monstrosity_ [ Tue Oct 04, 2005 7:48 pm ]
Post subject: 
liangchenen wrote:
I pass the pointer of the array num1[500] and num2[500] into the function, so, when I add a[500] and b[500], I am actually manipulate arrays num1 and num2.

Can you show me how it is done in VB6.?
thx a lot

In this case you dont need to worry about pointers, just as wtd had mentioned earlier, look up how to pass by refrence instead of by value.

:


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