using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
namespace Pointers {
unsafe class Program {
static unsafe void Main( string[ ] args ) {
Unsafe unsafeObject = new Unsafe( 1, 2, 3, 4 );
Console.WriteLine(
"FirstLocation[ " + unsafeObject.firstLocation->ToString( ) + " ]\n" +
"SecondLocation[ " + unsafeObject.secondLocation->ToString( ) + " ]"
);
Console.Read( );
}
}
unsafe struct Unsafe {
public Safe* firstLocation, secondLocation;
public Unsafe( int fl_x, int fl_y, int sl_x, int sl_y ) {
Safe ffl = new Safe( fl_x, fl_y ),
fsl = new Safe( sl_x, sl_y );
this.firstLocation = &ffl;
this.secondLocation = &fsl;
}
}
struct Safe {
public int x, y;
public Safe( int x, int y ){
this.x = x;
this.y = y;
}
public override string ToString( ) {
return this.x + "," + this.y;
}
}
}
FirstLocation[ 1,2 ] SecondLocation[ 3,4 ]
FirstLocation[ 14,67169456 ] SecondLocation[ 19593296,19593248 ]
Refactorings
No refactoring yet !
Andre Steenveld
May 8, 2008, May 08, 2008 09:00, permalink
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I have found the problem. It appears that pointers to objects that are declared in the scope of a function don't stay alive after the function has returned. This other than in javascript for example.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
namespace Pointers {
class Program {
unsafe static void Main( string[ ] args ) {
Unsafe unsafeObject = new Unsafe( 1, 2, 3, 4 );
Console.WriteLine(
"FirstLocation[ " + unsafeObject.firstLocation->ToString( ) + " ]\n" +
"SecondLocation[ " + unsafeObject.secondLocation->ToString( ) + " ]"
);
Console.Read( );
}
}
unsafe struct Unsafe {
public Safe* firstLocation, secondLocation;
private Safe sfLocation, ssLocation;
public Unsafe( int fl_x, int fl_y, int sl_x, int sl_y) {
this.sfLocation = new Safe( fl_x, fl_y );
this.ssLocation = new Safe( sl_x, sl_y );
fixed( Safe* fl = &this.sfLocation )
fixed( Safe* sl = &this.ssLocation ) {
this.firstLocation = fl;
this.secondLocation = sl;
}
}
}
struct Safe {
public int x, y;
public Safe( int x, int y ){
this.x = x;
this.y = y;
}
public override string ToString( ) {
return this.x + "," + this.y;
}
}
}
I am trying to work out how unmanged objects work in C# but for some reason it looks like my objects arn't properly initized. Could someone help me out here?