error c# : operator == cannot be applied to operands of type 'System.IntPtr' and 'int

Hi All,

I get this error operator == cannot be applied to operands of type 'System.IntPtr' and 'int'

firstly I had this code

Code:

 private void SNGPH_KeyUp(object sender, KeyEventArgs e)
        {
            
        
            if (e.KeyCode != Keys.ControlKey)
                return;

            POINT curpos = new POINT();
            User32.GetCursorPos(ref curpos);
            IntPtr handle = User32.WindowFromPoint(curpos);
            handle = User32.GetAncestor(handle, 2);
            
            for (int i = 0; i < listBoxTables.Items.Count; i++)
                if (((PokerTable)listBoxTables.Items[i]).HWND == handle)
                {
                    listBoxTables.SelectedIndex = i;
                    setFormsAndDoCalc(true, null);
                    e.Handled = true;
                    return;
                }

            pictureBox1.Image = SystemIcons.Error.ToBitmap();
            labelWarning.Text = "Couldn't find selected window from pokertables";
        }

which is fine when you click control key over a table it then finds the table in the list (listboxtable) and executes it. Now I tried to make this into every foreground window to do the same thing and show handle in text bar.

Heres the code I get an error with

Code:

 private void GetActiveWindow()
        {
            const int nChars = 256;
            int handle = 0;
            StringBuilder Buff = new StringBuilder(nChars);
            handle = GetForegroundWindow();

            if (GetWindowText(handle, Buff, nChars) > 0)
            {
                this.textBox1.Text = handle.ToString();

                for (int i = 0; i < listBoxTables.Items.Count; i++)
                if (((PokerTable)listBoxTables.Items[i]).HWND == handle)
                {
                    listBoxTables.SelectedIndex = i;
                    setFormsAndDoCalc(true, null);
                    return;
                }
               
            }
        }

also used this to gain top window info (the text box displays each window handle fine btw)

Code:

         [ DllImport("user32.dll") ]

      static extern int GetForegroundWindow();

      [ DllImport("user32.dll") ]

      static extern int GetWindowText(int hWnd, StringBuilder text, int count);

Can anyone please help, not sure whats wrong the handle im sure is an int in both cases?

Thanks in advance!!

This is C forum. And it's C ONLY.

That is c#

oops I see can a mod please move

Moved as requested.

Try:

Code:

if (((PokerTable)listBoxTables.Items[i]).HWND.ToInt32() == handle)

Assuming HWND is an intptr

Or simply cast

Or declare GetForegroundWindow properly then it'll actually, you know, work. PInvoke.net has done the donkey work of converting the winapi signatures to their C# equivalents, no need to do it yourself.

thanks valaris that worked an absolute treat!!

Originally Posted by mxadam

thanks valaris that worked an absolute treat!!

No problem, but I didn't pay attention to your pinvoke signatures. adeyblue is right, you can have a better solution by just properly declaring your signature and let the runtime marshal.

Maybe a better question would be why are you even calling functions like SetForegroundWindow?

Maybe a better question would be why are you even calling functions like SetForegroundWindow?

There are many occasions where .NET does not offer some specific functionality found in the Win32 API. When this occurs you have no choice except to use P/Invoke or wrap some of the Win32 API calls in managed C++ and call through to the the actual API.

Originally Posted by Bubba

There are many occasions where .NET does not offer some specific functionality found in the Win32 API. When this occurs you have no choice except to use P/Invoke or wrap some of the Win32 API calls in managed C++ and call through to the the actual API.

Sure, I was just saying he should investigate rather or not this is really one of those cases.