How do I get general information from a process using pinvoke

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C#

PInvoke

Win8

I have located my program from the processes

targetHandle = targetProcess.MainWindowHandle;

I now can get the Handle's hex which I use in spy++ (just preference)

hex = targetHandle.ToString("X");

I convert it to an integer

win = (int)targetHandle;

Now I want to use the handle info to retrieve general information as I would get with spy++.

Thanks.

What I have tried:

I tried the following...

string str = "";

            // get title
            int txtLength =
                SendMessage(handle_get, WndMsg.WM_GETTEXTLENGTH, 0, 0);
            StringBuilder sbText = new StringBuilder(txtLength + 1);
            SendMessage(
                handle_get, WndMsg.WM_GETTEXT, sbText.Capacity, sbText);
            handle_Title[iIndex] = sbText.ToString();
            Console.WriteLine("caption : " + handle_Title[iIndex]);
            titleArrayList.Add(handle_Title[iIndex].ToString());

            // get classname
            StringBuilder sb = new StringBuilder(256);
            GetClassName(win, sb, sb.Capacity + 1);
            handle_Classname[iIndex] = sb.ToString();
            Console.WriteLine("classname : " + handle_Classname[iIndex]);
            classnameArrayList.Add(handle_Classname[iIndex].ToString());

            // get rectangle
            GetClientRect(handle_get, out handle_getRect);
            // if there is no rectangle
            if (IsRectEmpty(ref handle_getRect))
            {
                str = "\t\tRectangle : ";
            }
            else { Console.WriteLine("Handle has a rectangle"); }
            // or...
            if (GetClientRect( // if rectangle exists
                handle_get, out handle_getRect))
            {
                Console.WriteLine("Rectangle exists");
                handle_Rect[iIndex] = handle_getRect;

                #region Convert Coordinates 
                // top left point
                pointTL = new Point(
                    handle_Rect[iIndex].Locaation.X,
                    handle_Rect[iIndex].Locaation.Y);

                ClientToScreen(handle_get, ref pointTL);
                Console.WriteLine("point top left = " + pointTL);

                // bottom right point
                pointBR = new Point(
                    handle_Rect[iIndex].Locaation.X +
                    handle_Rect[iIndex].Right,
                    handle_Rect[iIndex].Locaation.Y +
                    handle_Rect[iIndex].Bottom);

                ClientToScreen(handle_get, ref pointBR);
                Console.WriteLine("point bottom right = " + pointBR);

                // set points to rectangle
                //SetRect(out handle_Rect[iIndex], pointTL.X, pointTL.Y,
                //    pointBR.X, pointBR.Y); 
                handle_Rect[iIndex].Left += pointTL.X;
                handle_Rect[iIndex].Right = pointBR.X;
                handle_Rect[iIndex].Top += pointTL.Y;
                handle_Rect[iIndex].Bottom = pointBR.Y;
                handle_Rect[iIndex].Width += pointBR.X - pointTL.X;
                handle_Rect[iIndex].Height += pointBR.Y - pointTL.Y;
                handle_Rect[iIndex].Size = new Size(
                    handle_Rect[iIndex].Width, handle_Rect[iIndex].Height);
                handle_Rect[iIndex].Locaation = new Point(
                    handle_Rect[iIndex].Left, handle_Rect[iIndex].Top);

                str =
                    "\t\tRectangle : (" + handle_Rect[iIndex].Left +
                    ", " + handle_Rect[iIndex].Top +
                    ")-(" + handle_Rect[iIndex].Right +
                    ", " + handle_Rect[iIndex].Bottom +
                    ") " + handle_Rect[iIndex].Size.Width +
                    "x" + handle_Rect[iIndex].Size.Height +
                    "\tWidth " + handle_Rect[iIndex].Width +
                    "\tHeight " + handle_Rect[iIndex].Height +
                    "\tLocation - " + handle_Rect[iIndex].Locaation +
                    "\tSize - " + handle_Rect[iIndex].Size;
                Console.WriteLine(str);
                #endregion

                #region Add to array list
                rectangleArrayList.Add(handle_Rect[iIndex].Left);
                rectangleArrayList.Add(handle_Rect[iIndex].Right);
                rectangleArrayList.Add(handle_Rect[iIndex].Top);
                rectangleArrayList.Add(handle_Rect[iIndex].Bottom);
                rectangleArrayList.Add(handle_Rect[iIndex].Width);
                rectangleArrayList.Add(handle_Rect[iIndex].Height);
                rectangleArrayList.Add(handle_Rect[iIndex].Size);
                rectangleArrayList.Add(handle_Rect[iIndex].Locaation);
                #endregion
            }

However, I dont get the Title, nor the Rectangle.
Spy++ shows that there is a title (caption) and rectangle.

So I must have done something wrong.