如何从不同的程序读取另一个窗口

我尝试过findwindow and process但它不起作用，我怎样才能找到特定的按钮？

例如我有按钮类AfxWnd90u和instance 21。我想检查这个按钮是否可见。我用这段代码尝试过，但找不到按钮。我想我在这个例子上犯了一个错误。

之间我没有使用findwindow在这里因为我做了一点实验。

//////IMPORTANT/////////////
System.Diagnostics.Process[] move = System.Diagnostics.Process.GetProcessesByName("PartyGaming");
ArrayList save = new ArrayList();
RECT rct = new RECT();
listBox1.Items.Add(move.Length);
List<System.Diagnostics.Process> process = new List<System.Diagnostics.Process>();

// use only the process with the button AfxWnd90u21
for (int i = 0; i < move.Length;++i ) 
{
    IntPtr hCheck = FindWindowEx(move[i].MainWindowHandle, IntPtr.Zero, "AfxWnd90u21", null);
    //if button is visible
    if (hCheck != IntPtr.Zero)
        process.Add(move[i]);

    //////IMPORTANT/////////////
}

我相信FindWindow和SendMessage Windows API函数的结合会给你带来你想要的。棘手的部分是发现窗口类名称，但像 WinSpy++ 这样的东西可以帮助你。

以下是如何使用 API 的示例。打开 Notepad.exe 几次，输入一些文本，然后运行此示例。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            List<WinText> windows = new List<WinText>();

            //find the "first" window
            IntPtr hWnd = FindWindow("notepad", null);

            while (hWnd != IntPtr.Zero)
            {
                //find the control window that has the text
                IntPtr hEdit = FindWindowEx(hWnd, IntPtr.Zero, "edit", null);

                //initialize the buffer.  using a StringBuilder here
                System.Text.StringBuilder sb = new System.Text.StringBuilder(255);  // or length from call with GETTEXTLENGTH

                //get the text from the child control
                int RetVal = SendMessage(hEdit, WM_GETTEXT, sb.Capacity, sb);

                windows.Add(new WinText() { hWnd = hWnd, Text = sb.ToString() });

                //find the next window
                hWnd = FindWindowEx(IntPtr.Zero, hWnd, "notepad", null);
            }

            //do something clever
            windows.OrderBy(x => x.Text).ToList().ForEach(y => Console.Write("{0} = {1}\n", y.hWnd, y.Text));

            Console.Write("\n\nFound {0} window(s).", windows.Count);
            Console.ReadKey();
        }

        private struct WinText
        {
            public IntPtr hWnd;
            public string Text;
        }

        const int WM_GETTEXT = 0x0D;
        const int WM_GETTEXTLENGTH = 0x0E;

        [DllImport("user32.dll", SetLastError = true)]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern int SendMessage(IntPtr hWnd, int msg, int Param, System.Text.StringBuilder text);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

    }
}