c#取外部自绘listview的内容

如果你想获取外部应用程序中自绘 ListView 的内容，你需要使用 Windows API 来完成这个任务。以下是一个 C# 示例代码，演示如何获取另一个应用程序中的 ListView 内容：

using System;
using System.Runtime.InteropServices;
using System.Text;
 
public class NativeMethods
{
    [DllImport("user32.dll", SetLastError = true)]
    public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
 
    [DllImport("user32.dll", SetLastError = true)]
    public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
 
    [DllImport("user32.dll", SetLastError = true)]
    public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
 
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    public static extern int SendMessage(IntPtr hWnd, int wMsg, int wParam, StringBuilder lParam);
 
    [DllImport("user32.dll", SetLastError = true)]
    public static extern IntPtr GetDlgItem(IntPtr hDlg, int nIDDlgItem);
 
    [DllImport("user32.dll", SetLastError = true)]
    public static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);
 
    public const int LVM_FIRST = 0x1000;
    public const int LVM_GETITEMCOUNT = LVM_FIRST + 4;
    public const int LVM_GETITEMTEXT = LVM_FIRST + 45;
 
    public struct RECT
    {
        public int Left;
        public int Top;
        public int Right;
        public int Bottom;
    }
}
 
public class ListViewHelper
{
    public static int GetItemCount(IntPtr listViewHandle)
    {
        IntPtr result = NativeMethods.SendMessage(listViewHandle, NativeMethods.LVM_GETITEMCOUNT, IntPtr.Zero, IntPtr.Zero);
        return result.ToInt32();
    }
 
    public static string GetItemText(IntPtr listViewHandle, int itemIndex, int subItemIndex = 0)
    {
        StringBuilder sb = new StringBuilder(512);
        IntPtr result = NativeMethods.SendMessage(listViewHandle, NativeMethods.LVM_GETITEMTEXT, (IntPtr)itemIndex, sb);
        return sb.ToString();
    }
}
 
public class Program
{
    public static void Main()
    {
        string windowTitle = "Window Title";
        string listViewClassName = "SysListView32";
        IntPtr windowHandle = NativeMethods.FindWindow(null, windowTitle);
        IntPtr listViewHandle = NativeMethods.FindWindowEx(windowHandle, IntPtr.Zero, listViewClassName, null);
 
        if (listViewHandle != IntPtr.Zero)
        {
            int itemCount = ListViewHelper.GetItemCount(listViewHandle);
            Console.WriteLine("Item count: {0}", itemCount);
 
            for (int i = 0; i < itemCount; i++)
            {
                string itemText = ListViewHelper.GetItemText(listViewHandle, i);
                Console.WriteLine("Item {0}: {1}", i, itemText);
            }
        }
    }
}

在示例代码中，`NativeMethods` 类包含了一些 Windows API 函数的声明。`ListViewHelper` 类提供了两个用于获取 ListView 内容的静态方法。`Main` 方法中，我们首先使用 `FindWindow` 函数查找窗口句柄，然后使用 `FindWindowEx` 函数查找 ListView 句柄。如果找到了 ListView 句柄，我们可以使用 `GetItemCount` 和 `GetItemText` 方法获取 ListView 的项数和项文本。