通过 user32.dll 在 Listbox 中选择 CheckBoxes？ (

Posted 2023-02-19

【中文标题】通过 user32.dll 在 Listbox 中选择 CheckBoxes？ (

【英文标题】：Select CheckBoxes in Listbox via user32.dll? (

【发布时间】：2019-03-12 08:27:06

【问题描述】：

我有一个来自外部应用程序的 ListBox 句柄。

现在我有一个包含 x 个项目的列表框，我想用 WinApi 选择它。

我用 SETCURSEL 试过这个，但不幸的是它不起作用：

private void button2_Click(object sender, EventArgs e)

    IntPtr chldWnd = NativeMethods.FindWindow("#32770", "Ansichten einfügen");
    IntPtr ListBoxHandle = NativeMethods.FindWindowEx(chldWnd, IntPtr.Zero, "ListBox", null);
    //MessageBox.Show(ButtonHandle.ToString());
    NativeMethods.SendMessageInt(ListBoxHandle, NativeMethods.CB_SETCURSEL, 1, 2);


static class NativeMethods

    public const int BM_CLICK = 0x00F5;
    public const int WM_SETTEXT = 0x000C;
    public const int VK_DOWN = 0x28;
    public const int WM_KEYDOWN = 0x100;
    public const int LB_SETSEL = 0x0185;
    public const int CB_SETCURSEL = 0x014E;

    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    public static extern IntPtr SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, string lParam);
    [DllImport("user32.dll", EntryPoint="PostMessage" ,CharSet = CharSet.Unicode)]
    public static extern IntPtr SendMessageInt(IntPtr hWnd, uint Msg, int wParam, int lParam);

    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    public static extern IntPtr PostMessage(IntPtr hwnd, int wsg, IntPtr wParam, String lParam);

    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className, string windowTitle);

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

【参考方案1】：

相信我的使用方式能满足你在ListBox上鼠标点击选择项目的需求，请尝试一下。

 [DllImport("user32.dll")]
 private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);

 public void SetListItem(string windowTitle, int index, int item)
        
            try
            
                var windowHWnd = FindWindowByCaption(IntPtr.Zero, windowTitle);
                var childWindows = GetChildWindows(windowHWnd);
                const int LB_SETCURSEL = 0x0186;
                const int downCode = 0x201;
                const int upCode = 0x202;
                IntPtr lParam = (IntPtr)9999; // The coordinates
                IntPtr wParam = IntPtr.Zero;

                SendMessage(childWindows.ToArray()[index], LB_SETCURSEL, item, "0");

                SendMessage(childWindows.ToArray()[index], downCode, wParam, lParam); // Mouse button down
                SendMessage(childWindows.ToArray()[index], upCode, wParam, lParam);
            
            catch (Exception)
            
                throw;