为什么“FindWindowEx”找不到RichTextBox组件

时间:2018-06-01 08:07:46

标签: c# winforms winapi richtextbox findwindowex

我正在做一个自动程序(C#,而不是C ++),我需要在表单中获得一个RichTextBox。我使用Spy++来获取标题和类名,但FindWindowEx始终找不到RichTextBoxGetLastError得到单词0。然后这是一个简单的例子。

IntPtr parent = FindWindow(null, "Form1");
if (parent!=IntPtr.Zero) {
    //find test1 textbox
    IntPtr child = FindWindowEx(parent, 0,null,  "test1");
    if (child!=IntPtr.Zero) {
        SendMessage(child, 0x000c, 0, lParam:  "test");
    } else {
        Console.WriteLine("textbox can't be found");
    }
    //find test2 richtextbox
    IntPtr childRich = FindWindowEx(parent, 0, null, "test2");
    if (childRich != IntPtr.Zero) {
        SendMessage(child, 0x000c, 0, lParam: "test");
    } else {
        Console.WriteLine("richtextbox can't be found");
    }
} else {
    Console.WriteLine("Form1 can't be found");
}

https://i.stack.imgur.com/7eWil.png

但结果是richtextbox can't find。帮助我。

1 个答案:

答案 0 :(得分:-1)

我并不认为这是最好的方法,但它确实存在。

对于这种特定情况,您可以在表单中搜索所有处理程序,然后更改所需的处理程序。

var iHandle = Win32.FindWindow(null, "Form1");
var allItems = Win32.GetAllChildrenWindowHandles((IntPtr)iHandle, int.MaxValue);
Win32.SendMessage(allItems[1], 0x000c, 0, lParam: "Now you can change the text!");

我已经测试过,allItems [1]将永远是同一个项目,我认为这是winForm从上到下排序的方式。

我在Win方法中使用了第二个类:

public class Win32
{
    public const int WM_SETTEXT = 0X000C;

    public static List<IntPtr> GetAllChildrenWindowHandles(IntPtr hParent, int maxCount)
    {
        var result = new List<IntPtr>();
        int ct = 0;
        IntPtr prevChild = IntPtr.Zero;
        IntPtr currChild = IntPtr.Zero;
        while (true && ct < maxCount)
        {
            currChild = FindWindowEx(hParent, prevChild, null, null);
            if (currChild == IntPtr.Zero) break;
            result.Add(currChild);
            prevChild = currChild;
            ++ct;
        }
        return result;
    }

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

    [DllImport("User32.dll")]
    public static extern int FindWindow(string strClassName, string strWindowName);
}

修改:获取所有子窗口句柄的方法:https://jamesmccaffrey.wordpress.com/2013/02/03/getting-all-child-window-handles-using-c-pinvoke-findwindowex/