C# 如何使用 WM_GETTEXT/GetWindowText API/窗口标题

问题描述

我想获取应用程序的控件/句柄的内容..

I want to get the content of the control / handle of an application..

这是实验代码..

 Process[] processes = Process.GetProcessesByName("Notepad");
        foreach (Process p in processes)
        {
            StringBuilder sb = new StringBuilder();
            IntPtr pFoundWindow = p.MainWindowHandle;
             List <IntPtr> s =    GetChildWindows(pFoundWindow);
            // function that returns a
            //list of handle from child component on a given application.

             foreach (IntPtr test in s)
             {
              // Now I want something here that will return/show
               the text on the notepad..


             }


            GetWindowText(pFoundWindow, sb,256);
            MessageBox.Show(sb.ToString()); // this shows the title.. no problem with that

        }

有什么想法吗?我已经阅读了一些 API 方法，如 GetWindowText 或 WM_GETTEXT，但我不知道如何使用它或将它应用到我的代码中.我需要教程或示例代码...

any idea?I've read some API method like GetWindowText or WM_GETTEXT but I dont know how to use it or apply it on my code..I need a tutorial or sample code...

提前致谢:)

推荐答案

public class GetTextTestClass{

    [System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "SendMessage", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
    public static extern bool SendMessage(IntPtr hWnd, uint Msg, int wParam, StringBuilder lParam);

    [System.Runtime.InteropServices.DllImport("user32.dll", SetLastError = true)]
    public static extern IntPtr SendMessage(int hWnd, int Msg, int wparam, int lparam);

    const int WM_GETTEXT       = 0x000D;
    const int WM_GETTEXTLENGTH = 0x000E;

    public string GetControlText(IntPtr hWnd){

        // Get the size of the string required to hold the window title (including trailing null.)
        Int32 titleSize = SendMessage((int)hWnd, WM_GETTEXTLENGTH, 0, 0).ToInt32();

        // If titleSize is 0, there is no title so return an empty string (or null)
        if (titleSize == 0)
            return String.Empty;

        StringBuilder title = new StringBuilder(titleSize + 1);

        SendMessage(hWnd, (int)WM_GETTEXT, title.Capacity, title);

        return title.ToString();
    }
}

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