C＃如何使用WM_GETTEXT / GetWindowText API

我想获得应用程序的控件/句柄的内容..

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  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 } 

任何的想法？ 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其应用于我的代码..我需要一个教程或示例代码…

提前致谢 ： ）

Answer 1

 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(); } } 

Answer 2

GetWindowText不会向您提供来自其他应用程序的编辑窗口的内容 – 它只支持跨进程的默认管理文本 [如标签的标题]以防止挂起…您必须发送WM_GETTEXT。

您需要使用StringBuilder版本的SendMessage：

 [DllImport("user32.dll", CharSet = CharSet.Auto)] static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, [Out] StringBuilder lParam); const int WM_GETTEXT = 0xD; StringBuilder sb = new StringBuilder(65535); // needs to be big enough for the whole text SendMessage(hWnd_of_Notepad_Editor, WM_GETTEXT, sb.Length, sb); 

Answer 3

请查看http://pinvoke.net/default.aspx/user32/GetWindowText.html以及MSDN上的文档。 下面是一个如何使用GetWindowText方法的简短代码示例。