C#学习教程：C＃如何使用WM_GETTEXT/GetWindowTextAPI分享

 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(); } } 

GetWindowText不会向您提供来自其他应用程序的编辑窗口的内容 &＃8211; 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&＃8230;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); 

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。

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