让我说我有窗口的处理程序包含所选的文本..
我只需要从这个窗口中获取所选文本。
我知道我们可以使用 SendMessage()API 和 EM_GETSEL 常量执行此操作,但我真的很困惑如何做到这一点!
答案 0 :(得分:0)
WM_GETTEXT
消息可以帮助您 -
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace TextFocusedns
{
public partial class TextFocusedFrm : Form
{
#region APIs
[DllImport("user32.dll")]
public static extern bool GetCursorPos(out Point pt);
[DllImport("user32.dll", EntryPoint = "WindowFromPoint", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern IntPtr WindowFromPoint(Point pt);
[DllImport("user32.dll", EntryPoint = "SendMessageW")]
public static extern int SendMessageW([InAttribute] System.IntPtr hWnd, int Msg, int wParam, IntPtr lParam);
public const int WM_GETTEXT = 13;
[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
internal static extern IntPtr GetForegroundWindow();
[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
internal static extern IntPtr GetFocus();
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
internal static extern int GetWindowThreadProcessId(int handle, out int processId);
[DllImport("user32", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
internal static extern int AttachThreadInput(int idAttach, int idAttachTo, bool fAttach);
[DllImport("kernel32.dll")]
internal static extern int GetCurrentThreadId();
[DllImport("user32", CharSet = CharSet.Auto, SetLastError = true)]
internal static extern int GetWindowText(IntPtr hWnd, [Out, MarshalAs(UnmanagedType.LPTStr)] StringBuilder lpString, int nMaxCount);
#endregion
private System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer() { Interval = 100, Enabled = true };
public TextFocusedFrm()
{
InitializeComponent();
}
private void TextFocusedFrm_Load(object sender, EventArgs e)
{
timer.Tick += new EventHandler(timer_Tick);
timer.Start();
}
void timer_Tick(object sender, EventArgs e)
{
try
{
MultiLineTextBox.Text = GetTextFromFocusedControl();
}
catch (Exception exp)
{
MultiLineTextBox.Text += exp.Message;
}
}
//Get the text of the focused control
private string GetTextFromFocusedControl()
{
try
{
int activeWinPtr = GetForegroundWindow().ToInt32();
int activeThreadId = 0, processId;
activeThreadId = GetWindowThreadProcessId(activeWinPtr, out processId);
int currentThreadId = GetCurrentThreadId();
if (activeThreadId != currentThreadId)
AttachThreadInput(activeThreadId, currentThreadId, true);
IntPtr activeCtrlId = GetFocus();
return GetText(activeCtrlId);
}
catch (Exception exp)
{
return exp.Message;
}
}
//Get the text of the control at the mouse position
private string GetTextFromControlAtMousePosition()
{
try
{
Point p;
if (GetCursorPos(out p))
{
IntPtr ptr = WindowFromPoint(p);
if (ptr != IntPtr.Zero)
{
return GetText(ptr);
}
}
return "";
}
catch (Exception exp)
{
return exp.Message;
}
}
//Get the text of a control with its handle
private string GetText(IntPtr handle)
{
int maxLength = 512;
IntPtr buffer = Marshal.AllocHGlobal((maxLength + 1) * 2);
SendMessageW(handle, WM_GETTEXT, maxLength, buffer);
string w = Marshal.PtrToStringUni(buffer);
Marshal.FreeHGlobal(buffer);
return w;
}
}
}