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我正在 C# 中创建一个小实用程序，当按下全局热键时，它将向活动文本框添加一些文本，这是一种自动完成功能。我有我的全局热键工作，但现在我不知道如何在活动文本框中获取当前文本（如果活动窗口是一个文本框。）到目前为止我尝试的是使用

一个。GetForegroundWindow，然后使用该句柄调用 GetWindowText。这给了我活动窗口的窗口标题，而不是文本框内容。

湾。GetActiveWindow 并使用该句柄调用 GetWindowText。这根本没有给我任何文字。

这是我所做的一个例子

[DllImport("user32.dll")]
private static extern bool UnregisterHotKey(IntPtr hWnd, int id);
[ DllImport("user32.dll") ]
static extern int GetForegroundWindow();
[ DllImport("user32.dll") ]
static extern int GetWindowText(int hWnd, StringBuilder text, int count);   
[DllImport("user32.dll")]
static extern int GetActiveWindow();

public static void TestA() {
    int h = GetForegroundWindow();
    StringBuilder b = new StringBuilder();
    GetWindowText(h, b, 256);
    MessageBox.Show(b.ToString());
}

public static void TestB() {
    int h = GetActiveWindow();
    StringBuilder b = new StringBuilder();
    GetWindowText(h, b, 256);
    MessageBox.Show(b.ToString());
}

那么，关于如何实现这一目标的任何想法？

编辑 28.01.2009： 所以，我发现了如何做到这一点。这是我使用的：

using System;
using System.Text;
using System.Runtime.InteropServices;

public class Example
{
[DllImport("user32.dll")]
static extern int GetFocus();

[DllImport("user32.dll")]
static extern bool AttachThreadInput(uint idAttach, uint idAttachTo, bool fAttach);

[DllImport("kernel32.dll")]
static extern uint GetCurrentThreadId();

[DllImport("user32.dll")]
static extern uint GetWindowThreadProcessId(int hWnd, int ProcessId);    

[DllImport("user32.dll") ]
static extern int GetForegroundWindow();

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]
static extern int SendMessage(int hWnd, int Msg, int wParam, StringBuilder lParam); 

const int WM_SETTEXT = 12;
const int WM_GETTEXT = 13;

public static void Main() 
{
    //Wait 5 seconds to give us a chance to give focus to some edit window,
    //notepad for example
    System.Threading.Thread.Sleep(5000);
    StringBuilder builder = new StringBuilder(500);

    int foregroundWindowHandle = GetForegroundWindow();
    uint remoteThreadId = GetWindowThreadProcessId(foregroundWindowHandle, 0);
    uint currentThreadId = GetCurrentThreadId();

    //AttachTrheadInput is needed so we can get the handle of a focused window in another app
    AttachThreadInput(remoteThreadId, currentThreadId, true);
    //Get the handle of a focused window
    int  focused = GetFocus();
    //Now detach since we got the focused handle
    AttachThreadInput(remoteThreadId, currentThreadId, false);

    //Get the text from the active window into the stringbuilder
    SendMessage(focused, WM_GETTEXT, builder.Capacity, builder);
    Console.WriteLine("Text in active window was " + builder);
    builder.Append(" Extra text");
    //Change the text in the active window
    SendMessage(focused, WM_SETTEXT, 0, builder);
    Console.ReadKey();
    }
}

关于这一点的一些注释。该示例在执行任何操作之前等待 5 秒，让您有机会将焦点放在某个编辑窗口上。在我的真实应用程序中，我使用热键来触发它，但这只会混淆这个例子。此外，在生产代码中，您应该检查 win32 调用的返回值以查看它们是否成功。

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2 回答 2

1

It's reasonable to send keystrokes if you aware of active window and focused input field. See http://www.pinvoke.net/default.aspx/user32/keybd_event.html for API.

于 2009-01-26T12:27:33.607 回答
1

请检查，即使 em_replacesel 消息可能无法在不同的进程中工作，您可能需要使用 WM_COPYDATA 或调用 url 中给出的窗口过程，

http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.smartphone.developer&tid=4e3a9289-9355-4af7-a5b9-84f1aa601441&cat=&lang=&cr=&sloc=en-美国&p=1

于 2009-02-04T12:05:27.197 回答