写文本记事本用C＃/的Win32 [英] Write text to notepad with C#/Win32

问题描述

我的Win32 API和Windows消息试图找出是如何工作的乱搞，我发现这个的的问题非常有帮助。

我想在那里提供的解决方案来改善，使其追加文本，而不是通过WM_SETTEXT在记事本刚替换文本。

我的问题是，我怎么会用WM_GETTEXTLENGHT，其次是WM_GETTEXT，以获得在记事本窗口的当前文本所以我可以然后使用WM_SETTEXT之前追加新的文本呢？

使用是否在32位和64位的机器WM_XXXTEXT工作？如果在记事本中大量的文本将建议的get / set算法仍然可以工作，否则会养猪的大量资源？如果是这样，有另一种方式将文本追加到记事本窗口而不先在其复制的一切？

感谢您的帮助！

更新：

下面是我想出了根据大卫·赫弗南的帮助和谷歌/ SO削减ñ粘贴代码。由于我是新来的Win32API的复制和来自不同来源的多条线路我会很感激的任何和所有的反馈。

 函数[DllImport （User32.dll中，字符集= CharSet.Auto）] 
的extern静态的IntPtr FindWindowEx（IntPtr的hwndParent，IntPtr的hwndChildAfter，[IN]串lpClassName，[在]串lpWindowName）; 
 
函数[DllImport（User32.dll中，入口点=SendMessage函数）] 
的extern静态INT SendMessageGetTextLength（IntPtr的的HWND，INT味精，IntPtr的的wParam，lParam的IntPtr的）; 
 
函数[DllImport（User32.dll中）] 
公共静态外部INT SendMessage函数（IntPtr的的HWND，INT uMsg，诠释的wParam，lParam的字符串） 
 
函数[DllImport（User32.dll中）] 
公共静态外部INT SendMessage函数（IntPtr的的HWND，INT uMsg，诠释的wParam，lParam的INT）; 
 
 const int的WM_GETTEXTLENGTH = 0x000E; 
 
 const int的EM_SETSEL = 0x00B1; 
 
 const int的EM_REPLACESEL = 0x00C2; 
 
公共无效testAppendText（字符串文本）
 {
过程[] =记事本Process.GetProcessesByName（记事本）; 
如果（notepads.Length == 0）回报; 
如果（记事本[0]！= NULL）
 {
 IntPtr的编辑框= FindWindowEx（记事本[0] .MainWindowHandle，新的IntPtr（0），编辑，NULL）; 
 INT长度= SendMessageGetTextLength（编辑框，WM_GETTEXTLENGTH，IntPtr.Zero，IntPtr.Zero）; 
 SendMessage函数（编辑框，EM_SETSEL，长度，长度）; 
 SendMessage函数（编辑框，EM_REPLACESEL，1，文本）; 
} 
 
} 
  

解决方案

发送 EM_SETSEL 来把插入符编辑窗口的结束。然后发送 EM_REPLACESEL 追加文本。

这是比读的全部内容，附加你的另外再要好得多设置的全部内容，如果编辑控件包含大量的文字。

这些方法可以跨32/64位进程边界没有困难。

I'm messing around with Win32 API and windows messaging trying to figure out how things work and I found this question very helpful.

I'd like to improve upon the solution provided there so that it appends the text instead of just replacing the text in notepad via WM_SETTEXT.

My question is, how would I use WM_GETTEXTLENGHT, followed by WM_GETTEXT, to get the current text in the notepad window so I could then append new text to it before using WM_SETTEXT?

Does using WM_XXXTEXT work on both 32 and 64-bit machines? If there is a lot of text in notepad would the proposed get/set algorithm still work or would it hog a bunch of resources? If so, is there another way to append text to the notepad window without copying everything in it first?

Thanks for you help!!

UPDATE:

Here is the code I came up with based on David Heffernan's help and Google/SO cut n pasting. As I'm new to the Win32API and copied many lines from different sources I'd appreciate any and all feedback.

[DllImport("User32.dll", CharSet = CharSet.Auto)]
        extern static IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, [In] string lpClassName, [In] string lpWindowName);

        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        extern static int SendMessageGetTextLength(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);

        [DllImport("User32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int uMsg, int wParam, string lParam);

        [DllImport("User32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int uMsg, int wParam, int lParam);

        const int WM_GETTEXTLENGTH = 0x000E;

        const int EM_SETSEL = 0x00B1;

        const int EM_REPLACESEL = 0x00C2;

        public void testAppendText(string text)
        {
            Process[] notepads = Process.GetProcessesByName("notepad");
            if (notepads.Length == 0) return;
            if (notepads[0] != null)
            {
                IntPtr editBox = FindWindowEx(notepads[0].MainWindowHandle, new IntPtr(0), "Edit", null);
                int length = SendMessageGetTextLength(editBox, WM_GETTEXTLENGTH, IntPtr.Zero, IntPtr.Zero);
                SendMessage(editBox, EM_SETSEL, length, length);
                SendMessage(editBox, EM_REPLACESEL, 1, text);
            }

        } 

解决方案

Send EM_SETSEL to put the caret to the end of the edit window. Then send EM_REPLACESEL to append text.

This is much better than reading the entire contents, appending your addition and then setting the entire contents if the edit control contains a large amount of text.

These methods can cross 32/64 bit process boundaries without difficulty.

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