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cellspacing="1" cellpadding="1" bgcolor="#000000"><tr bgcolor="#FFFFFF"><td width="100%" colspan="4" align="left"><table width="95%" align="center"><tr><td class="font1"><p align="center"><br><font size="3">不明就里? </font><br><span class="nava"><font color="#CC9933">2000-08-30· 吴中卫·yesky</font></span></p><p> 在Delphi 3的时代，我们是没法让TMemo突破传统的64K界限的。现在可就轻松多了。出于方便、快捷和安全性的考虑(在文本模式下是不会有富裕(Rich)控制标识), TMemo制作的文本转换、文本阅读器是比较不错的好帮手，至少在编程上来得较为省时。唯一美中不足的是在这种状态下，难以确定行号和列号，而这些在阅读、打字时是比较常用的。</p><p> 如果读者的编译器为10.0版以下，可以这样解决：</p><p> 对TMemo的句柄发送EM_LINEFROMCHAR来获得当前字符的行数，进行一下Interger <-> String的变换就是行号了，而获得当前光标所在的列数就稍微复杂一点：</p><p> 先对TMemo的句柄发送EM_GETSEL来获得当前光标对于所在字符的选择数(该返回值是一个DWORD,低位WORD为选择起始值，高位WORD为选择数)，这个数包含了从TMemo文本缓冲开始以来的字符，因此，必须减去当前行以前的所有字符的另外一个数，这另外一个数可以对TMemo的句柄发送EM_LINEINDEX来获得。</p><p> 也就是：</p><p> 行数= SendMessage(Handle, EM_LINEFROMCHAR, -1, 0);</p><p> 列数= LongRec(SendMessage(Handle, EM_GETSEL, 0, 0)).Hi -</p><p> SendMessage(Handle, EM_LINEINDEX, -1, 0);</p><p> 如果你正在使用Delphi 5，那么这一切都在TMemo.CaretPos的TPoint这个属性里，其X正是列值，而Y为行值。</p><p> 为了正常显示行列号，建议读者使用消息来处理。这是为了正确处理用户在打字时按下诸如: Home、End之类的键。</p><p> 一个范例：</p><p> unit Unit1;</p><p> interface</p><p> uses</p><p> Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,</p><p> ComCtrls, StdCtrls;</p><p> const</p><p> WM_USERGETPOS = WM_USER + 100; //定义绘出行列号的消息</p><p> type</p><p> TForm1 = class(TForm)</p><p> Memo1: TMemo;</p><p> StatusBar1: TStatusBar;</p><p> procedure FormCreate(Sender: TObject);</p><p> procedure Memo1KeyDown(Sender: TObject; var Key: Word;</p><p> Shift: TShiftState);</p><p> procedure Memo1MouseUp(Sender: TObject; Button: TMouseButton;</p><p> Shift: TShiftState; X, Y: Integer);</p><p> private</p><p> { Private declarations }</p><p> protected</p><p> { protected declarations }</p><p> procedure DrawMyPos(var Msg: TMessage);message WM_USERGETPOS; //消息事件</p>⌨️ 快捷键说明
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