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📄 c++ builder 程序设计实用教程 - 3_1_1 对话框函数简介 - 张晋 - 17xie.htm

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123 
style="FONT-FAMILY: 'Times New Roman'">="</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">欢迎来到</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'">C++ Builder</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">世界</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'">,</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在这里将向您介绍</SPAN><SPAN 
class=SpellE><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">showmessage</SPAN></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">函数的基本用法</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'">";<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">//</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为字符串变量赋值</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=a0><SPAN class=SpellE><SPAN class=GramE><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">ShowMessage</SPAN></SPAN></SPAN><SPAN 
class=GramE><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">(</SPAN></SPAN><SPAN class=SpellE><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'">str</SPAN></SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'">);<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">//</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">显示对话框</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">}<o:p></o:p></SPAN></P>
<H4><SPAN lang=EN-US>4</SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．运行程序</SPAN></H4>
<P class=MsoNormal><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">完成以上的工作后，选择菜单“</SPAN><SPAN 
lang=EN-US>File</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">”中的“</SPAN><SPAN 
lang=EN-US>Save All</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">”选项，在弹出的窗口中选择一个合适的文件名存储文件，然后按键盘上的功能键</SPAN><SPAN 
lang=EN-US>F9</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">运行程序。</SPAN></P>
<P class=MsoNormal><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在程序的运行过程中，用鼠标的左键单击窗体中按钮“</SPAN><SPAN 
lang=EN-US>Hello</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">”，在窗体上就会弹出一个对话框，如图</SPAN><SPAN 
lang=EN-US>3-1</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示。</SPAN></P>
<P class=a><SPAN lang=EN-US><IMG height=220 
src="C++ Builder 程序设计实用教程 - 3_1_1 对话框函数简介 - 张晋 - 17xie.files/54053790b5.jpg" 
width=310 v:shapes="_x0000_i1025"></SPAN></P>
<P class=MsoCaption><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图</SPAN><SPAN 
lang=EN-US>3-1<SPAN style="mso-spacerun: yes">&nbsp; </SPAN><SPAN 
class=SpellE>ShowMessage</SPAN>()</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">函数输出对话框</SPAN></P>
<H4><SPAN lang=EN-US>5</SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．</SPAN><SPAN 
class=SpellE><SPAN lang=EN-US>MessageDlg</SPAN></SPAN><SPAN 
lang=EN-US>()</SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">函数</SPAN></H4>
<P class=MsoNormal><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对话框函数中的</SPAN><SPAN 
class=SpellE><SPAN lang=EN-US>MessageDlg</SPAN></SPAN><SPAN 
lang=EN-US>()</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">函数用于在程序运行的过程中显示一个包含一个字符串、位图和按钮信息的对话框，用户只有对这个对话框进行正确的响应之后，才能够关闭对话框，进行下一步的工作。</SPAN></P>
<P class=MsoNormal><SPAN class=SpellE><SPAN 
lang=EN-US>MessageDlg</SPAN></SPAN><SPAN lang=EN-US>()</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">函数的语法结构如下所示：</SPAN></P>
<P class=a0><SPAN class=GramE><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">function</SPAN></SPAN><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'"> <SPAN 
class=SpellE>MessageDlg</SPAN>(const <SPAN class=SpellE>Msg</SPAN>: string; 
<SPAN class=SpellE>AType</SPAN>: <SPAN class=SpellE>TMsgDlgType;AButtons</SPAN>: 
<SPAN class=SpellE>TMsgDlgButtons</SPAN>; <SPAN class=SpellE>HelpCtx</SPAN>: 
<SPAN class=SpellE>Longint</SPAN>): Word;<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">下面的示例程序就是用于在程序运行中产生一个对话框，在其中显示一个字符串，具体的步骤如下所示：</SPAN></P>
<H4><SPAN lang=EN-US>6</SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．开始工作</SPAN></H4>
<P class=MsoNormal><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">首先其中一个新的项目，在屏幕上就会弹出一个空白的窗体，向窗体上添加一个按钮控件，控件的标题设置为“</SPAN><SPAN 
lang=EN-US>Welcome</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">”。</SPAN></P>
<H4><SPAN lang=EN-US>7</SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．添加代码</SPAN></H4>
<P class=MsoNormal><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在程序的设计过程中用鼠标的左键双击窗体上的按钮控件，在屏幕上就会弹出一个代码窗口，在其中添加如下所示的按钮响应代码：</SPAN></P>
<P class=a0><SPAN class=GramE><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">char</SPAN></SPAN><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'"> *string;<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">//</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">定义字符串变量</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'"><o:p>&nbsp;</o:p></SPAN></P>
<P class=a0><SPAN class=GramE><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">void</SPAN></SPAN><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'"> __<SPAN class=SpellE>fastcall</SPAN> 
TForm1::Button1Click(<SPAN class=SpellE>TObject</SPAN> 
*Sender)<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">{<o:p></o:p></SPAN></P>
<P class=a0><SPAN class=SpellE><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">str</SPAN></SPAN><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">="</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">欢迎来到</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'">C++ Builder</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">世界</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'">,</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在这里将向您介绍</SPAN><SPAN 
class=SpellE><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">showmessage</SPAN></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">函数的基本用法</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'">";<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">//</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为字符串变量赋值</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=a0><SPAN class=SpellE><SPAN class=GramE><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">MessageDlg</SPAN></SPAN></SPAN><SPAN 
class=GramE><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">(</SPAN></SPAN><SPAN class=SpellE><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'">str</SPAN></SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'">, <SPAN 
class=SpellE>mtConfirmation</SPAN>, <SPAN 
class=SpellE>TMsgDlgButtons</SPAN>()&lt;&lt;<SPAN 
class=SpellE>mbYes</SPAN>&lt;&lt;mbNo,0);<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">//</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">显示对话框</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">}<o:p></o:p></SPAN></P>
<H4><SPAN lang=EN-US>8</SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．运行程序</SPAN></H4>
<P class=MsoNormal><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在程序的运行过程中，用鼠标的左键单击窗体中按钮“</SPAN><SPAN 
lang=EN-US>Welcome</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">”，在窗体上就会弹出一个对话框，如图</SPAN><SPAN 
lang=EN-US>3-2</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示。</SPAN></P>
<P class=a><SPAN lang=EN-US><IMG height=217 
src="C++ Builder 程序设计实用教程 - 3_1_1 对话框函数简介 - 张晋 - 17xie.files/628e545429.jpg" 
width=323 v:shapes="_x0000_i1026"></SPAN></P>
<P class=MsoCaption><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图</SPAN><SPAN 
lang=EN-US>3-2<SPAN style="mso-spacerun: yes">&nbsp; </SPAN><SPAN 
class=SpellE>MessageDlg</SPAN>()</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">函数输出对话框</SPAN></P>
<H4><SPAN lang=EN-US>9</SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．</SPAN><SPAN 
class=SpellE><SPAN lang=EN-US>InputBox</SPAN></SPAN><SPAN 
lang=EN-US>()</SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">函数</SPAN></H4>
<P class=MsoNormal><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对话框函数中的</SPAN><SPAN 
class=SpellE><SPAN lang=EN-US>InputBox</SPAN></SPAN><SPAN 
lang=EN-US>()</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">函数用于在程序运行的过程中显示一个包含一个字符串和按钮信息的输入对话框，用户只有对这个对话框进行正确的响应之后，才能够关闭对话框，进行下一步的工作。</SPAN></P>
<P class=MsoNormal><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">它的语法结构如下所示：</SPAN></P>
<P class=a0><SPAN class=GramE><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'">function</SPAN></SPAN><SPAN lang=EN-US 
style="FONT-FAMILY: 'Times New Roman'"> <SPAN class=SpellE>InputBox</SPAN>(const 
<SPAN class=SpellE>ACaption</SPAN>, <SPAN class=SpellE>APrompt</SPAN>, <SPAN 
class=SpellE>ADefault</SPAN>: string): string;<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">下面以一个示例来说明</SPAN><SPAN 
class=SpellE><SPAN lang=EN-US>InputBox</SPAN></SPAN><SPAN 
lang=EN-US>()</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">函数的用法，具体的设计步骤如下：</SPAN></P>
<H4><SPAN lang=EN-US>10</SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．开始工作</SPAN></H4>
<P class=MsoNormal><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在程序的设计阶段，向空白的窗体上放置一个按钮控件、一个标签和一个输入文本框，如图</SPAN><SPAN 
lang=EN-US>3-3</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示。</SPAN></P>
<P class=a><SPAN lang=EN-US><IMG height=99 
src="C++ Builder 程序设计实用教程 - 3_1_1 对话框函数简介 - 张晋 - 17xie.files/1c82de5a46.jpg" 
width=232 v:shapes="_x0000_i1027"></SPAN></P>
<P class=MsoCaption><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图</SPAN><SPAN 
lang=EN-US>3-3<SPAN style="mso-spacerun: yes">&nbsp; </SPAN></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">输入对话框</SPAN></P>
<P class=MsoNormal><SPAN
123

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