接发E-mail是许多“网虫”必修的功课,E-mail工具软件也很多,国外
的有Microsoft的OutlookExpress、TheBat等,国内则有FoxMail这样的精品。
其实,利用可视化编程工具Delphi4.0也能够制作出自己的E-mail软件。
Delphi4.0有关E-mail的组件有两个:NmPOP3和NmSTMP,它们都位于Internet
选项卡上,其中,NmPOP3组件封装并实现POP3协议,用来从InternetPOP3服务
器上读取电子邮件;NmSTMP封装并实现STMP协议,可用来向Internet的STMP服
务器发送电子邮件。限于篇幅,我们不能两者都介绍,这里只用NmSTMP编写一
个发送E-mail的程序,至于NmPOP3,以后有机会再谈,或者在看完本文后你有
兴趣,也可以借助于Delphi的帮助文档尝试用NmPOP3编程。
我们先来看一下程序运行界面。图1是程序主窗体,上面有一个字符串网格
(StringGrid)和三个按钮,它们的容器是仅有一个标签的PageControl。单击
“Clear”钮清除网格内容,单击“Send”钮发送E-mail,单击“NewMail”
钮弹出图2所示的对话框,此对话框用来设置STMP服务器名称、发件人地址、收
件人地址、发件人名称和邮件主题,其中前三项必须填写,“SelectFile”按
钮用来打开Open对话框,以便选取要发送的附件。
NmSTMP的属性和方法不多,关键的属性是Host(STMP服务器名称)和PostMessage
(包含邮件信息),正确设置了Host属性和PostMessage属性后,就可以用Connect
方法(连接服务器)和SendMail方法发送E-mail了。
编写代码之前先要改变StringGrid1的一些缺省属性:ColCount属性为6,
FixedCols属性为0,RowCount属性为2,另外,将PageControl1的Align属性置
为alClient。
以下是Unit1(主窗体)代码清单:
unitUnit1;
interface
uses
Windows,Messages,SysUtils,Classes,Graphics,Controls,Forms,
Dialogs,Grids,ComCtrls,StdCtrls,Psock,NMsmtp;
type
TForm1=class(TForm)
PageControl1:TPageControl;
TabSheet1:TTabSheet;
StatusBar1:TStatusBar;
StringGrid1:TStringGrid;
Button1:TButton;
Button2:TButton;
Button3:TButton;
NMSMTP1:TNMSMTP;
procedureFormCreate(Sender:TObject);
procedureButton1Click(Sender:TObject);
procedureButton2Click(Sender:TObject);
procedureButton3Click(Sender:TObject);
procedureNMSMTP1Failure(Sender:TObject);
procedureNMSMTP1SendStart(Sender:TObject);
procedureNMSMTP1Success(Sender:TObject);
private
{Privatedeclarations}
public
{Publicdeclarations}
end;
var
Form1:TForm1;
implementation
usesUnit2;
{$R*.DFM}
procedureTForm1.FormCreate(Sender:TObject);
begin
PageControl1.Pages[0].Caption:=‘SendMail’;
self.Caption:=‘MyMailer’;
self.BorderIcons:=[biSystemMenu,biMinimize];
self.BorderStyle:=bsSingle;
Application.Icon:=self.Icon;
Application.Title:=self.Caption;
withStringGrid1do
begin
Cells[0,0]:=‘Host’;
Cells[1,0]:=‘ToAddress’;
Cells[2,0]:=‘FromAddress’;
Cells[3,0]:=‘YourName’;
Cells[4,0]:=‘Subject’;
Cells[5,0]:=‘File’;
end;
Button2.Enabled:=False;
Button3.Enabled:=False;
end;
procedureTForm1.Button1Click(Sender:TObject);
begin
Form2.Show;
end;
procedureTForm1.Button2Click(Sender:TObject);
var
i:Integer;
begin
fori:=1toStringGrid1.RowCount-2do
withNmsmtp1do
begin
Host:=StringGrid1.Cells[0,i];
PostMessage.ToAddress.Add(StringGrid1.Cells[1,i]);
PostMessage.FromAddress:=StringGrid1.Cells[2,i];
PostMessage.FromName:=StringGrid1.Cells[3,i];
PostMessage.Subject:=StringGrid1.Cells[4,i];
PostMessage.Attachments.Add(StringGrid1.Cells[5,i]);
Connect;
Sendmail;
DisConnect;
end;
Button2.Enabled:=False;
Button3.Click;
end;
procedureTForm1.Button3Click(Sender:TObject);
var
i:Integer;
begin
withStringGrid1do
begin
fori:=1toRowCount-2do
begin
Cells[0,i]:=‘’;
Cells[1,i]:=‘’;
Cells[2,i]:=‘’;
Cells[3,i]:=‘’;
Cells[4,i]:=‘’;
Cells[5,i]:=‘’;
end;
RowCount:=2;
end;
Button2.Enabled:=False;
Button3.Enabled:=False;
end;
procedureTForm1.NMSMTP1Failure(Sender:TObject);
begin
StatusBar1.SimpleText:=‘Mailsendfailure!’;
end;
procedureTForm1.NMSMTP1SendStart(Sender:TObject);
begin
StatusBar1.SimpleText:=‘NowSending...’;
end;
procedureTForm1.NMSMTP1Success(Sender:TObject);
begin
StatusBar1.SimpleText:=‘SendSuccess!’;
end;
end.
Button1是“NewMail”按钮,Button2是“Send”按钮,Button3是“Clear”按钮。
以下是Unit2代码清单:
unitUnit2;
interface
uses
Windows,Messages,SysUtils,Classes,Graphics,Controls,Forms,
Dialogs,StdCtrls;
type
TForm2=class(TForm)
OpenDialog1:TOpenDialog;
GroupBox1:TGroupBox;
GroupBox2:TGroupBox;
Edit1:TEdit;
Edit2:TEdit;
Edit3:TEdit;
Edit4:TEdit;
Edit5:TEdit;
Button1:TButton;
Button2:TButton;
Button3:TButton;
Label1:TLabel;
Label2:TLabel;
Label3:TLabel;
Label4:TLabel;
Label5:TLabel;
Label6:TLabel;
procedureButton1Click(Sender:TObject);
procedureButton2Click(Sender:TObject);
procedureButton3Click(Sender:TObject);
procedureFormActivate(Sender:TObject);
procedureFormCreate(Sender:TObject);
private
{Privatedeclarations}
public
{Publicdeclarations}
end;
var
Form2:TForm2;
implementation
usesUnit1;
{$R*.DFM}
procedureTForm2.FormCreate(Sender:TObject);
begin
self.Caption:=‘NewMail’;
self.BorderStyle:=bsDialog;
end;
procedureTForm2.FormActivate(Sender:TObject);
begin
Edit1.Text:=‘’;
Edit2.Text:=‘’;
Edit3.Text:=‘’;
Edit4.Text:=‘’;
Edit5.Text:=‘’;
Label1.Caption:=‘NoFile’;
end;
procedureTForm2.Button1Click(Sender:TObject);
begin
ifOpenDialog1.Executethen
Label1.Caption:=Opendialog1.Filename;
end;
procedureTForm2.Button2Click(Sender:TObject);
var
i:Integer;
begin
if(Edit1.Text<>‘’)and(Edit2.Text<>‘’)and(Edit5.Text<>‘’)
and(Label1.Caption<>‘NoFile’)then
begin
withForm1.StringGrid1do
begin
RowCount:=RowCount+1;
i:=RowCount-2;
Cells[0,i]:=Edit1.Text;
Cells[1,i]:=Edit2.Text;
Cells[2,i]:=Edit5.Text;
Cells[3,i]:=Edit3.Text;
Cells[4,i]:=Edit4.Text;
Cells[5,i]:=Label1.Caption;
end;
Form1.Button2.Enabled:=True;
Form1.Button3.Enabled:=True;
end;
self.Hide;
end;
procedureTForm2.Button3Click(Sender:TObject);
begin
self.Hide;
end;
end.
Edit1、Edit2、Edit3、Edit4、Edit5编辑框分别用于填写服务器名称、收件
人地址、发件人名称、邮件主题和发件人地址。
现在一个E-mail发送程序就完成了。你可以试一试,自已给自已发几封邮件,
用FoxMail之类的软件是否能收到信。顺便说一句,本文就是用这个自编程序发到
编辑部的。