Delphi 7前瞻：将Delphi作为ASP.NET的脚本语言(上)

将Delphi视为脚本语言

支持ASP.NET的第一件事是让ASP.NET将Delphi视为脚本语言，让ASP.NET能够为各种ASP文件类型调用Delphi的.NET编译器。

ASP.NET要在IIS虚路径的根目录下寻找web.config文件。下面是ASP.NET中使用Delphi作脚本语言的web.config配制文件内容：

 1<configuration>
 2<system.web>
 3<compilation debug="true">
 4<assemblies>
 5<add assembly="DelphiProvider"></add>
 6</assemblies>
 7<compilers>
 8<compiler extension=".pas" language="Delphi" type="Borland.Delphi.DelphiCodeProvider,DelphiProvider"></compiler>
 9</compilers>
10</compilation>
11</system.web>
12</configuration>

关于web配制文件的详情请参MSDN：
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconformatofconfigurationfiles.asp

在我的机器(Win2K Pro)上测试Delphi对ASP.NET的支持。要增加一个虚路径来安放Delphi脚本，我把这个路径名定为"vslive"。

在我的机器配制文件上作了这个小改动后就可以来看ASP.NET是如何将Delphi视为脚本语言的。

在ASP.NET中使用Delphi代码
首先编写一个简单应用来确认我们的Delphi支持配制是正确的。下面是editdemo.aspx文件的代码，有一个文本输入框，一个按钮。按钮事件触发显示输入框内容。

 1<html>
 2<script language="Delphi" runat="server">   
 3procedure ButtonClick(Sender: System.Object; E: EventArgs);   
 4begin   
 5Message.Text := Edit1.Text;   
 6end;   
 7</script>
 8<body>
 9<form runat="server">
10<asp:textbox id="Edit1" runat="server"></asp:textbox>
11<asp:button onclick="ButtonClick" runat="server" text="Click Me!"></asp:button>
12</form>
13<p><b><asp:label id="Message" runat="server"></asp:label></b></p>
14</body>
15</html>

可以看到，ASP按钮对象的OnClick事件触发Delphi的ButtonClick过程，而Delphi程序里却使用了ASP对象label Message和text box Edit1。虽然在Delphi过程中没有定义ASP的二个变量，Delphi代码却能找到它们。这是因为脚本中含有的Delphi服务模块能够产生相应的Delphi代码。

现在可以用本地浏览器来浏览这个网页了。因为我把脚本放在"vslive"虚路径，所以打开：
http://localhost/vslive/editdemo.aspx .

以下是编译之后形成的Delphi代码，代码产生WebForm：

//------------------------------------------------------------------------------
//

1<autogenerated>   
2// 本代码由一个工具生成   
3// 运行版本：1.0.3705.209   
4//   
5// 修改本文件将导致异常行为并丢失生成的代码。   
6// </autogenerated>

//------------------------------------------------------------------------------

unit ASP;

interface

uses System.Collections, System.Collections.Specialized, System.Configuration,
System.Text, System.Text.RegularExpressions, System.Web, System.Web.Caching,
System.Web.SessionState, System.Web.Security, System.Web.UI, System.Web.UI.WebControls,
System.Web.UI.HtmlControls, System.Globalization;

var
editdemo_aspx___autoHandlers: Integer;
editdemo_aspx___intialized: Boolean = False;
editdemo_aspx___fileDependencies: System.Collections.ArrayList;
type
editdemo_aspx = class(System.Web.UI.Page, System.Web.SessionState.IRequiresSessionState)
protected
Edit1: System.Web.UI.WebControls.TextBox;
__control3: System.Web.UI.WebControls.Button;
__control2: System.Web.UI.HtmlControls.HtmlForm;
Message: System.Web.UI.WebControls.Label;
procedure ButtonClick(Sender: System.Object; E: EventArgs);
public
constructor Create;
function get_AutoHandlers: Integer; override;
function get_ApplicationInstance: System.Web.HttpApplication; virtual;
function get_TemplateSourceDirectory: System.String; override;
procedure set_AutoHandlers(Value: Integer); override;
protected
property AutoHandlers: Integer read get_AutoHandlers write set_AutoHandlers;
property ApplicationInstance: System.Web.HttpApplication read get_ApplicationInstance;
public
property TemplateSourceDirectory: System.String read get_TemplateSourceDirectory;
private
function __BuildControlEdit1: System.Web.UI.Control;
function __BuildControl__control3: System.Web.UI.Control;
function __BuildControl__control2: System.Web.UI.Control;
function __BuildControlMessage: System.Web.UI.Control;
procedure __BuildControlTree(__ctrl: System.Web.UI.Control);
protected
procedure FrameworkInitialize; override;
public
function GetTypeHashCode: Integer; override;
end;

implementation

procedure editdemo_aspx.ButtonClick(Sender: System.Object; E: EventArgs);
begin
Message.Text := Edit1.Text;
end;
constructor editdemo_aspx.Create;
var
dependencies: System.Collections.ArrayList;
begin
inherited Create;

if (ASP.editdemo_aspx___intialized = False) then
begin
dependencies := System.Collections.ArrayList.Create;
dependencies.Add('d:\vslive\editdemo.aspx');
ASP.editdemo_aspx___fileDependencies := dependencies;
ASP.editdemo_aspx___intialized := True;
end;
Self.Server.ScriptTimeout := 30000000;
end;

function editdemo_aspx.get_AutoHandlers: Integer;
begin
Result := ASP.editdemo_aspx___autoHandlers;
end;

function editdemo_aspx.get_ApplicationInstance: System.Web.HttpApplication;
begin
Result := Self.Context.ApplicationInstance as System.Web.HttpApplication;
end;

function editdemo_aspx.get_TemplateSourceDirectory: System.String;
begin
Result := '/vslive';
end;

procedure editdemo_aspx.set_AutoHandlers(Value: Integer);
begin
ASP.editdemo_aspx___autoHandlers := Value;
end;

function editdemo_aspx.__BuildControlEdit1: System.Web.UI.Control;
var
__ctrl: System.Web.UI.WebControls.TextBox;
begin

__ctrl := System.Web.UI.WebControls.TextBox.Create;
Self.Edit1 := __ctrl;
__ctrl.ID := 'Edit1';
__ctrl.Width := System.Web.UI.WebControls.Unit.Parse('300px', System.Globalization.CultureInfo.InvariantCulture);
Result := __ctrl;
end;

function editdemo_aspx.__BuildControl__control3: System.Web.UI.Control;
var
__ctrl: System.Web.UI.WebControls.Button;
begin

__ctrl := System.Web.UI.WebControls.Button.Create;
Self.__control3 := __ctrl;
__ctrl.Text := 'Click Me!';
__ctrl.add_Click(Self.ButtonClick);
Result := __ctrl;
end;

function editdemo_aspx.__BuildControl__control2: System.Web.UI.Control;
var
__parser: System.Web.UI.IParserAccessor;
__ctrl: System.Web.UI.HtmlControls.HtmlForm;
begin

__ctrl := System.Web.UI.HtmlControls.HtmlForm.Create;
Self.__control2 := __ctrl;
__parser := __ctrl as System.Web.UI.IParserAccessor;
__parser.AddParsedSubObject(System.Web.UI.LiteralControl.Create(''#13#10' '));
Self.__BuildControlEdit1;
__parser.AddParsedSubObject(Self.Edit1);
__parser.AddParsedSubObject(System.Web.UI.LiteralControl.Create(''#13#10' '));
Self.__BuildControl__control3;
__parser.AddParsedSubObject(Self.__control3);
__parser.AddParsedSubObject(System.Web.UI.LiteralControl.Create(''#13#10' '));
Result := __ctrl;
end;

function editdemo_aspx.__BuildControlMessage: System.Web.UI.Control;
var
__ctrl: System.Web.UI.WebControls.Label;
begin

__ctrl := System.Web.UI.WebControls.Label.Create;
Self.Message := __ctrl;
__ctrl.ID := 'Message';
Result := __ctrl;
end;

procedure editdemo_aspx.__BuildControlTree(__ctrl: System.Web.UI.Control);
var
__parser: System.Web.UI.IParserAccessor;
begin
__parser := __ctrl as System.Web.UI.IParserAccessor;
__parser.AddParsedSubObject(System.Web.UI.LiteralControl.Create('

1<html>'#13#10' '));   
2__parser.AddParsedSubObject(System.Web.UI.LiteralControl.Create(''#13#10' <body>'#13#10' '));   
3Self.__BuildControl__control2;   
4__parser.AddParsedSubObject(Self.__control2);   
5__parser.AddParsedSubObject(System.Web.UI.LiteralControl.Create(''#13#10' <p><b>'));   
6Self.__BuildControlMessage;   
7__parser.AddParsedSubObject(Self.Message);   
8__parser.AddParsedSubObject(System.Web.UI.LiteralControl.Create('</b></p>'#13#10' </body>'#13#10'</html>

'#13#10));
end;

procedure editdemo_aspx.FrameworkInitialize;
begin
Self.__BuildControlTree(Self);
Self.FileDependencies := ASP.editdemo_aspx___fileDependencies;
Self.EnableViewStateMac := True;
end;

function editdemo_aspx.GetTypeHashCode: Integer;
begin
Result := -764444463;
end;

end.

注意：这里介绍的是Delphi的.NET编译器功能的预览。正式发布的Delphi 7生成的代码与上面将有显著不同。本文仅是示例说明如何在ASP.NET中使用Delphi及其功能。

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