Delphi SuperDll

作为一名5年的Delpher，一直认为Delphi是桌面应用的王者，我相信其他的Delpher也这么认为。

但是，慢慢的我发现普通方式的Delphi开发会造成代码的严重臃肿，特别是MDI类大型项目、多人同时开发的情况下。

举个例子，一个Delphi常用的业务逻辑，数据导出到Excel，完全可以写成一个公用的模块放置在业务单元，子窗体用到时直接调用即可，但是一般情况下，事情并不止想象的那么简单，维护人员的思想真的一言难尽。

后来，我有了将Delphi中常用的业务逻辑功能封装成DLL的想法，所有的业务逻辑只能在DLL中实现，系统中不允许直接写业务逻辑，只能调用DLL。

这么做的好处是，相同的业务功能不会被重复开发，大大减少了代码的臃肿，同时，业务逻辑开发人员和前台开发人员独立开来，提高了开发效率。

这里就是SuperDLL的由来，后续将持续更新。

请看如下代码：

更新日志：

//初始化

//邮件发送

//FTP上传、下载

//cxGrid数据导出

library SuperDll;

{ Important note about DLL memory management: ShareMem must be the
  first unit in your library's USES clause AND your project's (select
  Project-View Source) USES clause if your DLL exports any procedures or
  functions that pass strings as parameters or function results. This
  applies to all strings passed to and from your DLL--even those that
  are nested in records and classes. ShareMem is the interface unit to
  the BORLNDMM.DLL shared memory manager, which must be deployed along
  with your DLL. To avoid using BORLNDMM.DLL, pass string information
  using PChar or ShortString parameters. }

uses
  SysUtils, Classes, Variants, Graphics, Controls, IdBaseComponent, IdComponent, IdFTP,
  IdFTPCommon, IdTCPConnection, IdTCPClient, IdMessage, IdMessageClient, IdSMTP, cxGrid,
  cxGridExportLink, ComObj,
  cxCustomData, cxGraphics,
  cxData, cxDataStorage, cxEdit, cxDBData, cxGridLevel,
  cxClasses, cxControls, cxGridCustomView, cxGridCustomTableView,
  cxGridTableView, cxGridDBTableView;

{$R *.res}

function SuperDll_Init: Boolean; stdcall;
begin
  Result := True;
end;

function SuperDll_Ftp_PutOrGet(vType: string; var vUserName: string; var vPassWord: string; var vHost: string; var vDir: string; var vDesFilePath: string; vSouFilePath: string): Boolean; stdcall; //2: FTP文件上传下载
var
  IdFtp: TIdFTP;
begin
  IdFtp := TIdFTP.Create(nil);
  Result := False;
  try
    with IdFtp do
    begin
      if Connected then Disconnect;
      Username := vUserName;
      Password := vPassWord;
      Host := vHost;
      Port := 21;
      Connect;
      ChangeDir(vDir);
      TransferType := ftBinary;
      if vType = 'Put' then
      begin
        Put(vSouFilePath, ExtractFileName(vSouFilePath));
      end
      else if vType = 'Get' then
      begin
        Get(ExtractFileName(vDesFilePath), vDesFilePath, True);
      end;
    end;
  finally
    IdFtp.Disconnect;
    IdFtp.Free;
    Result := True;
  end;
end;

function SuperDll_EMail_Send(vSubject: string; var vFrom: string; var vRecipients: string; var vCCList: string; var vBccList: string; var vBody: string; var vAttachment: string; var vUsername: string; var vPassword: string; var vHost: string): Boolean; stdcall;
var
  IdSMTP: TIdSMTP;
  IdMessage: TIdMessage;
begin
  Result := False;
  IdSMTP := TIdSMTP.Create(nil);
  IdMessage := TIdMessage.Create(nil);
  try
    with IdMessage do
    begin
      Clear;
      Subject := vSubject;
      From.Text := vFrom;
      Recipients.EMailAddresses := vRecipients;
      CCList.EMailAddresses := vCCList;
      BccList.EMailAddresses := vBccList;
      Priority := TIdMessagePriority(4);
      if Trim(vAttachment) <> '' then
      begin
        TIdAttachment.Create(MessageParts, Trim(vAttachment));
      end;
      vBody := vBody + #13#10;
      vBody := vBod