导出到记事本(打开直接显示文本而不是乱码的写法)

本例子导出效果图:

dbgrideh导出记事本效果图:

 

实例代码:

 

方法1:独立事件单独写法

procedure TForm3.N34Click(Sender: TObject);
var
AList:TStringList;
SaveDialog:TSaveDialog;
AStr,ATitle,AFieldName,AFieldValue:string;
i:Integer;
begin
 SaveDialog:=TSaveDialog.Create(nil);
 SaveDialog.DefaultExt:='txt';
 SaveDialog.Filter:='Text files (*.txt)|*.TXT';
 Alist:=TStringList.Create;
 try
 //这部分是为了打开文件,如果这个文件名不存在就重新创建个;
 //把数据写入文件中
  AStr:='';
  ATitle:='';
  AList.Clear;

  //添加标题
  for i:=0 to frmDataPool.qry需要做的事.Fields.count-1 Do
  begin
  AFieldName:=frmDataPool.qry需要做的事.Fields[I].FieldName;
  ATitle:=ATitle+AFieldName+'|';
  end;
  AList.Insert(0,ATitle);

  //添加数据记录
  frmDataPool.qry需要做的事.First;
  while not frmDataPool.qry需要做的事.eof  do
  begin
  for i:=0 to frmDataPool.qry需要做的事.Fields.count-1 Do
  begin
  AFieldName:=frmDataPool.qry需要做的事.Fields[I].FieldName;
  AFieldValue:=frmDataPool.qry需要做的事.FieldByName(AFieldName).AsString;
  AStr:=AStr+AFieldValue+';';
  end;
  AList.Add(AStr);
  AStr:='';
  frmDataPool.qry需要做的事.Next;
  end;
 if SaveDialog.Execute then
 begin
    AList.SaveToFile(SaveDialog.FileName);
    ShowMessage('导出成功');
 end;
 finally
   Alist.free;
   SaveDialog.Free;
 end;
end;

 

 

方法2:类写法,注意不要写成ExportTXT 这样编译器不通过,不能用系统的标识符;

 

unit UExportExt;

interface
uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.ComCtrls, Data.DB, Data.Win.ADODB,
  Vcl.ExtCtrls, Vcl.DBCtrls, Vcl.Grids, Vcl.DBGrids, Clipbrd, Vcl.Menus,
  Vcl.StdCtrls, DBGridEhGrouping, ToolCtrlsEh, DBGridEhToolCtrls, DynVarsEh,
  EhLibVCL, GridsEh, DBAxisGridsEh, DBGridEh,EhLibADO,DBGridEhImpExp;
/// <summary>
/// 导出数据到记事本的写法,运用list的save方法
/// </summary>
type TExportExt=class
  public
  class procedure exportextall(var SAdq:TADOQuery);
end;

implementation
class procedure TExportExt.exportextall(var SAdq:TADOQuery);
var
AList:TStringList;
SaveDialog:TSaveDialog;
AStr,ATitle,AFieldName,AFieldValue:string;
i:Integer;
begin
 SaveDialog:=TSaveDialog.Create(nil);
 SaveDialog.DefaultExt:='txt';
 SaveDialog.Filter:='Text files (*.txt)|*.TXT';
 Alist:=TStringList.Create;
 try
 //这部分是为了打开文件,如果这个文件名不存在就重新创建个;
 //把数据写入文件中
  AStr:='';
  ATitle:='';
  AList.Clear;

  //添加标题
  for i:=0 to SAdq.Fields.count-1 Do
  begin
  AFieldName:=SAdq.Fields[I].FieldName;
  ATitle:=ATitle+AFieldName+'|';
  end;
  AList.Insert(0,ATitle);

  //添加数据记录
  SAdq.First;
  while not SAdq.eof  do
  begin
  for i:=0 to SAdq.Fields.count-1 Do
  begin
  AFieldName:=SAdq.Fields[I].FieldName;
  AFieldValue:=SAdq.FieldByName(AFieldName).AsString;
  AStr:=AStr+AFieldValue+';';
  end;
  AList.Add(AStr);
  AStr:='';
  SAdq.Next;
  end;
 if SaveDialog.Execute then
 begin
    AList.SaveToFile(SaveDialog.FileName);
    ShowMessage('导出成功');
 end;
 finally
   Alist.free;
   SaveDialog.Free;
 end;
end;

end.

 

类引用,记住uses中添加需要引用的类单元名UExportExt

 

procedure TForm3.N34Click(Sender: TObject);
begin
//用list的savetofile方法导出数据到记事本
TExportExt.exportextall(frmDataPool.qry需要做的事);
end;

 

posted @ 2017-06-22 11:02  delphi学习交流吧  阅读(670)  评论(0编辑  收藏  举报