delphi 转换一批.bmp 文件为 .jpg

转换一批.bmp 文件为 .jpg

unit BMP2JPG_Unit;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls ,jpeg, ComCtrls, filectrl, Menus;

type
  TForm1 = class(TForm)
    SourceB: TButton;
    Source: TLabel;
    Target: TLabel;
    targetB: TButton;
    ConvertB: TButton;
    CQ: TTrackBar;
    CQL: TLabel;
    ListBox: TListBox;
    BRB: TButton;
    NOW: TCheckBox;
    Button1: TButton;
    USD: TCheckBox;
    StatusBar: TStatusBar;
    Label1: TLabel;
    Label2: TLabel;
    PopupMenu1: TPopupMenu;
    Addfiles1: TMenuItem;
    Remove1: TMenuItem;
    Convertthis1: TMenuItem;
    Batchrun1: TMenuItem;
    Removeall1: TMenuItem;
    procedure SourceBClick(Sender: TObject,',',');
    procedure targetBClick(Sender: TObject,',',');
    procedure ConvertBClick(Sender: TObject,',',');
    procedure CQChange(Sender: TObject,',',');
    procedure BRBClick(Sender: TObject,',',');
    procedure FormCreate(Sender: TObject,',',');
    procedure Button1Click(Sender: TObject,',',');
    procedure Addfiles1Click(Sender: TObject,',',');
    procedure Batchrun1Click(Sender: TObject,',',');
    procedure Convertthis1Click(Sender: TObject,',',');
    procedure Remove1Click(Sender: TObject,',',');
    procedure ListBoxClick(Sender: TObject,',',');
    procedure Removeall1Click(Sender: TObject,',',');
  private
    { Private declarations }
    outputdir:string;
    total:word;
  public
    { Public declarations }
    procedure bmp2jpg(FromBMP,ToJPG:string;Quality:byte,',',');
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.SourceBClick(Sender: TObject,',',');
var op:topendialog;  count:integer;
begin
  op:=topendialog.Create(nil,',',');
  op.Options:=[ofAllowMultiSelect,ofReadOnly,ofPathMustExist,ofFileMustExist];
  op.Filter:='*.bmp|*.bmp';
  op.Execute;
  if op.Files.Count>0 then
    begin
      listbox.Items.AddStrings(op.Files,',',');
      source.Caption:=listbox.Items[0];
      total:=listbox.Items.Count;
      statusbar.Panels[0].Text:='Total file '+inttostr(total,',',');
    end;
  op.Free;
end;

procedure TForm1.targetBClick(Sender: TObject,',',');
var op:tsavedialog;
begin
  op:=tsavedialog.Create(nil,',',');
  op.Options:=[ofReadOnly,ofPathMustExist];
  op.DefaultExt:='jpg';
  op.Filter:='*.jpg|*.jpg';
  op.Execute;
  target.Caption:=op.FileName;
  op.Free;
end;

procedure TForm1.ConvertBClick(Sender: TObject,',',');
var s:string;
begin
  if now.Checked and fileexists(target.Caption) then exit;
  statusbar.Panels[0].Text:='Converting...';
  statusbar.Panels[1].Text:='Current file :'+extractfilename(source.Caption,',',');
  sourceb.Enabled:=false;
  targetb.Enabled:=false;
  cq.Enabled:=false;
  convertb.Enabled:=false;
  if not directoryexists(target.Caption) then
    begin
      s:=source.Caption;
      target.Caption:=extractfilepath(s,',',');
      s:=extractfilename(s,',',');
      s:=copy(s,1,pos('.',s),',',');
      target.Caption:=target.Caption+s+'jpg';
    end;
  bmp2jpg(source.Caption,target.Caption,cq.Position,',',');
  sourceb.Enabled:=true;
  targetb.Enabled:=true;
  cq.Enabled:=true;
  convertb.Enabled:=true;
  statusbar.Panels[0].Text:='Ready';
  statusbar.Panels[1].Text:='';
end;

procedure TForm1.CQChange(Sender: TObject,',',');
begin
  cql.Caption:='Compress Qualify '+ inttostr(cq.Position,',',');
end;

procedure TForm1.BRBClick(Sender: TObject,',',');
var count:integer; s:string;
begin
  if listbox.Items.Count=0 then exit;
  SourceB.Enabled:=false;
  TargetB.Enabled:=false;
  ConvertB.Enabled:=false;
  if BRB.Caption='Cancel' then
    begin
      BRB.Caption:='Batch Run';
      SourceB.Enabled:=true;
      TargetB.Enabled:=true;
      ConvertB.Enabled:=true;
      total:=listbox.Items.Count;
      statusbar.Panels[1].Text:='Total file '+inttostr(total,',',');
      statusbar.Panels[0].Text:='Total file '+inttostr(total,',',');
    end  else
  BRB.Caption:='Cancel';
  for count:=0 to listbox.Items.Count-1 do
    begin
      S:=listbox.Items[0];
      Source.Caption:=s;
      if (usd.Checked) or (outputdir='')
        then  target.Caption:=extractfilepath(s)
        else  begin
                if not directoryexists(outputdir) then exit;
                if length(outputdir)=3
                  then target.Caption:=outputdir
                  else target.Caption:=outputdir+'\';
              end;
      s:=extractfilename(s,',',');
      s:=copy(s,1,pos('.',s),',',');
      target.Caption:=target.Caption+s+'jpg';
      if now.Checked and fileexists(target.Caption) then continue;
      Application.ProcessMessages;
      if BRB.Caption='Batch Run' then exit;
      statusbar.Panels[0].Text:='Converting...'+' ('+inttostr(count+1)+'/'+inttostr(total)+')';
      statusbar.Panels[1].Text:='Current file :'+extractfilename(source.Caption,',',');
      bmp2jpg(source.Caption,target.Caption,cq.Position,',',');
      listbox.Items.Delete(0,',',');
    end;
  SourceB.Enabled:=true;
  TargetB.Enabled:=true;
  ConvertB.Enabled:=true;
  BRB.Caption:='Batch Run';
  statusbar.Panels[0].Text:='Ready';
  statusbar.Panels[1].Text:='';
end;

procedure TForm1.bmp2jpg(FromBMP, ToJPG: string;Quality:byte,',',');
var jpg:tjpegimage;bmp:tbitmap;
begin
  if not fileexists(FromBMP) then exit;
  try
  bmp:=tbitmap.Create;
  bmp.LoadFromFile(FromBMP,',',');
  jpg:=tjpegimage.Create;
  jpg.Assign(bmp,',',');
  jpg.CompressionQuality:=Quality;
  jpg.Compress;
  jpg.SaveToFile(ToJPG,',',');
  finally
  bmp.Free;
  jpg.Free;
  end;
end;

procedure TForm1.FormCreate(Sender: TObject,',',');
begin
  cql.Caption:='Compress Qualify '+ inttostr(cq.Position,',',');
  outputdir:='';
  statusbar.Panels[0].Text:='Ready';
end;

procedure TForm1.Button1Click(Sender: TObject,',',');
begin
  selectdirectory('Select a output directory','',outputdir,',',');
  target.caption:=outputdir;
  if directoryexists(outputdir)
    then usd.Checked:=true
    else usd.Checked:=false;
end;

procedure TForm1.Addfiles1Click(Sender: TObject,',',');
begin
  SourceBClick(nil,',',');
end;

procedure TForm1.Batchrun1Click(Sender: TObject,',',');
begin
  BRBClick(nil,',',');
end;

procedure TForm1.Convertthis1Click(Sender: TObject,',',');
begin
  ConvertBClick(nil,',',');
end;

procedure TForm1.Remove1Click(Sender: TObject,',',');
begin
  Listbox.DeleteSelected;
  statusbar.Panels[0].Text:='Total file '+inttostr(total,',',');
end;

procedure TForm1.ListBoxClick(Sender: TObject,',',');
begin
  if listbox.SelCount>0 then
    begin
      Source.Caption:=ListBox.Items[Listbox.ItemIndex];
      Statusbar.Panels[1].Text:='Current select file '+Extractfilename(Source.Caption,',',');
    end;
end;

procedure TForm1.Removeall1Click(Sender: TObject,',',');
begin
  listbox.Clear;
  statusbar.Panels[0].Text:='Ready';
end;

end.