wmftoemfu.pas

DelphiWin32核心API参考光盘内容.是学习书籍中的源码,便于学习.

unit WMFtoEMFU;
{==============================================================================
  This application demonstrates how to use Delphi's encapsulation of metafiles
  to easily convert older Windows metafiles into the newer enhanced metafile
  format.  This same technique could easily be modified to do the conversion
  in the opposite direction.  Enjoy!
 ==============================================================================}
interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, Buttons, FileCtrl, ComCtrls;

type
  TForm1 = class(TForm)
    DriveComboBox1: TDriveComboBox;
    DirectoryListBox1: TDirectoryListBox;
    FileListBox1: TFileListBox;
    DriveComboBox2: TDriveComboBox;
    DirectoryListBox2: TDirectoryListBox;
    BitBtn1: TBitBtn;
    StatusBar1: TStatusBar;
    ProgressBar1: TProgressBar;
    procedure BitBtn1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.BitBtn1Click(Sender: TObject);
var
   Converted: Integer;    // used to indicate conversion progress
   iLoop: Integer;        // general loop control
   TempMeta: TMetafile;   // a Delphi metafile object
begin
  {create the temporary metafile}
  TempMeta:=TMetaFile.Create;

  {convert selected files}
  Converted := 0;
  for iLoop := 0 to FileListBox1.Items.Count-1 do
  begin
    {if this file is selected...}
    if FileListBox1.Selected[iLoop] then
    begin
      {...load the WMF file...}
      TempMeta.LoadFromFile(DirectoryListBox1.Directory+'\'+FileListBox1.Items[iLoop]);

      {...convert it into an enhanced Windows metafile...}
      TempMeta.Enhanced := TRUE;

      {...and save the new enhanced metafile to disk}
      TempMeta.SaveToFile(DirectoryListBox2.Directory+'\'+ChangeFileExt(FileListBox1.Items[iLoop],'.EMF'));

      {display our progress}
      Inc(Converted);
      ProgressBar1.Position := (Converted div FileListBox1.SelCount)*100;
    end;

    {clear the temporary metafile and update the progress bar}
    TempMeta.Clear;
    Application.ProcessMessages;
  end;

  {we are done, so free the temporary metafile and reset the progress bar}
  ProgressBar1.Position := 0;
  TempMeta.free;
end;

end.