sendunit.pas

Delphi 7经典问题解析

unit sendunit;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Label1: TLabel;
    BitBtn1: TBitBtn;
    procedure BitBtn1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private
    { Private declarations }
  public
    procedure SendData;
    { Public declarations }
  end;

var
  Form1: TForm1;
  MapFilehWnd: THandle;
  MapFilePointer: Pointer;
implementation

{$R *.dfm}
procedure TForm1.SendData; //发送消息和数据过程
begin
 MapFilehWnd := CreateFileMapping ($FFFFFFFF,nil,page_ReadWrite, 0,10000,'MapFileDemo');
 if MapFilehWnd  <> 0 then
  begin
   MapFilePointer := MapViewOfFile (MapFilehWnd ,FILE_MAP_ALL_ACCESS,0, 0, 0);
   StrCopy(PChar(MapFilePointer),PChar (Edit1.Text));
  end;  
end;

procedure TForm1.BitBtn1Click(Sender: TObject);
begin
 if Edit1.Text<>'' then
  SendData;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
 MapFilehWnd:=0;
 MapFilePointer:=Nil;
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
 if MapFilePointer<>Nil then
  begin
   UnmapViewOfFile(MapFilePointer);
   CloseHandle(MapFilehWnd);
  end; 
end;

end.