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DllMemU.pas
资源名称:delphi.rar [点击查看]
上传用户:fh681027
上传日期:2022-07-23
资源大小:1959k
文件大小:1k
源码类别:
Delphi控件源码
开发平台:
Delphi
- unit DllMemU;
- interface
- uses
- Windows, SysUtils;
- procedure SetData (I: Integer); stdcall;
- function GetData: Integer; stdcall;
- procedure SetShareData (I: Integer); stdcall;
- function GetShareData: Integer; stdcall;
- implementation
- // global DLL data
- var
- PlainData: Integer = 0; // not shared
- ShareData: ^Integer; // shared
- hMapFile: THandle;
- const
- VirtualFileName = 'ShareDllData';
- DataSize = sizeof (Integer);
- // plain (non shared) data read and write
- procedure SetData (I: Integer); stdcall;
- begin
- PlainData := I;
- end;
- function GetData: Integer; stdcall;
- begin
- Result := PlainData;
- end;
- // shared data read and write
- procedure SetShareData (I: Integer); stdcall;
- begin
- ShareData^ := I;
- end;
- function GetShareData: Integer; stdcall;
- begin
- Result := ShareData^;
- end;
- initialization
- //create memory mapped file
- hMapFile := CreateFileMapping ($FFFFFFFF, nil,
- Page_ReadWrite, 0, DataSize, VirtualFileName);
- if hMapFile = 0 then
- raise Exception.Create ('Error creating memory mapped file');
- // get the pointer to the actual data
- ShareData := MapViewOfFile (
- hMapFile, File_Map_Write, 0, 0, DataSize);
- finalization
- UnmapViewOfFile (ShareData);
- CloseHandle (hMapFile);
- end.