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unit ClipStrm;
 
{
  This unit is Copyright (c) Alexey Mahotkin 1997-1998
  and may be used freely for any purpose. Please mail
  your comments to
  E-Mail: alexm@hsys.msk.ru
  FidoNet: Alexey Mahotkin, 2:5020/433
 
  This unit was developed during incorporating of TP Lex/Yacc
  into my project. Please visit ftp://ftp.nf.ru/pub/alexm
  or FREQ FILES from 2:5020/433 or mail me to get hacked
  version of TP Lex/Yacc which works under Delphi 2.0+.
}
 
 
interface uses Classes, Windows;
 
type
  TClipboardStream = class(TStream)
  private
    FMemory : pointer;
    FSize : longint;
    FPosition : longint;
    FFormat : word;
  public
    constructor Create(fmt : word);
    destructor Destroy; override;
 
    function Read(var Buffer; Count : Longint) : Longint; override;
    function Write(const Buffer; Count : Longint) : Longint; override;
    function Seek(Offset : Longint; Origin : Word) : Longint; override;
  end;
 
implementation uses SysUtils;
 
constructor TClipboardStream.Create(fmt : word);
 
var
  tmp : pointer;
  FHandle : THandle;
begin
FFormat := fmt;
OpenClipboard(0);
FHandle := GetClipboardData(FFormat);
FSize := GlobalSize(FHandle);
FMemory := AllocMem(FSize);
tmp := GlobalLock(FHandle);
MoveMemory(FMemory, tmp, FSize);
GlobalUnlock(FHandle);
FPosition := 0;
CloseClipboard;
end;
 
destructor TClipboardStream.Destroy;
begin
FreeMem(FMemory);
end;
 
function TClipboardStream.Read(var Buffer; Count : longint) : longint;
begin
if FPosition + Count > FSize then
  Result := FSize - FPosition
else
  Result := Count;
MoveMemory(@Buffer, PChar(FMemory) + FPosition, Result);
 
Inc(FPosition, Result);
end;
 
function TClipboardStream.Write(const Buffer; Count : longint) : longint;
var
  FHandle : HGlobal;
  tmp : pointer;
begin
ReallocMem(FMemory, FPosition + Count);
MoveMemory(PChar(FMemory) + FPosition, @Buffer, Count);
FPosition := FPosition + Count;
FSize := FPosition;
FHandle := GlobalAlloc(GMEM_MOVEABLE or GMEM_SHARE or GMEM_ZEROINIT, FSize);
try
  tmp := GlobalLock(FHandle);
  try
    MoveMemory(tmp, FMemory, FSize);
    OpenClipboard(0);
    SetClipboardData(FFormat, FHandle);
  finally
    GlobalUnlock(FHandle);
 
  end;
  CloseClipboard;
except
  GlobalFree(FHandle);
end;
Result := Count;
end;
 
function TClipboardStream.Seek(Offset : Longint; Origin : Word) : Longint;
begin
case Origin of
0 : FPosition := Offset;
1 : Inc(FPosition, Offset);
2 : FPosition := FSize + Offset;
end;
Result := FPosition;
end;
 
end.

Alexey Mahotkin alexm@hsys.msk.ru (2:5020/433)

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olmal@mail.ru

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