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.
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