Исправление загрузки RTF текста через поток
Falk0ner, вс, 06/07/2008 - 15:34.
Исправление загрузки RTF текста через поток Автор: Лагонский Сергей Николаевич
В версии Borland Delphi 3 Client/Server я обнаружил, что при загрузке текста формата RTF методом "LoadFromStream" в компонент TRichEdit он не интерпретируется как RTF, а отображается полностью (со всеми управляющими символами). Разбираясь в исходном тексте модуля COMCTRLS.PAS (дата создания: 4 августа 1997 года, размер: 391728 байт) я нашел причину, из-за которой вышеуказанный метод не работал как надо. Ниже я привожу исходный и исправленный тексты реализации метода "TRichEditStrings.LoadFromStream" (измененные строки отмечены символом "!"):
1. Исходный текст
procedure TRichEditStrings.LoadFromStream(Stream: TStream);
var
EditStream: TEditStream;
Position: Longint;
TextType: Longint;
StreamInfo: TRichEditStreamInfo;
Converter: TConversion;
begin
StreamInfo.Stream := Stream;
if FConverter <> nil then
Converter := FConverter
else
Converter := RichEdit.DefaultConverter.Create;
StreamInfo.Converter := Converter;
try
with EditStream do
begin
dwCookie := LongInt(Pointer(@StreamInfo));
pfnCallBack := @StreamLoad;
dwError := 0;
end;
Position := Stream.Position;
if PlainText then
TextType := SF_TEXT
else
TextType := SF_RTF;
SendMessage(RichEdit.Handle, EM_STREAMIN, TextType, Longint(@EditStream));
if (TextType = SF_RTF) and (EditStream.dwError <> 0) then
begin
Stream.Position := Position;
! if PlainText then
TextType := SF_RTF
!
else
TextType := SF_TEXT;
SendMessage(RichEdit.Handle, EM_STREAMIN, TextType, Longint(@EditStream));
if EditStream.dwError <> 0 then
raise EOutOfResources.Create(sRichEditLoadFail);
end;
finally
if FConverter = nil then
Converter.Free;
end;
end;
var
EditStream: TEditStream;
Position: Longint;
TextType: Longint;
StreamInfo: TRichEditStreamInfo;
Converter: TConversion;
begin
StreamInfo.Stream := Stream;
if FConverter <> nil then
Converter := FConverter
else
Converter := RichEdit.DefaultConverter.Create;
StreamInfo.Converter := Converter;
try
with EditStream do
begin
dwCookie := LongInt(Pointer(@StreamInfo));
pfnCallBack := @StreamLoad;
dwError := 0;
end;
Position := Stream.Position;
if PlainText then
TextType := SF_TEXT
else
TextType := SF_RTF;
SendMessage(RichEdit.Handle, EM_STREAMIN, TextType, Longint(@EditStream));
if (TextType = SF_RTF) and (EditStream.dwError <> 0) then
begin
Stream.Position := Position;
! if PlainText then
TextType := SF_RTF
!
else
TextType := SF_TEXT;
SendMessage(RichEdit.Handle, EM_STREAMIN, TextType, Longint(@EditStream));
if EditStream.dwError <> 0 then
raise EOutOfResources.Create(sRichEditLoadFail);
end;
finally
if FConverter = nil then
Converter.Free;
end;
end;
2. Текст с исправлением:
procedure TRichEditStrings.LoadFromStream(Stream: TStream);
var
EditStream: TEditStream;
Position: Longint;
TextType: Longint;
StreamInfo: TRichEditStreamInfo;
Converter: TConversion;
begin
StreamInfo.Stream := Stream;
if FConverter <> nil then
Converter := FConverter
else
Converter := RichEdit.DefaultConverter.Create;
StreamInfo.Converter := Converter;
try
with EditStream do
begin
dwCookie := LongInt(Pointer(@StreamInfo));
pfnCallBack := @StreamLoad;
dwError := 0;
end;
Position := Stream.Position;
if PlainText then
TextType := SF_TEXT
else
TextType := SF_RTF;
SendMessage(RichEdit.Handle, EM_STREAMIN, TextType, Longint(@EditStream));
if (TextType = SF_RTF) and (EditStream.dwError <> 0) then
begin
Stream.Position := Position;
! if PlainText then
TextType := SF_TEXT
!
else
TextType := SF_RTF;
SendMessage(RichEdit.Handle, EM_STREAMIN, TextType, Longint(@EditStream));
if EditStream.dwError <> 0 then
raise EOutOfResources.Create(sRichEditLoadFail);
end;
finally
if FConverter = nil then
Converter.Free;
end;
end;
var
EditStream: TEditStream;
Position: Longint;
TextType: Longint;
StreamInfo: TRichEditStreamInfo;
Converter: TConversion;
begin
StreamInfo.Stream := Stream;
if FConverter <> nil then
Converter := FConverter
else
Converter := RichEdit.DefaultConverter.Create;
StreamInfo.Converter := Converter;
try
with EditStream do
begin
dwCookie := LongInt(Pointer(@StreamInfo));
pfnCallBack := @StreamLoad;
dwError := 0;
end;
Position := Stream.Position;
if PlainText then
TextType := SF_TEXT
else
TextType := SF_RTF;
SendMessage(RichEdit.Handle, EM_STREAMIN, TextType, Longint(@EditStream));
if (TextType = SF_RTF) and (EditStream.dwError <> 0) then
begin
Stream.Position := Position;
! if PlainText then
TextType := SF_TEXT
!
else
TextType := SF_RTF;
SendMessage(RichEdit.Handle, EM_STREAMIN, TextType, Longint(@EditStream));
if EditStream.dwError <> 0 then
raise EOutOfResources.Create(sRichEditLoadFail);
end;
finally
if FConverter = nil then
Converter.Free;
end;
end;
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