文摘: MSN / QQ 中的动画表情 在Delphi中RichEdit的实现。

相信用过QQ、MSN中的动画表情对我们的吸引力了吧。在前几天我的一个小应用中需要添加这样的一个功能，首先从网上下载了RXLib2.75(包括RxRichEdit)，安装后测试了一下它提供的例子$(DELPHI)RXDemoRICHED2Richedit.dpr，在使用插入GIF图片时我发现了一个严重的问题：就是GIF图片是不会动的。因为原来对COM这些技术接触较少，只有上网查询资料，首先我去了大富翁www.delphibbs.com查找，不过没有查到，后来终于在网上查到了dtianx大侠的资料(见文章前面的链接)，不过我发现他提供的代码是C++下的，于是把这些代码转换了一下，使其在Delphi下也能用。 ...

原文出处: CSDN

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, ActiveX, ComCtrls, RxRichEd, ImageOleLib_TLB;

//RxRichEd单元是Rxlib下的RxRichEdit,一套增强功能的RichEdit
//ImageOleLib_TLB是从qq的ImageOle.dll引入的类型库

const
IID_IOleObject: TGUID = (
D1: $00000112; D2: $0000; D3: $0000; D4: ($C0, $00, $00, $00, $00, $00, $00,
$46));
EM_GETOLEINTERFACE = WM_USER + 60;
type
TForm1 = class(TForm)
Button1: TButton;
Editor: TRxRichEdit;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation
{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
FRTF: IRichEditOle;
FLockBytes: ILockBytes;
FStorage: ISTORAGE;
FClientSite: IOLECLIENTSITE;
m_lpObject: IOleObject;
m_lpAnimator: TGifAnimator;
i_GifAnimator: IGifAnimator;
reobject: TReObject;
clsid: TGuid;
sizel: tagSize;
dwStart, dwEnd: DWORD;
Rect:TRect;
begin
try
if CreateILockBytesOnHGlobal(0, True, FLockBytes) <> S_OK then
begin
showmessage('Error to create Global Heap');
exit;
end;
//建立一个混合文档存取对象
if StgCreateDocfileOnILockBytes(FLockBytes, STGM_SHARE_EXCLUSIVE or
STGM_CREATE or STGM_READWRITE, 0, FStorage) <> S_OK then
begin
Showmessage('Error to create storage');
exit;
end;
//取得RichEdit的接口
Sendmessage(Editor.handle,EM_GETOLEINTERFACE,0,LongInt(@FRTF));

if FRTF.GetClientSite(FClientSite)<>S_OK then
begin
ShowMessage('Error to get ClentSite');
Exit;
end;
CoInitializeEx(nil, COINIT_APARTMENTTHREADED);
m_lpAnimator := TGifAnimator.Create(Self);
i_GifAnimator := m_lpAnimator.ControlInterface;
i_GifAnimator.LoadFromFile('c:ti.gif');
i_GifAnimator.QueryInterface(IID_IOleObject, m_lpObject);
OleSetContainedObject(m_lpObject, True);
FillChar(ReObject, SizeOf(ReObject), 0);
ReObject.cbStruct := SizeOf(ReObject);
m_lpObject.GetUserClassID(clsid);
ReObject.clsid := clsid;
reobject.cp := REO_CP_SELECTION;
//content, but not static
reobject.dvaspect := DVASPECT_CONTENT;
//goes in the same line of text line
reobject.dwFlags := REO_BELOWBASELINE; //REO_RESIZABLE |
reobject.dwUser := 0;
//the very object
reobject.poleobj := m_lpObject;
//client site contain the object
reobject.polesite := FClientSite;
//the storage
reobject.pstg := FStorage;
sizel.cx := 0;
sizel.cy := 0;
reobject.sizel := sizel;
//Sel all text
SendMessage(Editor.Handle, EM_SETSEL, 0, -1);
SendMessage(Editor.Handle, EM_GETSEL, dwStart, dwEnd);
SendMessage(Editor.Handle, EM_SETSEL, dwEnd + 1, dwEnd + 1);
//Insert after the line of text
FRTF.InsertObject(reobject);
SendMessage(Editor.Handle, EM_SCROLLCARET, 0, 0);
//VARIANT_BOOL ret;
//do frame changing
m_lpAnimator.TriggerFrameChange();
//show it
m_lpObject.DoVerb(OLEIVERB_UIACTIVATE, Nil, FClientSite, 0, Editor.Handle,Rect);
// m_lpObject.DoVerb(
m_lpObject.DoVerb(OLEIVERB_SHOW, Nil, FClientSite, 0, Editor.Handle, Rect);
//redraw the window to show animation
redrawwindow(Handle, nil, 0, RDW_ERASE or RDW_INVALIDATE or RDW_FRAME or RDW_ERASENOW or RDW_ALLCHILDREN);
finally
FRTF:=nil;
FClientSite := nil;
FStorage :=nil;
end;
end;

end.