让DELPHI自带的richedit控件显示图片

让DELPHI自带的richedit控件显示图片

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unit RichEx;   { 2005-03-04 LiChengbin Added: Insert bitmap or gif into RichEdit controls from source file.   2005-01-31 LiChengbin Usage: Insert bitmap into RichEdit controls by IRichEditOle interface and implementation of IDataObject interface.   Example: InsertBitmap(RichEdit1.Handle, Image1.Picture.Bitmap); }   interface   uses   Windows, Messages, Graphics, ActiveX, ComObj;   const     // Flags to specify which interfaces should be returned in the structure above   REO_GETOBJ_NO_INTERFACES = $00000000;   REO_GETOBJ_POLEOBJ = $00000001;   REO_GETOBJ_PSTG = $00000002;   REO_GETOBJ_POLESITE = $00000004;   REO_GETOBJ_ALL_INTERFACES = $00000007;     // Place object at selection   REO_CP_SELECTION = $FFFFFFFF;     // Use character position to specify object instead of index   REO_IOB_SELECTION = $FFFFFFFF;   REO_IOB_USE_CP = $FFFFFFFF;     // object flags   REO_NULL = $00000000;                      // No flags   REO_READWRITEMASK = $0000003F;             // Mask out RO bits   REO_DONTNEEDPALETTE = $00000020;           // object doesn't need palette   REO_BLANK = $00000010;                     // object is blank   REO_DYNAMICSIZE = $00000008;               // object defines size always   REO_INVERTEDSELECT = $00000004;            // object drawn all inverted if sel   REO_BELOWBASELINE = $00000002;             // object sits below the baseline   REO_RESIZABLE = $00000001;                 // object may be resized   REO_LINK = $80000000;                      // object is a link (RO)   REO_STATIC = $40000000;                    // object is static (RO)   REO_SELECTED = $08000000;                  // object selected (RO)   REO_OPEN = $04000000;                      // object open in its server (RO)   REO_INPLACEACTIVE = $02000000;             // object in place active (RO)   REO_HILITED = $01000000;                   // object is to be hilited (RO)   REO_LINKAVAILABLE = $00800000;             // Link believed available (RO)   REO_GETMETAFILE = $00400000;               // object requires metafile (RO)     // flags for IRichEditOle::GetClipboardData(),   // IRichEditOleCallback::GetClipboardData() and   // IRichEditOleCallback::QueryAcceptData()   RECO_PASTE = $00000000;                    // paste from clipboard   RECO_DROP = $00000001;                     // drop   RECO_COPY = $00000002;                     // copy to the clipboard   RECO_CUT = $00000003;                      // cut to the clipboard   RECO_DRAG = $00000004;                     // drag     EM_GETOLEINTERFACE = WM_USER + 60;   IID_IUnknown: TGUID = (     D1: $00000000;     D2: $0000;     D3: $0000;     D4: ($C0, $00, $00, $00, $00, $00, $00, $46)   );   IID_IOleObject: TGUID = (     D1: $00000112;     D2: $0000;     D3: $0000;     D4: ($C0, $00, $00, $00, $00, $00, $00, $46)   );   IID_IGifAnimator: TGUID = '{0C1CF2DF-05A3-4FEF-8CD4-F5CFC4355A16}';   CLASS_GifAnimator: TGUID = '{06ADA938-0FB0-4BC0-B19B-0A38AB17F182}';   type   _ReObject = record     cbStruct: DWORD;                         { Size of structure           }     cp: ULONG;                               { Character position of object   }     clsid: TCLSID;                           { class ID of object           }     poleobj: IOleObject;                     { OLE object interface         }     pstg: IStorage;                          { Associated storage interface   }     polesite: IOleClientSite;                { Associated client site interface }     sizel: TSize;                            { Size of object (may be 0,0)     }     dvAspect: Longint;                       { Display aspect to use         }     dwFlags: DWORD;                          { object status flags         }     dwUser: DWORD;                           { Dword for user's use         }   end;     TReObject = _ReObject;     TCharRange = record     cpMin: Integer;     cpMax: Integer;   end;     TFormatRange = record     hdc: Integer;     hdcTarget: Integer;     rectRegion: TRect;     rectPage: TRect;     chrg: TCharRange;   end;     IRichEditOle = interface(IUnknown)     ['{00020d00-0000-0000-c000-000000000046}']     function GetClientSite(out clientSite: IOleClientSite): HResult; stdcall;     function GetObjectCount: HResult; stdcall;     function GetLinkCount: HResult; stdcall;     function GetObject(iob: Longint; out reobject: TReObject; dwFlags: DWORD): HResult; stdcall;     function InsertObject(var reobject: TReObject): HResult; stdcall;     function ConvertObject(iob: Longint; rclsidNew: TIID; lpstrUserTypeNew: LPCSTR): HResult; stdcall;     function ActivateAs(rclsid: TIID; rclsidAs: TIID): HResult; stdcall;     function SetHostNames(lpstrContainerApp: LPCSTR; lpstrContainerObj: LPCSTR): HResult; stdcall;     function SetLinkAvailable(iob: Longint; fAvailable: BOOL): HResult; stdcall;     function SetDvaspect(iob: Longint; dvaspect: DWORD): HResult; stdcall;     function HandsOffStorage(iob: Longint): HResult; stdcall;     function SaveCompleted(iob: Longint; const stg: IStorage): HResult; stdcall;     function InPlaceDeactivate: HResult; stdcall;     function ContextSensitiveHelp(fEnterMode: BOOL): HResult; stdcall;     function GetClipboardData(var chrg: TCharRange; reco: DWORD; out dataobj: IDataObject): HResult; stdcall;     function ImportDataObject(dataobj: IDataObject; cf: TClipFormat; hMetaPict: HGLOBAL): HResult; stdcall;   end;     // *********************************************************************//   // interface: IGifAnimator   // Flags:   (4544) Dual NonExtensible OleAutomation Dispatchable   // GUID:     {0C1CF2DF-05A3-4FEF-8CD4-F5CFC4355A16}   // *********************************************************************//   IGifAnimator = interface(IDispatch)     ['{0C1CF2DF-05A3-4FEF-8CD4-F5CFC4355A16}']     procedure LoadFromFile(const FileName: WideString); safecall;     function TriggerFrameChange: WordBool; safecall;     function GetFilePath: WideString; safecall;     procedure ShowText(const Text: WideString); safecall;   end;     // *********************************************************************//   // DispIntf: IGifAnimatorDisp   // Flags:   (4544) Dual NonExtensible OleAutomation Dispatchable   // GUID:     {0C1CF2DF-05A3-4FEF-8CD4-F5CFC4355A16}   // *********************************************************************//   IGifAnimatorDisp = dispinterface     ['{0C1CF2DF-05A3-4FEF-8CD4-F5CFC4355A16}']     procedure LoadFromFile(const FileName: WideString); dispid 1;     function TriggerFrameChange: WordBool; dispid 2;     function GetFilePath: WideString; dispid 3;     procedure ShowText(const Text: WideString); dispid 4;   end;     TBitmapOle = class(TInterfacedObject, IDataObject)   private     FStgm: TStgMedium;     FFmEtc: TFormatEtc;     procedure SetBitmap(hBitmap: HBITMAP);     procedure GetOleObject(OleSite: IOleClientSite; Storage: IStorage; var OleObject: IOleObject);   public     { ======================================================================= }     { implementation of IDataObject interface }     function GetData(const formatetcIn: TFormatEtc; out medium: TStgMedium): HResult; stdcall;     function GetDataHere(const formatetc: TFormatEtc; out medium: TStgMedium): HResult; stdcall;     function QueryGetData(const formatetc: TFormatEtc): HResult; stdcall;     function GetCanonicalFormatEtc(const formatetc: TFormatEtc; out formatetcOut: TFormatEtc): HResult; stdcall;     function SetData(const formatetc: TFormatEtc; var medium: TStgMedium; fRelease: BOOL): HResult; stdcall;     function EnumFormatEtc(dwDirection: Longint; out enumFormatEtc: IEnumFormatEtc): HResult; stdcall;     function DAdvise(const formatetc: TFormatEtc; advf: Longint; const advSink: IAdviseSink; out dwConnection: Longint): HResult; stdcall;     function DUnadvise(dwConnection: Longint): HResult; stdcall;     function EnumDAdvise(out enumAdvise: IEnumStatData): HResult; stdcall;     { ======================================================================= }   end;   function InsertBitmap(hRichEdit: THandle; const FileName: string): Boolean; overload;   function InsertBitmap(hRichEdit: THandle; Bitmap: TBitmap): Boolean; overload;   function InsertGif(hRichEdit: THandle; const FileName: string): Boolean;   implementation   function GetRichEditOle(hRichEdit: THandle): IRichEditOle; begin   SendMessage(hRichEdit, EM_GETOLEINTERFACE, 0, Longint(@Result)); end;   function GetImage(Bitmap: TBitmap): HBITMAP; var   Dest: HBitmap;   DC, MemDC: HDC;   OldBitmap: HBITMAP; begin   DC := GetDC(0);   MemDC := CreateCompatibleDC(DC);   try     Dest := CreateCompatibleBitmap(DC, Bitmap.Width, Bitmap.Height);     OldBitmap := SelectObject(MemDC, Dest);     BitBlt(MemDC, 0, 0, Bitmap.Width, Bitmap.Height, Bitmap.Canvas.Handle, 0, 0, SRCCOPY);     SelectObject(MemDC, OldBitmap);   finally     DeleteDC(MemDC);     ReleaseDC(0, DC);   end;   Result := Dest; end;   function TBitmapOle.GetData(const formatetcIn: TFormatEtc; out medium: TStgMedium): HResult; stdcall; begin   medium.tymed := TYMED_GDI;   medium.hBitmap := OleDuplicateData(FStgm.hBitmap, CF_BITMAP, 0);   medium.unkForRelease := nil;   if medium.hBitmap = 0 then     Result := E_HANDLE   else     Result := S_OK; end;   function TBitmapOle.GetDataHere(const formatetc: TFormatEtc; out medium: TStgMedium): HResult; stdcall; begin   Result := E_NOTIMPL; end;   function TBitmapOle.QueryGetData(const formatetc: TFormatEtc): HResult; stdcall; begin   Result := E_NOTIMPL; end;   function TBitmapOle.GetCanonicalFormatEtc(const formatetc: TFormatEtc; out formatetcOut: TFormatEtc): HResult; stdcall; begin   Result := E_NOTIMPL; end;   function TBitmapOle.SetData(const formatetc: TFormatEtc; var medium: TStgMedium; fRelease: BOOL): HResult; stdcall; begin   FStgm := medium;   FFmEtc := formatetc;   Result := S_OK; end;   function TBitmapOle.EnumFormatEtc(dwDirection: Longint; out enumFormatEtc: IEnumFormatEtc): HResult; stdcall; begin   Result := E_NOTIMPL; end;   function TBitmapOle.DAdvise(const formatetc: TFormatEtc; advf: Longint; const advSink: IAdviseSink; out dwConnection: Longint): HResult; stdcall; begin   Result := E_NOTIMPL; end;   function TBitmapOle.DUnadvise(dwConnection: Longint): HResult; stdcall; begin   Result := E_NOTIMPL; end;   function TBitmapOle.EnumDAdvise(out enumAdvise: IEnumStatData): HResult; stdcall; begin   Result := E_NOTIMPL; end;   procedure TBitmapOle.GetOleObject(OleSite: IOleClientSite; Storage: IStorage; var OleObject: IOleObject); begin   OleCheck(OleCreateStaticFromData(Self, IID_IOleObject, OLERENDER_FORMAT, @FFmEtc, OleSite, Storage, OleObject)); end;   procedure TBitmapOle.SetBitmap(hBitmap: hBitmap); var   Stgm: TStgMedium;   FmEtc: TFormatEtc; begin   Stgm.tymed := TYMED_GDI;                   // Storage medium = HBITMAP handle   Stgm.hBitmap := hBitmap;   Stgm.unkForRelease := nil;     FmEtc.cfFormat := CF_BITMAP;               // Clipboard format = CF_BITMAP   FmEtc.ptd := nil;                          // Target Device = Screen   FmEtc.dwAspect := DVASPECT_CONTENT;        // Level of detail = Full content   FmEtc.lindex := -1;                        // Index = Not applicaple   FmEtc.tymed := TYMED_GDI;                  // Storage medium = HBITMAP handle     SetData(FmEtc, Stgm, True); end;   function InsertBitmap(hRichEdit: THandle; const FileName: string): Boolean; var   ReOle: IRichEditOle;   OleSite: IOleClientSite;   Storage: IStorage;   LockBytes: ILockBytes;   OleObject: IOleObject;   ReObj: TReObject;   TempOle: IUnknown;   FormatEtc: TFormatEtc; begin   ReOle := GetRichEditOle(hRichEdit);   Assert(ReOle <> nil, 'RichEditOle is null!');     ReOle.GetClientSite(OleSite);     OleCheck(CreateILockBytesOnHGlobal(0, True, LockBytes));   Assert(LockBytes <> nil, 'LockBytes is null!');     OleCheck(StgCreateDocfileOnILockBytes(LockBytes, STGM_SHARE_EXCLUSIVE or STGM_CREATE or STGM_READWRITE, 0, Storage));   Assert(Storage <> nil, 'Storage is null!');     OleCheck(OleCreateFromFile(GUID_NULL, PWideChar(WideString(FileName)), IID_IUnknown, 0, @FormatEtc, OleSite, Storage, TempOle));   OleCheck(TempOle.QueryInterface(IID_IOleObject, OleObject));   OleCheck(OleSetContainedObject(OleObject, True));   Assert(OleObject <> nil, 'OleObject is null!');     FillChar(ReObj, Sizeof(ReObj), 0);   ReObj.cbStruct := Sizeof(ReObj);   OleCheck(OleObject.GetUserClassID(ReObj.clsid));   ReObj.cp := REO_CP_SELECTION;   ReObj.dvaspect := DVASPECT_CONTENT;   ReObj.poleobj := OleObject;   ReObj.polesite := OleSite;   ReObj.pstg := Storage;   ReObj.dwUser := 0;   ReObj.sizel.cx := 0;   ReObj.sizel.cy := 0;     ReOle.InsertObject(ReObj);   Result := True; end;   function InsertBitmap(hRichEdit: THandle; Bitmap: TBitmap): Boolean; var   ReOle: IRichEditOle;   BitmapOle: TBitmapOle;   OleSite: IOleClientSite;   Storage: IStorage;   LockBytes: ILockBytes;   OleObject: IOleObject;   ReObj: TReObject; begin   ReOle := GetRichEditOle(hRichEdit);   Assert(ReOle <> nil, 'RichEditOle is null!');   BitmapOle := TBitmapOle.Create;   try     BitmapOle.SetBitmap(GetImage(Bitmap));     ReOle.GetClientSite(OleSite);       OleCheck(CreateILockBytesOnHGlobal(0, True, LockBytes));     Assert(LockBytes <> nil, 'LockBytes is null!');       OleCheck(StgCreateDocfileOnILockBytes(LockBytes, STGM_SHARE_EXCLUSIVE or STGM_CREATE or STGM_READWRITE, 0, Storage));     Assert(Storage <> nil, 'Storage is null!');       BitmapOle.GetOleObject(OleSite, Storage, OleObject);     OleCheck(OleSetContainedObject(OleObject, True));       FillChar(ReObj, Sizeof(ReObj), 0);     ReObj.cbStruct := Sizeof(ReObj);     OleCheck(OleObject.GetUserClassID(ReObj.clsid));     ReObj.cp := REO_CP_SELECTION;     ReObj.dvaspect := DVASPECT_CONTENT;     ReObj.poleobj := OleObject;     ReObj.polesite := OleSite;     ReObj.pstg := Storage;       ReOle.InsertObject(ReObj);     Result := True;   finally     BitmapOle.Free;   end; end;   function InsertGif(hRichEdit: THandle; const FileName: string): Boolean; var   ReOle: IRichEditOle;   OleSite: IOleClientSite;   Storage: IStorage;   LockBytes: ILockBytes;   OleObject: IOleObject;   ReObj: TReObject;   Animator: IGifAnimator; begin   ReOle := GetRichEditOle(hRichEdit);   Assert(ReOle <> nil, 'RichEditOle is null!');   Assert(FileName <> '', 'FileName is null!');     ReOle.GetClientSite(OleSite);     OleCheck(CreateILockBytesOnHGlobal(0, True, LockBytes));   Assert(LockBytes <> nil, 'LockBytes is null!');     OleCheck(StgCreateDocfileOnILockBytes(LockBytes, STGM_SHARE_EXCLUSIVE or STGM_CREATE or STGM_READWRITE, 0, Storage));   Assert(Storage <> nil, 'Storage is null!');     Animator := IUnknown(CreateComObject(CLASS_GifAnimator)) as IGifAnimator;   Animator.LoadFromFile(PWideChar(WideString(FileName)));   OleCheck(Animator.QueryInterface(IID_IOleObject, OleObject));     OleCheck(OleSetContainedObject(OleObject, True));   FillChar(ReObj, Sizeof(ReObj), 0);   ReObj.cbStruct := Sizeof(ReObj);   OleCheck(OleObject.GetUserClassID(ReObj.clsid));   ReObj.cp := REO_CP_SELECTION;   ReObj.dvaspect := DVASPECT_CONTENT;   ReObj.dwFlags := REO_STATIC or REO_BELOWBASELINE;   ReObj.dwUser := 0;   ReObj.poleobj := OleObject;   ReObj.polesite := OleSite;   ReObj.pstg := Storage;   ReObj.sizel.cx := 0;   ReObj.sizel.cy := 0;     ReOle.InsertObject(ReObj);   Result := True; end;   end.