我做了个和flashget一样的悬浮窗(就是半透明的那个),现在希望把一个页面上的文字和连接拖动到上边,我已经可以得到这些文字和链接了,但是得不到这些文字和链接所在的页面信息。哪位大虾知道的话,请告知~ 100分送上告诉我相关的原理和资料也可以 thanks了
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下面DragDrop.pas不是我写的:
unit DragDrop;interfaceuses
Windows, ActiveX, ComObj,Dialogs,Sysutils;type
TDropEvent = procedure(Sender:TObject;Msg:Pchar)of object;
TTMyDrop = class(TComObject, IDropTarget)
private
FOnDroped: TDropEvent;
procedure SetOnDroped(const Value: TDropEvent);
protected
{Declare IDropTarget methods here}
function DragEnter(const dataObj: IDataObject; grfKeyState: Longint;
pt: TPoint; var dwEffect: Longint): HResult; stdcall;
function DragOver(grfKeyState: Longint; pt: TPoint;
var dwEffect: Longint): HResult; stdcall;
function DragLeave: HResult; stdcall;
function Drop(const dataObj: IDataObject; grfKeyState: Longint; pt: TPoint;
var dwEffect: Longint): HResult; stdcall;
public
property OnDroped:TDropEvent read FOnDroped write SetOnDroped;
end;const
Class_TMyDrop: TGUID = '{846C94F8-7649-11D2-9836-0000E82EA1B1}';implementationuses ComServ,unit1;{ TTMyDrop }function TTMyDrop.DragEnter(const dataObj: IDataObject;
grfKeyState: Integer; pt: TPoint; var dwEffect: Integer): HResult;
var
enumFormatEtc: IEnumFormatEtc;
f:TFORMATETC;
count:Integer;
Found:boolean;
begin
dataObj.EnumFormatEtc(DATADIR_GET,enumFormatEtc);
Found:=false;
while (enumFormatEtc.Next(1,f,@count)=S_OK)and (count>0) do
begin
if (f.cfFormat=CF_TEXT) then
begin
Found:=true;
Break;
end;
end;
if Found then
Result:=S_OK
else
begin
result:=E_INVALIDARG;
dwEffect:=DROPEFFECT_NONE;
end;
end;function TTMyDrop.DragLeave: HResult;
begin
result := S_OK;
end;function TTMyDrop.DragOver(grfKeyState: Integer; pt: TPoint;
var dwEffect: Integer): HResult;
begin
result := S_OK;
end;function TTMyDrop.Drop(const dataObj: IDataObject; grfKeyState: Integer;
pt: TPoint; var dwEffect: Integer): HResult;
var
enumFormatEtc: IEnumFormatEtc;
f:TFORMATETC;
count:Integer;
Found:boolean;
medium: TStgMedium;
begin
dataObj.EnumFormatEtc(DATADIR_GET,enumFormatEtc);
Found:=false;
while (enumFormatEtc.Next(1,f,@count)=S_OK)and (count>0) do
begin
if (f.cfFormat=CF_TEXT) then
begin
Found:=true;
Break;
end;
end;
if not Found then
begin
result:=E_INVALIDARG;
dwEffect:=DROPEFFECT_NONE;
Exit;
end;
dataObj.GetData(f,medium);
if medium.tymed =1 then
begin
if Assigned(fOnDroped) then
begin
fOnDroped(Self,PChar(GlobalLock(medium.hglobal)));
GlobalUnLock(medium.hglobal);
end;
result := S_OK;
end;end;procedure TTMyDrop.SetOnDroped(const Value: TDropEvent);
begin
FOnDroped := Value;
end;initialization
TComObjectFactory.Create(ComServer, TTMyDrop, Class_TMyDrop,
'TMyDrop', '', ciMultiInstance{, tmApartment});
end.在自己的程序中,在FormCreate的时候,加入: OleInitialize(NIL);
dd := TTMyDrop.Create;
dd.OnDroped:=DoDroped;
res1 := CoLockObjectExternal(dd, true, false);
res := RegisterDragDrop(Handle, IDropTarget(dd));其中,DoDroped在拖放发生时被调用:
procedure TForm1.DoDroped(Sender: TObject; Msg: Pchar);
begin
...//此处最好不要有太耗时的工作,因为被拖出的程序(比如说是浏览器)
//要等待此事件结束
end;在FormDestroy时:
RevokeDragDrop(Handle);
OleUninitialize;