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| unit F_DragDrop;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, OleCtnrs, StdCtrls, ActiveX, ComObj, ShellAPI, ComCtrls, ExtCtrls;
type
TfmMain = class(TForm, IDropTarget)
paMain: TPanel;
re: TRichEdit;
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
private
{ Déclarations privées }
public
{ Déclarations publiques }
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;
end;
var
fmMain: TfmMain;
implementation
{$R *.dfm}
procedure TfmMain.FormCreate(Sender: TObject);
begin
OleInitialize(nil);
OleCheck(RegisterDragDrop(Handle, Self));
end;
procedure TFmMain.FormDestroy(Sender: TObject);
begin
RevokeDragDrop(Handle);
OleUninitialize;
end;
function TFmMain.DragEnter(const dataObj: IDataObject; grfKeyState: Longint; pt: TPoint; var dwEffect: Longint): HResult;
begin
Result := S_OK;
end;
function TFmMain.DragOver(grfKeyState: Longint; pt: TPoint; var dwEffect: Longint): HResult;
Var n : int64;
Begin
Result := S_OK;
end;
function TFmMain.DragLeave: HResult;
begin
Result := S_OK;
end;
function TFmMain.Drop(const dataObj: IDataObject; grfKeyState: Longint; pt: TPoint; var dwEffect: Longint): HResult;
var
aFmtEtc: TFORMATETC;
aStgMed: TSTGMEDIUM;
pData: PChar;
begin
if (dataObj = nil) then
raise Exception.Create('IDataObject-Pointer is not valid!');
with aFmtEtc do
begin
cfFormat := CF_TEXT;
ptd := nil;
dwAspect := DVASPECT_CONTENT;
lindex := -1;
tymed := TYMED_HGLOBAL;
end;
OleCheck(dataObj.GetData(aFmtEtc, aStgMed));
try
pData := GlobalLock(aStgMed.hGlobal);
re.Clear;
re.SetSelTextBuf(pData);
finally
GlobalUnlock(aStgMed.hGlobal);
ReleaseStgMedium(aStgMed);
end;
Result := S_OK;
end;
end. |
Partager