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Excel doesn't want to open

Posted on 2001-07-10
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Last Modified: 2010-04-06
I use this code for open Excel with parameters but until I close my Delphi(until I close the delphi application I can't open again Excel, there is no mistake ) application Excel doesn't want to open :

function TForm1.CreateProcessAndWait(const AppPath, AppParams: String;
          Visibility: word): DWord;
{-------------------------------------------------------------------------------

===============================================================================}
Const waitTime = 100; //en millisecondes ou sinon la value Infinite ... oups !
var
  SI: TStartupInfo;
  PI: TProcessInformation;
  Proc: THandle;
  state: DWord;
begin
  FillChar(SI, SizeOf(SI), 0);
  SI.cb := SizeOf(SI);
  SI.wShowWindow := Visibility;
  if not CreateProcess(PChar(AppPath), PChar(AppParams), Nil, Nil, False,
               Normal_Priority_Class, Nil, Nil, SI, PI) then
    raise Exception.CreateFmt('Impossible de creer le processus. Code Erreur %d',
                              [GetLastError]);
  Proc := PI.hProcess;
  CloseHandle(PI.hThread);
  State := STILL_ACTIVE + 1;
  repeat
    if WaitForSingleObject(Proc, waitTime) <> Wait_Failed then
               GetExitCodeProcess(Proc, State);
    Application.ProcessMessages;
  until State <> STILL_ACTIVE;
  CloseHandle(Proc);
  Result := state;
end;
0
Comment
Question by:SChatel
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3 Comments
 
LVL 13

Accepted Solution

by:
Epsylon earned 200 total points
ID: 6268568
Use one of these examples:



uses Excel_tlb, ActiveX, ComObj;

var
 Excel: _Application;
 AppWasRunning: boolean; // tells you if you can close Excel when you've finished
 lcid: integer;
 Unknown: IUnknown;
 Result: HResult;
 SaveChanges: Variant;
begin
 lcid := LOCALE_USER_DEFAULT;
 AppWasRunning := False;

 {$IFDEF VER120}      // Delphi 4
 Result := GetActiveObject(CLASS_Application_, nil, Unknown);
 if (Result = MK_E_UNAVAILABLE) then
   Excel := CoApplication_.Create

 {$ELSE}              // Delphi 5
 Result := GetActiveObject(CLASS_ExcelApplication, nil, Unknown);
 if (Result = MK_E_UNAVAILABLE) then
   Excel := CoExcelApplication.Create
 {$ENDIF}

 else begin
   { make sure no other error occurred during GetActiveObject }
   OleCheck(Result);
   OleCheck(Unknown.QueryInterface(_Application, Excel));
   AppWasRunning := True;
 end;
 Excel.Visible[lcid] := True;

........

 Excel := nil;
end;






uses ComObj;

var
 Excel: Variant;
 SaveChanges: OleVariant;
begin
 try
   Excel := GetActiveOleObject('Excel.Application');    
 except
   Excel := CreateOleObject('Excel.Application');    
 end;
 Excel.Visible := True;

.........

 Excel := Unassigned;
end;
0
 
LVL 13

Expert Comment

by:Epsylon
ID: 6268574
Call Excel.Quit to close Excel before Excel := nil or Excel := Unassigned.
0
 
LVL 13

Expert Comment

by:Epsylon
ID: 6269967
Check this page for Excel automation:

http://www.djpate.freeserve.co.uk/AutoExcl.htm
0

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