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// Upgraded to Delphi 2009: Sebastian Zierer
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(* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is TurboPower SysTools
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*
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* The Initial Developer of the Original Code is
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* TurboPower Software
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*
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* Portions created by the Initial Developer are Copyright (C) 1996-2002
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* ***** END LICENSE BLOCK ***** *)
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{*********************************************************}
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{* SysTools: StFirst.pas 4.04 *}
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{*********************************************************}
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{* SysTools: limit instance routines *}
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{*********************************************************}
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{$I StDefine.inc}
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unit StFirst;
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interface
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uses
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Windows, Messages, Forms, SysUtils, Dialogs,
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StBase;
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function IsFirstInstance: Boolean;
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{- check if previous instance is running}
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procedure ActivateFirst(AString : PChar);
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{- Activate previous instance, passing a string}
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procedure ActivateFirstCommandLine;
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{- Activate previous instance, passing the command line}
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implementation
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const
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MAX_CMDLEN = 1024;
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var
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CmdLine : array[0..MAX_CMDLEN] of char;
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var
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FirstInstance : Boolean;
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InstanceMutex : THandle;
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{limit instances routines}
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function IsFirstInstance : Boolean;
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begin
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Result := FirstInstance;
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end;
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procedure ActivateFirstCommandLine;
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var
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S : String;
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I : Longint;
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begin
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S := '';
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for I := 0 to ParamCount-1 do
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S := S + ParamStr(I) + ' ';
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S := S + ParamStr(ParamCount);
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StrPCopy(CmdLine, Copy(S, 1, MAX_CMDLEN));
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ActivateFirst(CmdLine);
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end;
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procedure ActivateFirst(AString : PChar);
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var
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ClassBuf,
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WindowBuf : array [0..255] of Char;
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Wnd,
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TopWnd : hWnd;
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ThreadID : DWord;
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CDS : TCopyDataStruct;
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begin
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if (strlen(AString) > 0) then begin
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CDS.dwData := WMCOPYID;
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CDS.cbData := StrLen(AString) + 1;
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CDS.lpData := AString;
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end else begin
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CDS.dwData := WMCOPYID;
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CDS.cbData := 0;
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CDS.lpData := nil;
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end;
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if IsFirstInstance then begin
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if IsIconic(Application.Handle) then
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Application.Restore
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else
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Application.BringToFront;
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end else begin
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GetClassName(Application.Handle, ClassBuf, Length(ClassBuf));
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GetWindowText(Application.Handle, WindowBuf, Length(WindowBuf));
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Wnd := FindWindow(ClassBuf, WindowBuf);
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if (Wnd <> 0) then begin
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GetWindowThreadProcessId(Wnd, @ThreadID);
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if (ThreadID = GetCurrentProcessId) then begin
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Wnd := FindWindowEx(0, Wnd, ClassBuf, WindowBuf);
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if (Wnd <> 0) then begin
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if IsIconic(Wnd) then
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ShowWindow(Wnd, SW_RESTORE);
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SetForegroundWindow(Wnd);
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TopWnd := GetLastActivePopup(Wnd);
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if (TopWnd <> 0) and (TopWnd <> Wnd) and
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IsWindowVisible(TopWnd) and IsWindowEnabled(TopWnd) then begin
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BringWindowToTop(TopWnd);
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SendMessage(TopWnd, WM_COPYDATA, 0, lparam(@CDS));
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end else begin
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BringWindowToTop(Wnd);
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SendMessage(Wnd, WM_COPYDATA, 0, lparam(@CDS));
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end;
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end;
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end;
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end;
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end;
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end;
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function GetMutexName : string;
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var
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WindowBuf : array [0..512] of Char;
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begin
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GetWindowText(Application.Handle, WindowBuf, Length(WindowBuf));
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Result := 'PREVINST:' + WindowBuf;
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end;
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initialization
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InstanceMutex := CreateMutex(nil, True, PChar(GetMutexName));
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if (InstanceMutex <> 0) and (GetLastError = 0) then
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FirstInstance := True
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else
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FirstInstance := False;
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finalization
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if (InstanceMutex <> 0) then
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CloseHandle(InstanceMutex);
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end.
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