Inno Setup: Marquee style progress bar for lengthy synchronous operation in C# DLL -

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i create setup program using inno setup. have code c# , wizard page runs it. want see "progressbar" (style marquee) when code c# works long time. want undectend code c# working or hanging. how create "progressbar" (style marquee) in inno setup code c#. thank idea.

example progressbar:

enter image description here

some code:

[files] source: "getdatabases.dll"; flags: dontcopy  [code]  function serverofdatabases(   scriptname, server, user, password,namedb: string; out strout: widestring): integer;   external 'serverofdatabases@files:getdatabases.dll stdcall';  var   serverdetailspage: tinputquerywizardpage;  function calldb(scriptname, server, user, password, namedb: string):string; var   retval: integer;   str: widestring; begin     retval := serverofdatabases(scriptname, server, user, password, namedb, str);    result:= str;  end;  procedure initializewizard; var  ... begin   serverdetailspage := createinputquerypage(wpwelcome, '', '', '...');   serverdetailspage.add('server...', false);   ...   serverdetailspage.values[0] := ''; end;  function nextbuttonclick(curpageid: integer): boolean; var   datadases: string; ... begin   ...     if curpageid = serverdetailspage.id   begin     ...     datadases := '';     scriptname := 'listdb';     datadases := calldb(       scriptname, serverdetailspage.values[0], serverdetailspage.values[2],       serverdetailspage.values[3], '');      ...   end; end;

this not easy. calling synchronous function blocks gui thread. cannot animate progress bar.

you have run lengthy task on different thread. seems dll, can modify offer asynchronous api. like:

private static task _task = null; private static int _outcome;  [dllexport(callingconvention = callingconvention.stdcall)] public static void startsomething() {     // starts operation on different thread     _task = new task(() => { something(); });     _task.start(); }  // operation run on different thread private static void something() {     // lengthy operation     thread.sleep(10000);     // remember results     _outcome = 123; }  [dllexport(callingconvention = callingconvention.stdcall)] public static bool hassomethingcompleted(out int outcome) {     // check if operation has completed     bool result = _task.iscompleted;     // , collect results     outcome = _outcome;     return result; }

and can use inno setup like:

procedure initializewizard(); begin   serverdetailspage := createinputquerypage(wpwelcome, '', '', '...'); end;  procedure calldll; var   progresspage: toutputprogresswizardpage;   outcome: integer; begin   startsomething;    progresspage := createoutputprogresspage('calling dll', '');   progresspage.show;   try     progresspage.setprogress(0, 100);     progresspage.progressbar.style := npbstmarquee;     { wait finish }     while not hassomethingcompleted(outcome)     begin       { , pump windows message queue animate progress bar }       progresspage.setprogress(0, 100);       sleep(50);     end;        progresspage.hide;     progresspage.free;   end;    msgbox(format(     'something has finished , outcome %d', [outcome]), mbinformation, mb_ok); end;  function nextbuttonclick(curpageid: integer): boolean; begin   if curpageid = serverdetailspage.id   begin     calldll;   end;   result := true; end;

enter image description here

for similar question see:
how delay without freezing - inno setup





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