I have never asked questions in any community as I always solved problems by myself or could find them online. But with this one I came to dead end and need Help! To make it very clear – I converted a simple app, found elsewhere to make it use a Tthread object. The idea is simple – the app checks online using webservice, through THTTPRIO component, weather and put the results in Memo1 lines.
Clicking on Button1 we get it done in standard way – using THTTPRIO put on the Form1 (it's called here htt as in original app) and using main and only thread.
procedure TForm1.Button1Click(Sender: TObject);
var
wf:WeatherForecasts;
res:ArrayOfWeatherData;
i:integer;
begin
wf:=(htt as WeatherForecastSoap).GetWeatherByPlaceName(edit1.Text);
if wf.PlaceName<> '' then
res:=wf.Details;
memo1.Lines.Add('The min and max temps in Fahrenheit is:');
memo1.Lines.Add(' ');
for i:= 0 to high(res) do
begin
memo1.Lines.Add(res[i].Day+' - '+ ' Max Temp. Fahr: '+res[i].MaxTemperatureF+' - '+'Min Temp Fahr: '+res[i].MinTemperatureF);
end
end;
Clicking on Button2 – we use class TThread
procedure TForm1.Button2Click(Sender: TObject);
var WFThread:WeatherThread;
begin
WFThread := WeatherThread.Create (True);
WFThread.FreeOnTerminate := True;
WFThread.Place := Edit1.Text;
WFThread.Resume;
end;
In Execute procedure in WeatherThread1 unit I put this code:
procedure WeatherThread.Execute;
begin
{ Place thread code here }
GetForecast;
Synchronize (ShowWeather);
end;
...and the GetForecast code:
procedure WeatherThread.GetForecast;
var
HTTPRIO: THTTPRIO;
wf:WeatherForecasts;
res:ArrayOfWeatherData;
i:integer;
begin
HTTPRIO := THTTPRIO.Create(nil);
HTTPRIO.URL := 'http://www.webservicex.net/WeatherForecast.asmx';
HTTPRIO.WSDLLocation := 'http://www.webservicex.net/WeatherForecast.asmx?WSDL';
HTTPRIO.Service := 'WeatherForecast';
HTTPRIO.Port := 'WeatherForecastSoap';
wf:=(HTTPRIO as WeatherForecastSoap).GetWeatherByPlaceName(Place);
if Lines=nil then Lines:=TStringList.Create;
if wf.PlaceName<> '' then
res:=wf.Details;
Lines.Clear;
for i:= 0 to high(res) do
begin
Lines.Add(res[i].Day+' - '+ ' Max Temp. Fahr: '+res[i].MaxTemperatureF+' - '+'Min Temp Fahr: '+res[i].MinTemperatureF);
end;
end;
Procedure ShowWeather shows results in Form1.Memo1. And now there is a problem: In main thread, clicking Button1, everything works fine. But of course when HTTPRIO component communicates – it freezes the form.
With Button2 I put the code in separate thread but it does NOT WANT TO WORK! Something strange happens. When I start application – and click Button2, there is an error when using HTTPRIO component. But it works for a while when I click FIRST Button1 and AFTER THAT Button2 (but it works for a while, 5-7 clicks only). I suppose I do something wrong but cannot figure out where the problem is and how to solve it. It looks like the code in threaded unit is not thread-safe, but it should be. Please help how to make HTTPRIO work in a thread!!!
You can find zipped full code here.