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////////////////////////////////////////////////////////////////////////////////
// All code below is exclusively owned by author of Chess4Net - Pavel Perminov
// (packpaul@mail.ru, packpaul1@gmail.com).
// Any changes, modifications, borrowing and adaptation are a subject for
// explicit permition from the owner.
unit URLVersionQueryUnit;
interface
uses
Classes;
type
TApplicationID = (aidAnalyzer = 1, aidSkype = 2);
TOperatingSystemID = (osidWindows = 1, osidLinux = 2);
TURLVersionQuery = class;
TQueryReadyEvent = procedure(Sender: TURLVersionQuery) of object;
TURLVersionQuery = class(TDataModule)
private
m_iLastVersion: integer;
m_wstrInfo: WideString;
FQueryReadyEvent: TQueryReadyEvent;
procedure FDoQueryReady;
function FQuery(const strURL: string): string;
function FGetURL(ApplicationID: TApplicationID; iVersion: integer;
OperatingSystemID: TOperatingSystemID): string;
procedure FParseResponse(const strResponse: string);
public
constructor Create; reintroduce;
procedure Query(ApplicationID: TApplicationID; iVersion: integer;
OperatingSystemID: TOperatingSystemID);
property LastVersion: integer read m_iLastVersion;
property Info: WideString read m_wstrInfo;
property OnQueryReady: TQueryReadyEvent read FQueryReadyEvent write FQueryReadyEvent;
end;
implementation
{$R *.dfm}
uses
Forms, SysUtils, StrUtils,
//
XIE;
type
TQueryThread = class(TThread)
private
m_URLVersionQuery: TURLVersionQuery;
m_strURL: string;
m_strResponse: string;
procedure FNotifyOnResponse;
protected
procedure Execute; override;
public
constructor Create(AURLVersionQuery: TURLVersionQuery; const strURL: string);
end;
////////////////////////////////////////////////////////////////////////////////
// TURLVersionQuery
constructor TURLVersionQuery.Create;
begin
inherited Create(Application);
end;
procedure TURLVersionQuery.FDoQueryReady;
begin
if (Assigned(FQueryReadyEvent)) then
FQueryReadyEvent(self);
end;
procedure TURLVersionQuery.Query(ApplicationID: TApplicationID; iVersion: integer;
OperatingSystemID: TOperatingSystemID);
begin
TQueryThread.Create(self, FGetURL(ApplicationID, iVersion, OperatingSystemID));
end;
function TURLVersionQuery.FQuery(const strURL: string): string;
begin
with TIEWrapper.Create do
try
Result := OpenRequest(strURL);
finally
Free;
end;
end;
function TURLVersionQuery.FGetURL(ApplicationID: TApplicationID; iVersion: integer;
OperatingSystemID: TOperatingSystemID): string;
begin
Result := Format('http://chess4net.ru/stat.php?app=%d&ver=%d&os=%d',
[Ord(ApplicationID), iVersion, Ord(OperatingSystemID)]);
end;
procedure TURLVersionQuery.FParseResponse(const strResponse: string);
procedure NSplit(const str: string; out strlList: TStringList);
var
iPosPrev, iPosNext: integer;
strSub: string;
begin
strlList := TStringList.Create;
strSub := '';
iPosPrev := 1;
while (iPosPrev <= Length(str)) do
begin
iPosNext := iPosPrev;
iPosNext := PosEx(';', str, iPosNext);
if (iPosNext = 0) then
iPosNext := MaxInt - 1;
strSub := strSub + Copy(str, iPosPrev, iPosNext - iPosPrev);
if ((iPosNext < Length(str)) and (str[iPosNext + 1] = ';')) then
begin
strSub := strSub + ';';
iPosPrev := iPosNext + 2;
continue;
end;
strlList.Append(strSub);
strSub := '';
iPosPrev := iPosNext + 1;
end;
end;
var
strl: TStringList;
begin // .FParseResponse
NSplit(strResponse, strl);
try
m_iLastVersion := StrToIntDef(strl.Values['Last version'], 0);
m_wstrInfo := strl.Values['Info'];
finally
strl.Free;
end;
end;
////////////////////////////////////////////////////////////////////////////////
// TQueryThread
constructor TQueryThread.Create(AURLVersionQuery: TURLVersionQuery; const strURL: string);
begin
m_URLVersionQuery := AURLVersionQuery;
m_strURL := strURL;
inherited Create(TRUE);
FreeOnTerminate := TRUE;
Resume;
end;
procedure TQueryThread.Execute;
begin
{$IFNDEF TESTING}
m_strResponse := m_URLVersionQuery.FQuery(m_strURL);
{$ELSE}
m_strResponse := 'Last version=201102;Info=Version 2011.2 is available'#10'TEST> You can download it from http://chess4net.ru <TEST';
{$ENDIF}
Synchronize(FNotifyOnResponse);
end;
procedure TQueryThread.FNotifyOnResponse;
begin
m_URLVersionQuery.FParseResponse(m_strResponse);
m_URLVersionQuery.FDoQueryReady;
end;
end.
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