OnHostUnreachable event

Applies to

WinHTTP component.

Declaration

property OnHostUnrachable: TNotifyEvent;

Description

The OnHostUnreachable event occurs if the WinHTTP can not connect to the remote host specified in the URL property. Possible reasons of this problem is:

1.

User currently not connected to the Internet;

2.

Hostname is unknown (check spelling of domain name);

3.

Remote server is down (disconnected from Internet).

Remarks

1.

The OnHostUnreachable event occurs also when user currently working offline (even if connection to the Internet present) and would like to post some data, specified in the POSTData property, to the CGI program. Posting to the CGI programs requires active Internet connection.

Example
Delphi:

procedure TForm1.WinHTTP1HostUnreachable(Sender: TObject);

begin

Application.MessageBox(PChar('Host http://' + WinHTTP1.HostName + ' is unreachable.'#13'Please check your Internet connection and'#13'retry your HTTP request again later.'),

PChar(Application.Title),

MB_OK or MB_ICONSTOP);

end;

C++ Builder:

void __fastcall TForm1::WinHTTP1HostUnreachable(TObject *Sender)

{

AnsiString Msg =

"Host http://" + WinHTTP1->HostName + " is unreachable.\n\n"

"Please check your Internet connection and\n"

"try to upgrade this software again later.";

Application->MessageBox(Msg.c_str(),

Application->Title.c_str(),

MB_OK | MB_ICONSTOP);

}

See also

URL property; OnAnyError event.

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