Search results for 'InetIsOffline'. 1 post(s) found.
- 2007/09/18 Are we connected to the Internet?
Here's how to check whether you are connected to the Internet
procedure TForm1.Button1Click(Sender: TObject) ;
function FuncAvail(_dllname, _funcname: string; var _p: pointer): boolean;
{return True if _funcname exists in _dllname}
var _lib: tHandle;
begin
Result := false;
if LoadLibrary(PChar(_dllname)) = 0 then exit;
_lib := GetModuleHandle(PChar(_dllname)) ;
if _lib <> 0 then begin
_p := GetProcAddress(_lib, PChar(_funcname)) ;
if _p <> NIL then Result := true;
end;
end;
{
Call SHELL32.DLL for Win < Win98
otherwise call URL.DLL
}
{button code:}
var
InetIsOffline : function(dwFlags: DWORD):
BOOL; stdcall;
begin
if FuncAvail('URL.DLL', 'InetIsOffline',
@InetIsOffline) then
if InetIsOffline(0) = true
then ShowMessage('Not connected')
else ShowMessage('Connected!') ;
end;
function FuncAvail(_dllname, _funcname: string; var _p: pointer): boolean;
{return True if _funcname exists in _dllname}
var _lib: tHandle;
begin
Result := false;
if LoadLibrary(PChar(_dllname)) = 0 then exit;
_lib := GetModuleHandle(PChar(_dllname)) ;
if _lib <> 0 then begin
_p := GetProcAddress(_lib, PChar(_funcname)) ;
if _p <> NIL then Result := true;
end;
end;
{
Call SHELL32.DLL for Win < Win98
otherwise call URL.DLL
}
{button code:}
var
InetIsOffline : function(dwFlags: DWORD):
BOOL; stdcall;
begin
if FuncAvail('URL.DLL', 'InetIsOffline',
@InetIsOffline) then
if InetIsOffline(0) = true
then ShowMessage('Not connected')
else ShowMessage('Connected!') ;
end;
Another posts included in "Delphi"
| Download a file from the Internet with progress indicator (0) | 2007/09/18 |
| Extracting the domain (host) name from an e-mail address (0) | 2007/09/18 |
| How to get get IE favorites (0) | 2007/09/18 |
| Rotate Bitmap (any angle, any center of rotation) (0) | 2007/09/11 |
| TImage.Bitmap fade out (0) | 2007/09/11 |
| TDesktopCanvas - draw on Windows Desktop (0) | 2007/09/11 |
| TColor to HTML color (0) | 2007/09/11 |
| Show *any* graphics as Glyph on a SpeedButton (0) | 2007/09/11 |
Delphi Internet,
Delphi Intranet,
Delphi Networking,
GetModuleHandle,
GetProcAddress,
InetIsOffline,
LoadLibrary,
SHELL32.DLL,
URL.DLL
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