Title: Check if computer is connected to the Internet
Question: Are we Connected to the Internet?
Answer:
function FuncAvail(VLibraryname, VFunctionname: string; var VPointer: pointer): boolean;
//
// this function check if VFunctionname exists in VLibraryname
//
var
Vlib: tHandle;
begin
Result := false;
if LoadLibrary(PChar(VLibraryname)) = 0 then
exit;
Vlib := GetModuleHandle(PChar(VLibraryname));
if Vlib 0 then
begin
VPointer := GetProcAddress(Vlib, PChar(VFunctionname));
if VPointer NIL then
Result := true;
end;
end;
Code Button1 on a Form1:
procedure TForm1.Button1Click(Sender: TObject);
//
// Call shell32.dll for highter Win98
// else call url.dll
//
var
InetIsOffline : function(dwFlags: DWORD):BOOL; stdcall;
begin
if FuncAvail('url.dll', 'InetIsOffline', @InetIsOffline) then
if InetIsOffLine(0) then
ShowMessage('Not connected')
else
ShowMessage('Connected!');
end;