check ob Online?

energyzer

de_Bert schrieb:

Versuche aus deiner Anwendung einfach was aus dem Internet runterzuladen. Wenn es funktioniert dann bist du online und wenn nicht dann halt nicht.

Noch besser: Versuche Seiten wie google.com oder msn.com anzupingen (Am besten in Kombination). Klassen, die dies einfach ermöglichen gibt es zu genüge im Internet.

Shlo

http://www.c-plusplus.net/forum/viewtopic.php?p=312764&highlight=#312764

Jetzt haut's dank eurer Hilfe hin.

#include "Wininet.h"
#pragma comment(lib,"wininet")

bool CmyDialog::CheckForConnection()
{
   BOOL isOnline = false;

   if (InternetCheckConnection("http://www.google.de",FLAG_ICC_FORCE_CONNECTION,0))
   {
      isOnline = true;
   } 
      return(isOnline);
}

Gruß Matten

takeiteasy

Hi,

ich weiß das Thema iss eigentlich schon beendet, aber ich wollt einfach noch kurz die kürzeste Version vorstellen

#include "Wininet.h" 
#pragma comment(lib,"wininet") 

bool CmyDialog::CheckForConnection() 
{ 
   return InternetGetConnectedState(NULL,NULL);
}

mfg

phlox81

Der Quellcode müsste auch funktionieren...

http://mitglied.lycos.de/Devil_81/CPP/online.htm

Devil

Den Code hatte ich auch probiert! bekomme aber immer '0' zurück!

Trotzdem Danke an alle.

dehein2

der Beitrag hier ist zwar schon sehr alt, aber ich wollte das auch mal probieren. Ich benutze jetzt Visual C++ .Net.. ich habe den Code so kopiert :

#include "Wininet.h"
#pragma comment(lib,"wininet")

bool CmyDialog::CheckForConnection()
{
   return InternetGetConnectedState(NULL,NULL);
}

und bekomme dann eine unmenge an Fehlermeldungen:

------ Build started: Project: inet_test, Configuration: Debug Win32 ------

Compiling...
inet_test.cpp
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(56) : error C2146: syntax error : missing ';' before identifier 'HINTERNET'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(56) : error C2501: 'HINTERNET' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(57) : error C2143: syntax error : missing ';' before ''
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(57) : error C2378: 'HINTERNET' : redefinition; symbol cannot be overloaded with a typedef
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(56) : see declaration of 'HINTERNET'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(57) : error C2501: 'LPHINTERNET' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(59) : error C2146: syntax error : missing ';' before identifier 'INTERNET_PORT'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(59) : error C2501: 'INTERNET_PORT' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(60) : error C2143: syntax error : missing ';' before ''
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(60) : error C2378: 'INTERNET_PORT' : redefinition; symbol cannot be overloaded with a typedef
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(59) : see declaration of 'INTERNET_PORT'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(60) : error C2501: 'LPINTERNET_PORT' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(297) : error C2146: syntax error : missing ';' before identifier 'dwResult'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(297) : error C2501: '__unnamed::DWORD_PTR' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(297) : error C2501: '__unnamed::dwResult' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(303) : error C2146: syntax error : missing ';' before identifier 'dwError'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(303) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(303) : error C2501: '__unnamed::dwError' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(312) : error C2146: syntax error : missing ';' before identifier 'Socket'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(312) : error C2501: '__unnamed::DWORD_PTR' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(312) : error C2501: '__unnamed::Socket' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(313) : error C2146: syntax error : missing ';' before identifier 'SourcePort'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(313) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(313) : error C2501: '__unnamed::SourcePort' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(314) : error C2146: syntax error : missing ';' before identifier 'DestPort'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(314) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(314) : error C2501: '__unnamed::DestPort' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(315) : error C2146: syntax error : missing ';' before identifier 'Flags'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(315) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(315) : error C2501: '__unnamed::Flags' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(339) : error C2146: syntax error : missing ';' before identifier 'dwAccessType'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(339) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(339) : error C2501: '__unnamed::dwAccessType' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(345) : error C2146: syntax error : missing ';' before identifier 'lpszProxy'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(345) : error C2501: '__unnamed::LPCTSTR' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(345) : error C2501: '__unnamed::lpszProxy' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(351) : error C2146: syntax error : missing ';' before identifier 'lpszProxyBypass'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(351) : error C2501: '__unnamed::LPCTSTR' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(351) : error C2501: '__unnamed::lpszProxyBypass' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(363) : error C2146: syntax error : missing ';' before identifier 'dwOption'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(363) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(363) : error C2501: '__unnamed::dwOption' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(365) : error C2146: syntax error : missing ';' before identifier 'dwValue'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(365) : error C2501: '__unnamed::__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(365) : error C2501: '__unnamed::__unnamed::dwValue' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(366) : error C2146: syntax error : missing ';' before identifier 'pszValue'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(366) : error C2501: '__unnamed::__unnamed::LPSTR' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(366) : error C2501: '__unnamed::__unnamed::pszValue' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(367) : error C2146: syntax error : missing ';' before identifier 'ftValue'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(367) : error C2501: '__unnamed::__unnamed::FILETIME' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(367) : error C2501: '__unnamed::__unnamed::ftValue' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(371) : error C2146: syntax error : missing ';' before identifier 'dwOption'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(371) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(371) : error C2501: '__unnamed::dwOption' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(373) : error C2146: syntax error : missing ';' before identifier 'dwValue'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(373) : error C2501: '__unnamed::__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(373) : error C2501: '__unnamed::__unnamed::dwValue' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(374) : error C2146: syntax error : missing ';' before identifier 'pszValue'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(374) : error C2501: '__unnamed::__unnamed::LPWSTR' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(374) : error C2501: '__unnamed::__unnamed::pszValue' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(375) : error C2146: syntax error : missing ';' before identifier 'ftValue'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(375) : error C2501: '__unnamed::__unnamed::FILETIME' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(375) : error C2501: '__unnamed::__unnamed::ftValue' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(387) : error C2146: syntax error : missing ';' before identifier 'dwSize'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(387) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(387) : error C2501: '__unnamed::dwSize' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(388) : error C2146: syntax error : missing ';' before identifier 'pszConnection'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(388) : error C2501: '__unnamed::LPSTR' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(388) : error C2501: '__unnamed::pszConnection' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(389) : error C2146: syntax error : missing ';' before identifier 'dwOptionCount'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(389) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(389) : error C2501: '__unnamed::dwOptionCount' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(390) : error C2146: syntax error : missing ';' before identifier 'dwOptionError'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(390) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(390) : error C2501: '__unnamed::dwOptionError' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(395) : error C2146: syntax error : missing ';' before identifier 'dwSize'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(395) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(395) : error C2501: '__unnamed::dwSize' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(396) : error C2146: syntax error : missing ';' before identifier 'pszConnection'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(396) : error C2501: '__unnamed::LPWSTR' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(396) : error C2501: '__unnamed::pszConnection' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(397) : error C2146: syntax error : missing ';' before identifier 'dwOptionCount'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(397) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(397) : error C2501: '__unnamed::dwOptionCount' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(398) : error C2146: syntax error : missing ';' before identifier 'dwOptionError'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(398) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(398) : error C2501: '__unnamed::dwOptionError' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(448) : error C2146: syntax error : missing ';' before identifier 'dwMajorVersion'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(448) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(448) : error C2501: '__unnamed::dwMajorVersion' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(449) : error C2146: syntax error : missing ';' before identifier 'dwMinorVersion'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(449) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(449) : error C2501: '__unnamed::dwMinorVersion' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(457) : error C2146: syntax error : missing ';' before identifier 'dwMajorVersion'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(457) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(457) : error C2501: '__unnamed::dwMajorVersion' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(458) : error C2146: syntax error : missing ';' before identifier 'dwMinorVersion'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(458) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(458) : error C2501: '__unnamed::dwMinorVersion' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(472) : error C2146: syntax error : missing ';' before identifier 'dwConnectedState'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(472) : error C2501: '__unnamed::DWORD' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(472) : error C2501: '__unnamed::dwConnectedState' : missing storage-class or type specifiers
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(479) : error C2146: syntax error : missing ';' before identifier 'dwFlags'
c:\Programme\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinInet.h(479) : fatal error C1003: error count exceeds 100; stopping compilation

Build log was saved at "file://d:\Visual Studio Projects\inet_test\Debug\BuildLog.htm"
inet_test - 102 error(s), 0 warning(s)

das asgt mir alles garnichts und der Fehler scheint ja auch in der wininet.h zu liegen...

danke

phlox81

Such mal in der MSDN nach den Fehlernummern...

Das gleiche Problem hatte ich auch wie Dahein!
Mir ist aufgefallen das dieses Problem erst nach einem SDK-Update
entstanden ist...

Lösung ?

dehein2

das hört sich schlecht an...

dehein2

wie mache ich das denn dann? wenn ich das oben richtig gesehen ahbe berughen die anderen Lösungen auch auf der wininet.h