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"IsDestinationReachable" on Win9x/Win ME

Posted on 2002-06-21
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Last Modified: 2013-12-04
Has anybody an idea why "IsDestinationReachable" doesn't work on Win9x/Win ME? It just returns FALSE.

MSIE 5.0 is installed on those machines and I'm able to ping the server I pass to "IsDestinationReachable". Also "GetLastError" returns ERROR_SUCCESS.
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Question by:searching
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Author Comment

by:searching
ID: 7098311
development environment: an MFC project in MSVC 6.0 SP5/ Win2000 SP2 / Platform SDK November 2001 Edition / MSIE 5.0
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jhance earned 200 total points
ID: 7098670
Show your code.  I think you are making a programming error.  I tested this on Win2000, XP, and WinME and it works as expected on all platforms.

My code:

int main(int argc, char* argv[])
{
     QOCINFO mQOC;
     mQOC.dwSize = sizeof(QOCINFO);

     printf("IsDestinationReachable() Test\n\n");

     if(argc < 2){
          printf("usage: ReachableTest <hostname_or_ip>\n");
          return -1;
     }

     if(IsDestinationReachable(argv[1], &mQOC)){
          // Returned TRUE
          printf("IsDestinationReachable() SUCCEEDED.\n");
          printf("\tdwFlags\t\t: 0x%08X\n", mQOC.dwFlags);
          printf("\tdwInSpeed\t: %d\n", mQOC.dwInSpeed);
          printf("\tdwOutSpeed\t: %d\n", mQOC.dwOutSpeed);

     }
     else{
          // Returned FALSE - ERROR
          printf("IsDestinationReachable() failed.  Error is: %d\n", GetLastError());
          return -1;
     }

     return 0;
}

On all Windows platforms I get:

C:\ReachableTest\Release>ReachableTest www.experts-exchange.com

IsDestinationReachable() Test

IsDestinationReachable() SUCCEEDED.
        dwFlags         : 0x00000001
        dwInSpeed       : 100000000
        dwOutSpeed      : 100000000
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Author Comment

by:searching
ID: 7103182
Tnx for pointing this out. I have tested a few things and it seems that "IsDestinationReachable" behaves differently on Win9x <-> Win2000.
Win2000: "http://www.experts-exchange.com" OK
         "www.experts-exchange.com" OK
Win9x: "http://www.experts-exchange.com" NOT OK
       "www.experts-exchange.com" OK

I've also tested "InternetCheckConnection". Do you have any experiences with this function? It crashes or returns FALSE on platforms with WinInet.dll 5.00.26xx.xx or lower.
Any suggestions?
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