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Determine if user has administrator rights (windows)

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  • S Offline
    S Offline
    szh1
    wrote on last edited by
    #14

    My application requires registry editing, and in main() I want to make sure the user has the rights to edit the registry so I don't get errors when I try to do it.

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    • D Offline
      D Offline
      DenisKormalev
      wrote on last edited by
      #15

      < offtopic >
      Oh, such a lot of tags for only twelve comments.
      < /offtopic >

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      • I Offline
        I Offline
        ixSci
        wrote on last edited by
        #16

        Ok, presume you want to check if the user has a right to change some registry entry. You should:
        @
        if(RegOpenKeyEx(XXX, XXX, XXX, KEY_WRITE, XXX) == ERROR_ACCESS_DENIED)
        //user has no right to write in this registry key
        @
        It's just a pseudo-code but I think you'll grasp the idea

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        • S Offline
          S Offline
          szh1
          wrote on last edited by
          #17

          Thanks! I think I'll try that. But I am still wondering why the MSDN sample code didn't work.

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          • I Offline
            I Offline
            ixSci
            wrote on last edited by
            #18

            I don't know, may be some troubles with Windows SDK? Check the headers which you had included whether they have that function declaration.

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            • S Offline
              S Offline
              szh1
              wrote on last edited by
              #19

              It says I need to include Windows.h, and I did. I also tried including Winbase.h. Still doesn't work.

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              • S Offline
                S Offline
                szh1
                wrote on last edited by
                #20

                [quote author="ixSci" date="1287770694"]Ok, presume you want to check if the user has a right to change some registry entry. You should:
                @
                if(RegOpenKeyEx(XXX, XXX, XXX, KEY_WRITE, XXX) == ERROR_ACCESS_DENIED)
                //user has no right to write in this registry key
                @
                It's just a pseudo-code but I think you'll grasp the idea[/quote]

                You can actually use QSettings to edit the registry.

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                • S Offline
                  S Offline
                  szh1
                  wrote on last edited by
                  #21

                  I just got it working! Here's my code:
                  @
                  // get ready to attempt to edit the registry
                  QSettings adminTest("HKEY_LOCAL_MACHINE", QSettings::NativeFormat);
                  // get the current value and put it back
                  QVariant currentValue = adminTest.value("(Default)");
                  adminTest.setValue("(Default)", currentValue);
                  adminTest.sync();
                  // see if there was an error
                  if (adminTest.status() == QSettings::AccessError)
                  return false;
                  else
                  return true;
                  @

                  Thanks a lot for the help everyone! I definitely learned a lot from this.

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                  • S Offline
                    S Offline
                    szh1
                    wrote on last edited by
                    #22

                    By the way, I checked, and the above code puts in another "(Default)" Value Name with a Value Data of "@Invalid()". I am not sure if this is good or bad, but it hasn't causes me any problems. You do it at your own risk.

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                    • terma.abaT Offline
                      terma.abaT Offline
                      terma.aba
                      wrote on last edited by
                      #23

                      It is a valid question because: QSettings::Scope allows writes at QSettings::SystemScope - but only if you have sufficient rights (in the general sense of the English word rather than the Microsoft one).

                      The remaining posts seems to be Win API based, so I guess the answer is "no"?

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