How to check the class id is registered or not?

Question

Hi i am checking the GUID of SqlClass which is in my Test.dll But it does not give success it failed with value... Whatis wrong in this code.

#include <windows.h>
#include <iostream>
using namespace std; 

int main() {
  HKEY hk;

  long n = RegOpenKeyEx(HKEY_CLASSES_ROOT,TEXT("\\CLSID\\SqlClass"),
                  0,KEY_QUERY_VALUE, &hk );"
  if ( n == ERROR_SUCCESS ) {
    cout << "OK" << endl;
  }
  else {
    cout << "Failed with value " << n << endl;
  }
}

I tried like this also RegOpenKeyEx(HKEY_CLASSES_ROOT,TEXT("\CLSID\46A951AC-C2D9-48e0-97BE-91F3C9E7B065"), 0,KEY_QUERY_VALUE, &hk )

THIS CODE WORKS FINE

    #include < windows.h >
    # include < iostream >
    using namespace std; 

   int main() {
               HKEY hk;

               long n = RegOpenKeyEx(HKEY_CLASSES_ROOT,
           TEXT("\\CLSID\\{46A951AC-C2D9-48e0-97BE-91F3C9E7B065}"),
              0,KEY_QUERY_VALUE, &hk );"
           if ( n == ERROR_SUCCESS ) {
               cout << "OK" << endl;
             }
            else {
                 cout << "Failed with value " << n << endl;
                }
         }

Answer 1

I've never seen anything other than a GUID under CLSID, so the key probably doesn't exist. Look in that node under regedit to see what I mean.

What was the failure code, n? You can look this up in two ways

1. Put the number into the "Error Lookup" tool in Visual Studio's Tools menu.

2. Call FormatMessage on n, which gives you the text associated with that error.