VC：利用注册表枚举函数枚举注册表（RegOpenKeyEx）

//利用注册表枚举函数枚举注册表

              HKEY whKey=NULL,h=NULL;

              char wstr[MAX_PATH];

              DWORD num=sizeof(wstr),index=0,rc1;

              rc1=::RegOpenKeyEx(HKEY_CURRENT_USER,"Printers",0,KEY_ALL_ACCESS,&whKey);

              if(rc1==ERROR_SUCCESS)

              {

                     //这里只输出一层。想全部输出则需要递归.即定义一个函数，wstr做参数。

                     while(RegEnumKeyEx(whKey,index,wstr,&num,NULL,NULL,NULL,NULL)==0)

                     {

                            //枚举键值

                            cout<<"Number of index="<<index<<endl;

                            cout<<wstr<<endl;

                            index++;

                            num=MAX_PATH;

                     }

                    

              }

              else

              {

                     cout<<"Can't Open The Key!"<<endl;

              }

              RegCloseKey(whKey);