c++ - How to delete botched symbolic links in the registry -


i'm prototyping edits registry create symbolic link 1 area another. i've used following code:

hkey hkfs; hkey hksoftware; dword dwdisposition; lstatus result; result = regopenkeyex(hkey_local_machine, _t("software"), 0,          key_create_sub_key , &hksoftware); if (result == 0) {    result = regopenkeyex(hksoftware, _t("mykey"), reg_option_open_link,             key_write | key_create_link | key_wow64_64key, &hkfs);    if (result != error_success) {       _tprintf(_t("%d\n"), result);       result = regcreatekeyex(hksoftware, _t("mykey"), 0, null,                reg_option_create_link,                key_write | key_create_link | key_wow64_64key,                null, &hkfs, &dwdisposition);       _tprintf(_t("%d\n"), result);    }    if (result == error_success) {       //result = zwdeletekey(hkfs);       tchar target[] = _t("hkey_local_machine\\software\\wow6432node\\mykey");       result = regsetvalueex(hkfs, _t("symboliclinkvalue"), 0, reg_sz,                (const byte const *)target, sizeof(target));       if (result != error_success) {          tchar msg[256];          formatmessage(format_message_from_system, null, result, 0, msg,                        sizeof(msg) / sizeof(tchar), null);          _tprintf(_t("failed write symboliclinkvalue: %s"), msg);       }       regclosekey(hkfs);    }    else {       tchar msg[256];       formatmessage(format_message_from_system, null, result, 0, msg,                     sizeof(msg) / sizeof(tchar), null);       _putts(msg);    } } else {    tchar msg[256];    formatmessage(format_message_from_system, null, result, 0, msg,                  sizeof(msg) / sizeof(tchar), null);    _tprintf(_t("error opening software: %s"), msg); } regclosekey(hksoftware);

and have 2 problems.

  1. i cannot delete mykey values have been created under software.
  2. i access denied errors when attempting write symboliclinkvalue mykey, when running administrator.

i need cleaning registry , making code work.

i found code @ http://www.codeproject.com/articles/11973/registry-symbolic-links solved problems.

this code uses delete registry key representing symbolic link:

typedef long ntstatus;  #if !defined(_ntsystem_) #define ntsysapi     declspec_import #else #define ntsysapi #endif  ntsysapi ntstatus ntapi zwdeletekey(     in handle keyhandle     );  typedef ntsysapi ntstatus  (ntapi *zw_delete_key_proto)(handle); static long dynzwdeletekey(hkey hkey) {     long lstatus = error_success;     hmodule hntdll = loadlibraryw( l"ntdll.dll" );     if (hntdll)     {       zw_delete_key_proto lpfnzwdeletekey =  (zw_delete_key_proto)getprocaddress(hntdll, "zwdeletekey");       if (lpfnzwdeletekey)         lstatus = lpfnzwdeletekey(hkey);       else         lstatus = getlasterror();        verify(freelibrary(hntdll));     }     else         lstatus = getlasterror();      return lstatus; }

and code above had couple problems in creating link. these corrected lines make work:

result = regcreatekeyex(hksoftware, _t("mykey"), 0, null,          reg_option_create_link,          key_all_access | key_create_link | key_wow64_64key,          null, &hkfs, &dwdisposition);

...

result = regsetvalueexw(hkfs, l"symboliclinkvalue", 0, reg_link,          (const byte const *)target, lstrlen(target) * sizeof(wchar));

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