How to read a REG_BINARY value from registry where installations of 32bit applications are found, but on a 64bit OS using C# -

i want value of particular node in registry using c# on win7 64bit machine:

this value resides in registry installations of 32bit applications store information. problem facing not reaching node returning meaningful value array (string or int).

the code using shown below , adapted

http://social.msdn.microsoft.com/forums/vstudio/en-us/378491d6-23a3-4ae7-a702-c52c5abb0e8d/access-to-both-32-and-64-bit-registry-using-c-and-regmultisz?forum=csharpgeneral

and

http://www.rhyous.com/2011/01/24/how-read-the-64-bit-registry-from-a-32-bit-application-or-vice-versa/

so listing this:

public static uintptr hkey_local_machine = new uintptr(0x80000002u);  [dllimport("advapi32.dll")] public static extern int regqueryvalueex(int hkey, string lpvaluename, int lpreserved, ref uint lptype, byte[] lpdata, ref uint lpcbdata);  public enum regsam {     queryvalue = 0x0001,     setvalue = 0x0002,     createsubkey = 0x0004,     enumeratesubkeys = 0x0008,     notify = 0x0010,     createlink = 0x0020,     wow64_32key = 0x0200,     wow64_64key = 0x0100,     wow64_res = 0x0300,     read = 0x00020019,     write = 0x00020006,     execute = 0x00020019,     allaccess = 0x000f003f }  string path = @"software\microsoft\windows nt\currentversion";  registrykey rktest = registry.localmachine.opensubkey(path); try {        int hkey = 0;     uint lresult = regopenkeyex(hkey_local_machine, path, 0, (int)regsam.queryvalue | (int)regsam.wow64_32key, out hkey);     if (0 != lresult) hkey = 0;     else     {         uint lptype = 0;         uint lpcbdata = 1024;         byte[] buffer = new byte[1024];         regqueryvalueex(hkey, "digitalproductid", 0, ref lptype, buffer, ref lpcbdata);         ... @ point buffer returns empty.     } } catch (exception exc) { }; 

but when execute buffer empty.

the code have provided here can reach particular location registry shown in top image , read normal string values if replace byte[] stringbuilder class, provided value in registry of type reg_sz. can if of type reg_binary?

could point out me how can achieve this?

ps:

just show have been working on similar issue few days have converted reg_binary value readable array of integers registry using code snippet below, if value under wow6432 node.

byte[] bytes = (byte[])rktest.getvalue("digitalproductid"); string s = convert.tobase64string(bytes); list<int> int_array = new list<int>(); int temp_int = 0, = 0; (i = 0; < bytes.length; i++) { temp_int = bytes[i]; int_array.add(temp_int); } 

the problem want solve here area in registry 32bit applications stored information in reg_binary type.

thank you.

solution:

apparently 2nd link provided had needed @ last example shown on page. adapt solution in code had add method getregkey64asbytearray() this:

static public byte[] getregkey64asbytearray(uintptr inhive, string inkeyname, regsam in32or64key, string inpropertyname) {     int hkey = 0;     try {         uint lresult = regopenkeyex(inhive, inkeyname, 0, (int)regsam.queryvalue | (int)in32or64key, out hkey);         if (0 != lresult) return null;         registryvaluekind lptype = 0;         uint lpcbdata = 2048;         // make big buffer first time         byte[] bytebuffer = new byte[1000];         // first time, real size         regqueryvalueex(hkey, inpropertyname, 0, ref lptype, bytebuffer, ref lpcbdata);         // create correctly sized buffer         bytebuffer = new byte[lpcbdata];         // real value         regqueryvalueex(hkey, inpropertyname, 0, ref lptype, bytebuffer, ref lpcbdata);         return bytebuffer;       }     { if (0 != hkey) regclosekey(hkey); } } 

and reg_binary code in string so:

byte[] bytevalue64 = new byte[1024]; registrykey localkey = registry.localmachine; localkey = localkey.opensubkey(@"software\microsoft\windows nt\currentversion"); if (localkey != null) {     bytevalue64 = getregkey64asbytearray(hkey_local_machine, @"software\microsoft\windows nt\currentversion", regsam.wow64_64key, "digitalproductid");     string s = convert.tobase64string(bytevalue64);     //need following operation because array returns inverted!     list<int> int_array = new list<int>();     int temp_int = 0, = 0;                     (i = 0; < bytevalue64.length; i++) { temp_int = bytevalue64[i]; int_array.add(temp_int); }     ... int values here } 

at last line sending int array function gives me readable alphanumeric string.

thanks everyone.