Getting registry value's data type (REG_SZ/REG_EXPAND_SZ)

[Asaf Ganot]

Hi,
I'm looking for a way to retrieve the date type of a registry value using
c#.
Since I couldn't find a way to do it with 'Microsoft.Win32', I tried to use
the good old API call 'RegEnumValue' which gives you the data type as well
as other things...

After many tries, I managed to call the function without any errors.
However, I get the data type, but not the value's name! (I even get the name
length, but the string that supose to recive the name is exactly I
initialized it.

Please help!



Here is the declartion section:

public class APIImportDLLs

{

#region Class Functions

[DllImport("advapi32.dll", EntryPoint="RegEnumValue")]

public static extern int RegEnumValueA(int hKey, int dwIndex, string
lpValueName, ref int lpcbValueName, int lpReserved, ref int lpType, ref byte
lpData, ref int lpcbData);

[DllImport("advapi32.dll", EntryPoint="RegOpenKey")]

public static extern int RegOpenKeyA(int hKey, string lpSubKey, ref int
phkResult) ;

#endregion

public int APIConvertHKey(string hkey)

{

switch(hkey.ToUpper())

{

case "HKEY_CLASSES_ROOT":

case "HKCR":

return System.Convert.ToInt32("80000000",16);

case "HKEY_CURRENT_CONFIG":

case "HKCC":

return System.Convert.ToInt32("80000005",16);

case "HKEY_CURRENT_USER":

case "HKCU":

return System.Convert.ToInt32("80000001",16);

case "HKEY_DYN_DATA":

case "HKDD":

return System.Convert.ToInt32("80000006",16);

case "HKEY_LOCAL_MACHINE":

case "HKLM":

return System.Convert.ToInt32("80000002",16);

//case "HKEY_PERFORMANCE_DATA":

//case "HKPD":

// return System.Convert.ToInt32("80000000",16);

case "HKEY_USERS":

case "HKU":

return System.Convert.ToInt32("80000003",16);

default:

return 0;

}

}

}











Here is my function:



public struct_RegValue GetRegValue(string path)

{

APIImportDLLs apiclass = new APIImportDLLs();

int ret;

int hresult = 0;

int index = 0;

//string curval = " ";

string curval = "";

char[] chr = new char[255];

byte data = 0;

int namelen = 255;

int datelen = 255;

int type = 0;

struct_RegValue regval = new struct_RegValue();

for(int i=0;i<255;i++)

{

curval=curval + " ";

}

string hkey = path.Substring(0,path.IndexOf(@"\"));

string keypath = path.Substring(path.IndexOf(@"\")+1);

ret = APIImportDLLs.RegOpenKeyA(apiclass.APIConvertHKey(hkey),keypath + '\0'
,ref hresult);

if(ret!=0)

{

throw(new Exception("Error openning key using API function 'RegOpenKeyA'"));

}

while(APIImportDLLs.RegEnumValueA(hresult,index,curval,ref namelen,0,ref
type,ref data,ref datelen)!=259)

{

Console.WriteLine(type.ToString());

index++;

}

string temp = path.Substring(0,path.IndexOf(@"\"));

regval.RegKey = GetRegKey(path);

string[] valnames = regval.RegKey.GetValueNames();

foreach (string str in valnames)

{

Console.WriteLine(str);

}

return regval;

}

 

[Mattias Sjögren]

[DllImport("advapi32.dll", EntryPoint="RegEnumValue")]

public static extern int RegEnumValueA(int hKey, int dwIndex, string
lpValueName, ref int lpcbValueName, int lpReserved, ref int lpType, ref byte
lpData, ref int lpcbData);

Make lpValueName a System.Text.StringBuilder instead of a string.



Mattias