Question

I can’t get REG_DWORD data from USBSTOR registry key, but I can get ‘DisplayName’ data of REG_SZ type

ManagementScope myScope = new ManagementScope("\\\\" + strComputer + "\\root\\default");
ManagementPath mypath = new ManagementPath("StdRegProv");
ManagementClass mc = new ManagementClass(myScope, mypath, null);
ManagementBaseObject inParams = mc.GetMethodParameters("GetStringValue");
inParams["sSubKeyName"] = @"SYSTEM\CurrentControlSet\services\USBSTOR";
inParams["sValueName"] = "DisplayName";
ManagementBaseObject outParams = mc.InvokeMethod("GetStringValue", inParams, null);
Console.WriteLine(outParams["Type"].ToString());

Answer 1

You should use the GetDWORDValue method if data type is REG_DWORD and GetStringValue method if data type is REG_SZ:

ManagementBaseObject inParams = mc.GetMethodParameters("GetDWORDValue");
inParams["sSubKeyName"] = @"SYSTEM\CurrentControlSet\services\USBSTOR";
inParams["sValueName"] = "Type";
ManagementBaseObject outParams = mc.InvokeMethod("GetDWORDValue", inParams, null);
UInt32 uValue = (UInt32)outParams["uValue"];
//...
ManagementBaseObject inParams = mc.GetMethodParameters("GetStringValue");
inParams["sSubKeyName"] = @"SYSTEM\CurrentControlSet\services\USBSTOR";
inParams["sValueName"] = "DisplayName";
ManagementBaseObject outParams = mc.InvokeMethod("GetStringValue", inParams, null);
string sValue = (string)outParams["sValue"];