New subject: [Bug 31087] WMI class property retrieval: some CIM data type to OLE variant (VT) mappings are incorrect (CIM_UINT32, CIM_UINT16 ...)

30 Jun 2012


      http://bugs.winehq.org/show_bug.cgi?id=31087
Bug #: 31087
           Summary: WMI class property retrieval: some CIM data type to
                    OLE variant (VT) mappings are incorrect (CIM_UINT32,
                    CIM_UINT16 ...)
           Product: Wine
           Version: 1.5.7
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: wmi&wbemprox
        AssignedTo: wine-bugs@winehq.org
        ReportedBy: focht@gmx.net
    Classification: Unclassified
Hello,
another problem from app in bug 24875 which deserves an extra bug.
The app still fails with wine-1.5.7-252-g1f01355
The problems seems to be a WMI -> .NET type conversion problem of "ProcessId"
property value.
"InvalidCastException" is thrown
--- snip ---
006ee1e8 7b83953f [HelperMethodFrame: 006ee1e8] 
006ee258 040347f6
System.Management.PropertyData.MapWmiValueToValue(System.Object,
System.Management.CimType, Boolean)
006ee2d0 04034204 System.Management.PropertyData.get_Value()
006ee2dc 04033aa6
System.Management.ManagementBaseObject.GetPropertyValue(System.String)
006ee2e8 04033a35
System.Management.ManagementBaseObject.get_Item(System.String)
006ee2ec 04034f70
SSCustomInstaller.SSInstaller.GetSongsmithSetupPathAndCopyMSI()
006ee31c 04034c0f
SSCustomInstaller.SSInstaller.Install(System.Collections.IDictionary)
006ee350 649e3fc6
System.Configuration.Install.Installer.Install(System.Collections.IDictionary)
006ee398 649e5d38
System.Configuration.Install.AssemblyInstaller.Install(System.Collections.IDictionary)
006ee3d0 649e7f6e
System.Configuration.Install.ManagedInstallerClass.InstallHelper(System.String[])
006ee494 649e7734
System.Configuration.Install.ManagedInstallerClass.System.Configuration.Install.IManagedInstaller.ManagedInstall(System.String,
Int32) 
--- snip ---
MapWmiValueToValue converts WMI values (wrapped in object) to native .NET value
(wrapped in object) with type conversion if necessary.
MSDN claims "ProcessId" is CIM_UINT32/uint32.
The following link shows example "ProcessId" property dump with 'wbemdump'
tool:
http://nukz.net/reference/wmi/hh/wmisdk/wbemdump_8wft.htm
--- snip ---
wbemdump /Q /wy root\cimv2 WQL "SELECT ProcessId
FROM Win32_process WHERE Name = 'Winmgmt.exe'"
This command produces the following output:
(WQL) SELECT ProcessId FROM Win32_Process WHERE Name = 'Winmgmt.exe'
ProcessId (CIM_UINT32/uint32) = 644 (0x284)
--- snip ---
For CIM_UINT32 type there seems to be 'unboxing' taking place:
net_value = (uint)((int)(wmi_value))
I extracted a small C# snippet from the app .NET assembly which can be used for
easy reproduction of the problem.
Save the following snippet to a text file (ex: "test.cs"):
--- snip test.cs ---
using System;
using System.Collections;
using System.Management;
class TestProgram
{
    [STAThread]
    static void Main(string[] args)
    {
        using (ManagementObjectSearcher searcher = new
ManagementObjectSearcher("Select * from Win32_Process"))
        {
            new ManagementScope(@"root\CIMV2");
            foreach (ManagementObject obj2 in searcher.Get())
            {
                string str = obj2["ProcessId"].ToString();
            }
        }
    }
} 
--- snip test.cs ---
Compile it with C# compiler which is present if you installed .NET 2.0
Framework (winetricks).
--- snip ---
$ wine "C:\windows\Microsoft.NET\Framework\v2.0.50727\csc.exe" /debug+
test.cs 
--- snip ---
Run and get the same backtrace as with installer.
The problem is CIMTYPE -> OLE Variant type conversion.
Source:
http://source.winehq.org/git/wine.git/blob/d2661b802556e073760af5d70869fb55a...
--- snip ---
 665 HRESULT get_propval( const struct view *view, UINT index, const WCHAR
*name, VARIANT *ret,
 666                      CIMTYPE *type, LONG *flavor )
 667 {
...
 681     switch (view->table->columns[column].type & COL_TYPE_MASK)
 682     {
 683     case CIM_STRING:
 684     case CIM_DATETIME:
 685         V_VT( ret ) = VT_BSTR;
 686         V_BSTR( ret ) = SysAllocString( (const WCHAR *)(INT_PTR)val );
 687         break;
 688     case CIM_SINT16:
 689         V_VT( ret ) = VT_I2;
 690         V_I2( ret ) = val;
 691         break;
 692     case CIM_UINT16:
 693         V_VT( ret ) = VT_UI2;
 694         V_UI2( ret ) = val;
 695         break;
 696     case CIM_SINT32:
 697         V_VT( ret ) = VT_I4;
 698         V_I4( ret ) = val;
 699         break;
 700     case CIM_UINT32:
 701         V_VT( ret ) = VT_UI4;
 702         V_UI4( ret ) = val;
 703         break;
 704     case CIM_SINT64:
 705         V_VT( ret ) = VT_BSTR;
 706         V_BSTR( ret ) = get_value_bstr( view->table, row, column );
 707         break;
 708     case CIM_UINT64:
 709         V_VT( ret ) = VT_BSTR;
 710         V_BSTR( ret ) = get_value_bstr( view->table, row, column );
 711         break;
...
--- snip ---
The unbox failure let me guess that CIM_UINT32 doesn't map to VT_UI4 but to
VT_I4.
Google "CIM_UINT32 VT_I4" and hit the first link -> book "Developing Wmi
Solutions: A Guide to Windows Management ..."
Bingo! There is a table which shows the type mapping (BTW good WMI resource to
read...)
uint32 - VT_I4 - CIM_UINT32
While you're at it you might want to fix other type conversions (CIM_UINT16
...) according to the table.
Regards
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[Bug 31087] New: WMI class property retrieval: some CIM data type to OLE variant (VT) mappings are incorrect (CIM_UINT32, CIM_UINT16 ...)