How does it work?

MagNumDB is a database that contains about 350,000 items. These items are constants, names, values all extracted from more than 6,000 header files (.h, .hxx, .hpp, .idl, etc.) provided by standard Windows and Visual Studio SDKs and WDKs.

Some values have been extracted from the very special uuid.lib file that contains the value of thousands of guids and property keys, not present anywhere else in header files. This can explain some duplicates (because names in uuid.lib are not always exactly the same as names in .h parsed files...).

It also contains around 36,0000 undocumented guids that we found ... meeeeep ...


To build this database, we have tried many existing parsers, things like CLANG or other fine tools, but they just don't suit our needs. They can't handle thousands of files that don't compile together, they can't handle some specific (or just very old) Microsoft constructs or annotations, they don't remember the stack of #define directives that led to a definition, they only give you a final AST, not a partial one, etc.

So, in the end, we have written a C/C++ parser named C2P5 (for C/CPP/PreProcessor/Parser), tailored specifically for computing constants. C2P5 is capable of preprocessing, parsing and partially evaluating all header files as if they were included in a one big virtual project (that of course, does not compile) on a 32G RAM machine. It currently supports the following preprocessor and C/C++ constructs:

  • #define preprocessor that define constants
  • #define preprocessor that define expression to compute constants
  • C and C++ constants, strings and enum definitions, and some level of pointerness
  • Special GUID constructs like DECLSPEC_UUID, DEFINE_GUIDSTRUCT, MIDL_INTERFACE, you name it
  • PROPERTYKEY constructs
  • Some IDL constructs
  • Etc.

The parser remembers dynamic preprocessor definitions (#if, #ifdef, etc.) that are conditions for constants definitions and expression computation. All parsed items are saved in the database, as well as the associated conditions. There may be more than one item corresponding to a given name, if there are differences in their associated conditions stack.

C2P5 supports the following types of constants, regardless of the way they are defined in source files:

  • integer, signed or unsigned, from 8-bit to 128-bit
  • floating point number, single (32-bit) or double (64-bit)
  • globally unique identifier, or guid, uuid, CLSID, IID, etc.
  • string, in narrow, wide, or utf-8/16/32 formats
  • character, in narrow, wide, or utf-8/16/32 formats
  • pointer, a constant cast as a pointer
  • property key, or PROPERTYKEY, or PKEY, a combination of a guid (fmtid) and a 32-bit integer (id).

 Powered by

C2P5 and this MagNumDB web site are written in C# and use a Lucene database as a full-text search engine. C2P5 uses a custom ANTLR4cs C grammar for expression parsing, not for preprocessor parsing.


 Frequently Asked Questions

  • Q: Can I run custom queries?
    A: Yes. You can use Lucene's query syntax. Note the Database is case insensitive. Check out the list of columns with their corresponding database column names:

    • Index: the item's index.
    • Name: the item's name, or title. For enum values, it's prefixed with the enum's name.
      Corresponding database field: title.
    • Type: the item's type, expressed in a specific, universal system.
      Corresponding database's field: valuetype, but use the value of the Storage type column for queries on items type.
    • Value: the item's value. For string values, it's displayed as is w/o quotes nor escaping.
      Corresponding database field: value. There is also a typedvalue field that can contain database's Int32, Int64, Float, Double or String typed values.
    • Hex Value: the item's hexadecimal value, only valid for integer types.
      There is no corresponding database field.
    • Signed Value: the item's signed value, only valid for integer and double types. Useful when you found a unsigned number and want to get the corresponding signed value (uint -> int for example).
      There is no corresponding database field.
    • Source lines(s): the source lines from which the item was extracted. Comments and characters such as TAB, CR are preserved.
      Corresponding database field: source.
    • File path: the file path from which the item was extracted, terminated by the line index.
      Corresponding database field: filepath. There are also directory and filename fields. filename is useful to query for values in a given file.
    • Score: Database's score value. Items are returned sorted by score.
    • Guid formats: a utility columns that proposes all possible guid formats. Only valid for guid types.
      There is no corresponding database field
    • Char type: the character encoding (narrow, wide, etc.). Only valid for char and string values.
      Corresponding database field: chartype.
    • Storage type: the exact storage type in the database. Only used for specific queries.
      Corresponding database field: valuetype.
    • Conditions: the list of preprocessor conditions for a given item. If a condition is surrounded with a REVERSE function, it means the reverse condition of what's surrounded was the condition.
      Corresponding database field: conditions. There may be multiple conditions fields for one item.

    Some important points to note:

    • If you search for a negative number (like error codes expressed using signed integers), you can surround the search with double quotes, for example searching for "-2147009290" is equivalent to searching for 0x80073CF6, 80073CF6 (or even 3CF6 in this specific case). If you don't surround negative numbers with double quotes, the system will search for signed and unsigned corresponding values.
    • The full-text search uses items' name, value, hex value, guid formats, source lines, etc. so refine your search if you get back too many items.
    • You can search for guid binary values using just a part of their full definition. For example, if you search for '79eac9c5', it will get you 3 guid entries
    • Leading wild card search (*whatever) is allowed, but it may slow down the search significantly.

    Here are some example or custom queries:

    title:wm_user returns the WM_USER Windows message item, not all items that reference the WM_USER token.

    title:wm_u* returns all items (Windows messages probably) whose name starts with WM_U*.

    value:1024 AND title:wm_* returns all items (Windows messages probably) whose name starts with WM_U* and value is 1024. Note AND must be UPPERCASE for database to understand it as an AND operator.

    value:"00000002-0000-0000-C000-000000000046" returns the IMalloc IID guid value.

  • Q: I always get back 400 items at most. Why?
    A: The MagNumDb site currently limits the number of returned items to this value by design. This should be enough for most real search scenarios (like enums with a big list of values).

  • Q: Some values are empty. Why?
    A: The expression evaluator cannot always compute the final value, because it sometimes require contextual information (custom defines, compiler architecture, etc.) that the parser doesn't have at parsing time. You can enable the Source line(s) column to check what's the corresponding source and try to work it out by yourself. The origin file path and line number is also included.

  • Q: Can I get all values for a given enum?
    A: Sure. For example, __VSHPROPID is the name of an enum, and a query like this: parent:__VSHPROPID will get all the enum's values (66 entries).

  • Q: I sometimes get back items whose name starts with "__magnumdb__enum_". Why?
    A: C allows unnamed enums. The MagNumDb parser just gives them a name, using the defining file name and a counter.

  • Q: I sometimes get back the same item/name twice or more with different values. For example:  TARGET_IS_NT60_OR_LATER. Why?
    A: This can be the case with defines. Their value may be different if they were surrounded by # directives (#if, #else, etc.) in the original source code. You can enable the Condition(s) column to check what are the corresponding conditions for a given item.
    Note: if a condition is surrounded with a funny REVERSE function token, it means the reverse condition of what's surrounded.

 Database Metrics

  • Last update date: Thursday May 13, 2020
  • Items count: 340878
  • Parsed files count: 8447
  • Windows SDK version: 10.0.19041.0
  • NetFx SDK version: 4.8
  • MSVC Tools version: 14.25.28610



We welcome feedback.
Seen anything missing? A bug? A wrong value? Do you have any suggestion for improvements? Do you have an idea for a cool new feature?

Please contact us here

 About MagNumDB

MagNumDB  2017-2020 Simon Mourier V1.3.2. All rights reserved.

Profile for Simon Mourier at Stack Overflow, Q&A for professional and enthusiast programmers

All product names, logos, and brands are property of their respective owners. All company, product and service names used in this website are for identification purposes only.

All values, names, source code fragments displayed here have been extracted from files that are property of their respective owners.


Index Score Name Type Value Hex value Signed value Guid formats Char type Storage type Source line(s) File path Condition(s)
Index Score Name Type Value Hex value Signed value Guid formats Char type Storage type Source line(s) File path Condition(s)
1 10.02571 ActivationKind::Contact Int32 14 0x0000000E 14 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                Contact                             = 14,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(655,0)
2 10.02571 ActivationKind::Launch Int32 0 0x00000000 0 System.Int32
Launch                              = 0,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(639,0)
3 10.02571 ActivationKind::Search Int32 1 0x00000001 1 System.Int32
Search                              = 1,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(640,0)
4 10.02571 ActivationKind::ShareTarget Int32 2 0x00000002 2 System.Int32
ShareTarget                         = 2,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(641,0)
5 10.02571 ActivationKind::File Int32 3 0x00000003 3 System.Int32
File                                = 3,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(642,0)
6 10.02571 ActivationKind::Protocol Int32 4 0x00000004 4 System.Int32
Protocol                            = 4,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(643,0)
7 10.02571 ActivationKind::FileOpenPicker Int32 5 0x00000005 5 System.Int32
FileOpenPicker                      = 5,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(644,0)
8 10.02571 ActivationKind::FileSavePicker Int32 6 0x00000006 6 System.Int32
FileSavePicker                      = 6,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(645,0)
9 10.02571 ActivationKind::CachedFileUpdater Int32 7 0x00000007 7 System.Int32
CachedFileUpdater                   = 7,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(646,0)
10 10.02571 ActivationKind::ContactPicker Int32 8 0x00000008 8 System.Int32
ContactPicker                       = 8,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(647,0)
11 10.02571 ActivationKind::Device Int32 9 0x00000009 9 System.Int32
Device                              = 9,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(648,0)
12 10.02571 ActivationKind::PrintTaskSettings Int32 10 0x0000000A 10 System.Int32
PrintTaskSettings                   = 10,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(649,0)
13 10.02571 ActivationKind::CameraSettings Int32 11 0x0000000B 11 System.Int32
CameraSettings                      = 11,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(650,0)
14 10.02571 ActivationKind::RestrictedLaunch Int32 12 0x0000000C 12 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                RestrictedLaunch                    = 12,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(651,0)
15 10.02571 ActivationKind::AppointmentsProvider Int32 13 0x0000000D 13 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                AppointmentsProvider                = 13,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(653,0)
16 10.02571 ActivationKind::LockScreenCall Int32 15 0x0000000F 15 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                LockScreenCall                      = 15,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(657,0)
17 10.02571 ActivationKind::VoiceCommand Int32 16 0x00000010 16 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                VoiceCommand                        = 16,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(659,0)
18 10.02571 ActivationKind::LockScreen Int32 17 0x00000011 17 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                LockScreen                          = 17,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(661,0)
19 10.02571 ActivationKind::PickerReturned Int32 1000 0x000003E8 1000 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                PickerReturned                      = 1000,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(663,0)
20 10.02571 ActivationKind::WalletAction Int32 1001 0x000003E9 1001 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                WalletAction                        = 1001,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(665,0)
21 10.02571 ActivationKind::PickFileContinuation Int32 1002 0x000003EA 1002 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                PickFileContinuation                = 1002,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(667,0)
22 10.02571 ActivationKind::PickSaveFileContinuation Int32 1003 0x000003EB 1003 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                PickSaveFileContinuation            = 1003,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(669,0)
23 10.02571 ActivationKind::PickFolderContinuation Int32 1004 0x000003EC 1004 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                PickFolderContinuation              = 1004,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(671,0)
24 10.02571 ActivationKind::WebAuthenticationBrokerContinuation Int32 1005 0x000003ED 1005 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                WebAuthenticationBrokerContinuation = 1005,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(673,0)
25 10.02571 ActivationKind::WebAccountProvider Int32 1006 0x000003EE 1006 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                WebAccountProvider                  = 1006,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(675,0)
26 10.02571 ActivationKind::ComponentUI Int32 1007 0x000003EF 1007 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                ComponentUI                         = 1007,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(677,0)
27 10.02571 ActivationKind::ProtocolForResults Int32 1009 0x000003F1 1009 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                ProtocolForResults                  = 1009,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(679,0)
28 10.02571 ActivationKind::ToastNotification Int32 1010 0x000003F2 1010 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                ToastNotification                   = 1010,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(681,0)
29 10.02571 ActivationKind::Print3DWorkflow Int32 1011 0x000003F3 1011 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 2.0)]
                Print3DWorkflow                     = 1011,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(683,0)
30 10.02571 ActivationKind::DialReceiver Int32 1012 0x000003F4 1012 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 1.0)]
                DialReceiver                        = 1012,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(685,0)
31 10.02571 ActivationKind::DevicePairing Int32 1013 0x000003F5 1013 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 2.0)]
                DevicePairing                       = 1013,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(687,0)
32 10.02571 ActivationKind::UserDataAccountsProvider Int32 1014 0x000003F6 1014 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 3.0)]
                UserDataAccountsProvider            = 1014,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(689,0)
33 10.02571 ActivationKind::FilePickerExperience Int32 1015 0x000003F7 1015 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 3.0)]
                FilePickerExperience                = 1015,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(691,0)
34 10.02571 ActivationKind::LockScreenComponent Int32 1016 0x000003F8 1016 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 4.0)]
                LockScreenComponent                 = 1016,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(693,0)
35 10.02571 ActivationKind::ContactPanel Int32 1017 0x000003F9 1017 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 4.0)]
                ContactPanel                        = 1017,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(695,0)
36 10.02571 ActivationKind::PrintWorkflowForegroundTask Int32 1018 0x000003FA 1018 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 5.0)]
                PrintWorkflowForegroundTask         = 1018,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(697,0)
37 10.02571 ActivationKind::GameUIProvider Int32 1019 0x000003FB 1019 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 5.0)]
                GameUIProvider                      = 1019,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(699,0)
38 10.02571 ActivationKind::StartupTask Int32 1020 0x000003FC 1020 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 5.0)]
                StartupTask                         = 1020,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(701,0)
39 10.02571 ActivationKind::CommandLineLaunch Int32 1021 0x000003FD 1021 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 5.0)]
                CommandLineLaunch                   = 1021,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(703,0)
40 10.02571 ActivationKind::BarcodeScannerProvider Int32 1022 0x000003FE 1022 System.Int32
[contract(Windows.Foundation.UniversalApiContract, 6.0)]
                BarcodeScannerProvider              = 1022
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\Windows.Applicationmodel.Activation.idl(705,0)