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 AutomationTextAttributesEnum::AnimationStyleAttribute Int32 40000 0x00009C40 -25536 System.Int32
AnimationStyleAttribute          = 40000,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1226,0)
2 10.02571 AutomationTextAttributesEnum::BackgroundColorAttribute Int32 40001 0x00009C41 -25535 System.Int32
BackgroundColorAttribute         = 40001,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1227,0)
3 10.02571 AutomationTextAttributesEnum::BulletStyleAttribute Int32 40002 0x00009C42 -25534 System.Int32
BulletStyleAttribute             = 40002,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1228,0)
4 10.02571 AutomationTextAttributesEnum::CapStyleAttribute Int32 40003 0x00009C43 -25533 System.Int32
CapStyleAttribute                = 40003,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1229,0)
5 10.02571 AutomationTextAttributesEnum::CultureAttribute Int32 40004 0x00009C44 -25532 System.Int32
CultureAttribute                 = 40004,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1230,0)
6 10.02571 AutomationTextAttributesEnum::FontNameAttribute Int32 40005 0x00009C45 -25531 System.Int32
FontNameAttribute                = 40005,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1231,0)
7 10.02571 AutomationTextAttributesEnum::FontSizeAttribute Int32 40006 0x00009C46 -25530 System.Int32
FontSizeAttribute                = 40006,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1232,0)
8 10.02571 AutomationTextAttributesEnum::FontWeightAttribute Int32 40007 0x00009C47 -25529 System.Int32
FontWeightAttribute              = 40007,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1233,0)
9 10.02571 AutomationTextAttributesEnum::ForegroundColorAttribute Int32 40008 0x00009C48 -25528 System.Int32
ForegroundColorAttribute         = 40008,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1234,0)
10 10.02571 AutomationTextAttributesEnum::HorizontalTextAlignmentAttribute Int32 40009 0x00009C49 -25527 System.Int32
HorizontalTextAlignmentAttribute = 40009,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1235,0)
11 10.02571 AutomationTextAttributesEnum::IndentationFirstLineAttribute Int32 40010 0x00009C4A -25526 System.Int32
IndentationFirstLineAttribute    = 40010,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1236,0)
12 10.02571 AutomationTextAttributesEnum::IndentationLeadingAttribute Int32 40011 0x00009C4B -25525 System.Int32
IndentationLeadingAttribute      = 40011,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1237,0)
13 10.02571 AutomationTextAttributesEnum::IndentationTrailingAttribute Int32 40012 0x00009C4C -25524 System.Int32
IndentationTrailingAttribute     = 40012,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1238,0)
14 10.02571 AutomationTextAttributesEnum::IsHiddenAttribute Int32 40013 0x00009C4D -25523 System.Int32
IsHiddenAttribute                = 40013,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1239,0)
15 10.02571 AutomationTextAttributesEnum::IsItalicAttribute Int32 40014 0x00009C4E -25522 System.Int32
IsItalicAttribute                = 40014,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1240,0)
16 10.02571 AutomationTextAttributesEnum::IsReadOnlyAttribute Int32 40015 0x00009C4F -25521 System.Int32
IsReadOnlyAttribute              = 40015,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1241,0)
17 10.02571 AutomationTextAttributesEnum::IsSubscriptAttribute Int32 40016 0x00009C50 -25520 System.Int32
IsSubscriptAttribute             = 40016,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1242,0)
18 10.02571 AutomationTextAttributesEnum::IsSuperscriptAttribute Int32 40017 0x00009C51 -25519 System.Int32
IsSuperscriptAttribute           = 40017,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1243,0)
19 10.02571 AutomationTextAttributesEnum::MarginBottomAttribute Int32 40018 0x00009C52 -25518 System.Int32
MarginBottomAttribute            = 40018,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1244,0)
20 10.02571 AutomationTextAttributesEnum::MarginLeadingAttribute Int32 40019 0x00009C53 -25517 System.Int32
MarginLeadingAttribute           = 40019,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1245,0)
21 10.02571 AutomationTextAttributesEnum::MarginTopAttribute Int32 40020 0x00009C54 -25516 System.Int32
MarginTopAttribute               = 40020,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1246,0)
22 10.02571 AutomationTextAttributesEnum::MarginTrailingAttribute Int32 40021 0x00009C55 -25515 System.Int32
MarginTrailingAttribute          = 40021,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1247,0)
23 10.02571 AutomationTextAttributesEnum::OutlineStylesAttribute Int32 40022 0x00009C56 -25514 System.Int32
OutlineStylesAttribute           = 40022,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1248,0)
24 10.02571 AutomationTextAttributesEnum::OverlineColorAttribute Int32 40023 0x00009C57 -25513 System.Int32
OverlineColorAttribute           = 40023,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1249,0)
25 10.02571 AutomationTextAttributesEnum::OverlineStyleAttribute Int32 40024 0x00009C58 -25512 System.Int32
OverlineStyleAttribute           = 40024,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1250,0)
26 10.02571 AutomationTextAttributesEnum::StrikethroughColorAttribute Int32 40025 0x00009C59 -25511 System.Int32
StrikethroughColorAttribute      = 40025,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1251,0)
27 10.02571 AutomationTextAttributesEnum::StrikethroughStyleAttribute Int32 40026 0x00009C5A -25510 System.Int32
StrikethroughStyleAttribute      = 40026,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1252,0)
28 10.02571 AutomationTextAttributesEnum::TabsAttribute Int32 40027 0x00009C5B -25509 System.Int32
TabsAttribute                    = 40027,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1253,0)
29 10.02571 AutomationTextAttributesEnum::TextFlowDirectionsAttribute Int32 40028 0x00009C5C -25508 System.Int32
TextFlowDirectionsAttribute      = 40028,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1254,0)
30 10.02571 AutomationTextAttributesEnum::UnderlineColorAttribute Int32 40029 0x00009C5D -25507 System.Int32
UnderlineColorAttribute          = 40029,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1255,0)
31 10.02571 AutomationTextAttributesEnum::UnderlineStyleAttribute Int32 40030 0x00009C5E -25506 System.Int32
UnderlineStyleAttribute          = 40030,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1256,0)
32 10.02571 AutomationTextAttributesEnum::AnnotationTypesAttribute Int32 40031 0x00009C5F -25505 System.Int32
AnnotationTypesAttribute         = 40031,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1257,0)
33 10.02571 AutomationTextAttributesEnum::AnnotationObjectsAttribute Int32 40032 0x00009C60 -25504 System.Int32
AnnotationObjectsAttribute       = 40032,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1258,0)
34 10.02571 AutomationTextAttributesEnum::StyleNameAttribute Int32 40033 0x00009C61 -25503 System.Int32
StyleNameAttribute               = 40033,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1259,0)
35 10.02571 AutomationTextAttributesEnum::StyleIdAttribute Int32 40034 0x00009C62 -25502 System.Int32
StyleIdAttribute                 = 40034,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1260,0)
36 10.02571 AutomationTextAttributesEnum::LinkAttribute Int32 40035 0x00009C63 -25501 System.Int32
LinkAttribute                    = 40035,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1261,0)
37 10.02571 AutomationTextAttributesEnum::IsActiveAttribute Int32 40036 0x00009C64 -25500 System.Int32
IsActiveAttribute                = 40036,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1262,0)
38 10.02571 AutomationTextAttributesEnum::SelectionActiveEndAttribute Int32 40037 0x00009C65 -25499 System.Int32
SelectionActiveEndAttribute      = 40037,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1263,0)
39 10.02571 AutomationTextAttributesEnum::CaretPositionAttribute Int32 40038 0x00009C66 -25498 System.Int32
CaretPositionAttribute           = 40038,
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1264,0)
40 10.02571 AutomationTextAttributesEnum::CaretBidiModeAttribute Int32 40039 0x00009C67 -25497 System.Int32
CaretBidiModeAttribute           = 40039
%ProgramFiles(x86)%\Windows Kits\10\Include\10.0.19041.0\winrt\windows.ui.xaml.idl(1265,0)