How does it work?

MagNumDB is a database that contains about 360,000 items. These items are constants, names, values all extracted from more than 9,000 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.

  • Q: I can't connect from an IP address but from another one, it works. Why?
    A: The server is constantly monitored for excessive usage. It's possible your IP address has been banned because massive sets of queries where observed. If you think this is an error, send us an email.

 Database Metrics

  • Last update date: Thursday October 7, 2021
  • Items count: 362743
  • Parsed files count: 9541
  • Windows SDK version: 10.0.22000.0
  • NetFx SDK version: 4.8
  • MSVC Tools version: 14.29.30133

 Rest API

There is a JSON version API (you will have to figure out the schema, it's pretty obvious) that you can call here (the search query is the 'q' parameter):

Note this API also has a 400 items maximum limit and the server is monitored for excessive usage (the key can be removed without notice). If you want to get a key, send us an email.



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  2017-2021 Simon Mourier V1.4.0. 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 10.40025 __VSHPROPID2::VSHPROPID_PropertyPagesCLSIDList Int32 -2065 0xFFFFF7EF -2065 System.Int32
VSHPROPID_PropertyPagesCLSIDList	= -2065,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1814,0)
2 10.40025 __VSHPROPID2::VSHPROPID_CfgPropertyPagesCLSIDList Int32 -2066 0xFFFFF7EE -2066 System.Int32
VSHPROPID_CfgPropertyPagesCLSIDList	= -2066,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1815,0)
3 10.40025 __VSHPROPID2::VSHPROPID_ExtObjectCATID Int32 -2067 0xFFFFF7ED -2067 System.Int32
VSHPROPID_ExtObjectCATID	= -2067,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1816,0)
4 10.40025 __VSHPROPID2::VSHPROPID_BrowseObjectCATID Int32 -2068 0xFFFFF7EC -2068 System.Int32
VSHPROPID_BrowseObjectCATID	= -2068,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1817,0)
5 10.40025 __VSHPROPID2::VSHPROPID_CfgBrowseObjectCATID Int32 -2069 0xFFFFF7EB -2069 System.Int32
VSHPROPID_CfgBrowseObjectCATID	= -2069,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1818,0)
6 10.40025 __VSHPROPID2::VSHPROPID_AddItemTemplatesGuid Int32 -2070 0xFFFFF7EA -2070 System.Int32
VSHPROPID_AddItemTemplatesGuid	= -2070,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1819,0)
7 10.40025 __VSHPROPID2::VSHPROPID_ChildrenEnumerated Int32 -2071 0xFFFFF7E9 -2071 System.Int32
VSHPROPID_ChildrenEnumerated	= -2071,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1820,0)
8 10.40025 __VSHPROPID2::VSHPROPID_StatusBarClientText Int32 -2072 0xFFFFF7E8 -2072 System.Int32
VSHPROPID_StatusBarClientText	= -2072,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1821,0)
9 10.40025 __VSHPROPID2::VSHPROPID_DebuggeeProcessId Int32 -2073 0xFFFFF7E7 -2073 System.Int32
VSHPROPID_DebuggeeProcessId	= -2073,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1822,0)
10 10.40025 __VSHPROPID2::VSHPROPID_IsLinkFile Int32 -2074 0xFFFFF7E6 -2074 System.Int32
VSHPROPID_IsLinkFile	= -2074,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1823,0)
11 10.40025 __VSHPROPID2::VSHPROPID_KeepAliveDocument Int32 -2075 0xFFFFF7E5 -2075 System.Int32
VSHPROPID_KeepAliveDocument	= -2075,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1824,0)
12 10.40025 __VSHPROPID2::VSHPROPID_SupportsProjectDesigner Int32 -2076 0xFFFFF7E4 -2076 System.Int32
VSHPROPID_SupportsProjectDesigner	= -2076,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1825,0)
13 10.40025 __VSHPROPID2::VSHPROPID_IntellisenseUnknown Int32 -2077 0xFFFFF7E3 -2077 System.Int32
VSHPROPID_IntellisenseUnknown	= -2077,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1826,0)
14 10.40025 __VSHPROPID2::VSHPROPID_IsUpgradeRequired Int32 -2078 0xFFFFF7E2 -2078 System.Int32
VSHPROPID_IsUpgradeRequired	= -2078,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1827,0)
15 10.40025 __VSHPROPID2::VSHPROPID_DesignerHiddenCodeGeneration Int32 -2079 0xFFFFF7E1 -2079 System.Int32
VSHPROPID_DesignerHiddenCodeGeneration	= -2079,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1828,0)
16 10.40025 __VSHPROPID2::VSHPROPID_SuppressOutOfDateMessageOnBuild Int32 -2080 0xFFFFF7E0 -2080 System.Int32
VSHPROPID_SuppressOutOfDateMessageOnBuild	= -2080,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1829,0)
17 10.40025 __VSHPROPID2::VSHPROPID_Container Int32 -2081 0xFFFFF7DF -2081 System.Int32
VSHPROPID_Container	= -2081,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1830,0)
18 10.40025 __VSHPROPID2::VSHPROPID_UseInnerHierarchyIconList Int32 -2082 0xFFFFF7DE -2082 System.Int32
VSHPROPID_UseInnerHierarchyIconList	= -2082,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1831,0)
19 10.40025 __VSHPROPID2::VSHPROPID_EnableDataSourceWindow Int32 -2083 0xFFFFF7DD -2083 System.Int32
VSHPROPID_EnableDataSourceWindow	= -2083,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1832,0)
20 10.40025 __VSHPROPID2::VSHPROPID_AppTitleBarTopHierarchyName Int32 -2084 0xFFFFF7DC -2084 System.Int32
VSHPROPID_AppTitleBarTopHierarchyName	= -2084,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1833,0)
21 10.40025 __VSHPROPID2::VSHPROPID_DebuggerSourcePaths Int32 -2085 0xFFFFF7DB -2085 System.Int32
VSHPROPID_DebuggerSourcePaths	= -2085,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1834,0)
22 10.40025 __VSHPROPID2::VSHPROPID_CategoryGuid Int32 -2086 0xFFFFF7DA -2086 System.Int32
VSHPROPID_CategoryGuid	= -2086,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1835,0)
23 10.40025 __VSHPROPID2::VSHPROPID_DisableApplicationSettings Int32 -2087 0xFFFFF7D9 -2087 System.Int32
VSHPROPID_DisableApplicationSettings	= -2087,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1836,0)
24 10.40025 __VSHPROPID2::VSHPROPID_ProjectDesignerEditor Int32 -2088 0xFFFFF7D8 -2088 System.Int32
VSHPROPID_ProjectDesignerEditor	= -2088,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1837,0)
25 10.40025 __VSHPROPID2::VSHPROPID_PriorityPropertyPagesCLSIDList Int32 -2089 0xFFFFF7D7 -2089 System.Int32
VSHPROPID_PriorityPropertyPagesCLSIDList	= -2089,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1838,0)
26 10.40025 __VSHPROPID2::VSHPROPID_NoDefaultNestedHierSorting Int32 -2090 0xFFFFF7D6 -2090 System.Int32
VSHPROPID_NoDefaultNestedHierSorting	= -2090,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1839,0)
27 10.40025 __VSHPROPID2::VSHPROPID_ExcludeFromExportItemTemplate Int32 -2091 0xFFFFF7D5 -2091 System.Int32
VSHPROPID_ExcludeFromExportItemTemplate	= -2091,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1840,0)
28 10.40025 __VSHPROPID2::VSHPROPID_SupportedMyApplicationTypes Int32 -2092 0xFFFFF7D4 -2092 System.Int32
VSHPROPID_SupportedMyApplicationTypes	= -2092,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1841,0)
29 10.40025 __VSHPROPID2::VSHPROPID_FIRST2 Int32 -2092 0xFFFFF7D4 -2092 System.Int32
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell80.h(1842,0)