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 10.0504 __VSFPROPID::VSFPROPID_NIL Int32 -1 0xFFFFFFFF -1 System.Int32
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9328,0)
2 10.0504 __VSFPROPID::VSFPROPID_LAST Int32 -3000 0xFFFFF448 -3000 System.Int32
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9329,0)
3 10.0504 __VSFPROPID::VSFPROPID_Type Int32 -3000 0xFFFFF448 -3000 System.Int32
VSFPROPID_Type	= -3000,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9330,0)
4 10.0504 __VSFPROPID::VSFPROPID_DocView Int32 -3001 0xFFFFF447 -3001 System.Int32
VSFPROPID_DocView	= -3001,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9331,0)
5 10.0504 __VSFPROPID::VSFPROPID_SPFrame Int32 -3002 0xFFFFF446 -3002 System.Int32
VSFPROPID_SPFrame	= -3002,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9332,0)
6 10.0504 __VSFPROPID::VSFPROPID_SPProjContext Int32 -3003 0xFFFFF445 -3003 System.Int32
VSFPROPID_SPProjContext	= -3003,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9333,0)
7 10.0504 __VSFPROPID::VSFPROPID_Caption Int32 -3004 0xFFFFF444 -3004 System.Int32
VSFPROPID_Caption	= -3004,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9334,0)
8 10.0504 __VSFPROPID::VSFPROPID_WindowState Int32 -3007 0xFFFFF441 -3007 System.Int32
VSFPROPID_WindowState	= -3007,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9335,0)
9 10.0504 __VSFPROPID::VSFPROPID_FrameMode Int32 -3008 0xFFFFF440 -3008 System.Int32
VSFPROPID_FrameMode	= -3008,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9336,0)
10 10.0504 __VSFPROPID::VSFPROPID_IsWindowTabbed Int32 -3009 0xFFFFF43F -3009 System.Int32
VSFPROPID_IsWindowTabbed	= -3009,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9337,0)
11 10.0504 __VSFPROPID::VSFPROPID_UserContext Int32 -3010 0xFFFFF43E -3010 System.Int32
VSFPROPID_UserContext	= -3010,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9338,0)
12 10.0504 __VSFPROPID::VSFPROPID_ViewHelper Int32 -3011 0xFFFFF43D -3011 System.Int32
VSFPROPID_ViewHelper	= -3011,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9339,0)
13 10.0504 __VSFPROPID::VSFPROPID_ShortCaption Int32 -3012 0xFFFFF43C -3012 System.Int32
VSFPROPID_ShortCaption	= -3012,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9340,0)
14 10.0504 __VSFPROPID::VSFPROPID_WindowHelpKeyword Int32 -3013 0xFFFFF43B -3013 System.Int32
VSFPROPID_WindowHelpKeyword	= -3013,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9341,0)
15 10.0504 __VSFPROPID::VSFPROPID_WindowHelpCmdText Int32 -3014 0xFFFFF43A -3014 System.Int32
VSFPROPID_WindowHelpCmdText	= -3014,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9342,0)
16 10.0504 __VSFPROPID::VSFPROPID_DocCookie Int32 -4000 0xFFFFF060 -4000 System.Int32
VSFPROPID_DocCookie	= -4000,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9343,0)
17 10.0504 __VSFPROPID::VSFPROPID_OwnerCaption Int32 -4001 0xFFFFF05F -4001 System.Int32
VSFPROPID_OwnerCaption	= -4001,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9344,0)
18 10.0504 __VSFPROPID::VSFPROPID_EditorCaption Int32 -4002 0xFFFFF05E -4002 System.Int32
VSFPROPID_EditorCaption	= -4002,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9345,0)
19 10.0504 __VSFPROPID::VSFPROPID_pszMkDocument Int32 -4003 0xFFFFF05D -4003 System.Int32
VSFPROPID_pszMkDocument	= -4003,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9346,0)
20 10.0504 __VSFPROPID::VSFPROPID_DocData Int32 -4004 0xFFFFF05C -4004 System.Int32
VSFPROPID_DocData	= -4004,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9347,0)
21 10.0504 __VSFPROPID::VSFPROPID_Hierarchy Int32 -4005 0xFFFFF05B -4005 System.Int32
VSFPROPID_Hierarchy	= -4005,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9348,0)
22 10.0504 __VSFPROPID::VSFPROPID_ItemID Int32 -4006 0xFFFFF05A -4006 System.Int32
VSFPROPID_ItemID	= -4006,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9349,0)
23 10.0504 __VSFPROPID::VSFPROPID_CmdUIGuid Int32 -4007 0xFFFFF059 -4007 System.Int32
VSFPROPID_CmdUIGuid	= -4007,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9350,0)
24 10.0504 __VSFPROPID::VSFPROPID_CreateDocWinFlags Int32 -4008 0xFFFFF058 -4008 System.Int32
VSFPROPID_CreateDocWinFlags	= -4008,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9351,0)
25 10.0504 __VSFPROPID::VSFPROPID_guidEditorType Int32 -4009 0xFFFFF057 -4009 System.Int32
VSFPROPID_guidEditorType	= -4009,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9352,0)
26 10.0504 __VSFPROPID::VSFPROPID_pszPhysicalView Int32 -4010 0xFFFFF056 -4010 System.Int32
VSFPROPID_pszPhysicalView	= -4010,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9353,0)
27 10.0504 __VSFPROPID::VSFPROPID_InheritKeyBindings Int32 -4011 0xFFFFF055 -4011 System.Int32
VSFPROPID_InheritKeyBindings	= -4011,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9354,0)
28 10.0504 __VSFPROPID::VSFPROPID_RDTDocData Int32 -4012 0xFFFFF054 -4012 System.Int32
VSFPROPID_RDTDocData	= -4012,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9355,0)
29 10.0504 __VSFPROPID::VSFPROPID_AltDocData Int32 -4013 0xFFFFF053 -4013 System.Int32
VSFPROPID_AltDocData	= -4013,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9356,0)
30 10.0504 __VSFPROPID::VSFPROPID_GuidPersistenceSlot Int32 -5000 0xFFFFEC78 -5000 System.Int32
VSFPROPID_GuidPersistenceSlot	= -5000,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9357,0)
31 10.0504 __VSFPROPID::VSFPROPID_GuidAutoActivate Int32 -5001 0xFFFFEC77 -5001 System.Int32
VSFPROPID_GuidAutoActivate	= -5001,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9358,0)
32 10.0504 __VSFPROPID::VSFPROPID_CreateToolWinFlags Int32 -5002 0xFFFFEC76 -5002 System.Int32
VSFPROPID_CreateToolWinFlags	= -5002,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9359,0)
33 10.0504 __VSFPROPID::VSFPROPID_ExtWindowObject Int32 -5003 0xFFFFEC75 -5003 System.Int32
VSFPROPID_ExtWindowObject	= -5003,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9360,0)
34 10.0504 __VSFPROPID::VSFPROPID_MultiInstanceToolNum Int32 -5004 0xFFFFEC74 -5004 System.Int32
VSFPROPID_MultiInstanceToolNum	= -5004,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9361,0)
35 10.0504 __VSFPROPID::VSFPROPID_BitmapResource Int32 -5006 0xFFFFEC72 -5006 System.Int32
VSFPROPID_BitmapResource	= -5006,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9362,0)
36 10.0504 __VSFPROPID::VSFPROPID_BitmapIndex Int32 -5007 0xFFFFEC71 -5007 System.Int32
VSFPROPID_BitmapIndex	= -5007,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9363,0)
37 10.0504 __VSFPROPID::VSFPROPID_ToolbarHost Int32 -5008 0xFFFFEC70 -5008 System.Int32
VSFPROPID_ToolbarHost	= -5008,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9364,0)
38 10.0504 __VSFPROPID::VSFPROPID_HideToolwinContainer Int32 -5009 0xFFFFEC6F -5009 System.Int32
VSFPROPID_HideToolwinContainer	= -5009,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9365,0)
39 10.0504 __VSFPROPID::VSFPROPID_FIRST Int32 -5009 0xFFFFEC6F -5009 System.Int32
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\vsshell.h(9366,0)