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 10.04025 __magnumdb__enum_msouser_h_8::msoimodUser Int32 0 0x00000000 0 System.Int32
msoimodUser,		// System User
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1171,0)
2 10.04025 __magnumdb__enum_msouser_h_8::msoimodGdi Int32 1 0x00000001 1 System.Int32
msoimodGdi,			// System GDI
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1172,0)
3 10.04025 __magnumdb__enum_msouser_h_8::msoimodWinnls Int32 2 0x00000002 2 System.Int32
msoimodWinnls,		// System International utilities
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1173,0)
4 10.04025 __magnumdb__enum_msouser_h_8::msoimodShell Int32 3 0x00000003 3 System.Int32
msoimodShell,		// System Shell
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1176,0)
5 10.04025 __magnumdb__enum_msouser_h_8::msoimodCommctrl Int32 4 0x00000004 4 System.Int32
msoimodCommctrl,	// System Common controls
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1177,0)
6 10.04025 __magnumdb__enum_msouser_h_8::msoimodOleAuto Int32 5 0x00000005 5 System.Int32
msoimodOleAuto,		// System OLE automation
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1178,0)
7 10.04025 __magnumdb__enum_msouser_h_8::msoimodCommdlg Int32 6 0x00000006 6 System.Int32
msoimodCommdlg,		// System common dialogs
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1179,0)
8 10.04025 __magnumdb__enum_msouser_h_8::msoimodVersion Int32 7 0x00000007 7 System.Int32
msoimodVersion,		// System version APIs
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1180,0)
9 10.04025 __magnumdb__enum_msouser_h_8::msoimodWinmm Int32 8 0x00000008 8 System.Int32
msoimodWinmm,		// System multimedia
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1181,0)
10 10.04025 __magnumdb__enum_msouser_h_8::msoimodMapi Int32 9 0x00000009 9 System.Int32
msoimodMapi,		// Mail
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1182,0)
11 10.04025 __magnumdb__enum_msouser_h_8::msoimodHlink Int32 10 0x0000000A 10 System.Int32
msoimodHlink,		// Hyperlink APIs
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1183,0)
12 10.04025 __magnumdb__enum_msouser_h_8::msoimodUrlmon Int32 11 0x0000000B 11 System.Int32
msoimodUrlmon,		// Url moniker APIs
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1184,0)
13 10.04025 __magnumdb__enum_msouser_h_8::msoimodJet Int32 12 0x0000000C 12 System.Int32
msoimodJet,			// Jet database
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1185,0)
14 10.04025 __magnumdb__enum_msouser_h_8::msoimodOleAcc Int32 13 0x0000000D 13 System.Int32
msoimodOleAcc,		// OLE Accessibility
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1186,0)
15 10.04025 __magnumdb__enum_msouser_h_8::msoimodWinsock Int32 14 0x0000000E 14 System.Int32
msoimodWinsock,		// Network Sockets
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1187,0)
16 10.04025 __magnumdb__enum_msouser_h_8::msoimodMpr Int32 15 0x0000000F 15 System.Int32
msoimodMpr,			// Windows Network
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1188,0)
17 10.04025 __magnumdb__enum_msouser_h_8::msoimodOdma Int32 16 0x00000010 16 System.Int32
msoimodOdma,		// odma
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1189,0)
18 10.04025 __magnumdb__enum_msouser_h_8::msoimodWininet Int32 17 0x00000011 17 System.Int32
msoimodWininet,		// internet stuff
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1190,0)
19 10.04025 __magnumdb__enum_msouser_h_8::msoimodRpcrt4 Int32 18 0x00000012 18 System.Int32
msoimodRpcrt4,		// RPC
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1191,0)
20 10.04025 __magnumdb__enum_msouser_h_8::msoimodDarwin Int32 19 0x00000013 19 System.Int32
msoimodDarwin,		// Darwin
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1192,0)
21 10.04025 __magnumdb__enum_msouser_h_8::msoimodCrypt32 Int32 20 0x00000014 20 System.Int32
msoimodCrypt32,	// crypto dll - digital signing
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1193,0)
22 10.04025 __magnumdb__enum_msouser_h_8::msoimodWintrust Int32 21 0x00000015 21 System.Int32
msoimodWintrust,	// wintrust.dll - digital signing
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1194,0)
23 10.04025 __magnumdb__enum_msouser_h_8::msoimodCryptdlg Int32 22 0x00000016 22 System.Int32
msoimodCryptdlg,	// cryptdlg.dll - digital signing
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1195,0)
24 10.04025 __magnumdb__enum_msouser_h_8::msoimodSigner Int32 23 0x00000017 23 System.Int32
msoimodSigner,		// signer.dll - digital signing
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1196,0)
25 10.04025 __magnumdb__enum_msouser_h_8::msoimodSoftpub Int32 24 0x00000018 24 System.Int32
msoimodSoftpub,	// softpub.dll - digital signing
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1197,0)
26 10.04025 __magnumdb__enum_msouser_h_8::msoimodAdvapi32 Int32 25 0x00000019 25 System.Int32
msoimodAdvapi32,	// advapi32.dll - digital signing
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1198,0)
27 10.04025 __magnumdb__enum_msouser_h_8::msoimodVbe Int32 26 0x0000001A 26 System.Int32
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1199,0)
28 10.04025 __magnumdb__enum_msouser_h_8::msoimodRichEdit Int32 27 0x0000001B 27 System.Int32
msoimodRichEdit,    // Richedit dll
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1200,0)
29 10.04025 __magnumdb__enum_msouser_h_8::msoimodMsoHev Int32 28 0x0000001C 28 System.Int32
msoimodMsoHev,		// Msohev.dll
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1201,0)
30 10.04025 __magnumdb__enum_msouser_h_8::msoimodMssign32 Int32 29 0x0000001D 29 System.Int32
msoimodMssign32,	// mssign32.dll - digital signing
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1202,0)
31 10.04025 __magnumdb__enum_msouser_h_8::msoimodOlepro32 Int32 30 0x0000001E 30 System.Int32
msoimodOlepro32,    // olepro32.dll - OleCreateFontIndirect & OldCreatePictureIndirect
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1203,0)
32 10.04025 __magnumdb__enum_msouser_h_8::msoimodCryptui Int32 31 0x0000001F 31 System.Int32
msoimodCryptui,	// cryptui.dll - IE5 digital signing
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1204,0)
33 10.04025 __magnumdb__enum_msouser_h_8::msoimodIE5Crypt32 Int32 32 0x00000020 32 System.Int32
msoimodIE5Crypt32,	// IE5 crypto dll - digital signing
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1205,0)
34 10.04025 __magnumdb__enum_msouser_h_8::msoimodWinspool Int32 33 0x00000021 33 System.Int32
msoimodWinspool,    // winspool.drv
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1206,0)
35 10.04025 __magnumdb__enum_msouser_h_8::msoimodKernel32 Int32 34 0x00000022 34 System.Int32
msoimodKernel32,    // kernel32.dll
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1207,0)
36 10.04025 __magnumdb__enum_msouser_h_8::msoimodShlwapi Int32 35 0x00000023 35 System.Int32
msoimodShlwapi,		// shlwapi.dll
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1208,0)
37 10.04025 __magnumdb__enum_msouser_h_8::msoimodActiveds Int32 36 0x00000024 36 System.Int32
msoimodActiveds,        // activeds.dll - Active Directory dll
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1209,0)
38 10.04025 __magnumdb__enum_msouser_h_8::msoimodWFF Int32 37 0x00000025 37 System.Int32
msoimodWFF,         // ippwff.dll - IWebFolderForms dll
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1210,0)
39 10.04025 __magnumdb__enum_msouser_h_8::msoimodNetapi32 Int32 38 0x00000026 38 System.Int32
msoimodNetapi32,        // netapi32.dll - Network API
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1211,0)
40 10.04025 __magnumdb__enum_msouser_h_8::msoimodWtsapi32 Int32 39 0x00000027 39 System.Int32
msoimodWtsapi32,	// WTS Api's
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1212,0)
41 10.04025 __magnumdb__enum_msouser_h_8::msoimodMscat32 Int32 40 0x00000028 40 System.Int32
msoimodMscat32,     // mscat32.dll - digital signing
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1213,0)
42 10.04025 __magnumdb__enum_msouser_h_8::msoimodMax Int32 41 0x00000029 41 System.Int32
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VSSDK\VisualStudioIntegration\Common\Inc\office10\msouser.h(1214,0)