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RESOURCEHEADER Overview  Group

The RESOURCEHEADER structure contains information about the resource header itself and the data specific to this resource. This structure is not a true C-language structure, because it contains variable-length members. This structure was created solely to depict data organization in the resource file and does not appear in any of the header files shipped with the Microsoft Platform Software Development Kit (SDK).

struct RESOURCEHEADER { 

    DWORD DataSize; 

    DWORD HeaderSize; 

    [Ordinal or name TYPE]; 

    [Ordinal or name NAME]; 

    DWORD DataVersion; 

    WORD MemoryFlags; 

    WORD LanguageId; 

    DWORD Version; 

    DWORD Characteristics; 

}; 

 

Members

DataSize
Specifies the size, in bytes, of the data that follows the resource header for this particular resource. It does not include any file padding between this resource and any resource that follows it in the resource file.
HeaderSize
Specifies the size, in bytes, of the resource header data that follows.
TYPE
Identifies the resource type. The TYPE member can either be a numeric value or a null-terminated Unicode string that specifies the name of the type. See the following Remarks section for a description of Name or Ordinal type members.

If the TYPE member is a numeric value, it can specify either a standard or a user-defined resource type. If the member is a string, then it is a user-defined resource type.

Following are the standard Windows resource types.

Resource Type Name

Type number

RT_CURSOR

1

RT_BITMAP

2

RT_ICON

3

RT_MENU

4

RT_DIALOG

5

RT_STRING

6

RT_FONTDIR

7

RT_FONT

8

RT_ACCELERATOR

9

RT_RCDATA

10

RT_MESSAGETABLE

11

RT_GROUP_CURSOR

12

RT_GROUP_ICON

14

RT_VERSION

16

RT_DLGINCLUDE

17

RT_PLUGPLAY

19

RT_VXD

20

RT_ANICURSOR

21

RT_ANIICON

22

Values less than 256 are reserved for system use.

NAME
Specifies a name that identifies the particular resource. The NAME member, like the TYPE member, can either be a numeric value or a null-terminated Unicode string. See the following Remarks section for a description of Name or Ordinal type members.

You do not need to add padding for DWORD alignment between the TYPE and NAME members because they contain WORD data. However, you may need to add a WORD of padding after the NAME member to align the rest of the header on DWORD boundaries.

DataVersion
Specifies a predefined resource data version. This will determine which version of the resource data the application should use.
MemoryFlags
Specifies a set of attribute flags that can describe the state of the resource. Modifiers in the .RC script file assign these attributes to the resource. The script identifiers can assign the following flag values.

Flag description

Value

MOVEABLE

0x0010

FIXED

~MOVEABLE

PURE

0x0020

IMPURE

~PURE

PRELOAD

0x0040

LOADONCALL

~PRELOAD

DISCARDABLE

0x1000

The only attribute a Win32-based application uses is the DISCARDABLE attribute. The remaining attributes are permitted in the script for compatibility with existing scripts, but they are ignored.

The resource compiler for Windows NT always ignores the MOVEABLE, IMPURE, and PRELOAD attribute flags. See Resource-Definition Statements for additional information about resource attributes.

LanguageId
Specifies the language for the resource or set of resources. Set the value for this member with the optional LANGUAGE Statement resource definition statement. The parameters are constants from the WINNT.H file.

Each resource includes a language identifier so the system or application can select a language appropriate for the current locale of the system. If there are multiple resources of the same type and name that differ only in the language of the strings within the resources, you will need to specify a LanguageId for each one.

Version
Specifies a user-defined version number for the resource data that tools can use to read and write resource files. Set this value with the optional VERSION resource definition statement.
Characteristics
Specifies user-defined information about the resource that tools can use to read and write resource files. Set this value with the optional CHARACTERISTICS resource definition statement.

Remarks

A variable type member is called a Name or Ordinal member, and it is used in most places in the resource file where an identifier appears. The first WORD of a Name or Ordinal type member indicates whether the member is a numeric value or a string. If the first WORD in the member is equal to the value 0xffff, which is an invalid Unicode character, then the following WORD is a type number. Otherwise, the member contains a Unicode string and the first WORD in the member is the first character in the name string. For additional information about resource definition statements see Single-Line Statements and Multiline Statements. 

See Also

CHARACTERISTICS Statement, LANGUAGE Statement, VERSION Statement

See also:


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