mlib::asset Class Reference

Class for storing asset files in Windows resource data. More...

#include <asset.h>

Public Member Functions
	asset (int id_, const std::filesystem::path &name_=std::filesystem::path(), bool persist=false)
	Constructor for an asset object.
	~asset ()
	Destructor. Delete asset file if it exists and is not persistent.
const void *	data ()
	Load asset data and return a pointer to it.
size_t	size ()
	Return size of asset data or 0 if asset could not be loaded.
bool	write (const std::filesystem::path &root_path)
	Write the asset to a folder.
bool	remove ()
	Delete asset file from disk.

Public Attributes
std::filesystem::path	name
	Relative asset name.

Detailed Description

Class for storing asset files in Windows resource data.

This class provides a mechanism for embedding different "assets" like those needed by a HTTP server (pages, CSS files, images, etc.), inside a Windows executable or DLL.

Each asset is stored as a user-defined resource of type RESFILE (defined as 256) and is identified by its ID. An asset can be written to a file. When the asset object goes out of scope the file is deleted.

Sample Usage

The resource file (.rc):

IDR_INDEX_HTML RESFILE  "index.html"
IDR_MAIN_CSS   RESFILE  "main.css"

Program file:

  mlib::asset page (IDR_INDEX_HTML, "web/index.html");
  mlib::asset css (IDR_MAIN_CSS, "web/css/main.css");
//....
  page.write ("C:\\temp");
  css.write ("C:\\temp");

This has created the file c:\temp\web\index.html and c:\temp\web\css\main.css. When the variables page and css go out of scope, the two files will be deleted (however, the directory structure remains in place).

Constructor & Destructor Documentation

asset()

mlib::asset::asset ( int id_, const std::filesystem::path & name_ = std::filesystem::path (), bool persist = false )

inline

Constructor for an asset object.

Parameters

name_	asset file name
id_	resource ID
persist	if true do not delete disk file when asset object is destructed

Member Function Documentation

data()

const void * mlib::asset::data ( )

inline

Load asset data and return a pointer to it.

Returns

pointer to asset data or 0 if an error occurs.

remove()

bool mlib::asset::remove ( )

inline

Delete asset file from disk.

Note

File is deleted even if it is a persistent asset.

Returns

true if file was deleted

false if file was not written or doesn't exist

size()

size_t mlib::asset::size ( )

inline

Return size of asset data or 0 if asset could not be loaded.

Returns

size of asset (in bytes)

write()

bool mlib::asset::write

(

const std::filesystem::path &

path

)

Write the asset to a folder.

Parameters

path	root path for asset file

Returns

true if successful, false otherwise

Asset filename is obtained by appending the asset name to the root path. For persistent assets, if file already exists, it is not overwritten.

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The documentation for this class was generated from the following files:

• include/mlib/asset.h
• src/asset.cpp