Data Structures
struct	_MG_RWops

Macros
#define	MGUI_RWseek(ctx, offset, whence) (ctx)->seek(ctx, offset, whence)
	Seeks an MG_RWops object. More...

#define	MGUI_RWtell(ctx) (ctx)->seek(ctx, 0, SEEK_CUR)
	Obtains the current value of the position indicator for a data source. More...

#define	MGUI_RWread(ctx, ptr, size, n) (ctx)->read(ctx, ptr, size, n)
	Reads data blocks from a data source. More...

#define	MGUI_RWwrite(ctx, ptr, size, n) (ctx)->write(ctx, ptr, size, n)
	Writes data blocks to a data source. More...

#define	MGUI_RWclose(ctx) (ctx)->close(ctx)
	Closes an MG_RWops object. More...

#define	MGUI_RWeof(ctx) (ctx)->eof(ctx)
	Tests the end-of-file indicator for an data source. More...

Typedefs
typedef struct _MG_RWops	MG_RWops

Functions
MG_EXPORT MG_RWops *	MGUI_RWFromFile (const char file, const char mode)
	Creates an MG_RWops object from a file. More...

MG_EXPORT MG_RWops *	MGUI_RWFromFP (FILE *fp, int autoclose)
	Creates an MG_RWops object from an opened stdio FILE object. More...

MG_EXPORT MG_RWops *	MGUI_RWFromMem (void *mem, int size)
	Creates an MG_RWops object from a block of memory. More...

MG_EXPORT void	MGUI_InitMemRW (MG_RWops area, void mem, int size)
	Initializes an MG_RWops object from a block of memory. More...

MG_EXPORT MG_RWops *	MGUI_AllocRW (void)
	Allocates an uninitialized MG_RWops object. More...

MG_EXPORT void	MGUI_FreeRW (MG_RWops *area)
	Frees an MG_RWops object. More...

MG_EXPORT int	MGUI_RWgetc (MG_RWops *area)
	Reads the next character from an data source. More...

Detailed Description

MiniGUI's general read/write operation provides a general interface to read from and write to various data source, such as files, memory, and so on.

Macro Definition Documentation

#define MGUI_RWclose ( ctx ) (ctx)->close(ctx)

Closes an MG_RWops object.

This macro close the MG_RWops object pointed to by ctx.

Parameters

ctx	The pointer to the MG_RWops object.

Returns: Upon successful completion 0 is returned, otherwise non-zero on error.

See also: MGUI_RWread

Definition at line 336 of file endianrw.h.

#define MGUI_RWeof ( ctx ) (ctx)->eof(ctx)

Tests the end-of-file indicator for an data source.

This macro tests the end-of-file indicator for the data source pointed to by ctx.

Parameters

ctx	The pointer to the MG_RWops object.

Returns: Non-zero if end-of-file indicator is set.

See also: MGUI_RWtell

Definition at line 351 of file endianrw.h.

#define MGUI_RWread	(	ctx,
		ptr,
		size,
		n
	)	(ctx)->read(ctx, ptr, size, n)

Reads data blocks from a data source.

This macro reads up to n objects each of size size from the data source ctx to the area pointed to by ptr.

Parameters

ctx	The pointer to the MG_RWops object.
ptr	The buffer will save the data read.
size	The size of each object.
n	The number of objects to be read.

Returns: The number of objects read, or -1 if the read failed.

See also: MGUI_RWwrite

Definition at line 304 of file endianrw.h.

#define MGUI_RWseek	(	ctx,
		offset,
		whence
	)	(ctx)->seek(ctx, offset, whence)

Seeks an MG_RWops object.

This macro seeks to offset relative to whence.

Parameters

ctx	The pointer to the MG_RWops object.
offset	The offset relative to whence.
whence	One of stdio's whence values: - SEEK_SET\n the offset is relative to the start of the file. - SEEK_CUR\n the offset is relative to the current position indicator. - SEEK_END\n the offset is relative to the end of the file.

Returns: The final offset in the data source.

See also: MGUI_RWtell

Definition at line 272 of file endianrw.h.

#define MGUI_RWtell ( ctx ) (ctx)->seek(ctx, 0, SEEK_CUR)

Obtains the current value of the position indicator for a data source.

This macro obtains the current value of the position indicator for the data source pointed to by ctx.

Parameters

ctx	The pointer to the MG_RWops object.

Returns: The current value of the position indicator.

See also: MGUI_RWseek

Definition at line 287 of file endianrw.h.

#define MGUI_RWwrite	(	ctx,
		ptr,
		size,
		n
	)	(ctx)->write(ctx, ptr, size, n)

Writes data blocks to a data source.

This macro writes exactly n objects each of size size from the area pointed to by ptr to the data source ctx.

Parameters

ctx	The pointer to the MG_RWops object.
ptr	The buffer contains the data to be written.
size	The size of each object.
n	The number of objects to be written.

Returns: The number written, or -1 if the write failed.

See also: MGUI_RWread

Definition at line 321 of file endianrw.h.

Typedef Documentation

typedef struct _MG_RWops MG_RWops

The read/write operation structure.

Function Documentation

MG_RWops * MGUI_AllocRW ( void )

Allocates an uninitialized MG_RWops object.

This function allocates an uninitialized MG_RWops object. You can specify the fields of the structure, and implemente a customized MG_RWops object.

Returns: The pointer to allocated MG_RWops structure, NULL indicates error.

See also: MG_RWops

void MGUI_FreeRW ( MG_RWops * area )

Frees an MG_RWops object.

This function frees the MG_RWops object pointed to by area.

Parameters

area	The pointer to the MG_RWops object.

See also: MGUI_RWFromFile, MGUI_RWFromFP, MGUI_RWFromMem

void MGUI_InitMemRW	(	MG_RWops *	area,
		void *	mem,
		int	size
	)

Initializes an MG_RWops object from a block of memory.

This function initializes an MG_RWops object pointed to by area from a block of memory pointed to by mem, which is size bytes long.

Parameters

area	The pointer to the MG_RWops object.
mem	The pointer to the memory block.
size	The size of the memory block.

Returns: None.

See also: MG_RWops, MGUI_FreeRW, MGUI_RWFromMem

MG_RWops * MGUI_RWFromFile	(	const char *	file,
		const char *	mode
	)

Creates an MG_RWops object from a file.

This function uses the mode specified by mode and opens the file file by using stdio function fopen. If success, this function creates a MG_RWops object and returns it.

Parameters

file	The file name.
mode	The mode will be passed to fopen.

Returns: The pointer to created MG_RWops structure, NULL indicates error.

See also: MG_RWops, MGUI_RWFromFP, MGUI_FreeRW, fopen(3)

MG_RWops * MGUI_RWFromFP	(	FILE *	fp,
		int	autoclose
	)

Creates an MG_RWops object from an opened stdio FILE object.

This function uses an opened stdio FILE object fp to create a MG_RWops object.

Parameters

fp	The opened stdio FILE object.
autoclose	Indicates whether to close the FILE object when close method is called.

Returns: The pointer to created MG_RWops structure, NULL indicates error.

See also: MG_RWops, MGUI_RWFromFile, MGUI_FreeRW

MG_RWops * MGUI_RWFromMem	(	void *	mem,
		int	size
	)

Creates an MG_RWops object from a block of memory.

This function creates an MG_RWops object from a block of memory pointed to by mem, which is size bytes long.

Parameters

mem	The pointer to the memory block.
size	The size of the memory block.

Returns: The pointer to created MG_RWops structure, NULL indicates error.

See also: MG_RWops, MGUI_FreeRW

int MGUI_RWgetc ( MG_RWops * area )

Reads the next character from an data source.

This function reads the next character from the data source pointed to by area, and returns it as an unsigned char cast to an int, or EOF on end of file or error.

Parameters

area	The pointer to the MG_RWops object.

Returns: The character read, EOF indicates end-of-file or error.

See also: MGUI_RWread

Data Structures

Macros

Typedefs

Functions

Detailed Description

Macro Definition Documentation

Typedef Documentation

Function Documentation