Context callback operation functions. More...

#include <stdarg.h>

Include dependency graph for gphoto2-context.h:

This graph shows which files directly or indirectly include this file:

Typedefs
typedef struct _GPContext	GPContext
	The gphoto context structure. More...

typedef enum _GPContextFeedback	GPContextFeedback
	Return codes that can be returned by progress handling. More...

typedef void(*	GPContextIdleFunc) (GPContext context, void data)

typedef void(*	GPContextErrorFunc) (GPContext context, const char text, void *data)

typedef void(*	GPContextStatusFunc) (GPContext context, const char text, void *data)

typedef void(*	GPContextMessageFunc) (GPContext context, const char text, void *data)

typedef GPContextFeedback(*	GPContextQuestionFunc) (GPContext context, const char text, void *data)

typedef GPContextFeedback(*	GPContextCancelFunc) (GPContext context, void data)

typedef unsigned int(*	GPContextProgressStartFunc) (GPContext context, float target, const char text, void *data)

typedef void(*	GPContextProgressUpdateFunc) (GPContext context, unsigned int id, float current, void data)

typedef void(*	GPContextProgressStopFunc) (GPContext context, unsigned int id, void data)

Enumerations
enum	_GPContextFeedback { GP_CONTEXT_FEEDBACK_OK, GP_CONTEXT_FEEDBACK_CANCEL }
	Return codes that can be returned by progress handling. More...

Functions
GPContext *	gp_context_new (void)
	Creates a new context. More...

void	gp_context_ref (GPContext *context)

void	gp_context_unref (GPContext *context)
	Decrements reference count of a context. More...

void	gp_context_set_idle_func (GPContext context, GPContextIdleFunc func, void data)

void	gp_context_set_progress_funcs (GPContext context, GPContextProgressStartFunc start_func, GPContextProgressUpdateFunc update_func, GPContextProgressStopFunc stop_func, void data)

void	gp_context_set_error_func (GPContext context, GPContextErrorFunc func, void data)

void	gp_context_set_status_func (GPContext context, GPContextStatusFunc func, void data)

void	gp_context_set_question_func (GPContext context, GPContextQuestionFunc func, void data)

void	gp_context_set_cancel_func (GPContext context, GPContextCancelFunc func, void data)

void	gp_context_set_message_func (GPContext context, GPContextMessageFunc func, void data)

void	gp_context_idle (GPContext *context)
	Notify frontend of a brief idle time. More...

void	gp_context_error (GPContext context, const char format,...)

void	gp_context_status (GPContext context, const char format,...)

void	gp_context_message (GPContext context, const char format,...)
	Print a message to the context. More...

GPContextFeedback	gp_context_question (GPContext context, const char format,...)
	Ask frontend user a question. More...

GPContextFeedback	gp_context_cancel (GPContext *context)

unsigned int	gp_context_progress_start (GPContext context, float target, const char format,...)
	Start progress tracking. More...

void	gp_context_progress_update (GPContext *context, unsigned int id, float current)

void	gp_context_progress_stop (GPContext *context, unsigned int id)

Detailed Description

Context callback operation functions.

Author: Copyright 2001 Lutz Mueller lutz@.nosp@m.user.nosp@m.s.sou.nosp@m.rcef.nosp@m.orge..nosp@m.net

Note: This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.; This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.; You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

Typedef Documentation

typedef struct _GPContext GPContext

The gphoto context structure.

This structure allows callback handling, passing error contexts back, progress handling and download cancellation and similar things. It is usually passed around the functions.

typedef enum _GPContextFeedback GPContextFeedback

Return codes that can be returned by progress handling.

An application can return special values back to the libgphoto2 progress callback handling functions. If "Cancel" is selected, libgphoto2 and the camera driver will try to cancel transfer.

Enumeration Type Documentation

enum _GPContextFeedback

Return codes that can be returned by progress handling.

An application can return special values back to the libgphoto2 progress callback handling functions. If "Cancel" is selected, libgphoto2 and the camera driver will try to cancel transfer.

Enumerator
GP_CONTEXT_FEEDBACK_OK	Everything ok... proceed.
GP_CONTEXT_FEEDBACK_CANCEL	Please cancel the current transfer if possible.

Function Documentation

GPContextFeedback gp_context_cancel ( GPContext * context )

gp_context_cancel: : a GPContext

Gives the frontend the possibility to cancel the current operation that is executed in this .

Return value: a GPContextFeedback.

References GP_CONTEXT_FEEDBACK_OK.

void gp_context_idle ( GPContext * context )

Notify frontend of a brief idle time.

Tells the frontend that it can do other processing at this moment, like refresh the UI. Backends should call this function every time when an interruption of the transfer is possible.

Parameters

context a GPContext

void gp_context_message	(	GPContext *	context,
		const char *	format,
			...
	)

Print a message to the context.

This sends a message to the passed context, to be printed by it in some kind of way, but do no other action.

To be used by camera drivers.

Parameters

context	A GPContext
format	A sprintf style format string
...	variable argument list depending on format string

GPContext* gp_context_new ( void )

Creates a new context.

To be used by the frontend.

Returns: a GPContext.

unsigned int gp_context_progress_start	(	GPContext *	context,
		float	target,
		const char *	format,
			...
	)

Start progress tracking.

This function starts up a new progress tracking for a specified context. Several nested progress reports can happen at once, depending on the backend.

Parameters

context	The context in which to start the progress.
target	The 100% value.
format	A sprintf style string to print out, including the following variable arguments.

References gp_log(), and GP_LOG_ERROR.

GPContextFeedback gp_context_question	(	GPContext *	context,
		const char *	format,
			...
	)

Ask frontend user a question.

Asks the user a question that he must answer either with "Ok" or "Cancel".

To be used by a camera driver. (So far no camera driver is using it, but this might change later.)

Parameters

context	a GPContext
format	a sprintf format string
...	variable arguments for format string

Returns: The user's answer in form of a GPContextFeedback.

References GP_CONTEXT_FEEDBACK_OK.

void gp_context_ref ( GPContext * context )

Increments the reference count of the context.

Parameters

context The context to bump the reference

void gp_context_unref ( GPContext * context )

Decrements reference count of a context.

Decrement the reference count of a context and free if it goes to 0.

Parameters

context The context to drop the reference count.

Typedefs

Enumerations

Functions

Detailed Description

Typedef Documentation

Enumeration Type Documentation

Function Documentation