libgphoto2 photo camera library (libgphoto2) API: libgphoto2_port/gphoto2/gphoto2-port-log.h File Reference

libgphoto2 photo camera library (libgphoto2) API 2.5.33

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gphoto2-port-log.h File Reference
`#include <stdarg.h>`
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## Macros
#define | GP_LOG_ALL GP_LOG_DATA

## Typedefs
typedef void(* | GPLogFunc) (GPLogLevel level, const char *domain, const char *str, void *data)
| Logging function hook.

## Enumerations
enum | GPLogLevel { GP_LOG_ERROR = 0 , GP_LOG_VERBOSE = 1 , GP_LOG_DEBUG = 2 , GP_LOG_DATA = 3 }
| Logging level Specifies the logging severity level. More...

## Functions
int | gp_log_add_func (GPLogLevel level, GPLogFunc func, void *data)
| Add a function to get logging information.
int | gp_log_remove_func (int id)
| Remove a logging receiving function.
void | gp_log (GPLogLevel level, const char *domain, const char *format,...)
| Log a debug or error message.
void | gp_log_with_source_location (GPLogLevel level, const char *file, int line, const char *func, const char *format,...)
void | gp_logv (GPLogLevel level, const char *domain, const char *format, va_list args)
| Log a debug or error message with va_list.
void | gp_log_data (const char *domain, const char *data, unsigned int size, const char *format,...)
| Log data.

## Detailed Description

Copyright 2001 Lutz Mueller lutz@.nosp@m.user.nosp@m.s.sf..nosp@m.net

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

## Macro Definition Documentation

## ◆ GP_LOG_ALL

#define GP_LOG_ALL GP_LOG_DATA

GP_LOG_ALL:

Used by frontends if they want to be sure their callback function receives all messages. Defined as the highest debug level. Can make frontend code more understandable and extension of log levels easier.

## Typedef Documentation

## ◆ GPLogFunc

typedef void(* GPLogFunc) (GPLogLevel level, const char *domain, const char *str, void *data)

Logging function hook.

This is the function frontends can use to receive logging information from the libgphoto2 framework. It is set using gp_log_add_func() and removed using gp_log_remove_func() and will then receive the logging messages of the level specified.

Parameters

  level | the log level of the passed message, as set by the camera driver or libgphoto2
  domain | the logging domain as set by the camera driver, or libgphoto2 function
  str | the logmessage, without linefeed
  data | the caller private data that was passed to gp_log_add_func()

## Enumeration Type Documentation

## ◆ GPLogLevel

enum GPLogLevel

Logging level Specifies the logging severity level.

Enumerator
GP_LOG_ERROR | Log message is an error information.
GP_LOG_VERBOSE | Log message is an verbose debug information.
GP_LOG_DEBUG | Log message is an debug information.
GP_LOG_DATA | Log message is a data hex dump.

## Function Documentation

## ◆ gp_log()

void gp_log | ( | GPLogLevel | level,
|  | const char * | domain,
|  | const char * | format,
|  |  | ... )

Log a debug or error message.

Parameters

  level | gphoto2 log level
  domain | the log domain
  format | a printf style format string
  ... | the variable argumentlist for above format string

Logs a message at the given log level. You would normally use this function to log general debug output in a printf way.

References gp_logv().

Referenced by gp_bayer_expand(), gp_init_localedir(), gp_log_data(), gp_port_check_int(), gp_port_check_int_fast(), gp_port_init_localedir(), gp_port_read(), gp_port_usb_msg_class_read(), gp_port_usb_msg_interface_read(), gp_port_usb_msg_read(), and gp_port_write().

## ◆ gp_log_add_func()

int gp_log_add_func | ( | GPLogLevel | level,
|  | GPLogFunc | func,
|  | void * | data )

Add a function to get logging information.

Parameters

  level | the maximum level of logging it will get, up to and including the passed value
  func | a GPLogFunc
  data | data

Adds a log function that will be called for each log message that is flagged with a log level that appears in given log level. This function returns an id that you can use for removing the log function again (using gp_log_remove_func).

Returns
  an id or a gphoto2 error code

## ◆ gp_log_data()

void gp_log_data | ( | const char * | domain,
|  | const char * | data,
|  | unsigned int | size,
|  | const char * | format,
|  |  | ... )

Log data.

domain the domain

data the data to be logged

size the size of the data

Takes the data and creates a formatted hexdump string. If you would like to log text messages, use gp_log instead.

References gp_log(), GP_LOG_DATA, HEXDUMP_COMPLETE_LINE, HEXDUMP_INIT_X, HEXDUMP_INIT_Y, and HEXDUMP_LINE_WIDTH.

## ◆ gp_log_remove_func()

int gp_log_remove_func | ( | int | id | ) |

Remove a logging receiving function.

Parameters

  id | an id (return value of gp_log_add_func)

Removes the log function with given id.

Returns
  a gphoto2 error code

References GP_ERROR_BAD_PARAMETERS, and GP_OK.

## ◆ gp_logv()

void gp_logv | ( | GPLogLevel | level,
|  | const char * | domain,
|  | const char * | format,
|  | va_list | args )

Log a debug or error message with va_list.

Parameters

  level | gphoto2 log level
  domain | the domain
  format | the format
  args | the va_list corresponding to format

Logs a message at the given log level. You would normally use this function to log as yet unformatted strings.

Referenced by gp_log().