The Canon driver reference | |||
---|---|---|---|
<<< Previous Page | Home | Up | Next Page >>> |
#include <canon.h> #define IS_EOS (cam) #define CHECK_PARAM_NULL (param) #define CON_CHECK_PARAM_NULL (param) #define GP_PORT_DEFAULT #define GP_PORT_DEFAULT_RETURN (RETVAL) #define GP_PORT_DEFAULT_RETURN_EMPTY #define GP_PORT_DEFAULT_RETURN_INTERNAL (return_statement) enum canonJpegMarkerCode; enum canonDownloadImageType; #define GP_MODULE |
#define IS_EOS(cam) |
Checks whether to treat camera as an EOS model; differences in key lock/unlock, no "get picture abilities", different interrupt sequence on remote capture. Returns: 1 if camera is treated as EOS, 0 if otherwise.
Treat PS 230 as EOS just as a guess; I really don't know.
cam : | camera type from camera->pl->md->model |
#define CHECK_PARAM_NULL(param) |
Checks if the given parameter is NULL. If so, returns GP_ERROR_BAD_PARAMETERS from the enclosing function.
param : | value to check for NULL |
#define CON_CHECK_PARAM_NULL(param) |
Checks if the given parameter is NULL. If so, reports through gp_context_error() (assuming that "context" is defined) and returns GP_ERROR_BAD_PARAMETERS from the enclosing function.
param : | value to check for NULL |
#define GP_PORT_DEFAULT GP_PORT_DEFAULT_RETURN(GP_ERROR_BAD_PARAMETERS) |
Return as a default case in switch (camera->port->type) statements in functions returning a gphoto2 error code where this value of camera->port->type is unexpected.
#define GP_PORT_DEFAULT_RETURN(RETVAL) GP_PORT_DEFAULT_RETURN_INTERNAL(return RETVAL) |
Return as a default case in switch (camera->port->type) statements in functions returning a value.
RETVAL : | Value to return from this function |
#define GP_PORT_DEFAULT_RETURN_EMPTY GP_PORT_DEFAULT_RETURN_INTERNAL(return) |
Return as a default case in switch (camera->port->type) statements in functions returning void.
#define GP_PORT_DEFAULT_RETURN_INTERNAL(return_statement) |
Used only by GP_PORT_DEFAULT_RETURN_EMPTY(), GP_PORT_DEFAULT_RETURN(), and GP_PORT_DEFAULT()
return_statement : | Statement to use for return |
typedef enum { JPEG_ESC = 0xFF, JPEG_BEG = 0xD8, JPEG_SOS = 0xDB, JPEG_A50_SOS = 0xC4, JPEG_END = 0xD9 } canonJpegMarkerCode; |
Flags to find important points in JFIF or EXIF files
JPEG_ESC | Byte value to flag possible JPEG code. |
JPEG_BEG | Byte value which, immediately after JPEG_ESC, marks the start of JPEG image data in a JFIF file. |
JPEG_SOS | Byte value to flag a JPEG SOS marker. |
JPEG_A50_SOS | Byte value to flag a JPEG SOS marker in a file from a PowerShot A50 camera. |
JPEG_END | Byte code to mark the end of a JPEG image? |
typedef enum { CANON_DOWNLOAD_THUMB = 1, CANON_DOWNLOAD_FULL = 2 } canonDownloadImageType; |
Codes for "Download Captured Image" command to tell the camera to download either the thumbnail or the full image for the most recently captured image.
CANON_DOWNLOAD_THUMB | Get just the thumbnail for the image |
CANON_DOWNLOAD_FULL | Get the full image |