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Difference between revisions of "EXIF"

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== gflBitmapHasEXIF ==
>== gflBitmapHasEXIF ==


The gflBitmapHasEXIF function is used to know if the picture has EXIF metadata.  
The gflBitmapHasEXIF function is used to know if the picture has EXIF metadata.  


  GFL_BOOL <b>gflBitmapHasEXIF</b>(
  GFL_BOOL &lt;b&gt;gflBitmapHasEXIF&lt;/b&gt;(
   const GFL_BITMAP* bitmap
   const GFL_BITMAP* bitmap
  );
  );
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'''See also'''
'''See also'''
:[[IPTC#gflBitmapHasIPTC|gflBitmapHasIPTC]], [[ICC#gflBitmapHasICCProfile|gflBitmapHasICCProfile]], [[#gflBitmapGetEXIF|gflBitmapGetEXIF]], [[#gflFreeEXIF|gflFreeEXIF]], [[#gflBitmapRemoveEXIFThumbnail|gflBitmapRemoveEXIFThumbnail]], [[Misc#gflBitmapRemoveMetaData|gflBitmapRemoveMetaData]]
:[[IPTC#gflBitmapHasIPTC|gflBitmapHasIPTC]], [[ICC#gflBitmapHasICCProfile|gflBitmapHasICCProfile]], [[#gflBitmapGetEXIF|gflBitmapGetEXIF]], [[#gflFreeEXIF|gflFreeEXIF]], [[#gflBitmapRemoveEXIFThumbnail|gflBitmapRemoveEXIFThumbnail]], [[Misc#gflBitmapRemoveMetaData|gflBitmapRemoveMetaData]]
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== gflBitmapGetEXIF ==
== gflBitmapGetEXIF ==

Revision as of 02:46, 18 November 2010

>== gflBitmapHasEXIF ==

The gflBitmapHasEXIF function is used to know if the picture has EXIF metadata. 

GFL_BOOL <b>gflBitmapHasEXIF</b>(
  const GFL_BITMAP* bitmap
);

Parameters

bitmap
Pointer to a GFL_BITMAP structure.

Return value

The function returns GFL_TRUE if the bitmap has EXIF metadata.

See also

gflBitmapHasIPTC, gflBitmapHasICCProfile, gflBitmapGetEXIF, gflFreeEXIF, gflBitmapRemoveEXIFThumbnail, gflBitmapRemoveMetaData

gflBitmapGetEXIF

The gflBitmapGetEXIF function returns EXIF metadata in a readable form. 

GFL_EXIF_DATA* gflBitmapGetEXIF(
  const GFL_BITMAP* bitmap,  
  GFL_UINT32  flags
);

Parameters

bitmap
Pointer to a GFL_BITMAP structure.
flags
GFL_EXIF_WANT_MAKERNOTES 0x0001

Return value

The function returns a pointer to a GFL_EXIF_DATA structure.

See also

gflBitmapHasEXIF, gflFreeEXIF

gflFreeEXIF

The gflFreeEXIF function frees memory allocated by gflBitmapGetEXIF function. 

void gflFreeEXIF(
  GFL_EXIF_DATA* exif_data
);

Parameters

exif_data
Pointer to a GFL_EXIF_DATA structure.

See also

gflBitmapHasEXIF, gflBitmapGetEXIF


gflBitmapGetEXIFValue

The gflBitmapGetEXIFValue allows to get a tag from EXIF metadata. 

GFL_ERROR gflBitmapGetEXIFValue(
  const GFL_BITMAP* bitmap, 
  GFL_UINT32 tag, 
  char* value, 
  GFL_INT32 value_length
);

Parameters

bitmap
Pointer to a GFL_BITMAP structure
tag
EXIF tag
value
Pointer to the first element of a char array (C string)
value_length
Maximum length of the string

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.

See also

gflBitmapHasEXIF

gflBitmapRemoveEXIFThumbnail

The gflBitmapRemoveEXIFThumbnail function removes thumbnail from EXIF metadata. 

void gflBitmapRemoveEXIFThumbnail(
  GFL_BITMAP* bitmap
);

Parameters

bitmap
Pointer to a GFL_BITMAP structure.

See also

gflBitmapHasEXIF, gflBitmapRemoveMetaData

gflBitmapGetEXIF2

The gflBitmapGetEXIF2 function returns EXIF metadata in a readable form. 

GFL_EXIF_DATAEX* gflBitmapGetEXIF2( 
  const GFL_BITMAP* bitmap 
);

Parameters

bitmap
Pointer to a GFL_BITMAP structure.

Return value

The function returns a pointer to a GFL_EXIF_DATAEX structure.


gflFreeEXIF2

The gflFreeEXIF2 function frees memory allocated by gflBitmapGetEXIF2 function. 

void gflFreeEXIF2( 
  GFL_EXIF_DATAEX* exif_data 
);

Parameters

exif_data
Pointer to a GFL_EXIF_DATAEX structure.


gflBitmapSetEXIF2

The gflBitmapSetEXIF2 function sets EXIF metadata to a bitmap. 

void gflBitmapSetEXIF2( 
  GFL_BITMAP* bitmap, 
  const GFL_EXIF_DATAEX* exif_data 
);

Parameters

bitmap
Pointer to a GFL_BITMAP structure.
exif_data
Pointer to a GFL_EXIF_DATAEX structure.


gflBitmapSetEXIFValueString2

The gflBitmapSetEXIFValueString2 function sets a string for a tag. 

void gflBitmapSetEXIFValueString2( 
  GFL_EXIF_DATAEX* exif_data, 
  GFL_UINT16 ifd, 
  GFL_UINT16 tag, 
  const char* value 
);

Parameters

exif_data
Pointer to a GFL_EXIF_DATAEX structure.
ifd
IFD of the tag
tag
Tag to set
value
Pointer to a null-terminated string that contains the value.

gflBitmapSetEXIFValueInt2

void gflBitmapSetEXIFValueInt2( 
  GFL_EXIF_DATAEX* exif_data, 
  GFL_UINT16 ifd, 
  GFL_UINT16 tag, 
  GFL_UINT32 format, 
  GFL_UINT32 value 
);

Parameters

exif_data
Pointer to a GFL_EXIF_DATAEX structure.
ifd
IFD of the tag
tag
Tag to set
format
Format of the int value
value
Integer value

gflBitmapSetEXIFValueRational2

void gflBitmapSetEXIFValueRational2( 
  GFL_EXIF_DATAEX* exif_data, 
  GFL_UINT16 ifd, 
  GFL_UINT16 tag, 
  GFL_UINT32 p, 
  GFL_UINT32 q 
);

Parameters

exif_data
Pointer to a GFL_EXIF_DATAEX structure.
ifd
IFD of the tag
tag
Tag to set
p
Numerator
q
Denominator

gflBitmapSetEXIFValueRationalArray2

void gflBitmapSetEXIFValueRationalArray2( 
  GFL_EXIF_DATAEX* exif_data, 
  GFL_UINT16 ifd, 
  GFL_UINT16 tag, 
  const GFL_UINT32* pq, 
  GFL_INT32 count 
);

Parameters

exif_data
Pointer to a GFL_EXIF_DATAEX structure.
ifd
IFD of the tag
tag
Tag to set
pq
Pointer to the first element of an array of numerator-denominator
count
Number of rational values
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