Gets all the TIFF Geo keys stored in a file.


#include "ltwrappr.h"

L_INT LFile::ReadGeoKeys(uFlags, puGeoKeyCount, ppGeoKeys, puDataSize, ppData, pLoadOptions)


L_UINT uFlags

Flag that determines whether to read the tag overall data. You can combine values when appropriate by using a bitwise OR ( | ):

Flag Meaning
READFILEMETADATA_NOMEMORY [0x01] Do not read the tag overall data. If this flag is set, then puDataSize and ppData will not be used and the function will not read the Geo key overall data.

L_UINT *puGeoKeyCount

Address of the variable to be updated with the number of Geo keys found in the file.


Pointer to an array of LEADFILETAG structures. Each element of the array contains data for one Geo key field found in the file. The number of elements in ppGeoKeys is puGeoKeyCount. When this array is no longer needed pass it to the LFile::FreeTags function to free the allocated memory.

L_SIZE_T *puDataSize

Address of the variable to be updated with the size in bytes of the overall Geo key fields data.

L_UCHAR ** ppData

Address of the variable to be updated with a pointer to the overall Geo key fields data. The size of this pointer in bytes is puDataSize. Each LEADFILETAG item found contains an offset to where the data for this item is stored in ppData.


Pointer to optional extended load options. Pass NULL to use the default load options.


Value Meaning
SUCCESS The function was successful.
< 1 An error occurred. Refer to Return Codes.


You must free the data allocated with this function using the LFile::FreeTags function.

For more information about GeoKeys, refer to Implementing GeoKeys (GeoTIFF tags).

Required DLLs and Libraries


Win32, x64.

See Also




For an example, refer to LFile::ReadTags.

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