virtual L_INT LFile::EnumGeoKeysCallBack(uTag, uType, uCount, pData)
This function is called for each GeoKey enumerated by the LFile::EnumGeoKeys function.
GeoKey ID identifying the GeoTIFF key.
The type of GeoKey. This indicates whether the data pointed to by pData is SHORT, DOUBLE or ASCII. Possible values are:
Value | Meaning |
---|---|
TAG_ASCII | [2] Byte in the range of 0 to 255. Null-terminated. |
TAG_SHORT | [3] Two bytes, unsigned. |
TAG_DOUBLE | [12] Eight bytes used as a double-precision floating-point number. |
TAG_IFD | [13] 32-bit IFD offset. |
TAG_LONG8 | [16] Unsigned 64-bit integer (valid only for BigTIFF formats). |
TAG_SLONG8 | [17] Signed 64-bit integer (valid only for BigTIFF formats). |
TAG_IFD8 | [18] 64-bit IFD offset (valid only for BigTIFF formats). |
The number of items in the pData buffer. Note that this does not describe the number of bytes. For example, if uCount is 10 and uType is TAG_DOUBLE, you will need 10 x 8 = 80 bytes to read the tag data.
A void pointer that you can use to access a variable or structure containing the GeoKey data. This gives you a way to receive data indirectly from the function that uses this callback function.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
This function will be called for every GeoKey on the page.
Win32, x64.
For an example, refer to LFile::EnumGeoKeys function.
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