#include "l_bitmap.h"
L_INT pEXT_CALLBACK YourFunction(uTag, uType, uCount, pData, pUserData)
This function is called for each GeoKey enumerated by the L_EnumFileGeoKeys 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. |
For TAG_ASCII, uCount represents the number of bytes in pData
.
For TAG_SHORT and TAG_DOUBLE, uCount represents the number of items in the pData
buffer.
Note that for TAG_SHORT and TAG_DOUBLE, uCount does not represent the number of bytes. Instead, it represents the number of items. 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.
A void pointer that you can use to access a variable or structure containing data that your callback function needs. This gives you a way to receive data indirectly from the function that uses this callback function. (This is the same pointer that you pass in the pUserData parameter of the L_EnumFileGeoKeys function.)
Keep in mind that this is a void pointer, which must be cast to the appropriate data type within your 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.
Required DLLs and Libraries
Help Collections
Raster .NET | C API | C++ Class Library | HTML5 JavaScript
Document .NET | C API | C++ Class Library | HTML5 JavaScript
Medical .NET | C API | C++ Class Library | HTML5 JavaScript
Medical Web Viewer .NET
Multimedia
Direct Show .NET | C API | Filters
Media Foundation .NET | C API | Transforms
Supported Platforms
.NET, Java, Android, and iOS/macOS Assemblies
Imaging, Medical, and Document
C API/C++ Class Libraries
Imaging, Medical, and Document
HTML5 JavaScript Libraries
Imaging, Medical, and Document