L_GetComment - Raster Imaging C API Help

L_GetComment

#include "l_bitmap.h"

L_LTFIL_API L_INT L_GetComment(uType, pComment, uLength)

L_UINT uType;

type of comment

L_UCHAR* pComment;

pointer to the target buffer

L_UINT uLength;

size of the target buffer

Gets a current field that is ready to be saved as a comment in a file. This lets you see the field that was specified with the L_SetComment function.

Parameter

Description

uType

The type of comment. Refer to Types of File Comments.

pComment

Pointer to your buffer that will hold the comment field. You can pass NULL if you only want to get the length of the field (the return value).

uLength

The size of your buffer that will hold the comment field.

Returns

>=0

Length of the comment field.

< 0

An error occurred. Refer to Return Codes.

Comments

Some file formats can contain comments, and some cannot, and each file format has its own set of comment types. When you save a file, the comments, which LEADTOOLS maintains in a global array are saved in the file. The index into the array (specified using a constant) determines the type of comment, as described in Types of File Comments.

Before saving a file, you use the L_SetComment function to specify the comments to be saved.

The L_GetComment function lets you get any of the current comments that are ready to be saved, for example, if you want to let the user review the comments before saving a file. Before getting a comment, you must allocate a buffer for the field. If you do not know how big the buffer needs to be, you can call this function twice: the first time to get the length of the field (the return value), and the second time to actually get the field.

The L_ReadFileComment function lets you read comments that are already saved in a file header. For more information refer to the L_SetComment function.

Note:

More options are available in the LOADFILEOPTION structure.

Required DLLs and Libraries

LTFIL

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64, Linux.

Help Version 20.0.2018.7.30
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LEADTOOLS Raster Imaging C API Help