L_ReadFileCommentExt
#include "l_bitmap.h"
L_LTFIL_API L_INT L_ReadFileCommentExt (pszFile, uType, pComments, pBuffer, uLength, pLoadOptions)
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L_TCHAR* pszFile; |
/* file name */ |
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L_UINT uType; |
/* type of comment */ |
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pFILECOMMENTS pComments; |
/*pointer to a structure containing information about the comments */ |
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L_UCHAR* pBuffer; |
/*pointer to a buffer containing the comments /* |
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L_UINT* uLength; |
/*pointer to the size of the comments.*/ |
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pLOADFILEOPTION pLoadOptions; |
/* pointer to optional extended load options */ |
Gets a single comment, a group of comments or several groups of comments from a file.
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Parameter |
Description |
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pszFile |
Character string containing the FlashPix file name. |
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uType |
The type of comment. Refer to Types of File Comments. A group of comments may be obtained such as CMNT_FPXSUMMARYINFORMATION, or more than one group of comments may be retrieved by using OR as in CMNT_FPXSUMMARYINFORMATION | CMNT_FPXFILESOURCEGROUP, or all comments may be obtained by using CMNT_ALL. See Example listed below. For more information concerning FlashPix file comments, see FlashPix File Comments. |
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pComments |
Pointer to a structure which contains a data value indicating the number of comments stored, a pointer to an array of pointers which in turn point to the individual Comments, and a pointer to an array of integers which indicate the size of each Comment stored. |
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pBuffer |
Pointer to the buffer that will hold all the comments |
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uLength |
Pointer to the size of the buffer that will hold all the comments. |
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pLoadOptions |
Pointer to optional extended load options. Pass NULL to use the default load options. |
Returns
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SUCCESS |
The function was successful. |
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< 1 |
An error occurred. Refer to Return Codes. |
Comments
Presently this function only works with FlashPix format files.
The basic order of function calls to retrieve comments is as follows:
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Get the size of the comments with L_GetFileCommentSize |
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Allocate a buffer of a corresponding size. |
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Read the comments with L_ReadFileCommentExt |
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Free the buffer |
To write comments to a file, all the comments you wish to add to a new file must be set. L_SetComment sets each comment individually, but it does not save the comments to the file, it prepares the values for the next save.. Once all comments are set, the comments are saved using any function which saves files, such as L_SaveFile or L_SaveBitmap when creating a new file. If you wish to change a comment in an existing file, use L_WriteFileCommentExt.
Required DLLs and Libraries
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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
Windows 2000 / XP/Vista, Windows CE.
See Also
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Functions: |
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Topics: |
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For a list of functions that utilize the LOADFILEOPTION or SAVEFILEOPTION structures, refer to Functions Utilizing the LOADFILEOPTION or SAVEFILEOPTION structures.
Example
typedef struct _FPXCOMMENT_HEADER_ELEMENT
{
L_UINT32 size;
L_UINT32 type;
} FPXCOMMENT_HEADER_ELEMENT;
typedef struct _FPXCOMMENT_HEADER_ARRAY
{
L_UINT32 size;
L_UINT32 type;
L_UINT32 elements;
}FPXCOMMENT_HEADER_ARRAY;
L_INT ReadFileCommentExtExample(L_VOID)
{
L_INT nRet;
L_UINT32 uLength;
L_TCHAR szMessage[80];
HGLOBAL hTextToGet;
L_UCHAR *pTextToGet;
L_FLOAT *pFloat;
L_UINT32 *pLong;
L_CHAR *pString;
FPXCOMMENT_HEADER_ARRAY *pArray;
FPXCOMMENT_HEADER_ELEMENT *pElement;
FILECOMMENTS FileComments;
L_UCHAR *pPointer [CMNT_LAST + 1];
L_UINT uSize[CMNT_LAST + 1];
//Read one group of comments:
/* Determine the size, in bytes, of the desired group of comments. */
nRet = L_GetFileCommentSize(TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\IMAGE1.FPX"), CMNT_FPXSUMMARYINFORMATION, &uLength, NULL);
if(nRet != SUCCESS)
return nRet;
/* Allocate a buffer based on the size of the comments obtained by
nRet = L_GetFileCommentSize and stored in uLength. */
hTextToGet = GlobalAlloc(GPTR, uLength);
pTextToGet = (L_UCHAR *)GlobalLock(hTextToGet);
/* Initialize the FileComments structure. */
FileComments.count = CMNT_LAST + 1;
FileComments.pointer = pPointer;
FileComments.size = uSize;
/* Read the group of comments into the buffer. */
nRet = L_ReadFileCommentExt (TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\IMAGE1.FPX"), CMNT_FPXSUMMARYINFORMATION,
&FileComments, pTextToGet, &uLength, NULL);
if(nRet != SUCCESS)
return nRet;
/* Extract the desired individual comments from within the group */
pArray = (FPXCOMMENT_HEADER_ARRAY *)pPointer [CMNT_FPXTITLE];
pElement = (FPXCOMMENT_HEADER_ELEMENT *) pPointer [CMNT_FPXSECURITY];
/* Test to be sure the comments exist. If they exist, print them.*/
if((pArray != NULL)&&(pElement != NULL))
{
pString = (L_CHAR *)(pArray + 1);
pLong = (L_UINT32 *)(pElement + 1);
wsprintf(szMessage, TEXT("%hs-%ul"), pString, *pLong);
MessageBox(NULL, szMessage, TEXT("Title & Security"), MB_OK);
}
/* Free the buffer. */
GlobalFree(hTextToGet);
//Read groups of comments:
nRet = L_GetFileCommentSize(TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\IMAGE1.FPX"), CMNT_FPXSUMMARYINFORMATION |
CMNT_FPXINTELLECTUALPROPERTYGROUP, &uLength, NULL);
if(nRet != SUCCESS)
return nRet;
hTextToGet = GlobalAlloc(GPTR, uLength);
pTextToGet = (L_UCHAR *)GlobalLock(hTextToGet);
FileComments.count = CMNT_LAST + 1;
FileComments.pointer = pPointer;
FileComments.size = uSize;
nRet = L_ReadFileCommentExt (TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\IMAGE1.FPX"), CMNT_FPXSUMMARYINFORMATION |
CMNT_FPXINTELLECTUALPROPERTYGROUP,
&FileComments, pTextToGet, &uLength, NULL);
if(nRet != SUCCESS)
return nRet;
pArray = (FPXCOMMENT_HEADER_ARRAY *)pPointer[CMNT_FPXTITLE];
pElement = (FPXCOMMENT_HEADER_ELEMENT *) pPointer[CMNT_FPXEXPOSURETIME];
if((pArray != NULL)&&(pElement != NULL))
{
pString = (L_CHAR *)(pArray + 1);
pFloat = (L_FLOAT *)(pElement + 1);
_stprintf_s(szMessage,80, TEXT("%hs-%f"), pString, *pFloat);
MessageBox(NULL, szMessage, TEXT("Title & Exposure Time"), MB_OK);
}
GlobalFree(hTextToGet);
//Read all comments:
nRet = L_GetFileCommentSize(TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\IMAGE1.FPX"), CMNT_ALL, &uLength, NULL);
if(nRet != SUCCESS)
return nRet;
hTextToGet = GlobalAlloc(GPTR, uLength);
pTextToGet = (L_UCHAR *)GlobalLock(hTextToGet);
FileComments.count = CMNT_LAST + 1;
FileComments.pointer = pPointer;
FileComments.size = uSize;
nRet = L_ReadFileCommentExt (TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\IMAGE1.FPX"), CMNT_ALL, &FileComments, pTextToGet, &uLength, NULL);
if(nRet != SUCCESS)
return nRet;
pArray = (FPXCOMMENT_HEADER_ARRAY *)pPointer[CMNT_FPXTITLE];
pElement = (FPXCOMMENT_HEADER_ELEMENT *) pPointer[CMNT_FPXEXPOSURETIME];
if((pArray != NULL)&&(pElement != NULL))
{
pString = (L_CHAR *)(pArray + 1);
pFloat = (L_FLOAT *)(pElement + 1);
_stprintf_s(szMessage,80, TEXT("%hs-%f"), pString, *pFloat);
MessageBox(NULL, szMessage, TEXT("Title & Exposure Time"), MB_OK);
}
GlobalFree(hTextToGet);
return SUCCESS;
}