IG_fltr_save_mem_size

This function is used to determine the size that is required for saving the image to the file or memory buffer in the given format.

Declaration:

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AT_ERRCOUNT ACCUAPI IG_fltr_save_mem_size_calc( HIGEAR hIGear, LPVOID lpImage, AT_UINT nImageSize, AT_LMODE lFormatType, AT_UINT nPageNumber, AT_BOOL reserved_overwrite, LPAT_UINT lpFileSize );

Arguments:

Name	Type	Description
hIGear	HIGEAR	HIGEAR handle of the image on which to calculate the size.
lpImage	LPVOID	If the buffer exists and already contains an image file to which a page will be appended, this parameter specifies a pointer to first byte of the existing file in the memory buffer.
nImageSize	AT_UINT	If the buffer exists and already contains an image file to which a page will be appended, this parameter specifies the size of existing image.
lFormatType	AT_LMODE	Specifies the format to use for saving, and also the compression scheme if applicable. See enumIGSaveFormats for possible values.
nPageNumber	AT_UINT	Specifies the page number of the page inserted into a multi-page file. Note that page numbers begin at 1, not 0. Set to 0 to append the page after the last page of the source file. Set to 1 if the file format does not support multipage, or if saving to a new file.
reserved_overwrite	AT_BOOL	Reserved for future use. Set to FALSE.
lpFileSize	LPAT_UINT	Returns the maximum possible size of the file.

Return Value:

Returns 0 if successful. Otherwise, returns the number of ImageGear errors that occurred during this function call.

Supported Raster Image Formats:

All pixel formats supported by ImageGear for C and C++.

Sample:

Memory IO

Example:

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AT_ERRCOUNT nErrCount; HIGEAR hIGear = 0; AT_UINT nFileSize; // File size returned; nErrCount = IG_load_file("picture.tif", &hIGear); if(nErrCount == 0) { nErrCount = IG_fltr_save_mem_size_calc(hIGear, NULL, 0, IG_SAVE_TIF_UNCOMP, 1, TRUE, &nFileSize); IG_image_delete(hIGear); }

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AT_ERRCOUNT nErrCount;

HIGEAR hIGear = 0;
AT_UINT nFileSize;    // File size returned;
nErrCount = IG_load_file("picture.tif", &hIGear);
if(nErrCount == 0)
{
    nErrCount = IG_fltr_save_mem_size_calc(hIGear, NULL, 0, IG_SAVE_TIF_UNCOMP, 1, TRUE, &nFileSize);
    IG_image_delete(hIGear);
}

Remarks:

This function can be used prior to calling IG_fltr_save_mem to determine the amount of memory that needs to be allocated.

This function supports the calculation of a multipage image file size after addition of a page. If a file exists in the memory buffer before calling this function, and the file format supports appending pages, the function calculates the size of the file after appending the page.