IG_page_count_get

This function obtains the number of pages in the image file specified by its file handle.

Declaration:

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AT_ERRCOUNT ACCUAPI IG_page_count_get_FD( AT_INT fd, LONG lOffset, LPUINT lpPageCount );

Arguments:

Name	Type	Description
fd	AT_INT	Handle of the open file. This handle can be obtained from Microsoft Windows function such as CreateFile(), and cast to AT_INT for passing to the function parameter. FILE pointers returned by functions such as fopen(), and file handles returned by functions such as _sopen_s() are not supported.
lOffset	LONG	Offset into the file, in bytes, to where the image begins. This is the offset to the beginning of the header, not to the beginning of the bitmap. lOffset is usually 0.
lpPageCount	LPUINT	Pointer to a UINT variable to receive page count .

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:

Filters, FlashPix, Vector

Example:

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HANDLE fd; // File Descriptor UINT nPages; // Will receive number of pages AT_ERRCOUNT nErrcount; // Count of returned errors fd = CreateFile(_T("picture.bmp"), GENERIC_READ, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); if(fd != INVALID_HANDLE_VALUE) { nErrcount = IG_page_count_get_FD((AT_INT)fd, 0, &nPages); CloseHandle(fd); }

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HANDLE fd;                // File Descriptor
UINT nPages;            // Will receive number of pages
AT_ERRCOUNT nErrcount;  // Count of returned errors

fd = CreateFile(_T("picture.bmp"), GENERIC_READ,
        0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if(fd != INVALID_HANDLE_VALUE)
{
    nErrcount = IG_page_count_get_FD((AT_INT)fd, 0, &nPages);
    CloseHandle(fd);
}

Remarks:

Call this function when the file is already opened and you have its File Descriptor handle (fd).