When "getting" a BSTR property, the memory containing the string is allocated with SysAllocString. When this string is no longer needed, free this memory by calling SysFreeString if you are working in an environment such as C or C++ that does not automatically delete the memory. VB automatically deletes the memory, so VB programmers do not need to free the memory themselves.

ILTStlImgWrt Interface

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Data types

1. File Flags:

#define SHOWPROG 0x01
#define SHOWQFACTOR 0x02
#define SHOWMULTIPAGE 0x04
#define SHOWSTAMP 0x08
#define LOSSLESS_JPEG 0x10

Describe possible values for the InfoFileTypeFlags property and the InfoFileSubTypeFlags property listed in the Interface Properties section below.

2. File Save Options:

typedef [v1_enum] enum FileSaveOptions
{
   SAVE_OPTION_OVERWRITE = 1,
   SAVE_OPTION_SKIP = 2,
   SAVE_OPTION_USE_NEXT_NAME = 4,
   SAVE_OPTION_APPLYTOALL = 8,
} FileSaveOptions;

Describes possible options when trying to save to a file that already exists.

Constant	Description
SAVE_OPTION_OVERWRITE	Save the current frame over the existing file if it currently exists.
SAVE_OPTION_SKIP	Skip saving the current frame if the file name currently exists.
SAVE_OPTION_USE_NEXT_NAME	Generate the next file name if the file name currently exists.
SAVE_OPTION_APPLYTOALL	Apply the option to all subsequent cases.

3. File Format Types:

These are the same as in the LEADTOOLS Raster Imaging documentation. For a complete list of format types, refer to Summary of All Supported Image File Formats

typedef [v1_enum] enum FileTypeConstants
{
   SAVEFILE_CMP                   = 5,
   SAVEFILE_LEAD1BIT = 26,
   SAVEFILE_JFIF = 10,
   SAVEFILE_CMW = 165,
   SAVEFILE_J2K = 164,
   SAVEFILE_TIF = 3,
   SAVEFILE_GIF = 2,
   SAVEFILE_PNG = 75,
   SAVEFILE_CALS = 50,
   SAVEFILE_CLP = 114,
   SAVEFILE_DICOM_GRAY = 89,
   SAVEFILE_DICOM_COLOR = 90,
   SAVEFILE_CUT = 108,
   SAVEFILE_EMF = 116,
   SAVEFILE_EPS = 16,
   SAVEFILE_EXIF = 96,
   SAVEFILE_FAX_G4 = 68,
   SAVEFILE_FLC = 134,
   SAVEFILE_FPX = 80,
   SAVEFILE_IMG = 52,
   SAVEFILE_IFF_ILBM = 111,
   SAVEFILE_ICA_G4 = 73,
   SAVEFILE_INTERGRAPH_RLE = 122,
   SAVEFILE_JBIG = 115,
   SAVEFILE_MAC = 51,
   SAVEFILE_PCT = 56,
   SAVEFILE_RAWICA_G4 = 79,
   SAVEFILE_MSP = 53,
   SAVEFILE_OS2 = 14,
   SAVEFILE_PBM_ASCII = 106,
   SAVEFILE_PCX = 1,
   SAVEFILE_PGM_ASCII = 104,
   SAVEFILE_PPM_ASCII = 106,
   SAVEFILE_PSD = 76,
   SAVEFILE_RAW = 153,
   SAVEFILE_SCT = 250,
   SAVEFILE_SGI = 142,
   SAVEFILE_RAS = 55,
   SAVEFILE_TGA = 4,
   SAVEFILE_WFX_G4 = 70,
   SAVEFILE_BMP = 6,
   SAVEFILE_WIN_CUR = 92,
   SAVEFILE_WIN_ICO = 91,
   SAVEFILE_WBMP = 170,
   SAVEFILE_WMF = 15,
   SAVEFILE_WPG = 54,
   SAVEFILE_XBM = 110,
   SAVEFILE_SMP = 256,
   SAVEFILE_XPM = 109,
   SAVEFILE_XWD10 = 132,
   SAVEFILE_XWD11 = 133
} FileTypeConstants;

File Type Constant	Description
SAVEFILE_CMP	LEAD CMP
SAVEFILE_LEAD1BIT	LEAD 1 bit, lossless compression
SAVEFILE_JFIF	Jpeg File Interchange Format
SAVEFILE_CMW	Wavelet CMP
SAVEFILE_J2K	Jpeg2000 stream
SAVEFILE_TIF	Tagged Image File Format
SAVEFILE_GIF	CompuServe GIF
SAVEFILE_PNG	Portable Network Graphics
SAVEFILE_CALS	CALS Raster file
SAVEFILE_CLP	Microsoft Windows Clipboard Uncompressed
SAVEFILE_DICOM_GRAY	Grayscale DICOM uncompressed
SAVEFILE_DICOM_COLOR	Color DICOM uncompressed
SAVEFILE_CUT	Dr. Halo.
SAVEFILE_EMF	Windows Enhanced Metafile
SAVEFILE_EPS	Encapsulated PostScript
SAVEFILE_EXIF	Uncompressed RGB Exif file
SAVEFILE_FAX_G4	Raw FAX, compressed using CCITT group 4
SAVEFILE_FLC	Flic Animation 256 color
SAVEFILE_FPX	FlashPix, with no compression
SAVEFILE_IMG	GEM Image
SAVEFILE_IFF_ILBM	Interchange File - RLE Compressed.
SAVEFILE_ICA_G4	IOCA, compressed using CCITT group 4
SAVEFILE_INTERGRAPH_RLE	ITG, Intergraph RLE compressed file
SAVEFILE_JBIG	JBIG compression.
SAVEFILE_MAC	MacPaint - Macintosh Paint
SAVEFILE_PCT	Macintosh QuickDraw
SAVEFILE_RAWICA_G4	IOCA, compressed using CCITT group 3, 2 dimensions, without the MO:DCA wrapper.
SAVEFILE_MSP	Microsoft Paint
SAVEFILE_OS2	OS/2 BMP version 1.x
SAVEFILE_PBM_ASCII	Portable Bitmap - ASCII File
SAVEFILE_PCX	ZSoft PCX
SAVEFILE_PGM_ASCII	Portable Greymap - ASCII File
SAVEFILE_PPM_ASCII	Portable Pixelmap - ASCII File
SAVEFILE_PSD	Adobe Photoshop 3.0.
SAVEFILE_RAW	Raw uncompressed data
SAVEFILE_SCT	Scitex Continuous Tone Format
SAVEFILE_SGI	Silicon Graphics Image uncompressed
SAVEFILE_RAS	Sun Raster, uncompressed
SAVEFILE_TGA	TARGA, uncompressed
SAVEFILE_WFX_G4	Winfax, compressed using CCITT group
SAVEFILE_BMP	Windows BMP, with no compression
SAVEFILE_WIN_CUR	Windows Cursor
SAVEFILE_WIN_ICO	Windows Icon
SAVEFILE_WBMP	Wireless Bitmap
SAVEFILE_WMF	Windows Metafile
SAVEFILE_WPG	WordPerfect Graphics Format
SAVEFILE_XBM	XWindows XbitMap
SAVEFILE_SMP	Xionics format
SAVEFILE_XPM	XWindows XPicMap
SAVEFILE_XWD10	XWindows X Window dump, version 10
SAVEFILE_XWD11	XWindows X Window dump, version 11

4.Callback Options:

typedef [v1_enum] enum SaveCallbackFlagsOptions
{
   FRAME_OPTION_SAVE = 0,
   FRAME_OPTION_SKIP = 1,
   FRAME_OPTION_SKIP_AND_KEEP_NAME = 2
} SaveCallbackFlagsConstants;

Describes possible options when saving data using the callback.

Constant	Description
FRAME_OPTION_SAVE	The filter will save the frame.
FRAME_OPTION_SKIP	The filter will not save the frame and will use the next output file name sequence for the next frame.
FRAME_OPTION_SKIP_AND_KEEP_NAME	The filter will not save the frame and will use the current output file name sequence for the next frame.

Interface Properties

Type	Name	Description
long	BitsPerPixel	Gets or sets the bits per pixel for the current file type. Changing this property will also change the FileTypeIndex, IsQFactorSupported, IsMultipageSupported and FileSubTypeIndex properties.
BSTR	FileName	Gets or sets the output file name. If the filter is loaded without specifying an output file name, a temporary file name is generated and the user is asked whether to use the temporary filename or not. If the user chooses not to use the temporary file name, the graph will not run. The user is responsible for freeing the allocated string.
long	FileSubTypeIndex	Gets or sets the current file subtype index. If the current file type has no subtypes, then trying to get or set this property will result in an E_INVALIDARG error.
FileTypeConstants	FileTypeFormat	Gets or sets the current file type format. Changing this value will also change the FileSubTypeIndex property. Generally, any change to this property will affect the following properties: FileTypeIndex, BitsPerPixel, IsQFactorSupported, IsMultipageSupported and FileSubTypeIndex. This property takes one of the enumerated FileTypeConstants. The file formats are the same as in the LEADTOOLS Raster Imaging documentation. For a complete list of format types, see "Formats of Output Files" in either the Ltcomn.hlp file or the Ltdlln.hlp file. These files are located in the LEAD/HELP directory, where LEAD represents the directory in which you installed the toolkit.
long	FileTypeIndex	Gets or sets the file type index. Any change in this value will affect the following properties: FileTypeFormat, BitsPerPixel, IsQFactorSupported, IsMultipageSupported, and FileSubTypeIndex.
SaveFileOptions	HandleExistingFile	Gets or sets the option for handling existing files (overwriting options) when saving. For a list of possible values, refer to File Save Options. SAVE_OPTION_APPLYTOALL can be ORed with the chosen option to apply it to all subsequent cases.
long	InfoFileSubTypeFlags(long lFileTypeIndex);	Read only. Gets the subtype flags for the file type and file subtype at the specified index. For a list of possible values, refer to File Flags. Please note that these values may be combined using OR.
long	InfoFileSubTypeFormat(long lFileTypeIndex);	Read only. Gets the subtype format for the file type and file subtype at the specified index.
long	InfoFileSubTypesCount(long lFileTypeIndex);	Read only. Gets the number of subtypes for the file type at the specified index.
BSTR	InfoFileSubTypeString(long lFileSubTypeIndex)	Read only. Gets the subtype string for the file type and file subtype at the specified index. The user is responsible for freeing the allocated string.
long	InfoFileTypeBpp(long lIndex)	Read only. Gets the bits per pixel for the file type at the specified index.
BSTR	InfoFileTypeExt(long lIndex)	Read only. Gets the extension string for the file type at the specified index. The user is responsible for freeing the allocated string.
long	InfoFileTypeFlags(long lIndex)	Read only. Gets the flags for the file type at the specified index. For a list of possible values, refer to File Flags. Please note that these values may be combined using OR.
long	InfoFileTypeFormat(long lIndex)	Read only. Gets the file type format for the specified file type index. The file formats are the same as in the LEADTOOLS Raster Imaging documentation. For a complete list of format types, see "Formats of Output Files" in either the Ltcomn.hlp file or the Ltdlln.hlp file. These files are located in the LEAD/HELP directory, where LEAD represents the directory in which you installed the toolkit.
BSTR	InfoFileTypeString(long lIndex)	Read only. Gets the file type string for the specified file type index. The user is responsible for freeing the allocated string.
VARIANT_BOOL	InputPinStreamingState	Read only. Retrieves the streaming state of the input pin; VARIANT_TRUE if running and VARIANT_FALSE otherwise.
VARIANT_BOOL	IsMultipageSupported	(Read only) Indicates whether the current file type supports multi-page files.
VARIANT_BOOL	IsQFactorSupported	(Read only) Indicates whether the current file type supports the QFactor for controlling the file compression.
long	LastErrorCode	(Read only) Gets the last error code. This will be one of the standard LEADTOOLS error codes. For a list of possible error codes, refer to Return Codes.
BSTR	LastErrorString	(Read only) Gets the last error string. The user is responsible for freeing the allocated string.
long	NumberingDigits	Gets or sets the number of digits to use in the output file sequence names.
VARIANT_BOOL	PromptOverwrite	Enables or disables prompting for the file overwrite options. If this property is set to VARIANT_TRUE, a dialog will be shown if the next file name to be used already exists. The dialog will offer the overwrite, skip, and use next available name options in addition to an apply for all option. If this property is set to VARIANT_FALSE, the option in the HandleExistingFile property will be used without asking.
long	QFactor	Gets or sets the QFactor for the current file type format.
VARIANT_BOOL	SaveMultipage	Enables or disables saving to a multi-page file. This will only affect formats that support multi-page files. See also the IsMultipageSupported property.
ILTStlImgWrtUserCallback	SaveOptionsCallback	Sets the callback object pointer. For more information, refer to the ILTStlImgWrtUserCallback interface.
long	SupportedFileTypesCount	Read only. Retrieves the number of file types that the filter can save. This can be used to loop through all the supported types getting information such as the string, the bits per pixel, the extension, etc. This can help you build your own user interface.
VARIANT_BOOL	UseTempFileName	Gets or sets a flag that indicates whether to use the temp file name if the user did not set the output file name in the FileName property. If the value is VARIANT_TRUE the filter will create a temp file name and use it. If the value is VARIANT_FALSE the filter will create a temp file and ask the user if he wants to save the frame using the temp file name.
Long	DialogParentWnd	Gets or sets the window handle for the messages boxes and the prompt dialog.
VARIANT_BOOL	EnableMessageBoxes	Enables or disables the displaying of the messages boxes when an error occurred.

Interface Methods:

HRESULT ResetErrorCode()

Description

To reset the last error value to success.

Returns

S_OK if successful, or another error code otherwise.