DSFileFetcher
The DSFileFetcher
class is a utility class that partitions a multi-page image file into multiple independent ImageData
objects. It inherits from the DSImageSourceAdapter
class.
Definition
Assembly: DynamsoftUtility.xcframework
- Objective-C
- Swift
@interface DSFileFetcher : DSImageSourceAdapter
class FileFetcher : DSImageSourceAdapter
Methods
Method | Description |
---|---|
setFileWithPath |
Sets the file with a file path. |
setFileWithBytes |
Sets the file with file bytes. |
setFileWithBuffer |
Sets the file with a DSImageData object. |
setFileWithImage |
Sets the file with a UIImage . |
hasNextImageToFetch |
Whether there is a next image to fetch. |
getImage |
Get the image data of the image. |
setPages |
Set the pages to read. |
The following methods & attributes are inherited from DSImageSourceAdapter
.
Attributes | Type | Description |
---|---|---|
bufferEmpty |
BOOL | The read only property determines whether the buffer is currently empty. |
bufferOverflowProtectionMode |
DSBufferOverflowProtectionMode | Sets the behavior for handling new incoming images when the buffer is full. |
colourChannelUsageType |
colourChannelUsageType | Sets the usage type for color channels in images. |
hasNextImageToFetch |
BOOL | Determines whether there are more images available to fetch. |
imageCount |
NSUInteger | The property defines the current number of images in the buffer. |
maxImageCount |
NSUInteger | The property defines the maximum number of images that can be buffered. |
Method | Description |
---|---|
addImageToBuffer |
Adds an image to the internal buffer. |
clearBuffer |
Clears all images from the buffer, resetting the state for new image fetching. |
getImage |
Get a buffered image. Implementing classes should return a Promise that resolves with an instance of DSImageData . |
hasImage |
Checks if an image with the specified ID is present in the buffer. |
setErrorListener |
Sets an error listener to receive notifications about errors that occur during image source operations. |
setNextImageToReturn |
Sets the processing priority of a specific image. This can affect the order in which images are returned by getImage . |
startFetching |
Start fetching images from the source to the Video Buffer of ImageSourceAdapter. |
stopFetching |
Stop fetching images from the source to the Video Buffer of ImageSourceAdapter. |
setFileWithPath
Sets the file with a file path.
- Objective-C
- Swift
-(BOOL)setFileWithPath:(NSString *)filePath error:(NSError *_Nullable *_Nullable)error;
func setFile(withPath filePath: String) throws
Parameters
filePath
: The file path.
error
: An NSError
pointer. If an error occurs, it will represent the error information.
Error
Error Code | Value | Description |
---|---|---|
EC_FILE_NOT_FOUND | -10005 | The file is not found. |
EC_FILE_TYPE_NOT_SUPPORTED | -10006 | The file type is not supported. |
setFileWithBytes
Sets the file with file bytes.
- Objective-C
- Swift
-(BOOL)setFileWithBytes:(NSData *)fileBytes error:(NSError *_Nullable *_Nullable)error;
func setFile(withBytes fileBytes: Data) throws
Parameters
fileBytes
: The file bytes.
error
: An NSError
pointer. If an error occurs, it will represent the error information.
Error
Error Code | Value | Description |
---|---|---|
EC_NULL_POINTER | -10002 | The fileBytes you input is null. |
setFileWithBuffer
Sets the file with a DSImageData
object.
- Objective-C
- Swift
-(BOOL)setFileWithBuffer:(DSImageData *)buffer error:(NSError *_Nullable *_Nullable)error;
func setFile(withBuffer buffer: ImageData) throws
Parameters
buffer
: The image data.
error
: An NSError
pointer. If an error occurs, it will represent the error information.
Error
Error Code | Value | Description |
---|---|---|
EC_NULL_POINTER | -10002 | The fileBytes you input is null. |
setFileWithImage
Sets the file with a UIImage
.
- Objective-C
- Swift
-(BOOL)setFileWithImage:(UIImage *)image error:(NSError *_Nullable *_Nullable)error;
func setFile(withImage image: UIImage) throws
Parameters
image
: A UIImage
.
error
: An NSError
pointer. If an error occurs, it will represent the error information.
Error
Error Code | Value | Description |
---|---|---|
EC_NULL_POINTER | -10002 | The fileBytes you input is null. |
hasNextImageToFetch
Whether there is a next image to fetch.
- Objective-C
- Swift
-(BOOL)hasNextImageToFetch;
func hasNextImageToFetch() -> Bool
Return Value
A bool value that indicates whether there is a next image to fetch.
getImage
Get the image data of the image.
- Objective-C
- Swift
-(DSImageData *)getImage;
func getImage() -> ImageData
Return Value
A DSImageData
as the image.
setPages
Set the pages to read.
- Objective-C
- Swift
-(BOOL)setPages:(NSArray *)pages error:(NSError *_Nullable *_Nullable)error;
func setPages(_ pages: NSArray) throws -> BOOL
Parameters
pages
: An array that contains all the pages to read.
error
: An NSError
pointer. If an error occurs, it will represent the error information.
Error
Error Code | Value | Description |
---|---|---|
EC_FILE_NOT_FOUND | -10005 | File not found. |
EC_FILE_TYPE_NOT_SUPPORTED | -10006 | The file type is not supported. |
EC_IMAGE_READ_FAILED | -10012 | Failed to read the image. |