FileReaderSync: readAsBinaryString() method
Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see thecompatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Note: This feature is only available inWeb Workers, except forService Workers.
Note:This method is deprecated in favor ofreadAsArrayBuffer().
ThereadAsBinaryString() method of theFileReaderSync interface allows to readFile orBlob objects in a synchronous way into a string. This interface isonly available inworkers as it enables synchronous I/O that could potentially block.
Syntax
readAsBinaryString(blob)Parameters
Return value
A string representing the input data.
Exceptions
NotFoundErrorDOMExceptionThrown if the resource represented by the DOM
FileorBlobcannot be found, e.g., because it has been erased.SecurityErrorDOMExceptionThrown if one of the following problematic situation is detected:
- the resource has been modified by a third party;
- too many read are performed simultaneously;
- the file pointed by the resource is unsafe for a use from the Web (like it is a system file).
NotReadableErrorDOMExceptionThrown if the resource cannot be read due to a permission problem, like a concurrent lock.
EncodingErrorDOMExceptionThrown if the resource is a data URL and exceed the limit length defined by each browser.
Specifications
| Specification |
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| File API # readAsBinaryStringSyncSection |