nsISeekableStream 编辑
xpcom/io/nsISeekableStream.idlScriptable Provides seeking support in data streams. Inherits from: nsISupports Last changed in Gecko 1.7Method overview
void seek(in long whence, in long long offset); |
void setEOF(); |
long long tell(); |
Constants
| Constant | Value | Description |
NS_SEEK_SET | 0 | Specifies that the offset is relative to the start of the stream. |
NS_SEEK_CUR | 1 | Specifies that the offset is relative to the current position in the stream. |
NS_SEEK_END | 2 | Specifies that the offset is relative to the end of the stream. |
Methods
seek()
This method moves the stream offset of the stream implementing this interface.
void seek( in long whence, in long long offset );
Parameters
whence- Specifies how to interpret the 'offset' parameter in setting the stream offset associated with the implementing stream, according to the table of constants above.
offset- Specifies a value, in bytes, that is used in conjunction with the 'whence' parameter to set the stream offset of the implementing stream. A negative value causes seeking in the reverse direction.
Exceptions thrown
NS_BASE_STREAM_CLOSED- If called on a closed stream.
setEOF()
This method truncates the stream at the current offset.
void setEOF();
Parameters
None.
Exceptions thrown
NS_BASE_STREAM_CLOSED- If called on a closed stream.
tell()
This method reports the current offset, in bytes, from the start of the stream.
long long tell();
Parameters
None.
Return value
The current offset, in bytes, from the start of the stream.
Exceptions thrown
NS_BASE_STREAM_CLOSED- If called on a closed stream.
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