nsIBinaryInputStream 编辑

xpcom/io/nsIBinaryInputStream.idlScriptable This interface allows consumption of primitive data types from a "binary stream" containing untagged, big-endian binary data, that is as produced by an implementation of nsIBinaryOutputStream. This might be used, for example, to implement network protocols or to read from architecture-neutral disk files, that is ones that can be read and written by both big-endian and little-endian platforms. Inherits from: nsIInputStream Last changed in Gecko 1.7

Method overview

PRUint8 read8();

PRUint16 read16();

PRUint32 read32();

PRUint64 read64();

unsigned long readArrayBuffer(in PRUint32 aLength, in jsval aArrayBuffer);

PRBool readBoolean();

void readByteArray(in PRUint32 aLength, [array, size_is(aLength), retval] out PRUint8 aBytes);

void readBytes(in PRUint32 aLength, [size_is(aLength), retval] out string aString);

ACString readCString();

double readDouble();

float readFloat();

AString readString();

void setInputStream(in nsIInputStream aInputStream);

Methods

read8()

Reads from the stream.

PRUint8 read8();

Parameters

None.

Return value

An 8-bit integer read from the stream.

read16()

Reads from the stream.

PRUint16 read16();

Parameters

None.

Return value

A 16-bit integer read from the stream.

read32()

Reads from the stream.

PRUint32 read32();

Parameters

None.

Return value

A 32-bit integer read from the stream.

read64()

Reads from the stream.

Warning: This method is available from JavaScript; however JavaScript does not support 64-bit integers.

PRUint64 read64();

Parameters

None.

Return value

A 64-bit integer read from the stream.

readArrayBuffer()

Read opaque bytes from the stream, storing the results in an ArrayBuffer.

unsigned long readArrayBuffer(in PRUint32 aLength, in jsval aArrayBuffer);

Parameters

aLength

The number of bytes that should be read.

aArrayBuffer

The arraybuffer in which to store the results.

Return value

The number of bytes actually read into aArrayBuffer.

readBoolean()

Reads an 8-bit value from the stream, treating it as a Boolean value.

PRBool readBoolean();

Parameters

None.

Return value

A boolean value read from the stream.

readByteArray()

Reads an opaque byte array from the stream, storing the results as an array of PRUint8s.

void readByteArray(
  in PRUint32 aLength,
  [array, size_is(aLength), retval] out PRUint8 aBytes
);

Parameters

aLength

The number of bytes that must be read.

aBytes

An array containing the bytes read from the stream.

Exceptions thrown

NS_ERROR_FAILURE

If it can't read aLength bytes.

readBytes()

Reads an opaque byte array from the stream.

void readBytes(
  in PRUint32 aLength,
  [size_is(aLength), retval] out string aString
);

Parameters

aLength

The number of bytes to read.

aString

A string containing the bytes read from the stream.

Exceptions thrown

NS_ERROR_FAILURE

If it can't read aLength bytes.

readCString()

Reads an 8-bit pascal style string from the stream. 32-bit length field, followed by length 8-bit chars.

ACString readCString();

Parameters

None.

Return value

The string read from the stream.

readDouble()

Reads from the stream.

double readDouble();

Parameters

None.

Return value

A double read from the stream.

readFloat()

Reads from the stream.

float readFloat();

Parameters

None.

Return value

A float read from the stream.

readString()

Reads an 16-bit pascal style string from the stream. 32-bit length field, followed by length PRUnichars.

AString readString();

Parameters

None.

Return value

The string read from the stream.

setInputStream()

void setInputStream(
  in nsIInputStream aInputStream
);

Parameters

aInputStream

The stream from which to read.

See also

• nsIBinaryOutputStream
• nsIInputStream
• nsIOutputStream