write_all

Tries to write buffer.length bytes from buffer into the stream.

Will block during the operation.

This function is similar to write, except it tries to write as many bytes as requested, only stopping on an error.

On a successful write of buffer.length bytes, true is returned, and bytes_written is set to buffer.length.

If there is an error during the operation false is returned and throws is set to indicate the error status, bytes_written is updated to contain the number of bytes written into the stream before the error occurred.

Parameters:

this	a OutputStream.
buffer	the buffer containing the data to write.
bytes_written	location to store the number of bytes that was written to the stream
cancellable	optional Cancellable object, null to ignore.
count	the number of bytes to write

Returns:

true on success, false if there was an error