PR_TransmitFile 编辑

Sends a complete file across a connected socket.

Syntax

#include <prio.h>

/wiki/en-US/docs/Mozilla/Projects/NSPR/Reference/PRInt32 PR_TransmitFile(
  /wiki/en-US/docs/Mozilla/Projects/NSPR/Reference/PRFileDesc *networkSocket,
  /wiki/en-US/docs/Mozilla/Projects/NSPR/Reference/PRFileDesc *sourceFile,
  const void *headers,
  /wiki/en-US/docs/Mozilla/Projects/NSPR/Reference/PRInt32 hlen,
  PRTransmitFileFlags flags,
  /wiki/en-US/docs/Mozilla/Projects/NSPR/Reference/PRIntervalTime timeout);

Parameters

The function has the following parameters:

networkSocket

A pointer to a /wiki/en-US/docs/Mozilla/Projects/NSPR/Reference/PRFileDesc object representing the connected socket to send data over.

sourceFile

A pointer to a /wiki/en-US/docs/Mozilla/Projects/NSPR/Reference/PRFileDesc object representing the file to send.

headers

A pointer to the buffer holding the headers to be sent before sending data.

hlen

Length of the headers buffer in bytes.

flags

One of the following flags:

• PR_TRANSMITFILE_KEEP_OPEN indicates that the socket will be kept open after the data is sent.
• PR_TRANSMITFILE_CLOSE_SOCKET indicates that the connection should be closed immediately after successful transfer of the file.

timeout

Time limit for completion of the transmit operation.

Returns

• A positive number indicates the number of bytes successfully written, including both the headers and the file.
• The value -1 indicates a failure. If an error occurs while sending the file, the PR_TRANSMITFILE_CLOSE_SOCKET flag is ignored. The reason for the failure can be obtained by calling PR_GetError.

Description

The PR_TransmitFile function sends a complete file (sourceFile) across a connected socket (networkSocket). If headers is non-NULL, PR_TransmitFile sends the headers across the socket before sending the file.

The enumeration PRTransmitFileFlags, used in the flags parameter, is defined as follows:

typedef enum PRTransmitFileFlags {
  PR_TRANSMITFILE_KEEP_OPEN = 0,
  PR_TRANSMITFILE_CLOSE_SOCKET = 1
} PRTransmitFileFlags;