Edit

WS_TRANSFER_MODE enumeration (webservices.h)

  • Article

Whether messages that are sent or received are streamed or buffered.

Syntax

typedef enum {
  WS_STREAMED_INPUT_TRANSFER_MODE = 0x1,
  WS_STREAMED_OUTPUT_TRANSFER_MODE = 0x2,
  WS_BUFFERED_TRANSFER_MODE = 0x0,
  WS_STREAMED_TRANSFER_MODE
} WS_TRANSFER_MODE;

Constants

 
WS_STREAMED_INPUT_TRANSFER_MODE
Value: 0x1
Setting this flag means messages are delivered in chunks. The start of the message
(opening tag, headers, and opening body tag) will be returned to the application
when WsReadMessageStart completes. It is up to the application to call
WsFillBody before reading each chunk of the message body. The end of
the message (closing body and envelope tags) will be read when WsReadMessageEnd is called.


Not setting this flag means the entire message is read and buffered
in memory before WsReadMessageStart indicates completion.
WS_STREAMED_OUTPUT_TRANSFER_MODE
Value: 0x2
Setting this flag means messages are transmitted in chunks. The start of the message (opening
envelope tag, headers, and opening body tag) will be transmitted when WsWriteMessageStart is called. It is up to the application to call WsFlushBody after writing each chunk
of the message body to cause the chunk to be transmitted.
Any remaining body data will be transmitted when WsWriteMessageEnd is called, along with
the end of the message (closing body and envelope tags).


Not setting this flag means the entire message is buffered in
memory and is only transmitted once WsWriteMessageEnd is called.
WS_BUFFERED_TRANSFER_MODE
Value: 0x0
Messages that are written or read are buffered.


This is equivalent to specifying neither
WS_STREAMED_INPUT_TRANSFER_MODE nor
WS_STREAMED_OUTPUT_TRANSFER_MODE.
WS_STREAMED_TRANSFER_MODE
Messages that are written or read are streamed.


This is equivalent to specifying both
WS_STREAMED_INPUT_TRANSFER_MODE and
WS_STREAMED_OUTPUT_TRANSFER_MODE.

Remarks

This value is specified for a channel using the WS_CHANNEL_PROPERTY_TRANSFER_MODE channel property.

The streaming programming model can be used regardless of which transfer mode is used. In the case where streaming is not used, the calls to the calls to WsFillBody and WsFlushBody are NOPs.

Requirements

Requirement Value
Minimum supported client Windows 7 [desktop apps only]
Minimum supported server Windows Server 2008 R2 [desktop apps only]
Header webservices.h