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35 lines
1.4 KiB
Markdown
35 lines
1.4 KiB
Markdown
# LibHTTP API Reference
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### `mg_websocket_write( conn, opcode, data, data_len );`
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### Parameters
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| Parameter | Type | Description |
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| :--- | :--- | :--- |
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|**`conn`**|`struct mg_connection *`|Connection on which the data must be written|
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|**`opcode`**|`int`|Opcode|
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|**`data`**|`const char *`|Data to be written to the client|
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|**`data_len`**|`size_t`|Length of the data|
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### Return Value
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| Type | Description |
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| :--- | :--- |
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|`int`|Number of bytes written or an error code|
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### Description
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The function `mg_websocket_write()` sends data to a websocket client wrapped in a websocket frame. The function issues calls to [`mg_lock_connection()`](mg_lock_connection.md) and [`mg_unlock_connaction()`](mg_unlock_connection.md) to ensure that the transmission is not interrupted. Data corruption can otherwise happn if the application is proactively communicating and responding to a request simultaneously.
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The function is available only when LibHTTP is compiled with the `-DUSE_WEBSOCKET` option.
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The function returns the number of bytes written, **0** when the connection has been closed and **-1** if an error occured.
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### See Also
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* [`mg_lock_connection();`](mg_lock_connection.md)
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* [`mg_printf();`](mg_printf.md)
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* [`mg_unlock_connection();`](mg_unlock_connection.md)
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* [`mg_websocket_client_write();`](mg_websocket_client_write.md)
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* [`mg_write();`](mg_write.md)
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