mirror of https://github.com/node-red/node-red.git
70 lines
3.9 KiB
HTML
70 lines
3.9 KiB
HTML
<!--
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Copyright JS Foundation and other contributors, http://js.foundation
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<script type="text/html" data-help-name="file">
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<p>Writes <code>msg.payload</code> to a file, either adding to the end or replacing the existing content.
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Alternatively, it can delete the file.</p>
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<h3>Inputs</h3>
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<dl class="message-properties">
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<dt class="optional">filename <span class="property-type">string</span></dt>
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<dd>The name of the file to be updated can be provided in the node configuration, or as a message property.
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By default it will use <code>msg.filename</code> but this can be customised in the node.
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</dd>
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<dt class="optional">encoding <span class="property-type">string</span></dt>
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<dd>If encoding is configured to be set by msg, then this optional property can set the encoding.</dt>
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</dl>
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<h3>Output</h3>
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<p>On completion of write, input message is sent to output port.</p>
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<h3>Details</h3>
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<p>Each message payload will be added to the end of the file, optionally appending
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a newline (\n) character between each one.</p>
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<p>If <code>msg.filename</code> is used the file will be closed after every write.
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For best performance use a fixed filename.</p>
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<p>It can be configured to overwrite the entire file rather than append. For example,
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when writing binary data to a file, such as an image, this option should be used
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and the option to append a newline should be disabled.</p>
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<p>Encoding of data written to a file can be specified from list of encodings.</p>
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<p>Alternatively, this node can be configured to delete the file.</p>
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</script>
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<script type="text/html" data-help-name="file in">
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<p>Reads the contents of a file as either a string or binary buffer.</p>
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<h3>Inputs</h3>
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<dl class="message-properties">
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<dt class="optional">filename <span class="property-type">string</span></dt>
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<dd>The name of the file to be read can be provided in the node configuration, or as a message property.
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By default it will use <code>msg.filename</code> but this can be customised in the node.
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</dd>
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</dl>
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<h3>Outputs</h3>
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<dl class="message-properties">
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<dt>payload <span class="property-type">string | buffer</span></dt>
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<dd>The contents of the file as either a string or binary buffer.</dd>
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<dt class="optional">filename <span class="property-type">string</span></dt>
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<dd>If not configured in the node, this optional property sets the name of the file to be read.</dd>
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</dl>
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<h3>Details</h3>
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<p>The filename should be an absolute path, otherwise it will be relative to
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the working directory of the Node-RED process.</p>
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<p>On Windows, path separators may need to be escaped, for example: <code>\\Users\\myUser</code>.</p>
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<p>Optionally, a text file can be split into lines, outputting one message per line, or a binary file
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split into smaller buffer chunks - the chunk size being operating system dependant, but typically 64k (Linux/Mac) or 41k (Windows).</p>
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<p>When split into multiple messages, each message will have a <code>parts</code>
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property set, forming a complete message sequence.</p>
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<p>Encoding of input data can be specified from list of encodings if output format is string.</p>
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<p>Errors should be caught and handled using a Catch node.</p>
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</script>
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