83 lines
3.0 KiB
HTML
83 lines
3.0 KiB
HTML
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<h1>PvaClientChannelPut</h1>s
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<p>
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pvaClientPut is a synchronous wrapper for the pvAccess::ChannelPut API, which is a callback based API.
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Thus it is easier to use than pvAccess::ChannelPut itself.
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</p>
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<p>
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<b>NOTE:</b>
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Except for union fields pvaClientPut takes care of modifying the bitSet associated with
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the data sent to the server.
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</p>
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<p>An instance of PvaClientPut is created via a call to one of the followimg:</p>
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<pre>
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class PvaClientChannel
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...
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{
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...
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PvaClientPutPtr put(std::string const & request = "field(value,alarm,timeStamp)");
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PvaClientPutPtr createPut(std::string const & request = "");
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PvaClientPutPtr createPut(epics::pvData::PVStructurePtr const & pvRequest);
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...
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};
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<p>An instance of <b>PvaClientPut/b> connects to a single channel.
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<b>PvaClientPut</b> has both synchronous methods, which block, and non blocking methods.
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</p>
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<p><b>PvaClientPut</b> has methods:</p>
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<pre>
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connect Calls issueConnect and then waitConnect.
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issueConnect issues a request to the server to create the server side of ChannelPut.
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waitConnect blocks until server responds that it has created the ChannelPut.
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get Calls issueGet and then waitGet.
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issueGet issues a request to the server to get the latest data.
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waitGet waits until the server send a message that the get is complete.
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put Calls issuePut and then waitPut.
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issuePut issues a put request to the server.
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waitPut waits until the server send a message that the put is complete.
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getData get the data.
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</pre>
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<p>
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Note that <b>issueConnect</b>, <b>issueGet</b> and <b>issuePut</b> do not block but all other methods
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do block.
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</p>
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