4 File Transfer Model ToC Previous

4.4 Temporary file transfer ToC Previous

4.4.3 GenerateFileForRead ToC Previous Next

GenerateFileForRead is used to start the read file transaction. A successful call of this Method creates a temporary FileType Object with the file content and returns the NodeId of this Object and the file handle to access the Object.

Signature

GenerateFileForRead(
[in]  BaseDataType 	generateOptions
[out] NodeId 		fileNodeId
[out] UInt32 		fileHandle
[out] NodeId 		completionStateMachine
);
Argument Description
generateOptions    The optional parameter can be used to specify server specific file generation options. To allow such options, the Server shall specify a concrete DataType in the Argument Structure for this argument in the instance of the Method.   If the DataType is BaseDataType, the Client shall pass Null for this argument.   Examples for concrete DataTypes are      OptionSet Used to provide a bit mask for file content selection      String Can be used to provide a string filter or a regular expression      Structure Can be used to provide a structure with create settings e.g. to create a report   Enumeration Can be used to provide a list of options
fileNodeId NodeId of the temporary file.
fileHandle    The fileHandle of the opened TransferFile.The fileHandle can be used to access the TransferFile Methods Read and Close.
completionStateMachine    If the creation of the file is completed asynchronous, the parameter returns the NodeId of the corresponding FileTransferStateMachineType Object.   If the creation of the file is already completed, the parameter is null.If a FileTransferStateMachineType Object NodeId is returned, the Read Method of the file fails until the TransferState changed to ReadTransfer.

Method Result Codes (defined in Call Service)

Result Code Description
Bad_UserAccessDenied See OPC 10000-4 for a general description.

Table 14 specifies the AddressSpace representation for the GenerateFileForRead Method.

Table 14 – GenerateFileForRead Method AddressSpace definition

Attribute Value
BrowseName GenerateFileForRead
References NodeClass BrowseName DataType TypeDefinition ModellingRule
HasProperty Variable InputArguments Argument[] PropertyType Mandatory
HasProperty Variable OutputArguments Argument[] PropertyType Mandatory
Conformance Units          
Base Info TemporaryFileTransferType Base          

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