Protected function "AcceptInput", proved to the user DLL for registering input types acceptable by the DLL for computation. This function should be invoked in Init, and the registered acceptable input types will be passed to Visual Signal's ExternalDll module via getDllInfo. Visual Signal will use this information to determine whether an input connection is valid or not.

Protected function "AcceptInput", proved to the user DLL for registering input types acceptable by the DLL for computation. This function should be invoked in Init, and the registered acceptable input types will be passed to Visual Signal's ExternalDll module via getDllInfo. Visual Signal will use this information to determine whether an input connection is valid or not.

Interface for exported function "compute", used by Visual Signal's ExternalDll module to execute the actual computation provided by the user DLL. This function just calls the protected function DoCompute, which the user DLL must override with own implementation. External properties, input and output data are processed by Visual Signal before and after the execution of this function. User should expect _inputData to contain the input data and update _outputData to sent to Visual Signal. User should also expect _properties to contain properties from Visual Signal and use UpdateProperty(String, Object) to update properties to Visual Signal.

Protected virtual function "DoCompute", intended to be overridden by the inherited user DLL class to provide the actual computation. This function is called by the exported function compute which is in turn used by Visual Signal's ExternalDll module to start computation.

Interface for exported function "doubleClick", used by Visual Signal's ExternalDll module to handle the callback when user double-clicks the corresponding Visual Signal component. This function just calls the protected function OnDoubleClick, which the user DLL can override with own implementation. Like compute, external properties are processed by Visual Signal before and after the execution of this function; however, input and output data are not processed. User should expect _properties to contain properties from Visual Signal and use UpdateProperty(String, Object) to update properties to Visual Signal.

Exported function "getDllInfo()", used by Visual Signal's ExternalDll module to obtain DLL info such as name, version, API version, language, license control and properties.

Protected function "GetInputCoords", provided to the user DLL to obtain the input coordinates.

Protected function "GetInputDataExtensionKeys", provided to the user DLL to obtain the input data extension.

Protected function "GetInputDataExtensionKeys", provided to the user DLL to obtain the available input data extension keys.

Protected function "GetInputDataRe", provided to the user DLL to obtain the imaginary part of the input data.

Protected function "GetInputDataRe", provided to the user DLL to obtain the real part of the input data.

Exported function "getOutputCoordinates", used by Visual Signal's ExternalDll module to obtain the output data coordinates from the user DLL.

Interface for exported function "getOutputDataIm", used by Visual Signal's ExternalDll module to obtain the output data (imaginary part) from the user DLL.

Exported function "getOutputDataRe", used by Visual Signal's ExternalDll module to obtain the output data (real part) from the user DLL.

Exported function "getOutputDescriptor", used by Visual Signal's ExternalDll module to obtain output descriptor from the user DLL.

Exported function "getProperties", used by Visual Signal's ExternalDll module to obtain property values from the user DLL.

(Deprecated) Protected function "GetPropertyValue", provided to the user DLL for retrieving the current property values. This function is usually invoked in the DoCompute function after the computation stage. This is deprecated. Property values can now be accessed like regular C# public properties.

Exported function "getViewerPanel()", used by Visual Signal's ExternalViewer module to obtain external viewer object created by the user Dll

Protected virtual function "Init", intended to be overridden by the inherited user DLL class to provide the initialization function. This function is called by the exported function getDllInfo.

Protected virtual function "OnDoubleClick", intended to be overridden by the inherited user DLL class to provide the actual computation. This function is called by the exported function doubleClick which is in turn used by Visual Signal's ExternalDll module to handle callback when user double-clicked on the module.

(Deprecated) Protected function "RegisterProperty", proved to the user DLL for registering properties used by the DLL computation. This function should be invoked in Init, and the registered properties will be passed to Visual Signal's ExternalDll module via getDllInfo and become available in the module's property dialog for editing. The current values will be communicated back and forth between ExternalDll module and the user DLL via setProperties(String) and getProperties exported functions. This is deprecated. Property values can now be defined like regular C# properties, with appropriate attributes attached to the properties to define their categories, display names, descriptions, etc. Properties must be public and browsable.

Exported function "setBackColor()", used by Visual Signal's ExternalViewer module to set external viewer background color

Override protected function SetExtendedInfo(XmlDocument) to set additional viewer-specific root attributes. This function is called by the exported function getDllInfo.

Exported function "setInputCoordinates", used by Visual Signal's ExternalDll module to set input coordinates in the user DLL.

Exported function "setInputDataIm", used by Visual Signal's ExternalDll module to set the input data (imaginary part) in the user DLL.

Exported function "setInputDataRe", used by Visual Signal's ExternalDll module to set the input data (real part) in the user DLL.

Exported function "setInputDescriptors", used by Visual Signal's ExternalDll module to set input descriptors in the user DLL.

Protected function "SetOutputCoords", provided to the user DLL to set the output coordinates.

Protected function "SetOutputDataExtension", provided to the user DLL to set the output data extension info.

Protected function "SetOutputDataIm", provided to the user DLL to set the imaginary part of the output data.

Protected function "SetOutputDataRe", provided to the user DLL to set the real part of the output data.

Exported function "setProperties", used by Visual Signal's ExternalDll module to set property values in the user DLL.

Exported function "setTitle()", used by Visual Signal's ExternalViewer module to set external viewer title

(Deprecated) Protected function "UpdateProperty", provided to the user DLL for updating the current property values. This function is usually invoked in the DoCompute function after the computation stage. This is deprecated. Property values can now be updated like regular C# public properties.

Virtual hook function "UpdateViewerProperty()". This function can be overridden in user's code to provide custom behaviour for updating viewer properties.