The `REGISTER.ID` function in Excel is an advanced feature that is used to register a dynamic-link library (DLL) or code resource and returns the unique register ID. This function is primarily used by developers for advanced tasks involving external DLLs or code resources, and it’s generally not used in everyday Excel spreadsheet tasks. Here’s a basic idea of how it can be used:
Syntax
REGISTER.ID(file_text, procedure, [type_text])
- `file_text`: The name of the DLL or code resource file.
- `procedure`: The name of the function in the DLL or code resource file.
- `type_text`: Optional. A text string that specifies the data types of the return value and the arguments to the DLL function.
Usage Notes
- Registering a Function:
- You use `REGISTER` (a similar but broader function) initially to declare and register a function from a DLL. `REGISTER.ID` deals with an already registered function.
- Getting the Register ID:
- `REGISTER.ID` returns a unique register ID number for a function that has already been registered, which may be used for later reference within the workbook or by other functions.
- Security Considerations:
- Be cautious when using `REGISTER.ID` as it involves running external code, which could introduce security risks if you are not certain about the source and content of the DLL.
Example
Suppose you have a DLL named `MyFunctions.dll` and within it, there is a function called `AddNumbers`. To get the register ID of this function, after registering it with `REGISTER`, you could use:
=REGISTER.ID("MyFunctions.dll", "AddNumbers")
Practical Applications
- Automated Systems: Can be used in complex Excel applications where interactions with external systems are necessary.
- Custom Functionality: Enables adding custom functionality to Excel by integrating specialized logic from existing code libraries.
If you’re not involved with programming DLLs or advanced spreadsheet functions, you likely won’t need to use the `REGISTER.ID` function. Always ensure any DLLs you work with are from trusted sources to maintain the security and integrity of your system.
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