What's the details of the return data after calling Application.RegisteredFunctions?

Question

Application.RegisteredFunctions returns 3 columns. The last column is described as "Strings specifying the data types of the return values, and the number and data types of the arguments". Does anybody know the details of it? Is there a table
showing which string specifies which data type? Thanks!

Answer 1

From MSDN:
Data Types
The pxTypeText argument specifies the data type of the return value and the data types of all arguments to the DLL function or code resource. The first character of
pxTypeText specifies the data type of the return value. The remaining characters indicate the data types of all the arguments. For example, a DLL function that returns a floating-point number and takes an integer and a floating-point number as
arguments would require "BIB" for the pxTypeText argument.
The data types and structures used by Excel to exchange data with XLLs are summarized in the following two tables.
The first table lists the types supported in all versions of Excel.
Data type
Pass by value
Pass by ref (pointer)
Comments
Boolean
A
L
short [int] (0=false or 1=true)
double
B
E
char *
C, F
Null-terminated ASCII byte string
unsigned char *
D, G
Counted ASCII byte string
unsigned short [int]
H
16-bit WORD
[signed] short [int]
I
M
16-bit signed integer
[signed long] int
J
N
32-bit signed integer
FP
K
Floating-point array structure
Array
O
Three arguments are passed:
unsigned short int *
unsigned short int *
double []
XLOPER
P
Variable-type worksheet values and arrays
R
Values, arrays, and range references
In Excel 2007 the following data types were introduced to support the larger grids and long Unicode strings.
Data type
Pass by value
Pass by ref (pointer)
Comments
unsigned short *
C%, F%
Null-terminated Unicode wide-character string
unsigned short *
D%, G%
Counted Unicode wide-character string
FP12
K%
Larger grid floating-point array structure
Array
O%
Three arguments are passed:
signed int * / RW *
signed int * / COL *
double []
XLOPER12
Q
Variable-type worksheet values and arrays
U
Values, arrays, and range references
Starting in Excel 2010 the following data types were introduced:
Data Type
Pass by value
Pass by ref (pointer)
Comments
XLOPER12
X
The asynchronous handle is used to track a pending asynchronous function call by Excel and the XLL.The existence of the parameter type in the type string also designates the function as asynchronous.For more information about asynchronous functions, see
Asynchronous User-Defined Functions.
The string types F, F%, G, and G% are used for arguments that are modified-in-place.
When working with the data types displayed in the previous table, be aware of the following:
The C-language declarations assume that your compiler uses 8-byte doubles, 2-byte short integers, and 4-byte long integers by default.
All functions in DLLs and code resources are called using the __stdcall calling convention.
Any function that returns a data type by reference, that is, that returns a pointer to something, can safely return a null pointer. Excel interprets a null pointer as a #NUM! error.
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