Function editor does not support the pointer to the digital type

Am I missing something or is it true that the CVI function Panel Editor does not support specifying a type parameter as a pointer of type number?

I see no reason why he wouldn't or shouldn't.  It supports the pointer to char.  And it supports a table name (which, in C, is a pointer to the first element of the array).

I guess I could use the array form as a pointer, but surely it's confusing when dealing with a simple pointer to a numeric scalar type.

I am using the function Panel Editor only for the purpose of creating a dictionary of type so I can call functions DLL in VB.  Y at - he know somewhere how CVI types could are mapped to the VB types when you use the type dictionary?   for example, what happens if I use an unsigned int in a function parameter (VB does not support unsigned integers)?

Menchar

Hi Menchar,

To create a pointer to an integer as a parameter to a function panel, you have two different options.

First of all, all output parameters are defined as the default pointers.  So if you create an output parameter of type "int", he creates a ' int *' parameter.

Second, if you want it to appear in the entry list, you can create a data type in CVI which will appear at the bottom of the list.  Data types to change your data types, go to the Options"(you must have a function Editor tab open and selected Panel to make this option available).  Enter the name of the type (in this case ' int * ') and click the Add button.  The new "int *" option should now appear at the bottom of the list.

Third, you can use the array form (int []), but as you say, which can be confusing for other people looking at the code.  Or the other of the two first options are better choices.

As for your second question, here's a link to a page MSDN showing types in Visual Basic and their representations .NET: http://msdn.microsoft.com/en-us/library/47zceaw7 (VS.80) .aspx.  This allows to make a comparison between VB and ANSI C data types.  For example, to ask on unsigned integers, and this site shows that Visual Basic has an Integer type (-2,147,483,648 through 2,147,483,64) and an unsigned return, UInteger (between 0 and 4 294 967 295).  From what I can tell, VB has signed versions of all its digital representations.  You can then take this with a list of ANSI C data types to convert between the two.  A list of ANSI C data types can be found here: http://www.exforsys.com/tutorials/c-language/c-programming-language-data-types.html

Tags: NI Software

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