Declare Currency Type to Be Double When Returning from DLL

ID: Q72274

The information in this article applies to:

Microsoft Visual Basic Standard and Professional Editions for Windows, versions 2.0, 3.0
Microsoft Visual Basic programming system for Windows, version 1.0

SUMMARY

When using Microsoft Visual Basic for Windows, if you want to pass a parameter to a dynamic link library (DLL) routine, or receive a function return value of type Currency from a DLL routine written in Microsoft C, the parameter or function returned should be declared as a "double" in the C routine.

NOTE: C does not support the Basic Currency data type, and although specifying the parameter as type "double" in C will allow it to be passed correctly, you will have to write your own C routines to manipulate the data in the Currency variable. For information on the internal format of the Currency data type, query in the Microsoft Knowledge Base using the following words:

Basic and Currency and internal and format

MORE INFORMATION

When creating a DLL function that either receives or returns a Currency data type, it may be useful to include the following declaration:


   typedef double currency;

Based on this typedef, a sample DLL routine to return a currency value might be declared as follows:


   currency FAR pascal test(...);

Additional query words: 2.00 3.00

Keywords :
Version : WINDOWS:1.0,2.0,3.0
Platform : WINDOWS
Issue type :