When you declare an external function, the data types of the arguments must correspond with the data types declared in the function's source definition. The following table lists C++ data types and the corresponding PowerBuilder data types.

The PowerBuilder data type you select, depends on:

	The data type in the DLL for the function.
	Platform ( running on a 16-bit or 32-bit platform ).

The 32-bit platforms that PowerBuilder supports are Windows 95, Windows NT, Macintosh, and UNIX (Solaris). The 16-bit platform that PowerBuilder supports is Windows 3.1x.

Data type in source code	Platform	PowerBuilder data type
* (any pointer)	Windows 3.1 , 95, NT	Long
	Macintosh	UnsignedLong.
Handle	Windows 3.1	UnsignedInteger
	32-bit Windows ( 95 & NT ), Macintosh	UnsignedLong
char *	All	Blob
Strings
char	All	char
string	All	String
Boolean	Windows 3.1 , 95, NT	Boolean
	Macintosh	char
short	All	Integer
unsigned short	All	Integer
int	Windows 3.1	Integer
	Windows 95, NT, Unix	Long
unsigned int	Windows 3.1	Integer
	Windows 95, NT, Unix	Long
long	All	Long
unsigned long	All	Long
float	All	Real
double	Only Windows 95/NT	Double
date	All	Not Supported
DateTime	All	Not Supported
time	All	Not Supported

Advanced PowerBuilder

Data types for External Function Arguments