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The LabVIEW Import Shared Library Wizard converts the following shared library data types to the indicated LabVIEW data types.

• numeric and numeric pointer
• string and string pointer
• void and void pointer
• Boolean and Boolean pointer
• cluster and cluster pointer

For return values in the shared library functions, the Input/Output type can only be Output. The Configure VIs and Controls page of the Import Shared Library wizard displays an exclamation point _import_shared_library.html">Example: Importing Functions from a Shared Library File for more details.

Numeric

C Data Type	Icon	I/O Type	LabVIEW Control Type	Pass Type	LabVIEW Representation	Unsigned Representation (unsigned int)
__int8		Input	Numeric	Value	I8	U8
__int16		Input	Numeric	Value	I16	U16
__int32		Input	Numeric	Value	I32	U32
__int64		Input	Numeric	Value	I64	U64
char		Input	Numeric	Value	I8	U8
short		Input	Numeric	Value	I16	U16
int		Input	Numeric	Value	I32	U32
long		Input	Numeric	Value	I32	U32
float		Input	Numeric	Value	SGL
double		Input	Numeric	Value	DBL

Numeric Pointer

C Type	Icon	I/O Type	I/O Type (const int*)	LabVIEW Control Type	Pass Type	LabVIEW Representation	Unsigned Representation (unsigned int*)
__int8 *		Input/Output	Input	Numeric	Pointer	I8	U8
__int16 *		Input/Output	Input	Numeric	Pointer	I16	U16
__int32 *		Input/Output	Input	Numeric	Pointer	I32	U32
__int64 *		Input/Output	Input	Numeric	Pointer	I64	U64
short *		Input/Output	Input	Numeric	Pointer	I16	U16
int *		Input/Output	Input	Numeric	Pointer	I32	U32
long *		Input/Output	Input	Numeric	Pointer	I32	U32
float *		Input/Output	Input	Numeric	Pointer	SGL
double *		Input/Output	Input	Numeric	Pointer	DBL

String and String Pointer

C Type	Icon	I/O Type	LabVIEW Control Type
char*		Input/Output	String
Char []		Input/Output	String
const char *		Input	String
const char []		Input	String

Void and Void Pointer

C Type	Icon	I/O Type	LabVIEW Control Type	Pass Type	LabVIEW Representation
void		void means no control is needed and can appear only as the return control
void*		Input/Output	Numeric	Value	U32
const void *		Input	Numeric	Value	U32

Boolean and Boolean Pointer

C Type	Icon	I/O Type	LabVIEW Control Type	Pass Type
bool		Input	Boolean	Value
bool *		Input/Output	Boolean	Pointer
const bool *		Input	Boolean	Pointer

Cluster and Cluster Pointer

C Type	Icon	I/O Type	LabVIEW Control Type	Pass Type
struct		Input	Cluster	Value
Struct *		Input/Output	Cluster	Pointer
const struct *		Input	Cluster	Pointer