How to make a user-defined structure and creat a pointer for the same thing

Function

The prototype of the dll function is

long unsigned PassThruIoctl (unsigned long A, long B unsigned, void * pvar1, void * pvar2);

' void * pvar1 ' and ' Sub * pvar2 ' are pointers to different Structures. The value of "unsigned" long B will determine what kind of Structure is the pointer.

An example of structure is given below, when pvar1 is the pointer to SCONFIG_LIST.

typedef struct

{

ParameterID long unsigned;    This entry of the dll

Value of long type is unsigned;          This is a release of dll

} SCONFIG;

typedef struct

{

unsigned long NumOfParams;    the no. of elements in the array (SCONFIG)

(entry)

SCONFIG * ConfigPtr;           the pointer to array of SCONFIG

(entry)

} SCONFIG_LIST;

The function is supposed to get the values of the configuration parameters (leave a device external interfacing).

When I tried to run the service as shown in the attached VI, I always find myself with the error. The error I get is says something about the DLL which damages the memory of Lab View.

Fixed mising. Can you post it again?

Tags: NI Software

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