Probel with call library function: I have a dll based on a complicated struct data type. How can I pass this structure?

Question

The data type is
typedef enum {false, true} bool;
typedef float flt4;
typedef double flt8;
typedef int i32s;
typedef unsigned int i32u;
typedef short int i16s;
typedef unsigned short i16u;
typedef signed char i08s;
typedef unsigned char i08u;
struct t_UnwrapData {
struct {
i08u flags;
i16u unwrap_m;
i08u weight_m;
} status;
flt4 *ph2pi;
flt4 *weight;
flt4 *gamma;
flt4 *phase;
i08u *flags;
i08u *neigh;
i32s neighOfst[8];
i32s r,c;
i32s x0,y0,xSz,ySz;
flt8 unwTime;
flt4 binCut;
Please Could someone help me suggesting how I pass this dat
a type to call library function?

Answer 1

Hi Setu,
Here is a solution that I have been playing to return back an array of clusters
typedef struct
int32 dimSize;
uInt8 array[1];
} LVU8;
typedef LVU8 **LVU8Hdl;
typedef struct
U32 DeviceId;
U32 VendorId;
U32 BusNumber;
U32 SlotNumber;
LVU8Hdl SerialNumber;
} LVDEVICE_LOCATION;
typedef LVDEVICE_LOCATION **LVDEV_LOC_HANDLE;
typedef struct
int32 dimSize;
LVDEVICE_LOCATION cluster_array[1];
} LVDEV_LOC_ARRAY;
typedef LVDEV_LOC_ARRAY **LVDEV_LOC_ARRAY_HANDLE;
LVPLX_API void GetAllDevices(LVDEV_LOC_ARRAY_HANDLE cluster_array)
int i,j;
int numDevices = 3;
DSSetHandleSize(cluster_array, sizeof(int32)+3*(sizeof(LVDEV_LOC_ARRAY)+(sizeof(int32)+16*sizeof(L
VU8))));
(*cluster_array)->dimSize = 3;
(*((*cluster_array)->cluster_array[0]).SerialNumber)->dimSize =16;
(*((*cluster_array)->cluster_array[1]).SerialNumber)->dimSize =16;
(*((*cluster_array)->cluster_array[2]).SerialNumber)->dimSize =16;
for(i=0; i<3; i++)
((*cluster_array)->cluster_array[i]).BusNumber = i;
((*cluster_array)->cluster_array[i]).VendorId = i*5;
for(j=0;j<16;j++)
(*((*cluster_array)->cluster_array[i]).SerialNumber)->array[j] = (10*j)+i;
The code doesnt do much but returns back 3*cluster which the array in my cluster is sized for 16. The problem I've been having , was ensuring I have allocated enough memory to handle the complete structure. This works for me, now all I have to do is put the real code in which get my array of data from the instruments.
Hope it helps
Regards
Ray Farmer
Regards
Ray Farmer