Hi
I have this structure in C created by rsl libray
typedef struct {
Radar_header
<file:///home/martin/Scaricati/rsl-v1.50/doc/RSL_radar_header_struct.html> h;
Volume <file:///home/martin/Scaricati/rsl-v1.50/doc/RSL_volume_struct.html>
**v;
} Radar;
Using cgo i read the structure with
Radar *readRad(char *fname) {
return RSL_anyformat_to_radar(fname, NULL);
}
and call this function in go
RPointer := C.readRad(C.CString(os.Args[1]))
and i see the structure
with fmt.Printf("%T",RPointer) => *main._Ctype_struct___0
with fmt.Printf("%+v",RPointer) => &{h:{} _:[0 0 0 0] *v:0xe59b60*}
The field is a **C.Volume pointer.
The question is: it's possible with Golang list all C.Volume's struct pointed ?
like this
for i := 0; i < int(RPointer.h.nvolumes); i++ {
pv := *RPointer.v[i]
fmt.Printf("\nVOLUME Sweep %+v\n", *pv.sweep)
}
the exit is type **C.struct___2 does not support indexing
I tried with unsafe.Pointer using
*puint1 := unsafe.Pointer(RPointer.v)*
*sizep := unsafe.Sizeof(RPointer.v)fmt.Printf("\npuint [%+v] -> + sizeoff
[%+v]\n", puint1, unsafe.Pointer(uintptr(puint1)+sizep))*
and printf is puint [0xe59b60] -> + sizeoff [0xe59b68]
there is a casting like this
volume2 := (*C.Volume)(*unsafe.Pointer(uintptr(puint1) + sizep))
Thanks
Alex
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