Caling windows DLL func from go :: parameter is incorrect

[amit....@gmail.com]

I am trying to call a DLL from go and I get an error "The parameter is incorrect" error when I try to call this function 

HANDLE  Myopen(const char *filter, LAYER layer, INT16 priority, UINT64 flags)

is my signature in the C file 

I call from golang using this 

Open(lazyP*syscall.LazyProc, filter string, layer int16, priority uint16, flags uint64) error {

 r1, r2, lastError := lazyP.Call(uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(filter))),
  uintptr(layer),
  uintptr(priority),
  uintptr(flags),
 )

 fmt.Println("LastError", lastError)

 fmt.Println("R1", r1)

 fmt.Println("R2", r2)

 return nil

}

What am I missing here. This is the first time I am trying to load windows dlls so a little confused about what am I missing here 

Regards
Amit

[Tamás Gulácsi]

What is LAYER?
is priority an int16 or an uint16?

[Oryan Moshe]

Seems to me like type issues as well, doesn't seem like it for winapi to receive int16. 

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[amit....@gmail.com]

layer is an enum in the dll. 

Gets converted to uint32 inside the dll before it makes the windows api call. 

priority is exposed as int16 in the exported dll api 

Regards

Amit

[Amit Limaye]

is the const char * a problem my string is not passed as const ?
-SIGTERM
amit

Humanity's first sin was faith, Its first virtue doubt

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[Oryan Moshe]

It doesn't look like you turn it to const anywhere, just a pointer. Is the pointer conversion returning a const? 

[Amit Limaye]

the dll exported function signature takes a const char *
while I am passing a string
my golang call signature

Open(lazyP*syscall.LazyProc, filter string, layer uint32, priority
int16, flags uint64) error

which I use to make this call

r1, r2, lastError :=
lazyP.Call(uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(filter))),
uintptr(layer),
uintptr(priority),
uintptr(flags),
)

and my dll exported func signature is

HANDLE Open(const char *filter,DIVERT_LAYER layer,
INT16 priority, UINT64 flags)

-SIGTERM
amit

Humanity's first sin was faith, Its first virtue doubt

[Oryan Moshe]

Can you try casting your string to a c char? 

(*C.char)(unsafe.Pointer(string))