Array has a corrupted descriptor

HI , folks

I try to complete a program  with  IDL invoking some function from
C ,it works well when I passing  a  float , double
array , and return a same type with input . Now there is a problem
that  it didn't work while passing a complex array.
And the error "array has a corrupted descriptor" every time. I am a
newer with IDL , and I don't know too much
about that , if anyone can help me, please accept my wonderful
appreciate.

-----------------------c  program-----------------------
DLLIM****T void array_test(int argc, void *argv[])
{
     int nr = *(int *) argv[0];
     int ni = *(int *) argv[1];

 //   int *result =  argv[2];
      IDL_DCOMPLEX *result = argv[2];
    int i , j;
    for(i = 0;i< ni ;  i++)
    {
          for(j=0;j<nr;j++)
          {

                 result[i*ni+j].r = 5   ;
                 result[i*ni+j].i = 10  ;
          }
    }

}

----------------IDL program---------------------


function test1 , row , line
 ;  result= lonarr(row,line)
   result = complexarr(row , line)
   s = call_external('C:\_test\test3\Project3.dll', 'array_test',row ,
line , result)
   return, result
   end

pro test
;p=lonarr(5,5)
p = complexarr(5,5)
p = test1(5,5)
print , p
end