问题描述
我正在用Fortran编写 iso_c_binding 来调用具有以下原型的C函数
I am writing an iso_c_binding in Fortran to call a C-function with the below prototype
int zmat_run(
const size_t inputsize,
unsigned char *inputstr,
size_t *outputsize,
unsigned char **outputbuf,
const int zipid,
int *ret,
const int iscompress
);
我的问题是如何在此接口中声明 unsigned char ** outputbuf
,这是在c函数内部用于分配输出缓冲区的指针?
My question is how do I declare unsigned char **outputbuf
, a pointer that is used inside the c-function to allocate output buffer, in this interface?
此外,我应该在Fortran中使用哪种数据类型作为传递给此 outputbuf
参数的真实参数?应该可以分配吗?(如果它是在c函数内部分配的)?
Also, what data type I should be using in Fortran as the real parameter to pass to this outputbuf
parameter? should it be allocatable? (if it is allocated inside the c-function)?
我目前正在起草该模块,但尚未对其进行测试(我怀疑它会起作用).
I currently drafted this module, but haven't tested it (I doubt it will work).
module zmatlib
use iso_c_binding, only: c_char, c_size_t, c_ptr, C_NULL_CHAR
interface
integer(c_int) function zmat_run(inputsize, inputbuf, outputsize, outputbuf, zipid, ret, level) bind(C, name="zmat_run")
use iso_c_binding
integer(c_size_t), value :: inputsize
integer(c_int), value :: zipid, level
integer(c_size_t), intent(out) :: outputsize
integer(c_int), intent(out) :: ret
character(kind=c_char), intent(in) :: inputbuf(*)
character pointer(c_ptr),intent(out) :: outputbuf
end function zmat_run
end interface
end module
推荐答案
尝试类型(C_PTR),意图(输出).然后,您将需要使用Fortran函数 c_f_pointer 将C指针与Fortran指针关联.可能是 C_CHAR 类型.
Try type (C_PTR), intent (out). Then you will need to use Fortran function c_f_pointer to associate the C pointer with a Fortran pointer. Probably of type C_CHAR.
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