Documentation

The type of external functions defined in another component of a program must be explicitly described. The absence of such a definition may result in errors during the compilation, linkage, or execution of the program. While describing an external object, the keyword of #import must be used with the reference to the module.

#import "user32.dll"
  int     MessageBoxA(int hWnd ,string szText,string szCaption,int nType);
  int     SendMessageA(int hWnd,int Msg,int wParam,int lParam);
#import "lib.ex4"
  double  round(double value);
#import

Import can be used to easily describe functions called from external DLLs or compiled EX4 libraries.

Pointers to variables can be passed to imported dll functions. Data of the string type are passed as a pointer to the corresponding memory block (one should keep in mind that internal representation of string data consists of two parts: the memory block length and the memory block pointer). If there is a need to pass data of the int or double type, then the one-dimensional array of the corresponding type should be passed by reference as a parameter.

Example:

#import "some_lib.dll"
  void    PassIntegerByref(int& OneInt[]);
#import
int start()
  {
   int array[1];
//...
   PassIntegerByref(array);
   Print(array[0]);
//...
  }