5. Invoking COPYSTR Procedure from C++

• The function that the program calls from the main program is declared using the extern "C" and __stdcall modifiers:

  
      // The M13_main.cpp file
      extern "C" int __stdcall COPYSTR( char*, char* );
  
  

• The __stdcall calling type assumes that the stack is cleared in the called procedure.

• In the Assembly module, the called procedure must be declared using the PUBLIC directive:

      ; The M13_COPYSTR.ASM file
      .586P
      .MODEL FLAT, stdcall
      PUBLIC COPYSTR