C / C++ / MFC

void handle_alarm( int )
{
}
...
sgnl_action.sa_handler = handle_alarm;

extern "C" void print(char *)
{
...
}

sgnl_action.sa_handler = (void (*)(int))handle_alarm; /////warning on this line

sgnl_action.sa_handler = (void*)((int)handle_alarm); /////warning on this line

#ifdef  __cplusplus
extern "C" {
#endif

void __cdecl handle_alarm() {
    alarm_timededout_=TRUE;
    ...
    }

sgnl_action.sa_handler

#include <stdio.h>


void (*sa_handler)(int);  // function pointer takes int type
                          // arg and retuns void as we have to 
                          //typecast func handle_alarm to this type

void handle_alarm() {
    printf("helooo");
    }

 void  main(int argc, _TCHAR* argv[])
 {
       handle_alarm(); //normal call to function
       sa_handler = (void (*)(int))handle_alarm; // compatible typecast
       sa_handler(0);  // call with a function pointer
                       // as it takes one argument we have 
                       //to pass a dummy arg.
 }

::GetClassName(hWnd, szClassName, 12);
    TRACE("%s\n",szClassName);

skaboFer wrote:

WriteCommMsg(MsgStr * msg)", I don't know were to declare the necesary
variables

skaboFer wrote:

if I'd have to save the last send msg

skaboFer wrote:

I mean, my doubt is what is the lifetime of the variables in a dynamic win32 dll.

WriteCommMsg(MsgStr * msg)

MsgStr myMsgString = "message to write"; // setup the message string
WriteCommMsg(&myMsgString);              // send it to the library function

skaboFer wrote:

could I just declare a static global variable/object?

skaboFer wrote:

where should I declare

the serialPort variable?