C / C++ / MFC

va_list args;
va_start(args, pszMessage);

Trace(0, pszMessage, args);
va_end(args);

#define GetParam(arg,num) (((int *)(&arg))[num])

func(const char * format, ...)

func("%d %s %c", 123, "123", 's');// the %d%s%c is not importent 

int a=(int)GetParam(format,1);  // 123
char * b=(char *)GetParam(format,2); // "123"
char c=(char)GetParam(format,3); // 's'

#define GetParam(arg,num) (((int *)(&arg))[num])
func1(const char *lll, ...);

func1(const char *lll, ...)
{
    __int64 l_nNumber;  // a 64 bits unit to store the data
    int pos=0; // the current position of the args: 0=lll, 1=next val,2= 3rd,...
 
    ((__int32 *)&l_nNumber)[0]= GetParam(lll, ++pos); // copy the 1st 32bits
    ((__int32 *)&l_nNumber)[1]= GetParam(lll, ++pos); // copy the 2st 32bits
 
    //BTW: works same way on double
}