вопрос по external и др

#define WS_CHILD 1073741824
#define WS_VISIBLE 268435456
#define WS_BORDER 8388608
#define WS_VSCROLL 2097152
#define LBS_EXTENDEDSEL 2048
#define LB_ADDSTRING 384
#define LB_GETCOUNT 395
#define LB_SETTOPINDEX 407
external(INT, "CreateWindow", "CreateWindowExA", "User32.dll" );

int list1;
createdialog(2);
showdialog(2, "LOG", 100, 100, 330, 300, 1, 1);

int X=0;
loop()
{
add_list("Переменная X равна "+format(X));
sleep(100);
X++;
}

function getmessage(2, WM_CREATE)
{
list1=CreateWindow(0, "LISTBOX", "", WS_BORDER | WS_VSCROLL | WS_CHILD | WS_VISIBLE | LBS_EXTENDEDSEL , 10, 10, 300, 250, gethwnd(2), 0, 0, 0);
}

function add_list(string s)
{
new char c[size(s)+1];
strcpy(#c[0], s);
sendmessage(LB_ADDSTRING, 0, address(#c[0]), formatiw(list1)); // добавить строку в список
sendmessage(LB_SETTOPINDEX, sendmessage(LB_GETCOUNT, 0, 0, formatiw(list1))-1, 0, formatiw(list1)); // скролл
delete c;
}

#define WS_VISIBLE 268435456
#define WS_BORDER 8388608
#define WS_VSCROLL 2097152
#define WS_SIZEBOX 262144
#define WS_SYSMENU 524288
#define WS_MINIMIZEBOX 131072
#define WS_MAXIMIZEBOX 65536

#define LBS_EXTENDEDSEL 2048
#define LB_ADDSTRING 384
#define LB_GETCOUNT 395
#define LB_SETTOPINDEX 407
external(INT, "CreateWindow", "CreateWindowExA", "User32.dll" );

win log;
int list1;

int X=0;
loop()
{
add_list("Переменная Xxxxxxxxxxxxxxxxxxxxxxxx равна "+format(X));
sleep(1);
X++;
}

function add_list(string s)
{
if(window("LOG")==0)
list1=CreateWindow(0, "LISTBOX", "LOG", WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_SYSMENU | WS_SIZEBOX | WS_BORDER | WS_VSCROLL | WS_VISIBLE | LBS_EXTENDEDSEL , 100, 100, 400, 300, 0, 0, 0, 0);
else
{
log=window("LOG");
list1=formatwi(log);
}

new char c[size(s)+1];
strcpy(#c[0], s);
sendmessage(LB_ADDSTRING, 0, address(#c[0]), formatiw(list1)); // добавить строку в список
sendmessage(LB_SETTOPINDEX, sendmessage(LB_GETCOUNT, 0, 0, formatiw(list1))-1, 0, formatiw(list1)); // скролл
delete c;
}