Handle окна.

/*
// ENUMWIND.C
// Перечисляет окна
*/

#include <windows.h>
HANDLE log;
int maxlevel;

BOOL CALLBACK EnumProc(HWND wnd,LPARAM lp) {
unsigned char buf[124];
unsigned long i,ii;
int j;
RECT r;

if(lp>maxlevel) return(FALSE);
for(j=0;j<lp;j++) WriteFile(log,"\t",1,&i,NULL);
if(IsWindowVisible(wnd)) WriteFile(log,"+",1,&i,NULL);
else WriteFile(log," ",1,&i,NULL);
i=GetClassName(wnd,buf,120);
WriteFile(log,buf,i,&i,NULL);
i=GetWindowText(wnd,buf,120);
if((i>0)&&(buf[0]!='\0')) {
   WriteFile(log,".",1,&ii,NULL);
   WriteFile(log,buf,i,&i,NULL);
}
WriteFile(log,"(",1,&i,NULL);
if(GetWindowRect(wnd,&r)) {
   itoa(r.left,buf,10);
   WriteFile(log,buf,strlen(buf),&i,NULL);
   WriteFile(log,",",1,&i,NULL);
   itoa(r.top,buf,10);
   WriteFile(log,buf,strlen(buf),&i,NULL);
   WriteFile(log,"-",1,&i,NULL);
   itoa(r.right,buf,10);
   WriteFile(log,buf,strlen(buf),&i,NULL);
   WriteFile(log,",",1,&i,NULL);
   itoa(r.bottom,buf,10);
   WriteFile(log,buf,strlen(buf),&i,NULL);
}
else WriteFile(log,"?",1,&i,NULL);
WriteFile(log,")\r\n",3,&i,NULL);
EnumChildWindows(wnd,EnumProc,lp+1);
return(TRUE);
}//=============================================

int WINAPI WinMain(HINSTANCE hi,HINSTANCE phi,LPSTR cmd,int ncmd) {
HWND dt;
maxlevel=atoi(cmd);
if(maxlevel<=0) maxlevel=1;
log=CreateFile("enumwind.txt",GENERIC_WRITE,FILE_SHARE_READ,NULL,CREATE_ALWAYS,0,NULL);
if(log==INVALID_HANDLE_VALUE) return(0);
dt=GetDesktopWindow();
EnumProc(dt,(LPARAM)0);
CloseHandle(log);
return(0);
}