HWND GetHwndByPid(DWORD dwProcessID) {     HWND h = GetTopWindow(0);     HWND retHwnd = NULL;    while ( h )      {         DWORD pid = 0;         DWORD dwTheardId = GetWindowThreadProcessId( h,&pid);          if (dwTheardId != 0)        {             if ( pid == dwProcessID && GetParent(h)==NULL && ::IsWindowVisible(h))                     {                retHwnd = h;    //会有多个相等值                //    /*                char buf[MAX_PATH] = {
   0};                sprintf(buf,"%0x",h);                MessageBox(NULL,buf,"提示",MB_OK);                //    */            }        }        h  = GetNextWindow(h,GW_HWNDNEXT);    }    return retHwnd;}

网上的基本是全身错误的那个版本。