c++ - ReOpen window from main window. -


i have main window open. created me using visual studio. attempting have main screen 9 12 buttons. these buttons open other windows. attempting 1 button "inventorybtn". inventory window open , able close it. second time try open window error. seems window registered , cant recreated. doing incorrectly? stepped thru , aw "destroy:" being called. second time try show inventory window handle uninitialized. 

#include "stdafx.h" #include "vehmanager.h" #include "m_inventory.h"   #define max_loadstring  100 #define invwindowbtn 101  #define invbtn 103  using namespace boost::gregorian;  hinstance hinst;  wchar sztitle[max_loadstring];   wchar szwindowclass[max_loadstring];   atom                myregisterclass(hinstance hinstance);  bool                initinstance(hinstance, int);  lresult callback    wndproc(hwnd, uint, wparam, lparam);  int_ptr callback    about(hwnd, uint, wparam, lparam);  lresult callback    invwindowprocess(hwnd, uint, wparam, lparam);   hwnd handleforinvwin;  wndclassex wxinv;   void createinventorywindow();    int apientry wwinmain(_in_ hinstance hinstance, _in_opt_ hinstance hprevinstance, _in_ lpwstr lpcmdline, _in_ int       ncmdshow) {     unreferenced_parameter(hprevinstance);     unreferenced_parameter(lpcmdline);       loadstringw(hinstance, ids_app_title, sztitle, max_loadstring);     loadstringw(hinstance, idc_vehmanager, szwindowclass, max_loadstring);     myregisterclass(hinstance);      if (!initinstance (hinstance, ncmdshow))     {         return false;     }      haccel hacceltable = loadaccelerators(hinstance, makeintresource    (idc_vehmanager));      msg msg;       while (getmessage(&msg, nullptr, 0, 0))     {         if (!translateaccelerator(msg.hwnd, hacceltable, &msg))         {             translatemessage(&msg);             dispatchmessage(&msg);         }     }      return (int) msg.wparam; }  atom myregisterclass(hinstance hinstance) {     wndclassexw wcex;      wcex.cbsize = sizeof(wndclassex);      wcex.style          = cs_hredraw | cs_vredraw;     wcex.lpfnwndproc    = wndproc;     wcex.cbclsextra     = 0;     wcex.cbwndextra     = 0;     wcex.hinstance      = hinstance;     wcex.hicon          = loadicon(hinstance, makeintresource(idi_vehmanager));     wcex.hcursor        = loadcursor(nullptr, idc_arrow);     wcex.hbrbackground  = (hbrush)(color_window+1);     wcex.lpszmenuname   = makeintresourcew(idc_vehmanager);     wcex.lpszclassname  = szwindowclass;     wcex.hiconsm        = loadicon(wcex.hinstance, makeintresource(idi_small));      return registerclassexw(&wcex); }  bool initinstance(hinstance hinstance, int ncmdshow) {    hinst = hinstance;       hwnd hwnd = createwindoww(szwindowclass, sztitle, ws_overlappedwindow,       cw_usedefault, 0, cw_usedefault, 0, nullptr, nullptr, hinstance, nullptr);      if (!hwnd)    {         messageboxa(null, "main window creation failed.", "904.vehiclemanager", mb_ok | mb_iconinformation);         return false;    }     showwindow(hwnd, ncmdshow);    updatewindow(hwnd);     return true; }  lresult callback wndproc(hwnd hwnd, uint message, wparam wparam, lparam lparam) {     hfont hfdefault;     switch (message)     {         case wm_create:         {               hwnd hinvbtn = createwindowex(null, l"button", l"inventory", ws_tabstop | ws_visible | ws_child | bs_defpushbutton,                 50, 220, 100, 24, hwnd, (hmenu)invbtn, getmodulehandle(null), null);             if (hinvbtn == null)                 messageboxa(hwnd, "could not create inventory button", "904.vehclemanager", null);             hfdefault = (hfont)getstockobject(default_gui_font);             sendmessage(hinvbtn, wm_setfont, (wparam)hfdefault, makelparam(false, 0));          }         case wm_command:             {                 int wmid = loword(wparam);                  switch (wmid)                 {                 case invbtn:                 {                      createinventorywindow();                     break;                 }                  case idm_about:                     dialogbox(hinst, makeintresource(idd_aboutbox), hwnd, about);                     break;                 case idm_exit:                     destroywindow(hwnd);                     break;                 default:                     return defwindowproc(hwnd, message, wparam, lparam);                 }             }             break;         case wm_rbuttondown:             messagebox(null, l"right button mouse clicks not allowed.", l"904.vehiclemanager", null);             break;         case wm_paint:             {                 paintstruct ps;                 hdc hdc = beginpaint(hwnd, &ps);                  endpaint(hwnd, &ps);             }             break;         case wm_destroy:             postquitmessage(0);             break;         default:             return defwindowproc(hwnd, message, wparam, lparam);     }     return 0; }  // message handler box. int_ptr callback about(hwnd hdlg, uint message, wparam wparam, lparam lparam) {     unreferenced_parameter(lparam);     switch (message)     {     case wm_initdialog:         return (int_ptr)true;      case wm_command:         if (loword(wparam) == idok || loword(wparam) == idcancel)         {             enddialog(hdlg, loword(wparam));             return (int_ptr)true;         }         break;     }     return (int_ptr)false; }  void createinventorywindow() {      zeromemory(&wxinv, sizeof(wndclassex));     wxinv.cbclsextra = null;     wxinv.cbsize = sizeof(wndclassex);     wxinv.cbwndextra = null;     wxinv.hbrbackground = (hbrush)color_window;     wxinv.hcursor = loadcursor(null, idc_arrow);     wxinv.hicon = null;     wxinv.hiconsm = null;     wxinv.hinstance = hinst;     wxinv.lpfnwndproc = (wndproc)invwindowprocess;     wxinv.lpszclassname = l"inventory";     wxinv.lpszmenuname = null;     wxinv.style = cs_hredraw | cs_vredraw;     if (!registerclassex(&wxinv))     {         int nresult = getlasterror();         messagebox(null, l"inventory window class registration failed.", l"904.vehiclemanager", mb_iconexclamation);         return;     }      handleforinvwin = createwindowex(null, wxinv.lpszclassname, l"open window 2", ws_overlappedwindow,         200, 170, 640, 480, null, null, hinst, null);      if (!handleforinvwin)     {         messagebox(null, l"error inventory window handle.", l"904.vehmanager", mb_iconexclamation);         return;     }     showwindow(handleforinvwin, sw_shownoactivate);     updatewindow(handleforinvwin); } lresult callback invwindowprocess(hwnd hwnd, uint message, wparam wparam, lparam lparam)  {      hfont hfdefault;     switch (message)     {     case wm_create:     {         hwnd hinvbtn = createwindowex(null, l"button", l"close", ws_tabstop | ws_visible | ws_child | bs_defpushbutton,             50, 220, 100, 24, hwnd, (hmenu)invbtn, getmodulehandle(null), null);         if (hinvbtn == null)             messageboxa(hwnd, "could not create inventory button", "904.vehclemanager", null);         hfdefault = (hfont)getstockobject(default_gui_font);         sendmessage(hinvbtn, wm_setfont, (wparam)hfdefault, makelparam(false, 0));         break;     }     case wm_destroy:     {          break;     }     case wm_command:         case invbtn:         {              destroywindow(hwnd);              break;         }          break;     }     return defwindowproc(hwnd, message, wparam, lparam);  }


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