We help IT Professionals succeed at work.
Get Started

Create Window failure

calsoftware
calsoftware asked
on
589 Views
Last Modified: 2013-12-14

static wchar_t g_szClassName[] = L"MyTestApp";
static HINSTANCE g_hInst = NULL;

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
  LPSTR lpCmdLine, int nCmdShow)
{
  WNDCLASSEX WndClass;
  HWND hwnd;
  MSG Msg;

  g_hInst = hInstance;

  WndClass.cbSize        = sizeof(WNDCLASSEX);
  WndClass.style         = NULL;
  WndClass.lpfnWndProc   = WndProc;
  WndClass.cbClsExtra    = 0;
  WndClass.cbWndExtra    = 0;
  WndClass.hInstance     = g_hInst;
  WndClass.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
  WndClass.hCursor       = LoadCursor(NULL, IDC_ARROW);
  WndClass.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
  WndClass.lpszMenuName  = NULL;
  WndClass.lpszClassName = g_szClassName;
  WndClass.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);

  if(!RegisterClassEx(&WndClass))
  {
     MessageBox(0, L"Window Registration Failed!", "Error!",
        MB_ICONEXCLAMATION | MB_OK | MB_SYSTEMMODAL);
     return 0;
  }

  hwnd = CreateWindowEx(
     WS_EX_CLIENTEDGE,
     g_szClassName,
     L"",
     WS_OVERLAPPEDWINDOW & ~WS_BORDER,
     CW_USEDEFAULT, CW_USEDEFAULT, 320, 240,
     NULL, NULL, GetModuleHandle(NULL), NULL);

  DWORD x = GetLastError();

  if(hwnd == NULL)
  {
     MessageBox(0, L"Window Creation Failed!", L"Error!",
        MB_ICONEXCLAMATION | MB_OK | MB_SYSTEMMODAL);
     return 0;
  }

  ShowWindow(hwnd, SW_HIDE);
  UpdateWindow(hwnd);


  while(GetMessage(&Msg, NULL, 0, 0))
  {
     TranslateMessage(&Msg);
     DispatchMessage(&Msg);
  }
  return Msg.wParam;
}

In the above code snippet the hwnd is always NULL, Any ideas

Thanks all
Comment
Watch Question
Commented:
This problem has been solved!
Unlock 1 Answer and 9 Comments.
See Answer
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE