title: C++ Linker Error with DirectX SDK
body: <p>I'm trying, desperately, to get into C++ programming with DirectX. It's been a steep uphill battle, and I've only written a couple of lines of code. Most of my battles have been with the linker. So far, I have this in my header file:</p>
  
  <pre><code>#pragma once
  
  #include "resource.h"
  #include &lt;d3d11.h&gt;
  #include &lt;d3dx11.h&gt;
  #include &lt;d3dx10.h&gt;
  
  #pragma comment (lib, "d3d11.lib")
  #pragma comment (lib, "d3dx11.lib")
  #pragma comment (lib, "d3dx10.lib")
  
  IDXGISwapChain *swapChain;
  ID3D11Device *device;
  ID3D11DeviceContext *deviceContext;
  
  void InitializeDirect3D(HWND hWnd);
  void CleanDirect3D(void);
  </code></pre>
  
  <p>And in the source file:</p>
  
  <pre><code>// InitializingDX.cpp : Defines the entry point for the application.
  //
  
  #include "stdafx.h"
  #include "InitializingDX.h"
  
  #define MAX_LOADSTRING 100
  
  // Global Variables:
  HINSTANCE hInst;                                // current instance
  TCHAR szTitle[MAX_LOADSTRING];                  // The title bar text
  TCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name
  
  // Forward declarations of functions included in this code module:
  ATOM                MyRegisterClass(HINSTANCE hInstance);
  BOOL                InitInstance(HINSTANCE, int);
  LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
  INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);
  
  int APIENTRY _tWinMain(HINSTANCE hInstance,
                       HINSTANCE hPrevInstance,
                       LPTSTR    lpCmdLine,
                       int       nCmdShow)
  {
      UNREFERENCED_PARAMETER(hPrevInstance);
      UNREFERENCED_PARAMETER(lpCmdLine);
  
      // TODO: Place code here.
      MSG msg;
      HACCEL hAccelTable;
  
      // Initialize global strings
      LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
      LoadString(hInstance, IDC_INITIALIZINGDX, szWindowClass, MAX_LOADSTRING);
      MyRegisterClass(hInstance);
  
      // Perform application initialization:
      if (!InitInstance (hInstance, nCmdShow))
      {
          return FALSE;
      }
  
      hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_INITIALIZINGDX));
  
      // Main message loop:
      while (GetMessage(&amp;msg, NULL, 0, 0))
      {
          if (!TranslateAccelerator(msg.hwnd, hAccelTable, &amp;msg))
          {
              TranslateMessage(&amp;msg);
              DispatchMessage(&amp;msg);
          }
      }
  
      return (int) msg.wParam;
  }
  
  
  
  //
  //  FUNCTION: MyRegisterClass()
  //
  //  PURPOSE: Registers the window class.
  //
  //  COMMENTS:
  //
  //    This function and its usage are only necessary if you want this code
  //    to be compatible with Win32 systems prior to the 'RegisterClassEx'
  //    function that was added to Windows 95. It is important to call this function
  //    so that the application will get 'well formed' small icons associated
  //    with it.
  //
  ATOM MyRegisterClass(HINSTANCE hInstance)
  {
      WNDCLASSEX 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_INITIALIZINGDX));
      wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
      wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
      wcex.lpszMenuName   = MAKEINTRESOURCE(IDC_INITIALIZINGDX);
      wcex.lpszClassName  = szWindowClass;
      wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
  
      return RegisterClassEx(&amp;wcex);
  }
  
  //
  //   FUNCTION: InitInstance(HINSTANCE, int)
  //
  //   PURPOSE: Saves instance handle and creates main window
  //
  //   COMMENTS:
  //
  //        In this function, we save the instance handle in a global variable and
  //        create and display the main program window.
  //
  BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
  {
     HWND hWnd;
  
     hInst = hInstance; // Store instance handle in our global variable
  
     hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
  
     if (!hWnd)
     {
        return FALSE;
     }
  
     ShowWindow(hWnd, nCmdShow);
     UpdateWindow(hWnd);
  
     return TRUE;
  }
  
  //
  //  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
  //
  //  PURPOSE:  Processes messages for the main window.
  //
  //  WM_COMMAND  - process the application menu
  //  WM_PAINT    - Paint the main window
  //  WM_DESTROY  - post a quit message and return
  //
  //
  LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
  {
      int wmId, wmEvent;
      PAINTSTRUCT ps;
      HDC hdc;
  
      switch (message)
      {
      case WM_COMMAND:
          wmId    = LOWORD(wParam);
          wmEvent = HIWORD(wParam);
          // Parse the menu selections:
          switch (wmId)
          {
          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_PAINT:
          hdc = BeginPaint(hWnd, &amp;ps);
          // TODO: Add any drawing code here...
          EndPaint(hWnd, &amp;ps);
          break;
      case WM_DESTROY:
          PostQuitMessage(0);
          break;
      default:
          return DefWindowProc(hWnd, message, wParam, lParam);
      }
      return 0;
  }
  
  // Message handler for about 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 InitD3D(HWND hWnd)
  {
      DXGI_SWAP_CHAIN_DESC scd;
  
      ZeroMemory(&amp;scd, sizeof(DXGI_SWAP_CHAIN_DESC));
  
      scd.BufferCount = 1;
      scd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
      scd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
      scd.OutputWindow = hWnd;
      scd.SampleDesc.Count = 4;
      scd.Windowed = true;
  
      D3D11CreateDeviceAndSwapChain(NULL, D3D_DRIVER_TYPE_HARDWARE, NULL, NULL, NULL, NULL, D3D11_SDK_VERSION, &amp;scd, &amp;swapChain, &amp;device, NULL, &amp;deviceContext);
  }
  </code></pre>
  
  <p>It breaks on that last line, saying "error LNK2019: unresolved external symbol <em>D3D11CreateDeviceAndSwapChain@48 references in function void</em>_cdecl InitD3D(struct HWND__*)" (?InitD3D@@YAXPAUHWND__@@@Z)".</p>
  
  <p>I don't know what's wrong here, the #includes work to link the D3D libraries in, and the program builds or executes up until it gets to that line. Any help you guys could give would be appreciated. Thanks!</p>