DirectX学习之第一个可运行的工程

学习一门开发语言的第一件事情当然是搭建一个可运行的环境，然后运行一个可成功执行的案例。

本人在学习DirectX的第一个工程的时候，参考了雨凇MoMo的一篇文章(https://www.xuanyusong.com/archives/802),但是看了之后，还是不知道如何才能运行起来。

然后，又参考了一篇文章(https://blog.****.net/chenwu_843402773/article/details/8077935)。

通过参考第二篇文章中的一些内容，最终把第一篇文章中的案例运行了起来，在此做一下记录，具体原理，相信随着学习 Direct 的逐渐升入，会理解的，现在不做过多说明，哈哈哈哈哈哈。。。

 #include<d3d9.h>

 #define WINDOW_CLASS "UGPDX"                    //宏定义窗口类名称
 #define WINDOW_NAME  "MyFirstDirectProject"     //宏定义窗口名称

 LRESULT WINAPI MsgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
 LPDIRECT3D9            g_pD3D = NULL;
 LPDIRECT3DDEVICE9    g_pDevice = NULL;
 HRESULT InitD3D(HWND hwnd);
 void Cleanup();
 void Render();

 int WINAPI WinMain(HINSTANCE hInst, HINSTANCE prevhInst, LPSTR cmdLine, int show)
 {
     WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L,
         GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
         WINDOW_CLASS, NULL };
     RegisterClassEx(&wc);      

     HWND hWnd = CreateWindow(WINDOW_CLASS, WINDOW_NAME, WS_OVERLAPPEDWINDOW,
         , , , , GetDesktopWindow(), NULL,
         wc.hInstance, NULL);

     if (InitD3D(hWnd) == S_OK)
     {
         ShowWindow(hWnd, SW_SHOWDEFAULT);
         UpdateWindow(hWnd);

         MSG msg;
         ZeroMemory(&msg, sizeof(msg));

         while (msg.message != WM_QUIT)
         {
             if (PeekMessage(&msg, NULL, , , PM_REMOVE))
             {
                 TranslateMessage(&msg);
                 DispatchMessage(&msg);
             }
             else
             {
                 Render();
             }
         }
     }

     UnregisterClass(WINDOW_CLASS, wc.hInstance);

     return ;
 }
 LRESULT WINAPI MsgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
     switch (msg)
     {
     case WM_DESTROY:
         PostQuitMessage();
         return ;
         break;

     case WM_KEYUP:
         if (wParam == VK_ESCAPE) PostQuitMessage();
         break;
     }

     return DefWindowProc(hWnd, msg, wParam, lParam);
 }

 HRESULT InitD3D(HWND hwnd)
 {
     if (NULL == (g_pD3D = Direct3DCreate9(D3D_SDK_VERSION)))
     {
         return E_FAIL;
     }

     D3DPRESENT_PARAMETERS d3dpparams;
     ZeroMemory(&d3dpparams, sizeof(d3dpparams));
     d3dpparams.Windowed = true;
     d3dpparams.SwapEffect = D3DSWAPEFFECT_DISCARD;
     d3dpparams.BackBufferFormat = D3DFMT_UNKNOWN;

     if (FAILED(g_pD3D->CreateDevice(D3DADAPTER_DEFAULT,
         D3DDEVTYPE_HAL,
         hwnd,
         D3DCREATE_SOFTWARE_VERTEXPROCESSING,
         &d3dpparams,
         &g_pDevice)))
     {
         return E_FAIL;
     }

     return S_OK;
 }

 void Cleanup()
 {
     if (NULL != g_pDevice)
     {
         g_pDevice->Release();
     }
     if (NULL != g_pD3D)
     {
         g_pD3D->Release();
     }
 }

 void Render()
 {
     if (NULL == g_pDevice)
     {
         return;
     }

     g_pDevice->Clear(, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(, , ), 1.0f, );

     if (SUCCEEDED(g_pDevice->BeginScene()))
     {
         g_pDevice->EndScene();
     }

     g_pDevice->Present(NULL, NULL, NULL, NULL);
 }

运行结果: