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.csdn.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。。。

1 #include
     
        2   3 #define WINDOW_CLASS "UGPDX"                    //宏定义窗口类名称  4 #define WINDOW_NAME  "MyFirstDirectProject"     //宏定义窗口名称  5   6 LRESULT WINAPI MsgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);  7 LPDIRECT3D9            g_pD3D = NULL;           8 LPDIRECT3DDEVICE9    g_pDevice = NULL;       9 HRESULT InitD3D(HWND hwnd); 10 void Cleanup(); 11 void Render(); 12  13 int WINAPI WinMain(HINSTANCE hInst, HINSTANCE prevhInst, LPSTR cmdLine, int show) 14 { 15     WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L, 16         GetModuleHandle(NULL), NULL, NULL, NULL, NULL, 17         WINDOW_CLASS, NULL }; 18     RegisterClassEx(&wc);       19  20     HWND hWnd = CreateWindow(WINDOW_CLASS, WINDOW_NAME, WS_OVERLAPPEDWINDOW, 21         100, 100, 640, 480, GetDesktopWindow(), NULL, 22         wc.hInstance, NULL); 23  24  25     if (InitD3D(hWnd) == S_OK) 26     { 27         ShowWindow(hWnd, SW_SHOWDEFAULT); 28         UpdateWindow(hWnd); 29  30         MSG msg; 31         ZeroMemory(&msg, sizeof(msg)); 32  33         while (msg.message != WM_QUIT) 34         { 35             if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) 36             { 37                 TranslateMessage(&msg); 38                 DispatchMessage(&msg); 39             } 40             else 41             { 42                 Render(); 43             } 44         } 45     } 46  47     UnregisterClass(WINDOW_CLASS, wc.hInstance); 48  49     return 0; 50 } 51 LRESULT WINAPI MsgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) 52 { 53     switch (msg) 54     { 55     case WM_DESTROY: 56         PostQuitMessage(0); 57         return 0; 58         break; 59  60     case WM_KEYUP: 61         if (wParam == VK_ESCAPE) PostQuitMessage(0); 62         break; 63     } 64  65     return DefWindowProc(hWnd, msg, wParam, lParam); 66 } 67  68 HRESULT InitD3D(HWND hwnd) 69 { 70     if (NULL == (g_pD3D = Direct3DCreate9(D3D_SDK_VERSION))) 71     { 72         return E_FAIL; 73     } 74  75     D3DPRESENT_PARAMETERS d3dpparams; 76     ZeroMemory(&d3dpparams, sizeof(d3dpparams)); 77     d3dpparams.Windowed = true; 78     d3dpparams.SwapEffect = D3DSWAPEFFECT_DISCARD; 79     d3dpparams.BackBufferFormat = D3DFMT_UNKNOWN; 80  81     if (FAILED(g_pD3D->CreateDevice(D3DADAPTER_DEFAULT, 82         D3DDEVTYPE_HAL, 83         hwnd, 84         D3DCREATE_SOFTWARE_VERTEXPROCESSING, 85         &d3dpparams, 86         &g_pDevice))) 87     { 88         return E_FAIL; 89     } 90  91     return S_OK; 92 } 93  94 void Cleanup() 95 { 96     if (NULL != g_pDevice) 97     { 98         g_pDevice->Release(); 99     }100     if (NULL != g_pD3D)101     {102         g_pD3D->Release();103     }104 }105 106 107 void Render()108 {109     if (NULL == g_pDevice)110     {111         return;112     }113 114     g_pDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(30, 60, 90), 1.0f, 0);115 116     if (SUCCEEDED(g_pDevice->BeginScene()))117     {118         g_pDevice->EndScene();119     }120 121     g_pDevice->Present(NULL, NULL, NULL, NULL);122 }
     

运行结果: