WinMain 函数笔记

 1 #include <windows.h>
 2 
 3 LRESULT CALLBACK WindowProc(
 4     _In_ HWND hwnd,
 5     _In_ UINT uMsg,
 6     _In_ WPARAM wParam,
 7     _In_ LPARAM lParam
 8 );
 9 
10 int CALLBACK WinMain(
11     _In_ HINSTANCE hInstance,
12     _In_ HINSTANCE hPrevInstance,
13     _In_ LPSTR,
14     _In_ int nCmdShow
15 )
16 {
17     WCHAR * cls_Name = TEXT("My Class");
18 
19     WNDCLASS wc = {};
20     wc.hbrBackground = (HBRUSH)COLOR_WINDOW;
21     wc.lpfnWndProc = WindowProc;
22     wc.lpszClassName = cls_Name;
23     wc.hInstance = hInstance;
24 
25     RegisterClass(&wc);
26 
27     HWND hwnd = CreateWindow(
28         cls_Name,            //类名，要和刚才注册的一致  
29         L"我的应用程序",       //窗口标题文字  
30         WS_OVERLAPPEDWINDOW, //窗口外观样式  
31         38,                  //窗口相对于父级的X坐标  
32         20,                  //窗口相对于父级的Y坐标  
33         480,                 //窗口的宽度  
34         250,                 //窗口的高度  
35         NULL,                //没有父窗口，为NULL  
36         NULL,                //没有菜单，为NULL  
37         hInstance,           //当前应用程序的实例句柄  
38         NULL);               //没有附加数据，为NULL  
39     if (hwnd == NULL)
40     {
41         return 0;
42     }
43 
44     ShowWindow(hwnd, SW_SHOW);
45 
46     UpdateWindow(hwnd);
47 
48 
49     MSG msg;
50     while (GetMessage(&msg, NULL, 0, 0))
51     {
52         TranslateMessage(&msg);
53         DispatchMessage(&msg);
54     }
55     return 0;
56 }
57 
58 
59 LRESULT CALLBACK WindowProc(
60     _In_ HWND hwnd,
61     _In_ UINT uMsg,
62     _In_ WPARAM wParam,
63     _In_ LPARAM lParam
64 )
65 {
66     switch (uMsg)
67     {
68     case WM_DESTROY:
69         {
70             PostQuitMessage(0);
71             return 0;
72         }
73     default:
74         break;
75     }
76     return DefWindowProc(hwnd, uMsg, wParam, lParam);
77 }
78 
79 /* typedef struct tagWNDCLASS {
80     UINT style;
81     WNDPROC lpfnWndProc;
82     int cbClsExtra;
83     int cbWndExtra;
84     HINSTANCE hInstance;
85     HICON hIcon;
86     HCURSOR hCursor;
87     HBRUSH hbrBackground;
88     LPCTSTR lpszMenuName;
89     LPCTSTR lpszClassName;
90 } WNDCLASS, *PWNDCLASS; */