作业要求在窗口中分两列显示进程，我额外增加了 定时更新进程列表，垂直滚动条，鼠标滚轮。。。
代码：
Hello.h
1
//***************************************************************************************
2//***************************************************************************************
3
4// Prototype for Window Function
5LRESULT CALLBACK MainWndProc(HWND,UINT,WPARAM,LPARAM);
6
7// Prototypes of functions called by WinMain
8BOOL InitApplication(HINSTANCE);
9BOOL InitInstance(HINSTANCE,int);
10
11//***************************************************************************************
12//***************************************************************************************
13
Hello.cpp
1#include <windows.h>
2#include "hello.h" // 自定义头文件
3#include <tlhelp32.h>
4
5//***************************************************************************************
6
7int WINAPI WinMain(HINSTANCE hInstance, // 入口函数
8 HINSTANCE,
9 LPSTR lpCmdLine,
10 int nCmdShow )
11
{
12
if (!InitApplication(hInstance)) // 应用初始化
13 return FALSE;
14
15 if (!InitInstance(hInstance,nCmdShow)) // 实例初始化
16 return FALSE;
17
18 MSG msg;
19 while (GetMessage(&msg, NULL, 0, 0)) // 消息循环
20
{
21 TranslateMessage(&msg);
22 DispatchMessage(&msg);
23
}
24
25 return (int)msg.wParam;
26
}
27
28//***************************************************************************************
29
30BOOL InitApplication(HINSTANCE hInstance) // 应用初始化
31{
32 WNDCLASS wc; // Data structure of the window class
33
34 wc.style = CS_HREDRAW | CS_VREDRAW;
35 wc.lpfnWndProc = (WNDPROC)MainWndProc; // Name of the Window Function
36 wc.cbClsExtra = 0;
37 wc.cbWndExtra = 0;
38 wc.hInstance = hInstance;
39 wc.hIcon = LoadIcon (NULL, IDI_APPLICATION);
40 wc.hCursor = LoadCursor(NULL, IDC_ARROW);
41 wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
42 wc.lpszMenuName = NULL;
43 wc.lpszClassName = TEXT("My1stWClass"); // Name of the window class
44
45 return RegisterClass(&wc);
46}
47
48//***************************************************************************************
49
50BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) // 实例初始化
51{
52 HWND hWnd = CreateWindow(TEXT("My1stWClass"), // Name of the window class
53 TEXT("My First Window"), // Title of the window
54 WS_OVERLAPPEDWINDOW | WS_VSCROLL,
55 CW_USEDEFAULT,
56 CW_USEDEFAULT,
57 CW_USEDEFAULT,
58 CW_USEDEFAULT,
59 NULL,
60 NULL,
61 hInstance,
62 NULL );
63 if (!hWnd) return FALSE;
64
65 ShowWindow(hWnd, nCmdShow);
66 UpdateWindow(hWnd);
67
68 return TRUE;
69}
70
71//***************************************************************************************
72
73// 窗口过程函数
74
75#define PROCESS_MAX 512
76#define PROCESS_NAME_MAX 256
77
78LRESULT CALLBACK MainWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
79{
80 static int cyChar, cyClient, iVscrollPos, iVscrollMax;
81
82 static int iProcessNum;
83 static TCHAR szProcessName[ PROCESS_MAX ][ PROCESS_NAME_MAX ];
84 static DWORD dwProcessId[ PROCESS_MAX ];
85
86 switch (message) {
87
88 case WM_CREATE :
89 {
90 TEXTMETRIC tm;
91 HDC hdc;
92
93 ::SetTimer( hWnd, 0, 1000, NULL );
94
95 hdc = ::GetDC( hWnd );
96 ::GetTextMetrics( hdc, &tm );
97 cyChar = tm.tmHeight + tm.tmExternalLeading;
98 ::ReleaseDC( hWnd, hdc );
99
100 ::SendMessage( hWnd, WM_TIMER, 0, 0 );
101 }
102 return 0;
103
104 case WM_SIZE :
105 cyClient = HIWORD( lParam );
106 return 0;
107
108 case WM_TIMER :
109 {
110 PROCESSENTRY32 pe32;
111 HANDLE hProcessSnap;
112 BOOL bMore;
113
114 pe32.dwSize = sizeof(pe32);
115 hProcessSnap = ::CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
116 bMore = ::Process32First(hProcessSnap, &pe32);
117 iProcessNum = 0;
118 while ( bMore ) {
119 ::lstrcpy( szProcessName[ iProcessNum ], pe32.szExeFile );
120 dwProcessId[ iProcessNum++ ] = pe32.th32ProcessID;
121 bMore = ::Process32Next(hProcessSnap, &pe32);
122 }
123 ::CloseHandle(hProcessSnap);
124 iVscrollMax = ( iProcessNum + 1 ) / 2 * 3 - 1;
125 if ( iVscrollPos > iVscrollMax ) {
126 iVscrollPos = iVscrollMax;
127 }
128 ::SetScrollRange( hWnd, SB_VERT, 0, iVscrollMax, FALSE );
129 ::SetScrollPos( hWnd, SB_VERT, iVscrollPos, TRUE );
130 ::InvalidateRect( hWnd, NULL, TRUE );
131 }
132 return 0;
133
134 case WM_MOUSEWHEEL :
135 {
136 short delta = HIWORD( wParam );
137 if ( delta < 0 ) {
138 ::SendMessage( hWnd, WM_VSCROLL, SB_LINEDOWN, 0 );
139 }
140 if ( delta > 0 ) {
141 ::SendMessage( hWnd, WM_VSCROLL, SB_LINEUP, 0 );
142 }
143 }
144 return 0;
145
146 case WM_VSCROLL :
147 switch ( LOWORD( wParam ) ) {
148 case SB_LINEUP :
149 --iVscrollPos;
150 break;
151 case SB_LINEDOWN :
152 ++iVscrollPos;
153 break;
154 case SB_PAGEUP :
155 iVscrollPos -= cyClient / cyChar;
156 break;
157 case SB_PAGEDOWN :
158 iVscrollPos += cyClient / cyChar;
159 break;
160 case SB_THUMBPOSITION :
161 iVscrollPos = HIWORD( wParam );
162 break;
163 default :
164 break;
165 }
166 if ( iVscrollPos > iVscrollMax ) {
167 iVscrollPos = iVscrollMax;
168 }
169 if ( iVscrollPos < 0 ) {
170 iVscrollPos = 0;
171 }
172 if ( iVscrollPos != ::GetScrollPos( hWnd, SB_VERT ) ) {
173 ::SetScrollPos( hWnd, SB_VERT, iVscrollPos, TRUE );
174 ::InvalidateRect( hWnd, NULL, TRUE );
175 }
176 return 0;
177
178 case WM_PAINT:
179 {
180 PAINTSTRUCT ps;
181 HDC hdc;
182 TCHAR str[ PROCESS_NAME_MAX + 100 ];
183 int i, x, y, lef = 0;
184
185 hdc = ::BeginPaint( hWnd, &ps );
186
187 for ( i = 0; i < iProcessNum; ++i ) {
188 x = lef * 300;
189 y = ( ( (i+1+1) / 2 * 3 - 3 ) - iVscrollPos ) * cyChar;
190 lef ^= 1;
191
192 ::wsprintf( str, TEXT(" 进程名称：%s "), szProcessName[ i ] );
193 ::TextOut( hdc, x, y, str, lstrlen(str) );
194 y += cyChar;
195 ::wsprintf( str, TEXT(" 进程ID号：%u "), dwProcessId[ i ] );
196 ::TextOut( hdc, x, y, str, lstrlen(str) );
197 }
198
199 ::EndPaint( hWnd, &ps );
200 }
201 return 0;
202
203 case WM_DESTROY: // 窗口关闭
204 ::KillTimer( hWnd, 0 );
205 PostQuitMessage(0);
206 return 0;
207
208 default: // 缺省消息的处理
209 return DefWindowProc(hWnd, message, wParam, lParam);
210 }
211}
212