windows程序设计例题解析 SYSMETS4.C

最新推荐文章于 2018-07-11 12:37:00 发布

从未止步的浪

最新推荐文章于 2018-07-11 12:37:00 发布

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分类专栏： windows程序设计

本文链接：https://blog.youkuaiyun.com/zhongguo_fj/article/details/8249307

SYSMETS4.C是一个显示系统度量的Windows程序，包含处理窗口创建、消息处理、垂直和水平滚动条管理、键盘输入响应。程序通过WM_CREATE、WM_SIZE、WM_VSCROLL、WM_HSCROLL、WM_KEYDOWN等消息来响应用户操作，例如键盘快捷键对应滚动条的操作。文章鼓励读者尝试添加鼠标点击和菜单事件来扩展程序功能。

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/*----------------------------------------------------
SYSMETS4.C -- System Metrics Display Program No. 4
(c) Charles Petzold, 1998
----------------------------------------------------*/

#define WINVER 0x0500
#include <windows.h>
#include "sysmets.h"

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     static TCHAR szAppName[] = TEXT ("SysMets4") ;
     HWND         hwnd ;
     MSG          msg ;
     WNDCLASS     wndclass ;

     wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
     wndclass.lpfnWndProc   = WndProc ;
     wndclass.cbClsExtra    = 0 ;
     wndclass.cbWndExtra    = 0 ;
     wndclass.hInstance     = hInstance ;
     wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;
     wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
     wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
     wndclass.lpszMenuName = NULL ;
     wndclass.lpszClassName = szAppName ;

     if (!RegisterClass (&wndclass))
     {
          MessageBox (NULL, TEXT ("Program requires Windows NT!"),
                      szAppName, MB_ICONERROR) ;
          return 0 ;
     }

     hwnd = CreateWindow (szAppName, TEXT ("Get System Metrics No. 4"),
                          WS_OVERLAPPEDWINDOW | WS_VSCROLL | WS_HSCROLL,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          NULL, NULL, hInstance, NULL) ;

     ShowWindow (hwnd, iCmdShow) ;
     UpdateWindow (hwnd) ;

     while (GetMessage (&msg, NULL, 0, 0))
     {
          TranslateMessage (&msg) ;
          DispatchMessage (&msg) ;
     }
     return msg.wParam ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
     static int cxChar, cxCaps, cyChar, cxClient, cyClient, iMaxWidth ;
     HDC         hdc ;
     int         i, x, y, iVertPos, iHorzPos, iPaintBeg, iPaintEnd ;
     PAINTSTRUCT ps ;
     SCROLLINFO si ;
     TCHAR       szBuffer[10] ;
     TEXTMETRIC tm ;

     switch (message)
     {
     case WM_CREATE:

//获取字体信息
hdc = GetDC (hwnd) ;

&nbs