新建文本文档 (2).txt

Visual C++ 面向对象与可视化程序设计习题解析与编程实例 p83页 3题答案

#include<windows.h>
#include<stdlib.h>
#include<stdio.h>
#include<string.h>

LRESULT CALLBACK WndProc(HWND hwnd,UINT iMessage,UINT wParam,LONG lParam);

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPreInstance,LPSTR lpCmdLine,int nShowCmd)
{
 MSG msg;
 HWND hwnd;
 WNDCLASS wndclass;

 wndclass.cbClsExtra=0;
    wndclass.cbWndExtra=0;
 wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
 wndclass.hCursor=LoadCursor(hInstance,IDC_ARROW);
 wndclass.hIcon=LoadIcon(hInstance,"END");
 wndclass.hInstance=hInstance;
 wndclass.lpfnWndProc=WndProc;
 wndclass.lpszClassName="键盘响应1";
 wndclass.lpszMenuName=NULL;
 wndclass.style=CS_HREDRAW|CS_VREDRAW;

 if(!RegisterClass(&wndclass))
 {
  MessageBeep(0);
  return 0;
 }

 hwnd=CreateWindow("键盘响应1","键盘响应",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,0,CW_USEDEFAULT,0,NULL,NULL,hInstance,NULL);
 
 ShowWindow(hwnd,nShowCmd);
 UpdateWindow(hwnd);

 while(GetMessage(&msg,hwnd,0,0))
 {
  TranslateMessage(&msg);
  DispatchMessage(&msg);
 }

 return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd,UINT iMessage,UINT wParam,LONG lParam)
{
 HDC hdc;
 PAINTSTRUCT ps;
 HPEN hPen;
 HBRUSH hBrush;

 static char cUp[]="You had hit the UP key";
 static char cCtrl[]="You had hit the Ctrl key";
 static char cShift[]="You had hit the SHIFT key";
 static char cCtrl_A[]="You had hit the CTRL A key";
 static char cShift_B[]="You had hit the SHIFT B key";

 static bool nUpKeyDown=false,
          nShiftKeyDown=false,
    nCtrlKeyDown=false,
    nCtrlAKeyDown=false,
    nShiftBKeyDown=false;

 switch(iMessage)
 {
 case WM_KEYDOWN:
  {
   switch(wParam)
   {
   case VK_UP:
    nUpKeyDown=true;
    break;
   case VK_SHIFT:
    nShiftKeyDown=true;
    break;
   case VK_CONTROL:
    nCtrlKeyDown=true;
   default:
    break;
   }
  }
  break;
 case WM_KEYUP:
  InvalidateRect(hwnd,NULL,false);
  break;
 case WM_CHAR:
  if(wParam==(65&VK_CONTROL))
  {
   if(nCtrlKeyDown==true)
   {
    nCtrlAKeyDown=true;
    nCtrlKeyDown=false;
   }
  }
  else if(wParam==98||wParam==66)
  {
   if(nShiftKeyDown==true)
   {
    nShiftBKeyDown=true;
    nShiftKeyDown=false;
   }
  }
  break;
 case WM_PAINT:
  hdc=BeginPaint(hwnd,&ps);
  hBrush=(HBRUSH)GetStockObject(WHITE_BRUSH);
  hPen=(HPEN)GetStockObject(WHITE_BRUSH);
  SelectObject(hdc,hPen);
  SelectObject(hdc,hBrush);
  SetTextColor(hdc,RGB(255,0,0));
  
  if(nUpKeyDown==true)
  {
   Rectangle(hdc,0,0,300,200);
   TextOut(hdc,0,100,cUp,strlen(cUp));
   nUpKeyDown=false;
  }
  else if(nCtrlAKeyDown==true)
  {
   Rectangle(hdc,0,0,300,200);
   TextOut(hdc,0,100,cCtrl_A,strlen(cCtrl_A));
   nCtrlAKeyDown=false;
   nCtrlKeyDown=false;
  }
  else if(nCtrlKeyDown==true)
  {
   Rectangle(hdc,0,0,300,200);
   TextOut(hdc,0,60,cCtrl,strlen(cCtrl));
   nCtrlKeyDown=false;
  }
  else if(nShiftBKeyDown==true)
  {
   Rectangle(hdc,0,0,300,200);
   TextOut(hdc,0,0,cShift_B,strlen(cShift_B));
   nShiftBKeyDown=false;
   nShiftKeyDown=false;
  }
  else if(nShiftKeyDown==true)
  {
   Rectangle(hdc,0,0,300,200);
   TextOut(hdc,0,0,cShift,strlen(cShift));
   nShiftKeyDown=false;
  }
  else;

  DeleteObject(hPen);
  DeleteObject(hBrush);
  EndPaint(hwnd,&ps);
  
  break;
 case WM_DESTROY:
  PostQuitMessage(0);
  break;

 default:
  return DefWindowProc(hwnd,iMessage,wParam,lParam);
 }
 }