Windows 학습 노트--SYSMETS2

SYSMETS1 프로그램의 토대 위에서 창에 가장 중요한 요소 중 하나인 스크롤 바를 추가합니다.
코드 설명은 다음과 같습니다.

  
  
  
  

   
   
   
   
//SYSMETS2.cpp  
   
   
   
   
#include<windows.h>  
   
   
   
   
#include"sysmets.h"  
   
   
   
   
 
   
   
   
   
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);  
   
   
   
   
 
   
   
   
   
 
   
   
   
   
int APIENTRY WinMain(HINSTANCE hInstance,  
   
   
   
   
                     HINSTANCE hPrevInstance,  
   
   
   
   
                     PSTR     szCmdLine,  
   
   
   
   
                     int       iCmdShow)  
   
   
   
   
{  
   
   
   
   
    static TCHAR szAppName[]=TEXT("SysMets2");  
   
   
   
   
    HWND hWnd;  
   
   
   
   
    MSG msg;  
   
   
   
   
    WNDCLASS wndclass;  
   
   
   
   
 
   
   
   
   
    //      10     
   
   
   
   
    wndclass.cbClsExtra=0;  
   
   
   
   
    wndclass.cbWndExtra=0;  
   
   
   
   
 
   
   
   
   
    wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);  
   
   
   
   
 
   
   
   
   
    wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);  
   
   
   
   
    wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);  
   
   
   
   
 
   
   
   
   
    wndclass.hInstance=hInstance;  
   
   
   
   
 
   
   
   
   
    wndclass.lpfnWndProc=WndProc;                                 //          
   
   
   
   
    wndclass.lpszClassName=szAppName;                             //      
   
   
   
   
 
   
   
   
   
    wndclass.lpszMenuName=NULL;  
   
   
   
   
 
   
   
   
   
    wndclass.style=CS_HREDRAW|CS_VREDRAW;  
   
   
   
   
 
   
   
   
   
    //       
   
   
   
   
    int retVal=RegisterClass(&wndclass); //  ，  0；  ，   0  
   
   
   
   
    if(retVal == 0)  
   
   
   
   
    {  
   
   
   
   
        MessageBox(NULL,TEXT("This progrom requires Windows NT !"),szAppName,MB_ICONERROR);  
   
   
   
   
        return 0;  
   
   
   
   
    }  
   
   
   
   
 
   
   
   
   
    //      
   
   
   
   
    hWnd=CreateWindow(szAppName,  
   
   
   
   
                      TEXT("Get System Metrics No.2"),  
   
   
   
   
                      WS_OVERLAPPEDWINDOW | WS_VSCROLL,  
   
   
   
   
                      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,cyClient,iVscrollPos;  
   
   
   
   
    HDC hdc;  
   
   
   
   
    int i;  
   
   
   
   
    PAINTSTRUCT ps;  
   
   
   
   
    TCHAR szBuffer[10];  
   
   
   
   
    TEXTMETRIC tm;  
   
   
   
   
 
   
   
   
   
    //      
   
   
   
   
    switch(message){  
   
   
   
   
      
   
   
   
   
    case WM_CREATE: //CreateWindows   ，     (    API     ，       )  
   
   
   
   
        hdc=GetDC(hWnd);  
   
   
   
   
 
   
   
   
   
        GetTextMetrics(hdc,&tm);  
   
   
   
   
        cxChar=tm.tmAveCharWidth;  
   
   
   
   
        cxCaps=(tm.tmPitchAndFamily & 1? 3:2)* cxChar/2;  
   
   
   
   
        cyChar=tm.tmHeight+tm.tmExternalLeading;  
   
   
   
   
 
   
   
   
   
        ReleaseDC(hWnd,hdc);  
   
   
   
   
 
   
   
   
   
        //                
   
   
   
   
        SetScrollRange(hWnd,SB_VERT,0,NUMLINES-1,FALSE);  
   
   
   
   
        SetScrollPos(hWnd,SB_VERT,iVscrollPos,TRUE);  
   
   
   
   
        return 0;  
   
   
   
   
 
   
   
   
   
    case WM_SIZE: //(        ，     ；     WM_PAINT  )  
   
   
   
   
        cyClient=HIWORD(lParam); //lParam：   ，        ；   ，   .  
   
   
   
   
        return 0;  
   
   
   
   
 
   
   
   
   
    case WM_VSCROLL:  
   
   
   
   
        switch(LOWORD(wParam)) //wParam：   ，              
   
   
   
   
        {  
   
   
   
   
        case SB_LINEUP:  
   
   
   
   
            iVscrollPos-=1;  
   
   
   
   
            break;  
   
   
   
   
        case SB_LINEDOWN:  
   
   
   
   
            iVscrollPos+=1;  
   
   
   
   
            break;  
   
   
   
   
        case SB_PAGEUP:  
   
   
   
   
            iVscrollPos-=cyClient/cyChar;  
   
   
   
   
            break;  
   
   
   
   
        case SB_PAGEDOWN:  
   
   
   
   
            iVscrollPos+=cyClient/cyChar;  
   
   
   
   
            break;  
   
   
   
   
 
   
   
   
   
        case SB_THUMBPOSITION:  
   
   
   
   
            iVscrollPos=HIWORD(wParam); //   ，    (    )       
   
   
   
   
            break;  
   
   
   
   
        default:  
   
   
   
   
            break;  
   
   
   
   
        }  
   
   
   
   
 
   
   
   
   
        //        ，   iVscrollPos  
   
   
   
   
        iVscrollPos=max(0,min(iVscrollPos,NUMLINES-1));  
   
   
   
   
        if(GetScrollPos(hWnd,SB_VERT) != iVscrollPos)  
   
   
   
   
        {  
   
   
   
   
            SetScrollPos(hWnd,SB_VERT,iVscrollPos,TRUE);  
   
   
   
   
            InvalidateRect(hWnd,NULL,TRUE);  
   
   
   
   
        }  
   
   
   
   
        return 0;  
   
   
   
   
 
   
   
   
   
 
   
   
   
   
    case WM_PAINT:  
   
   
   
   
        hdc=BeginPaint(hWnd,&ps);  
   
   
   
   
          
   
   
   
   
          
   
   
   
   
        for(i=0;i<NUMLINES;i++)  
   
   
   
   
        {  
   
   
   
   
            TextOut(hdc,0,cyChar*(i-iVscrollPos),sysmetrics[i].szLabel,lstrlen(sysmetrics[i].szLabel));  
   
   
   
   
            TextOut(hdc,22*cxCaps,cyChar*(i-iVscrollPos),sysmetrics[i].szDesc,lstrlen(sysmetrics[i].szDesc));  
   
   
   
   
 
   
   
   
   
            SetTextAlign(hdc,TA_LEFT|TA_TOP);  
   
   
   
   
            TextOut(hdc,  
   
   
   
   
                    22*cxCaps+40*cxChar,cyChar*(i-iVscrollPos),  
   
   
   
   
                    szBuffer,wsprintf(szBuffer,TEXT("%5d"),GetSystemMetrics(sysmetrics[i].iIndex)));  
   
   
   
   
            SetTextAlign(hdc,TA_LEFT|TA_TOP);  
   
   
   
   
        }  
   
   
   
   
 
   
   
   
   
        EndPaint(hWnd,&ps);  
   
   
   
   
        return 0;  
   
   
   
   
 
   
   
   
   
    case WM_DESTROY:  
   
   
   
   
        PostQuitMessage(0);  
   
   
   
   
        return 0;  
   
   
   
   
    }  
   
   
   
   
 
   
   
   
   
    return DefWindowProc(hWnd,message,wParam,lParam);  
   
   
   
   
}  
  
  
  
  

 
 
함수 프로토타입:
1.

ATOM RegisterClass(
  const WNDCLASS* lpWndClass
); 

typedef  WORD                ATOM;
typedef  unsigned short      WORD;
2.

BOOL InvalidateRect( 
  HWND hWnd, 
  const RECT* lpRect, 
  BOOL bErase
); 

const RECT* lpRect,//는 NULL이며, 전체 클라이언트 영역이 업데이트 영역임을 나타냅니다.
BOOL bErase//TRUE인 경우 배경색을 지웁니다.그렇지 않으면 지우지 않습니다.
3.

BOOL SetScrollRange( 
  HWND hWnd, 
  int nBar, 
  int nMinPos, 
  int nMaxPos, 
  BOOL bRedraw 
); 

int nBar, //SB_VERT | SB_HORZ BOOL bRedraw//일반적으로 스크롤 막대의 범위는 다시 그릴 필요가 없습니다.

int SetScrollPos( 
  HWND hWnd, 
  int nBar, 
  int nPos, 
  BOOL bRedraw 
); 

업데이트할 때마다 BOOL bRedraw//슬라이더의 위치를 다시 그려야 합니다.