情报检索系统的基本功能
\u536b\u751f\u4fe1\u606f\u57fa\u672c\u529f\u80fd\u662f\u4ec0\u4e48\u536b\u751f\u4fe1\u606f\u5e73\u53f0\uff0c\u662f\u8fde\u63a5\u533a\u57df\u5185\u7684\u533b\u7597\u536b\u751f\u673a\u6784\u57fa\u672c\u4e1a\u52a1\u4fe1\u606f\u7cfb\u7edf\u7684\u6570\u636e\u4ea4\u6362\u548c\u5171\u4eab\u5e73\u53f0\uff0c\u662f\u4e0d\u540c\u7cfb\u7edf\u95f4\u8fdb\u884c\u4fe1\u606f\u6574\u5408\u7684\u57fa\u7840\u548c\u8f7d\u4f53\u3002\u4ece\u4e1a\u52a1\u89d2\u5ea6\u770b\uff0c\u5e73\u53f0\u53ef\u652f\u6491\u591a\u79cd\u4e1a\u52a1\uff0c\u800c\u975e\u4ec5\u670d\u52a1\u4e8e\u7279\u5b9a\u5e94\u7528\u5c42\u9762\u3002
\uff0c\u4f7f\u7528SDK\u83b7\u53d6DC\u53e5\u67c4\uff1a
HDC hdc;
hdc=::GetDc(m_hWnd);//\u83b7\u53d6DC\u53e5\u67c4
MoveToEx(hdc,m_ptOrigin.x,m_ptOrigin.y,NULL);
LineTo(hdc,point.x,point.y);
::ReleaseDC(m_hWnd,hdc);//\u91ca\u653eDC
2\uff0c\u5229\u7528CDC\u7c7b\u6307\u9488\u548cCWin\u7c7b\u6210\u5458\u51fd\u6570\u83b7\u53d6DC\u3002
CDC *pDC=GetDC();
pDC->MoveTo(m_ptOrigin);
pDC->LineTo(point);
ReleaseDC(pDC);
3\uff0c\u5229\u7528CClientDC\u5bf9\u8c61\u3002\uff08CClientDC\u7c7b\u4eceCDC\u7c7b\u6d3e\u751f\u6765\u7684\uff09
CClientDC dc(this);
dc.MoveTo(m_ptOrigin);
dc.LineTo(point);
\u8bf4\u660e\uff1a
The CClientDC class is derived from CDC and takes care of calling the Windows functions GetDC at construction time and ReleaseDC at destruction time. This means that the device context associated with a CClientDC object is the client area of a window.
4\uff0c\u5229\u7528CWindowDC\u5bf9\u8c61\u3002\uff08CWindowDC\u7c7b\u4eceCDC\u7c7b\u6d3e\u751f\u6765\u7684\uff09
CWindowDC dc(this);//
dc.MoveTo(m_ptOrigin);
dc.LineTo(point);
\u8bf4\u660e\uff1a
The CWindowDC class is derived from CDC. It calls the Windows functionsGetWindowDC at construction time andReleaseDC at destruction time. This means that a CWindowDC object accesses the entire screen area of a CWnd (both client and nonclient areas).
5\uff0cGetParent()\u5f97\u5230\u7236\u7a97\u53e3\u6307\u9488\uff1bGetDesktopWindow()\u5f97\u5230\u5c4f\u5e55\u7a97\u53e3\u6307\u9488\u3002
6\uff0c\u5229\u7528\u753b\u7b14\u6539\u53d8\u7ebf\u6761\u989c\u8272\u548c\u7c7b\u578b\uff1a
CPen pen(PS_DOT,1,RGB(0,255,0));//\u6784\u9020\u753b\u7b14\u5bf9\u8c61
CClientDC dc(this);CPen *pOldPen=dc.SelectObject(&pen);//\u5c06\u753b\u7b14\u9009\u5165DC
dc.MoveTo(m_ptOrigin);
dc.LineTo(point);
dc.SelectObject(pOldPen);//\u6062\u590d\u5148\u524d\u7684\u753b\u7b14
7\uff0c\u4f7f\u7528\u753b\u5237\uff08\u901a\u5e38\u5229\u7528\u753b\u5237\u53bb\u586b\u5145\u77e9\u5f62\u533a\u57df\uff09\uff1a
\u4f7f\u7528\u5355\u8272\u753b\u5237
CBrush brush(RGB(255,0,0));//\u6784\u9020\u753b\u5237\u5bf9\u8c61
CClientDC dc(this);
dc.FillRect(CRect(m_ptOrigin,point),&brush);//\u7528\u6307\u5b9a\u7684\u753b\u5237\u53bb\u586b\u5145\u77e9\u5f62\u533a\u57df
\u4f7f\u7528\u4f4d\u56fe\u753b\u5237
CBitmap bitmap;//\u6784\u9020\u4f4d\u56fe\u5bf9\u8c61\uff08\u4f7f\u7528\u524d\u9700\u8981\u521d\u8bd5\u5316\uff09
bitmap.LoadBitmap(IDB_BITMAP1);//\u521d\u8bd5\u5316\u4f4d\u56fe\u5bf9\u8c61
CBrush brush(&bitmap);//\u6784\u9020\u4f4d\u56fe\u753b\u5237
CClientDC dc(this);
dc.FillRect(CRect(m_ptOrigin,point),&brush);//\u7528\u6307\u5b9a\u7684\u4f4d\u56fe\u753b\u5237\u53bb\u586b\u5145\u77e9\u5f62\u533a\u57df
\u4f7f\u7528\u900f\u660e\u753b\u5237
CBrush *pBrush=CBrush::FromHandle((HBRUSH)GetStockObject(NULL_BRUSH));//\u83b7\u53d6\u900f\u660e\u753b\u5237\u5bf9\u8c61\u6307\u9488
CClientDC dc(this);
CBrush *pOldBrush=dc.SelectObject(pBrush);//\u5c06\u900f\u660e\u753b\u5237\u9009\u5165DC
dc.Rectangle(CRect(m_ptOrigin,point));
dc.SelectObject(pOldBrush);//\u91ca\u653e\u900f\u660e\u753b\u5237
\u8bf4\u660e\uff1a
The GetStockObject function retrieves a handle to one of the predefined stock pens, brushes, fonts, or palettes.
HGDIOBJ GetStockObject(
int fnObject // type of stock object
);
Returns a pointer to a CBrush object when given a handle to a Windows HBRUSH object.
static CBrush* PASCAL FromHandle( HBRUSH hBrush );//FromHandle\u662f\u4e00\u4e2a\u9759\u6001\u65b9\u6cd5\uff0c\u6545\u53ef\u7528CBrush::FromHandle()\u5f62\u5f0f\u8c03\u7528\u3002
\u6ce8\u610f\u70b9\uff1a
1\uff09\u9759\u6001\u65b9\u6cd5\u4e0d\u5c5e\u4e8e\u67d0\u4e00\u4e2a\u5177\u4f53\u5bf9\u8c61\uff0c\u800c\u5c5e\u4e8e\u7c7b\u672c\u8eab\uff0c\u5728\u7c7b\u52a0\u8f7d\u7684\u65f6\u5019\u5c31\u5df2\u7ecf\u4e3a\u7c7b\u9759\u6001\u65b9\u6cd5\u5206\u914d\u4e86\u4ee3\u7801\u53bb\uff0c\u6545\u53ef\u7528CBrush::FromHandle()\u5f62\u5f0f\u8c03\u7528\u3002
2\uff09\u9759\u6001\u65b9\u6cd5\u4e2d\uff0c\u4e0d\u80fd\u5f15\u7528\u975e\u9759\u6001\u7684\u6570\u636e\u6210\u5458\u548c\u65b9\u6cd5\u3002
3\uff09\u9759\u6001\u6570\u636e\u6210\u5458\u9700\u8981\u5728\u7c7b\u5916\u5355\u72ec\u505a\u521d\u59cb\u5316\uff0c\u5f62\u5f0f\u5982\uff1a \u53d8\u91cf\u7c7b\u578b \u7c7b\u540d::\u53d8\u91cf\u540d=\u521d\u59cb\u503c;
8\uff0cCDC::SetROP2\u65b9\u6cd5\uff1a
int SetROP2( int nDrawMode );
Sets the current drawing mode.
(5)\u6587\u672c\u7f16\u7a0b
1,\u521b\u5efa\u63d2\u5165\u7b26\uff1a
void CreateSolidCaret( int nWidth, int nHeight );//\u521b\u5efa\u63d2\u5165\u7b26
void CreateCaret( CBitmap* pBitmap );//\u521b\u5efa\u4f4d\u56fe\u63d2\u5165\u7b26
void ShowCaret( );//\u663e\u793a\u63d2\u5165\u7b26
void HideCaret( );//\u9690\u85cf\u63d2\u5165\u7b26
static void PASCAL SetCaretPos( POINT point );//\u79fb\u52a8\u63d2\u5165\u7b26\u53f7
\u8bf4\u660e\uff1a
1\uff09\u521b\u5efa\u63d2\u5165\u7b26\u8981\u5728\u7a97\u53e3\u521b\u5efa\u5b8c\u6210\u4e4b\u540e\uff0cCreateSolidCaret\u51fd\u6570\u521b\u5efa\u7684\u63d2\u5165\u7b26\u88ab\u521d\u59cb\u5316\u4e3a\u9690\u85cf\uff0c\u6240\u4ee5\u9700\u8981\u8c03\u7528ShowCaret()\u5c06\u5176\u663e\u793a\u3002
2\uff09\u4f7f\u7528CreateCaret\u51fd\u6570\u521b\u5efa\u4f4d\u56fe\u63d2\u5165\u7b26\u7684\u65f6\u5019\uff0c\u4e0d\u80fd\u4f7f\u7528\u5c40\u90e8\u7684\u4f4d\u56fe\u5bf9\u8c61\u5173\u8054\u4f4d\u56fe\u8d44\u6e90\u3002\uff08\u4e0e\u8d44\u6e90\u76f8\u5173\u8054\u7684C++\u5bf9\u8c61\uff0c\u5f53\u5b83\u6790\u6784\u7684\u65f6\u5019\u4f1a\u540c\u65f6\u628a\u4e0e\u5b83\u76f8\u5173\u8054\u7684\u8d44\u6e90\u9500\u6bc1\u3002\uff09
2\uff0c\u83b7\u53d6\u5f53\u524d\u5b57\u4f53\u4fe1\u606f\u7684\u5ea6\u91cf\uff1aCDC::GetTextMetrics
BOOL GetTextMetrics( LPTEXTMETRIC lpMetrics ) const;
\u8bf4\u660e\uff1a
typedef struct tagTEXTMETRIC {
int tmHeight;//\u5b57\u4f53\u9ad8\u5ea6\u3002Specifies the height (ascent + descent) of characters.
int tmAscent;//\u57fa\u7ebf\u4ee5\u4e0a\u7684\u5b57\u4f53\u9ad8\u5ea6
int tmDescent;//\u57fa\u7ebf\u4ee5\u4e0b\u7684\u5b57\u4f53\u9ad8\u5ea6
int tmInternalLeading;
int tmExternalLeading;
int tmAveCharWidth;//\u5b57\u7b26\u5e73\u5747\u5bbd\u5ea6
int tmMaxCharWidth;
int tmWeight;
BYTE tmItalic;
BYTE tmUnderlined;
BYTE tmStruckOut;
BYTE tmFirstChar;
BYTE tmLastChar;
BYTE tmDefaultChar;
BYTE tmBreakChar;
BYTE tmPitchAndFamily;
BYTE tmCharSet;
int tmOverhang;
int tmDigitizedAspectX;
int tmDigitizedAspectY;
} TEXTMETRIC;
3\uff0cOnDraw\u51fd\u6570:
virtual void OnDraw( CDC* pDC )
\u5f53\u7a97\u53e3\uff08\u4ece\u65e0\u5230\u6709\u6216\u5c3a\u5bf8\u5927\u5c0f\u6539\u53d8\u7b49\uff09\u8981\u6c42\u91cd\u7ed8\u7684\u65f6\u5019\uff0c\u4f1a\u53d1\u9001WM_PAIN\u6d88\u606f\uff0c\u8c03\u7528OnDraw\u51fd\u6570\u8fdb\u884c\u91cd\u7ed8\u3002
4,\u83b7\u53d6\u5b57\u7b26\u4e32\u7684\u9ad8\u5ea6\u548c\u5bbd\u5ea6\uff08\u533a\u522b\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\uff09\uff1a
CDC::GetTextExtent
CSize GetTextExtent( LPCTSTR lpszString, int nCount ) const;
CSize GetTextExtent( const CString& str ) const;
\u8bf4\u660e\uff1a
The CSize class is similar to the Windows SIZE structure\u3002
typedef struct tagSIZE {
int cx;//the x-extent
int cy;//the y-extent
} SIZE;
5\uff0c\u8def\u5f84\u5c42\uff1a
BOOL BeginPath( );
//\u5728\u8fd9\u4f5c\u56fe\u5b9a\u4e49\u8def\u5f84\u5c42\u526a\u5207\u533a\u57df
BOOL EndPath( );
BOOL SelectClipPath( int nMode );//\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\u6765\u4f7f\u5f53\u524d\u8def\u5f84\u5c42\u526a\u5207\u533a\u57df\u4e0e\u65b0\u526a\u5207\u533a\u57df\u8fdb\u884c\u4e92\u64cd\u4f5c\u3002
//\u5728\u8fd9\u8986\u76d6\u4f5c\u56fe\uff08\u5305\u542b\u524d\u5b9a\u4e49\u7684\u8def\u5f84\u5c42\u533a\u57df\uff09\u5b9a\u4e49\u65b0\u7684\u526a\u5207\u533a\u57df
\u8bf4\u660e\uff1a
1\uff09SelectClipPath Selects the current path as a clipping region for the device context, combining the new region with any existing clipping region by using the specified mode. The device context identified must contain a closed path.
////
nMode\uff1aRGN_AND\uff0cRGN_COPY\uff0cRGN_DIFF\uff0cRGN_OR\uff0cRGN_XOR
RGN_AND The new clipping region includes the intersection (overlapping areas) of the current clipping region and the current path.
RGN_COPY The new clipping region is the current path.
RGN_DIFF The new clipping region includes the areas of the current clipping region, and those of the current path are excluded.
RGN_OR The new clipping region includes the union (combined areas) of the current clipping region and the current path.
RGN_XOR The new clipping region includes the union of the current clipping region and the current path, but without the overlapping areas.
2\uff09\u5e94\u7528\uff1a\u5f53\u4f5c\u56fe\u7684\u65f6\u5019\uff0c\u5982\u679c\u60f3\u8981\u5728\u6574\u5e45\u56fe\u5f62\u5176\u4e2d\u7684\u67d0\u4e2a\u90e8\u5206\u548c\u5176\u5b83\u90e8\u5206\u6709\u6240\u533a\u522b\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u8fd9\u90e8\u5206\u56fe\u5f62\u653e\u5230\u8def\u5f84\u5c42\u5f53\u4e2d\uff0c\u7136\u540e\u6307\u5b9a\u8c03\u7528\u6307\u5b9a\u4e92\u64cd\u4f5c\u6a21\u5f0f\u8c03\u7528SelectClipPath( int nMode )\u51fd\u6570\u6765\u4f7f\u8def\u5f84\u5c42\u548c\u8986\u76d6\u5728\u5176\u4e0a\u65b0\u7ed8\u56fe\u526a\u5207\u533a\u57df\u8fdb\u884c\u4e92\u64cd\u4f5c\uff0c\u8fbe\u5230\u7279\u6b8a\u6548\u679c\u3002
6\uff0c\u5173\u4e8e\u6587\u672c\u5b57\u7b26\u4e32\u4e00\u4e9b\u51fd\u6570\uff1a
COLORREF GetBkColor( ) const;//\u5f97\u5230\u80cc\u666f\u989c\u8272
virtual COLORREF SetBkColor( COLORREF crColor );//\u8bbe\u7f6e\u80cc\u666f\u989c\u8272
BOOL SetTextBkColor( COLORREF cr );//\u8bbe\u7f6e\u6587\u672c\u80cc\u666f\u989c\u8272
virtual COLORREF SetTextColor( COLORREF crColor );//\u8bbe\u7f6e\u6587\u672c\u989c\u8272
virtual BOOL TextOut( int x, int y, LPCTSTR lpszString, int nCount );//\u8f93\u51fa\u6587\u672c
BOOL TextOut( int x, int y, const CString& str );
CString Left( int nCount ) const;//\u5f97\u5230\u5b57\u7b26\u4e32\u5de6\u8fb9nCount\u4e2a\u5b57\u7b26
int GetLength( ) const;//\u5f97\u5230\u5b57\u7b26\u4e32\u957f\u5ea6
7,\u5b57\u4f53CFont::CFont
CFont( );//\u6784\u9020\u51fd\u6570
//Constructs a CFont object. The resulting object must be initialized with CreateFont, CreateFontIndirect, CreatePointFont, or CreatePointFontIndirect before it can be used.
\u9009\u7528\u5b57\u4f53\u4e8b\u4f8b\u4ee3\u7801\u7ec4\uff1a
CClientDC dc(this);
CFont font;//\u6784\u9020\u5b57\u4f53\u5bf9\u8c61
font.CreatePointFont(300,"\u534e\u6587\u884c\u6977",NULL);//\u521d\u59cb\u5316\u5b57\u4f53\u5bf9\u8c61\uff0c\u4e0e\u5b57\u4f53\u8d44\u6e90\u76f8\u5173\u8054
CFont *pOldFont=dc.SelectObject(&font);//\u5c06\u65b0\u5b57\u4f53\u9009\u5165DC
...
dc.SelectObject(pOldFont);//\u6062\u590d\u539f\u5b57\u4f53
\u8bf4\u660e\uff1a
1\uff09\u6784\u9020\u5b57\u4f53\u5bf9\u8c61\u65f6\u5019\uff0c\u5fc5\u987b\u521d\u59cb\u5316\u3002\uff08\u521d\u59cb\u5316\u662f\u5c06\u5b57\u4f53\u5bf9\u8c61\u4e0e\u5b57\u4f53\u8d44\u6e90\u76f8\u5173\u8054\uff09\u3002
2\uff09\u521d\u59cb\u5316\u5bf9\u8c61\u65f6\u5019\uff0c\u9009\u7528\u7684\u5b57\u4f53\u4e5f\u53ef\u4ee5\u662f\u7cfb\u7edf\u5b57\u4f53\uff0c\u4f46\u4e0d\u4e00\u5b9a\u90fd\u6709\u6548\uff0c\u636e\u6d4b\u8bd5\u9009\u7528\u3002
8\uff0c\u5728MFC\u4e2dCEditView \u548c cRichEditView\u7c7b\u5df2\u7ecf\u5b8c\u6210\u4e86\u521d\u6b65\u7684\u6587\u5b57\u5904\u7406\u3002\u53ef\u4ee5\u8ba9\u5e94\u7528\u7a0b\u5e8f\u7684View\u7c7b\u4ee5CEditView \u548c cRichEditView\u7c7b\u4e3a\u57fa\u7c7b\u3002
9\uff0c\u5e73\u6ed1\u53d8\u8272
CDC::TextOut()\u662f\u4e00\u4e2a\u5b57\u6bcd\u4e00\u4e2a\u5b57\u6bcd\u7684\u8f93\u51fa\uff0c\u8fbe\u4e0d\u5230\u5e73\u6ed1\u6548\u679c\u3002
CDC::DrawText()\uff1a\u5c06\u6587\u5b57\u7684\u8f93\u51fa\u5c40\u9650\u4e8e\u4e00\u4e2a\u77e9\u5f62\u533a\u57df\uff0c\u8d85\u51fa\u77e9\u5f62\u533a\u57df\u7684\u6587\u5b57\u90fd\u88ab\u622a\u65ad\u3002\u5229\u7528\u8fd9\u4e00\u7279\u70b9\uff0c\u53ef\u6bcf\u9694\u4e9b\u65f6\u95f4\u589e\u52a0\u77e9\u5f62\u5927\u5c0f\uff0c\u4ece\u800c\u53ef\u5b9e\u73b0\u4eba\u773c\u4e2d\u7684\u5e73\u6ed1\u6548\u679c\u3002
CWnd::SetTimer()\uff1a\u8bbe\u7f6e\u5b9a\u65f6\u5668\u3002\u6309\u8bbe\u5b9a\u7684\u65f6\u95f4\u5b9a\u65f6\u53d1\u9001WM_TIMER\u6d88\u606f\u3002
\u8bf4\u660e\uff1a
UINT SetTimer( UINT nIDEvent, UINT nElapse, void (CALLBACK EXPORT* lpfnTimer)(HWND, UINT, UINT, DWORD) );
//nIDEvent\u5b9a\u65f6\u5668\u6807\u793a\uff0cnElapse\u6d88\u606f\u53d1\u9001\u95f4\u9694\u65f6\u95f4\uff0cvoid (CALLBACK EXPORT* lpfnTimer)(HWND, UINT, UINT, DWORD)\u8bbe\u7f6e\u56de\u8c03\u51fd\u6570\uff0c\u5982\u679c\u8bbe\u7f6e\u5219\u7531\u8bbe\u7f6e\u7684\u56de\u8c03\u51fd\u6570\u5904\u7406WM_TIMER\u6d88\u606f\uff0c\u5982\u679c\u6ca1\u6709\u8bbe\u7f6e\u56de\u8c03\u51fd\u6570\u8bbe\u4e3aNULL\uff0c\u8fd9\u53d1\u9001\u7684WM_TIMER\u6d88\u606f\u538b\u5165\u6d88\u606f\u961f\u5217\uff0c\u4ea4\u7531\u76f8\u5173\u8054\u7684\u7a97\u53e3\u5904\u7406\uff08\u6dfb\u52a0WM_TIMER\u6d88\u606f\u5904\u7406\u51fd\u6570OnTimer()\uff09\u3002
afx_msg void OnTimer( UINT nIDEvent );
//\u54cd\u5e94WM_TIMER\u6d88\u606f\uff0cnIDEvent\u4e3a\u6d88\u606f\u5bf9\u5e94\u5b9a\u65f6\u5668\u6807\u793a\uff08\u53ef\u4ee5\u8bbe\u7f6e\u4e0d\u540c\u7684\u5b9a\u65f6\u5668\u53d1\u9001WM_TIMER\u6d88\u606f\uff09
情报检索系统具有情报的存储和检索两种基本功能。存储，即将搜集到的文献、数据进行分析、加工，给出检索标识和地址，组成卡片目录或记录在磁带或光学的载体上组成情报数据库。检索，即人工地或自动地从卡片目录或情报数据库中查找所需的情报。因此，情报的存储和检索是情报检索系统的两个不可分割的环节。
情报检索系统的效率是衡量检索服务的一项重要标志，它与情报加工的质量、数据库结构和检索人员的素质有着密切关系。
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