编程技巧20法(11-20)

天云上人 · 发表于 2004-1-4 21:09:15

编程技巧20法(11-20)
徐景周
日期:2002-09-12


11. 如何判断当前操作系统的版本

//------------------------------------------------------------------------------------------------

//判断操作系统涵数及变量

typedef enum tagWin32SysType{
Windows32s,
WindowsNT3,
Windows95,
Windows98,
WindowsME,
WindowsNT4,
Windows2000,
WindowsXP
}Win32SysType;

//判断操作系统涵数及变量，jingzhou xu

Win32SysType IsShellSysType()
{
Win32SysType  ShellType;
DWORD winVer;
OSVERSIONINFO *osvi;

winVer=GetVersion();

if(winVer<0x80000000){/*NT */
      ShellType=WindowsNT3;
      osvi= (OSVERSIONINFO *)malloc(sizeof(OSVERSIONINFO));
      if (osvi!=NULL){
         memset(osvi,0,sizeof(OSVERSIONINFO));
         osvi->dwOSVersionInfoSize=sizeof(OSVERSIONINFO);
         GetVersionEx(osvi);
         if(osvi->dwMajorVersion==4L)ShellType=WindowsNT4;
         else if(osvi->dwMajorVersion==5L&&osvi->dwMinorVersion==0L)ShellType=Windows2000;
         else if(osvi->dwMajorVersion==5L&&osvi->dwMinorVersion==1L)ShellType=WindowsXP;
         free(osvi);
      }
}
else if  (LOBYTE(LOWORD(winVer))<4)
      ShellType=Windows32s;
else{
      ShellType=Windows95;
      osvi= (OSVERSIONINFO *)malloc(sizeof(OSVERSIONINFO));
      if (osvi!=NULL){
         memset(osvi,0,sizeof(OSVERSIONINFO));
         osvi->dwOSVersionInfoSize=sizeof(OSVERSIONINFO);
         GetVersionEx(osvi);
         if(osvi->dwMajorVersion==4L&&osvi->dwMinorVersion==10L)ShellType=Windows98;
         else if(osvi->dwMajorVersion==4L&&osvi->dwMinorVersion==90L)ShellType=WindowsME;
         free(osvi);
      }
}
return ShellType;
}

//------------------------------------------------------------------------------------------------

12. 如何在指定矩形框内水平/垂直显示多行文字

///////////////////////////////////////////////////////
//说明：
//  在矩形框中水平或垂直显示多行文字，jingzhou xu.
//  lMode: 排列方式，0:水平方式; 1:垂直对齐
//  lHori: 水平对齐方式, 0:左对齐; 1:居中; 2:右对齐; 3：自定义
//  lVert: 垂直对齐方式, 0:顶对齐; 1:居中; 2:底对齐; 3：自定义
///////////////////////////////////////////////////////

CRect DrawTitleInRect(CDC *pDC, CString szString, LPRECT lpRect, long lMode, long lHori, long lVert)
{
TEXTMETRIC tm;
pDC->GetTextMetrics(&tm);
int tmpWidth=tm.tmAveCharWidth, tmpHeight=tm.tmHeight;

CRect rcInner(lpRect);
if(lMode==0)
{
      rcInner.left+=tmpWidth;
      rcInner.right-=tmpWidth;
      rcInner.top-=tmpWidth;
      rcInner.bottom+=tmpWidth;
}
if(lMode==1)
{
      rcInner.left+=tmpWidth;
      rcInner.right=rcInner.left+tmpWidth;
      rcInner.top-=tmpWidth;
      rcInner.bottom+=tmpWidth;
}

pDC->DrawText(szString, rcInner,DT_CALCRECT);
switch(lHori)
{
case 0:
      break;
case 1:
      {
         long xOutCent=(lpRect->right+lpRect->left)/2;
         long xInnCent=(rcInner.right+rcInner.left)/2;
         rcInner.left+=(xOutCent-xInnCent);
         rcInner.right+=(xOutCent-xInnCent);
      }
      break;
case 2:
      {
         long lInWidth=rcInner.right-rcInner.left;
         rcInner.right=lpRect->right-tmpWidth;
         rcInner.left=rcInner.right-lInWidth;
      }
      break;
default:
      break;
}

switch(lVert)
{
case 0:
      break;
case 1:
      {
         long yOutCent=(lpRect->bottom+lpRect->top)/2;
         long yInnCent=(rcInner.bottom+rcInner.top)/2;
         rcInner.top-=(yInnCent-yOutCent);
         rcInner.bottom-=(yInnCent-yOutCent);
      }
      break;
case 2:
      {
         long lInHeigh=rcInner.top-rcInner.bottom;
         rcInner.bottom=lpRect->bottom+tmpWidth;
         rcInner.top=rcInner.bottom+lInHeigh;
      }
      break;
default:
      break;
}

//---------------------------------------------------------------------------------------------
//功能：根据新、老矩形，重新计算行数，使文字多行显示,jingzhou xu
//---------------------------------------------------------------------------------------------
//一行中最大字符数
int nMaxLineChar = abs(lpRect->right - lpRect->left) / tmpWidth ;
//记录当前行的宽度
short theLineLength=0;
//记录当前行中汉字字节数，以防止将一半汉字分为两行
unsigned short halfChinese=0;

for(int i=0; i<=szString.GetLength()-1; i++)
{
      if(((unsigned char)szString.GetAt(i) == 0x0d) && ((unsigned char)szString.GetAt(i+1) == 0x0a))
         theLineLength=0;

   //大于0xa1的字节为汉字字节
      if((unsigned char)szString.GetAt(i) >= 0xA1)
         halfChinese++;
      theLineLength++;

      //如果行宽大于每行最大宽度，进行特殊处理
      if(theLineLength > nMaxLineChar)
      {
         //防止将一个汉字分为两行，回溯
         if(halfChinese%2)
         {
            szString.Insert(i,(unsigned char)0x0a);
            szString.Insert(i,(unsigned char)0x0d);
         }
         else
         {
            szString.Insert(i-1,(unsigned char)0x0a);
            szString.Insert(i-1,(unsigned char)0x0d);
         }

         theLineLength = 0;
      }
}

//重新计算矩形边界范围
// int tmpLine = int(abs(szString.GetLength()*tmpWidth / abs(lpRect->right - lpRect->left)-0.5));

// tmpLine += (szString.GetLength()*tmpWidth % abs(lpRect->right - lpRect->left))? 1 : 0;
// if(tmpLine == 0)
//       tmpLine = 1;

if(rcInner.bottom > lpRect->bottom)
      rcInner.bottom = lpRect->bottom;
if(rcInner.top < lpRect->top)
      rcInner.top = lpRect->top;

//---------------------------------------------------------------------------------------------

if(lHori==0)
      pDC->DrawText(szString, rcInner, DT_WORDBREAK|DT_LEFT);
else if(lHori==1)
      pDC->DrawText(szString, rcInner, DT_WORDBREAK|DT_CENTER);
else if(lHori==2)
      pDC->DrawText(szString, rcInner, DT_WORDBREAK|DT_RIGHT);
return rcInner;
}

13. 如何在指定矩形中旋转显示文字

///////////////////////////////////////////////////////
//说明：
//  在矩形框中旋转方式显示文字，jingzhou xu
//参数：
//  pDC:       DC指针
//  str:       显示文字
//  rect:       显示范围
//  angle:       旋转角度
// nOptions: ExtTextOut()中相应设置
///////////////////////////////////////////////////////

void DrawRotatedText(CDC* pDC, const CString str, CRect rect,
                  double angle, UINT nOptions)
{
//按比例转换角度值
double pi = 3.141592654;
double radian = pi * 2 / 360 * angle;

//获取显示文字中心点
CSize TextSize = pDC->GetTextExtent(str);
CPoint center;
center.x = TextSize.cx / 2;
center.y = TextSize.cy / 2;

//计算显示文字新的中心点
CPoint rcenter;
rcenter.x = long(cos(radian) * center.x - sin(radian) * center.y);
rcenter.y = long(sin(radian) * center.x + cos(radian) * center.y);

//绘制文字
pDC->SetTextAlign(TA_BASELINE);
pDC->SetBkMode(TRANSPARENT);
pDC->ExtTextOut(rect.left + rect.Width() / 2 - rcenter.x,
               rect.top + rect.Height() / 2 + rcenter.y,
               nOptions, rect, str, NULL);
}

14. 如何将32 x 32像素图标转换为16 x 16像素值的图标

HICON Convert32x32IconTo16x16(HICON h32x32Icon)
{
  HDC hMainDC, hMemDC1, hMemDC2;
  HICON h16x16Icon;
  BITMAP bmp;
  HBITMAP hOldBmp1, hOldBmp2;
  ICONINFO IconInfo32x32, IconInfo16x16;

  GetIconInfo(h32x32Icon, &IconInfo32x32);

  hMainDC = ::GetDC(m_hWnd);
  hMemDC1 = CreateCompatibleDC(hMainDC);
  hMemDC2 = CreateCompatibleDC(hMainDC);

  GetObject(IconInfo32x32.hbmColor, sizeof(BITMAP), &bmp);

  IconInfo16x16.hbmColor = CreateBitmap( 16, 16,
                                       bmp.bmPlanes,
                                       bmp.bmBitsPixel,
                                       NULL);

  hOldBmp1 = (HBITMAP) SelectObject( hMemDC1,
                                 IconInfo32x32.hbmColor);
  hOldBmp2 = (HBITMAP) SelectObject( hMemDC2,
                                 IconInfo16x16.hbmColor);

  StretchBlt(hMemDC2,
   0, 0,
   16, 16,
   hMemDC1,
   0, 0,
   32, 32,
   SRCCOPY
   );

  GetObject(IconInfo32x32.hbmMask, sizeof(BITMAP), &bmp);

  IconInfo16x16.hbmMask = CreateBitmap( 16, 16,
                                    bmp.bmPlanes,
                                    bmp.bmBitsPixel,
                                    NULL);

  SelectObject(hMemDC1, IconInfo32x32.hbmMask);
  SelectObject(hMemDC2, IconInfo16x16.hbmMask);

  StretchBlt(hMemDC2,
         0, 0,
         16, 16,
         hMemDC1,
         0, 0,
         32, 32,
         SRCCOPY
   );

  SelectObject(hMemDC1, hOldBmp1);
  SelectObject(hMemDC2, hOldBmp2);

  IconInfo16x16.fIcon = TRUE;
  h16x16Icon = CreateIconIndirect(&IconInfo16x16);
  DeleteObject(IconInfo32x32.hbmColor);
  DeleteObject(IconInfo16x16.hbmColor);
  DeleteObject(IconInfo32x32.hbmMask);
  DeleteObject(IconInfo16x16.hbmMask);
  DeleteDC(hMemDC1);
  DeleteDC(hMemDC2);

  ::ReleaseDC(m_hWnd, hMainDC);
  return h16x16Icon;
}

15. 如何建立一个灰度级图标

HICON CreateGrayscaleIcon(HICON hIcon)
{
  HICON    hGrayIcon = NULL;
  HDC       hMainDC = NULL,
            hMemDC1 = NULL,
            hMemDC2 = NULL;
  BITMAP    bmp;
  HBITMAP    hOldBmp1 = NULL,
            hOldBmp2 = NULL;
  ICONINFO csII, csGrayII;
  BOOL       bRetValue = FALSE;

  bRetValue = ::GetIconInfo(hIcon, &csII);

  if (bRetValue == FALSE) return NULL;

  hMainDC = ::GetDC(m_hWnd);
  hMemDC1 = ::CreateCompatibleDC(hMainDC);
  hMemDC2 = ::CreateCompatibleDC(hMainDC);
  if (hMainDC == NULL ||
hMemDC1 == NULL ||
hMemDC2 == NULL)
   return NULL;

  if (::GetObject(csII.hbmColor,
            sizeof(BITMAP), &
            amp;bmp))
  {
csGrayII.hbmColor =
      ::CreateBitmap(csII.xHotspot*2,
                     csII.yHotspot*2,
                     bmp.bmPlanes,
                     bmp.bmBitsPixel,
                     NULL);
if (csGrayII.hbmColor)
{
   hOldBmp1 =
      (HBITMAP)::SelectObject(hMemDC1,
                              csII.hbmColor);
   hOldBmp2 =
      (HBITMAP)::SelectObject(hMemDC2,
                              csGrayII.hbmColor);

   ::BitBlt(hMemDC2, 0, 0, csII.xHotspot*2,
            csII.yHotspot*2, hMemDC1, 0, 0,
            SRCCOPY);

   DWORD dwLoopY = 0, dwLoopX = 0;
   COLORREF crPixel = 0;
   BYTE    byNewPixel = 0;
   for (dwLoopY = 0; dwLoopY < csII.yHotspot*2; dwLoopY++)
   {
      for (dwLoopX = 0; dwLoopX < csII.xHotspot*2; dwLoopX++)
      {
      crPixel = ::GetPixel(hMemDC2, dwLoopX, dwLoopY);
      byNewPixel = (BYTE)((GetRValue(crPixel) * 0.299) +
            (GetGValue(crPixel) * 0.587) +
            (GetBValue(crPixel) * 0.114));
      if (crPixel) ::SetPixel(hMemDC2,
                              dwLoopX,
                              dwLoopY,
                              RGB(byNewPixel,
                              byNewPixel,
                              byNewPixel));
   } // for
   } // for
   ::SelectObject(hMemDC1, hOldBmp1);
   ::SelectObject(hMemDC2, hOldBmp2);

   csGrayII.hbmMask = csII.hbmMask;
   csGrayII.fIcon = TRUE;
   hGrayIcon = ::CreateIconIndirect(&csGrayII);
} // if
:

eleteObject(csGrayII.hbmColor);
//:

eleteObject(csGrayII.hbmMask);
} // if
:

eleteObject(csII.hbmColor);
  ::DeleteObject(csII.hbmMask);
  ::DeleteDC(hMemDC1);
  ::DeleteDC(hMemDC2);
  ::ReleaseDC(m_hWnd, hMainDC);

  return hGrayIcon;
}

16. 如何按指定角度旋转显示内存位图(用法和BitBlt类似)

void RotBlt(HDC destDC, int srcx1, int srcy1, int srcx2, int srcy2,

  HDC srcDC , int destx1, int desty1 ,int thetaInDegrees ,DWORD mode)
{
  double theta = thetaInDegrees * (3.14159/180);

  //原图像原始大小

  int width = srcx2 - srcx1;
  int height = srcy2 - srcy1;

  //原图像中心点
  int centreX = int(float(srcx2 + srcx1)/2);
  int centreY = int(float(srcy2 + srcy1)/2);

  //判断出图像可以沿任意方向旋转的矩形框
  if(width>height)height = width;
  else
width = height;

  HDC memDC = CreateCompatibleDC(destDC);
  HBITMAP memBmp = CreateCompatibleBitmap(destDC, width, height);

  HBITMAP obmp = (HBITMAP) SelectObject(memDC, memBmp);

  //内存DC新在中心点

  int newCentre = int(float(width)/2);
  //开始旋转
  for(int x = srcx1; x<=srcx2; x++)
for(int y = srcy1; y<=srcy2; y++)
{
   COLORREF col = GetPixel(srcDC,x,y);
   int newX = int((x-centreX)*sin(theta)+(y-centreY)*cos(theta));
   int newY = int((x-centreX)*cos(theta)-(y-centreY)*sin(theta));
   SetPixel(memDC , newX + newCentre, newY + newCentre, col);
}

  //复制到目标DC上
  BitBlt(destDC, destx1, desty1, width, height, memDC, 0,0,mode);
  //释放内存
  SelectObject(memDC, obmp);
  DeleteDC(memDC);
  DeleteObject(memBmp);
}

用法：

RotBlt(dc, 0,0,150,150,memDC,200,0, 45, SRCCOPY);

17. 如何将指定的窗体，以位图形式复制到系统剪切板上

void CScreenSnapDlg::toClipboard_Bio(CWnd * wnd, BOOL FullWnd)
{
   CDC *dc;
   if(FullWnd)
      { /* 抓取整个窗口 */
      dc = new CWindowDC(wnd);
      } /* 抓取整个窗口 */
   else
      { /* 仅抓取客户区时 */
      dc = new CClientDC(wnd);
      } /* 仅抓取客户区时 */

   CDC memDC;
   memDC.CreateCompatibleDC(dc);

   CBitmap bm;
   CRect r;
   if(FullWnd)
      wnd->GetWindowRect(&r);
   else
      wnd->GetClientRect(&r);

   CString s;
   wnd->GetWindowText(s);
   CSize sz(r.Width(), r.Height());

   bm.CreateCompatibleBitmap(dc, sz.cx, sz.cy);
   CBitmap * oldbm = memDC.SelectObject(&bm);
   memDC.BitBlt(0, 0, sz.cx, sz.cy, dc, 0, 0, SRCCOPY);

   //直接调用OpenClipboard()，而不用wnd->GetParent()->OpenClipboard();
   wnd->OpenClipboard();
   ::EmptyClipboard();
   ::SetClipboardData(CF_BITMAP, bm.m_hObject);
   CloseClipboard();

   //恢复原始环境
   memDC.SelectObject(oldbm);
   bm.Detach();
   delete dc;
}

18. 如何替换HBITMAP中的颜色值

#define COLORREF2RGB(Color) (Color & 0xff00) | ((Color >> 16) & 0xff) \
                                          | ((Color << 16) & 0xff0000)

HBITMAP ReplaceColor (HBITMAP hBmp,COLORREF cOldColor,COLORREF cNewColor)
{
HBITMAP RetBmp=NULL;
if (hBmp)
{
      HDC BufferDC=CreateCompatibleDC(NULL);       // 源位图DC
      if (BufferDC)
      {
         SelectObject(BufferDC,hBmp); 　 // 选入DC中
         HDC DirectDC=CreateCompatibleDC(NULL);    // 目标DC
         if (DirectDC)
         {
            // 获取源位图大小
            BITMAP bm;
            GetObject(hBmp, sizeof(bm), &bm);

            // 初始化BITMAPINFO信息，以便使用CreateDIBSection
            BITMAPINFO RGB32BitsBITMAPINFO;
            ZeroMemory(&RGB32BitsBITMAPINFO,sizeof(BITMAPINFO));
            RGB32BitsBITMAPINFO.bmiHeader.biSize=sizeof(BITMAPINFOHEADER);
            RGB32BitsBITMAPINFO.bmiHeader.biWidth=bm.bmWidth;
            RGB32BitsBITMAPINFO.bmiHeader.biHeight=bm.bmHeight;
            RGB32BitsBITMAPINFO.bmiHeader.biPlanes=1;
            RGB32BitsBITMAPINFO.bmiHeader.biBitCount=32;

            UINT * ptPixels;
            HBITMAP DirectBitmap= CreateDIBSection(DirectDC,
                     (BITMAPINFO *)&RGB32BitsBITMAPINFO,
                     DIB_RGB_COLORS,(void **)&ptPixels, NULL, 0);
            if (DirectBitmap)
            {
                  HGDIOBJ PreviousObject=SelectObject(DirectDC, DirectBitmap);
                  BitBlt(DirectDC,0,0,bm.bmWidth,bm.bmHeight,BufferDC,0,0,SRCCOPY);

                  // 转换 COLORREF 为 RGB
                  cOldColor=COLORREF2RGB(cOldColor);
                  cNewColor=COLORREF2RGB(cNewColor);
                  // 替换颜色
                  for (int i=((bm.bmWidth*bm.bmHeight)-1);i>=0;i--)
                  {
                     if (ptPixels==cOldColor) ptPixels=cNewColor;
* v7 C0 g  T+ O# A2 s; t" f                   }
; z9 b. ]( R7 _8 [                + R# e. R& a9 Y1 R9 K
                  // 修改位图 DirectBitmap! r- m2 A! N1 a6 l
                  SelectObject(DirectDC,PreviousObject);
4 i% E7 F7 Y) R
9 P9 o2 e2 R. b  _1 G, Z                   // 完成# s) G3 F$ \; O/ J
                  RetBmp=DirectBitmap;
9 r& E+ S' i& V7 g! t             }/ j5 G5 s( x$ u  y% l6 N
            // 释放DC
$ l3 b# u. {  v' H% a             DeleteDC(DirectDC);  x- k2 ~# P) F. J9 F- c- K- g2 N
         }
) M8 u" }; @9 _+ o: W          // 释放DC
* S0 F2 s9 Y4 f3 j; m& F* h* J          DeleteDC(BufferDC);$ g% b! J& z: }& [# L
      }$ Y9 l% G- P: ?2 ?( c  L
}0 @0 @1 |1 \9 v
return RetBmp;
) ]( h4 H  R/ @" K}% W- [; _$ S+ L2 v- P
# A% N1 D. c& Q- U* d  r  O
. P) M) G* A  C0 ?
用法：$ R+ N( _' q9 m# D% U# W
) X  y8 B( ^" s- W* Y3 m: d
HBITMAP hBmp2 = LoadBitmap(g_hinstance,MAKEINTRESOURCE(IDB_SAMPLEBITMAP));
% ?. i0 ]3 o: y9 V% @; gHBITMAP hBmp = ReplaceColor(hBmp2,0xff0000,0x00ff00); // 替换蓝色为绿色* p; m( a3 S) o; G% t. ~6 @7 r
......
; X* I8 H0 P6 x$ |* n' z$ u
, B- `" B' r. Z& Z8 c0 B0 yDeleteObject(hBmp2);! z  }& ]$ \1 y9 k8 X8 _. P- t( D  z
DeleteObject(hBmp);% `) {1 B1 |! P* A
. ]7 y5 x9 W) B% }  B& {& H& F

: T1 S6 O. d. B* c19. 如何转换并保存位图! [3 B& d3 q) B  W1 b) ~
) G! k& C- ?& w/ N0 j
//********************************************************************************
& Y6 D( ?, b( k5 J) q//* 名称：DDBToDIB1 K* F3 S, B% d8 o
//* 作者：徐景周(jingzhou_xu@163.net)  c  w$ t$ E5 V# q& c
//* 功能：设备相关转换为设备无关位图: k' N: z, A- O: h
//********************************************************************************3 m& H# F1 K1 D( b- r9 |
% v5 d! U  Y% B: `
HANDLE CScreenSnapDlg::DDBToDIB( CBitmap& bitmap, DWORD dwCompression /* = BI_RGB */) " S1 E; H* c* s
{( z: p$ r2 i$ P; P
BITMAP             bm;8 X2 a+ |0 w( Z
BITMAPINFOHEADER bi;7 d! A8 |, p2 A, \
LPBITMAPINFOHEADER  lpbi;" w/ H' j9 i# J' X) X
DWORD             dwLen;6 X+ d7 \! j7 `  h  d# J  `6 Q
HANDLE             hDIB;& f+ ?# [4 V1 Y4 K, M
HANDLE             handle;
; P/ z) b( D+ a6 p) E3 g- r/ ` HDC                   hDC;7 B' j& R+ _' o: }
HPALETTE          hPal;
; P+ W8 d2 K* K; A. V" r7 {( B4 S+ b  r& i" K, C
CWindowDC          dc( this );
. W( U1 Q3 B0 j6 W CPalette          pal;
& A! I9 P( Q& v& P$ x$ }( D //如果支持调色板的话，则建立它
- K9 O; C/ R% s1 x  G$ T if( dc.GetDeviceCaps( RASTERCAPS ) & RC_PALETTE )" C& O) B! E& t4 K0 E; T
{
/ |" L, \* l* c% ~% @- U. ^, I       UINT       nSize = sizeof(LOGPALETTE) + ( sizeof(PALETTEENTRY) * 256 );
+ S8 n; \5 C) s       LOGPALETTE* pLP    = (LOGPALETTE*)new BYTE[nSize];
. u; o9 J/ Y0 s9 N9 t0 N8 M       pLP->palVersion    = 0x300;! G7 h( a. S* q9 d
      pLP->palNumEntries = (unsigned short)GetSystemPaletteEntries( dc, 0, 255,
3 i2 A8 G8 C# s( Q. w       pLP->palPalEntry );
+ t* D4 q4 e# q! Z* o5 I& {& G
4 Y1 j* u* p5 M: X5 h0 s       pal.CreatePalette( pLP );9 d  l% ], Z0 F9 F
( q" L+ A( ~! O$ b
      //释放
8 U1 I+ H+ R0 N; A) m" k, d  i       delete[] pLP;& y1 ?0 y& L1 n7 L
}
% a6 A7 t' U7 C2 X5 K6 Z8 @1 _% r
3 h( R, t9 B) r: ~4 k' Q/ A ASSERT( bitmap.GetSafeHandle() );0 Y6 k# f  p6 r
& Z% V2 ?# Z& I4 y) g
+ B' R* ~4 i9 v# |9 o
//不支持BI_BITFIELDS类型
0 c4 B# ~  s# I% G9 N: F2 i; k if( dwCompression == BI_BITFIELDS )
( ?' j. T' H/ v6 L       return NULL;
0 f/ ?' u7 s7 ]% ]( @/ P
' A3 L, R% U" Q2 a" t: o$ E //如果调色板为空，则用默认调色板. V: E, K  V* Y0 z
hPal = (HPALETTE) pal.GetSafeHandle();
8 q6 H) I' ]- {. _& P) E if (hPal==NULL)
7 c; i/ S, l( S' x' q% b       hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE);
* i; w- e6 r$ Y/ l5 @" ~3 _- S9 ]3 c* F, _- B% A
//获取位图信息+ ?& |5 A+ X4 {7 l" ~
bitmap.GetObject(sizeof(bm),(LPSTR)&bm);2 _" v( t2 T$ u8 p& Y+ ]! I

  v' c; S8 Y) Z9 @6 a //初始化位图信息头
- O) e* |  v  G# ]/ B bi.biSize       = sizeof(BITMAPINFOHEADER);
$ Y- O$ @" N6 ~* a- k" ^* a bi.biWidth       = bm.bmWidth;
3 t, A5 }# E* e+ d bi.biHeight       = bm.bmHeight;
3 ?) p  g, N0 K1 C bi.biPlanes       = 1;
- n9 m& S( l* N: b bi.biBitCount       = (unsigned short)(bm.bmPlanes * bm.bmBitsPixel) ;6 r  K) T* J* Z% H. H
bi.biCompression = dwCompression;
" a1 a6 R9 U: F9 o bi.biSizeImage       = 0;
2 K1 n6 r$ Q( i; ` bi.biXPelsPerMeter = 0;
3 y) ], A  {  p' _: B% m# T bi.biYPelsPerMeter = 0;
0 C+ f0 S+ H! I9 [! C( Z0 l6 ~ bi.biClrUsed       = 0;! U0 f3 m/ D: i* g2 e% {8 l
bi.biClrImportant = 0;
) r8 i: n2 g9 C2 u9 D7 {- i
3 O+ ]: I# o+ c1 Z* ]3 S. Z //计算信息头及颜色表大小
& i) a. ~0 a$ s! N7 I" ] int nColors = 0;
; e" R# g( _* d/ v if(bi.biBitCount <= 8)
: g, H7 u+ S  T       {9 O: I$ e* N9 x$ h
      nColors = (1 << bi.biBitCount);- M8 Q) i6 _! k
      }! ?1 H5 W2 v$ r9 A% P
dwLen  = bi.biSize + nColors * sizeof(RGBQUAD);
- x- L/ R/ u( l/ X) \2 u9 M. Q" D: ^0 J* ?% t
hDC = ::GetDC(NULL);
6 n3 \9 N3 }4 E: @ hPal = SelectPalette(hDC,hPal,FALSE);
7 c+ M) D) S' p" d8 | RealizePalette(hDC);
9 B" k, r& {/ p6 V0 G
/ x* k0 c2 R' d' Z7 E* g //为信息头及颜色表分配内存
. i' K9 }5 B# E, h' Z* L1 \1 u hDIB = GlobalAlloc(GMEM_FIXED,dwLen);
) n5 t# b! r8 a" n, t if (!hDIB){" K7 [3 ], q  N" q8 A
      SelectPalette(hDC,hPal,FALSE);$ M) Z4 _  V" |
      ::ReleaseDC(NULL,hDC);- p8 D9 Y. q+ A" w
      return NULL;! s* @  w0 }& \8 Z2 c6 v0 @1 v
}
7 f! v1 N) u& N0 i) T; @+ L5 w/ I: c' U- f
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);' e8 T& U. Q, Z
*lpbi = bi;5 F  ^+ k4 i; z0 l/ k& `7 d
" o: M9 {2 `2 X
//调用 GetDIBits 计算图像大小
& j7 K: L% S# E" f/ R GetDIBits(hDC, (HBITMAP)bitmap.GetSafeHandle(), 0L, (DWORD)bi.biHeight,) W( Q. A9 P" j" _! ?$ }3 K
         (LPBYTE)NULL, (LPBITMAPINFO)lpbi, (DWORD)DIB_RGB_COLORS);
( n5 l$ g0 \# j, N
9 E3 ^, o: f$ I, Z! P$ J. I6 L bi = *lpbi;
& _1 Y" @6 u) X+ P' [
* C' M; O9 S& j0 _3 t" a5 Y* B //图像的每一行都对齐(32bit)边界
2 L5 a; J: `0 \8 \ if (bi.biSizeImage == 0){
; c. T4 R! F) j6 Q; S       bi.biSizeImage = ((((bi.biWidth * bi.biBitCount) + 31) & ~31) / 8)
6 V4 Z/ |6 c: C# w9 C* _- x                      * bi.biHeight;# y3 ~/ G1 X3 i% s  Q0 x/ h
      if (dwCompression != BI_RGB)
) V. A4 i) Q$ C% F7 C          bi.biSizeImage = (bi.biSizeImage * 3) / 2;4 O1 Q$ }( E& C# ~
}% A, m' n# s3 D' J6 L/ V* I9 C
//重新分配内存大小，以便放下所有数据
' {- A7 S) E* l( w# G$ A* X  l dwLen += bi.biSizeImage;
& N) h& A1 O+ c; i/ [ handle = GlobalReAlloc(hDIB, dwLen, GMEM_MOVEABLE) ;
1 L! ?3 h) Q6 H7 I. I; a if (handle != NULL)
, a1 a3 S# L, n2 t       hDIB = handle;
: y. N% P& P( i6 s7 e else
" W+ X. `/ X. Q8 L       {1 {! o2 k: @! L' {+ N, L9 K
      GlobalFree(hDIB);
4 v, F, Q% ~. O4 @
3 O& p+ E4 p+ s6 w: s5 J# y# _       //重选原始调色板- U! N( k, A9 ^5 Z0 [
      SelectPalette(hDC,hPal,FALSE);
& D7 i! [  y0 Y- }       ::ReleaseDC(NULL,hDC);
; ?+ {8 h6 z' H2 g3 g1 U       return NULL;' I2 K# ~9 I' G8 g7 w6 O! Z
      }; l* h! u- ^) d% d, W
//获取位图数据$ Q; ~1 i5 W$ X# r; j4 f  _
lpbi = (LPBITMAPINFOHEADER)hDIB;$ U+ _5 v3 I+ e
//最终获得的DIB
4 X0 C; b; h* Z" ? BOOL bGotBits = GetDIBits( hDC, (HBITMAP)bitmap.GetSafeHandle(),
9 t' {$ ^; K- G" H: o2 M             0L,                   //扫描行起始处7 |+ t! \3 |6 p6 c1 ~
            (DWORD)bi.biHeight,    //扫描行数! E( r0 F  ~' I7 R1 c
            (LPBYTE)lpbi          //位图数据地址
$ V9 b' J6 T: R3 h" W. S             + (bi.biSize + nColors * sizeof(RGBQUAD)),
* T4 L' B2 o1 ~             (LPBITMAPINFO)lpbi,    //位图信息地址
1 R" I4 G4 X) A, z             (DWORD)DIB_RGB_COLORS);  //颜色板使用RGB  V# Y1 Z7 ?; A7 W  ~
if( !bGotBits )
! K. z2 J, b  P+ V- \ {
, A+ }! B9 ?1 W3 U9 i: j' D0 T* E9 m       GlobalFree(hDIB);% F0 D; i# I/ M9 M4 e
      SelectPalette(hDC,hPal,FALSE);
7 |) |3 r2 o8 x6 e7 {$ b       ::ReleaseDC(NULL,hDC);1 t6 e5 K9 g& b" I+ I4 ]
      return NULL;# P, b* [3 _- {4 n" d( y
}
, z: b( F2 n/ P( S SelectPalette(hDC,hPal,FALSE);* H+ Z0 g  R& `9 h! F+ y/ [! E; f
::ReleaseDC(NULL,hDC);
  q0 E- f* p8 C& R2 Y return hDIB;) c/ [& Z3 y- f( C! [
}
, ^- s( z0 A9 @1 x, c2 ^
" f7 k: k) z6 m! t- u: l1 X! }# ]0 @" I3 o8 [1 p0 f; Z5 I
//********************************************************************************
; z2 X) L4 l7 w//* 名称：SaveBitmapToFile1 p7 [7 [$ x- C) Q5 ^- b: u; o1 q/ l
//* 修改：徐景周(jingzhou_xu@163.net)7 I1 s. P* k& O' H
//* 功能：保存为位图文件
  H/ B! N8 d2 q8 R  b3 f2 o# m2 Z//********************************************************************************; e9 W# g- O& ]7 P( O/ f4 ]: d1 w
BOOL CScreenSnapDlg::SaveBitmapToFile(HBITMAP hBitmap , CString lpFileName) 1 \/ V- f, Y7 V2 i" g! C  F. r
{; {$ D+ W1 E0 a4 ^. k' }# d
HDC             hDC;                         //设备描述表
$ q/ P* q7 _( [) j9 K0 W int             iBits;                         //当前显示分辨率下每个像素所占字节数
, K6 S8 _1 d5 Z0 T, c$ a' y WORD          wBitCount;                      //位图中每个像素所占字节数
0 [0 h; Q' D8 ^( C DWORD          dwPaletteSize=0,             //定义调色板大小，位图中像素字节大小，位图文件大小，写入文件字节数
/ ?; l2 \+ d) n+ ?7 R+ Y% K* E                   dwBmBitsSize,9 M" P& q; _( c4 B7 k) _* X4 z
                  dwDIBSize, dwWritten;
: y) K* d* e6 [# d! T8 r, e$ p BITMAP       Bitmap;
& x8 c! t$ @7 ^ BITMAPFILEHEADER bmfHdr;                      //位图属性结构
" w* K& b. y7 @* h0 M' \4 Q BITMAPINFOHEADER bi;                         //位图文件头结构
. e, m8 U2 x+ W# q9 h LPBITMAPINFOHEADER lpbi;                      //位图信息头结构
" E/ w; M6 ~, v3 {. w) p" k% C8 z+ U3 ~  i* ?2 @: v
HANDLE       fh, hDib, hPal,hOldPal=NULL; //指向位图信息头结构,定义文件，分配内存句柄，调色板句柄3 _  K" p5 R- t3 f. Y# |

2 J# ~0 ], P+ w5 E* X' S5 T# g' w7 f7 O
//计算位图文件每个像素所占字节数
- e7 i7 O: _, j$ x+ x hDC = CreateDC("DISPLAY",NULL,NULL,NULL);
2 o0 z$ {" z. d; |/ V2 g3 a" x' s iBits = GetDeviceCaps(hDC, BITSPIXEL) *
2 Q0 B8 u# }2 {# u! {' q GetDeviceCaps(hDC, PLANES);
  {3 N+ O  I1 Z( T, ~" E DeleteDC(hDC);+ r+ i/ ~* k# z1 j9 Z* V
if (iBits <= 1)
+ N# [- J' e- o7 r: O    wBitCount = 1;
* o5 Y! J# W1 i; @ else if (iBits <= 4); p5 ?( X1 M6 d! x2 l- r
   wBitCount = 4;9 k9 B9 B+ A  Z( Y1 d$ p9 A5 y
else if (iBits <= 8)7 F6 _2 x3 G, y2 T) X$ |, [7 m
   wBitCount = 8;
; n+ F" J3 A- ?6 N else if (iBits <= 24)$ y8 ?/ u, Q- _
   wBitCount = 24;/ x- e4 d1 Q  b' k" k: w
9 c1 j( K' u3 D; G0 b
//计算调色板大小
; `" Q9 d% r. y& S1 v+ }* O if (wBitCount <= 8)
9 e5 ]3 V/ F. J6 ?9 p    dwPaletteSize = (1 << wBitCount) *sizeof(RGBQUAD);
- |3 u8 b! W; F+ A, D
5 v) Y3 ]& f! M //设置位图信息头结构
/ R  j' s. u% w% P8 [4 V8 k GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
( i6 D* G+ ~7 Y& w9 f% ` bi.biSize          = sizeof(BITMAPINFOHEADER);
; {6 Z. z# P4 f/ h/ C9 h/ l. U bi.biWidth          = Bitmap.bmWidth;0 n3 y9 S/ F3 {3 M. u  j
bi.biHeight       = Bitmap.bmHeight;
; }- ]4 ~2 c9 _  b) s9 } bi.biPlanes       = 1;
. {1 A" e% A8 g bi.biBitCount       = wBitCount;
8 p& J% [& e( w( v bi.biCompression    = BI_RGB;
* |# a" M8 u# p* { bi.biSizeImage       = 0;
" n7 L5 S6 x! |4 e  G bi.biXPelsPerMeter    = 0;
3 ?$ g. s& f3 A& | bi.biYPelsPerMeter    = 0;
8 y8 I, ]8 E6 z, V+ u; j7 [ bi.biClrUsed       = 0;
+ w, l7 Y- ~  l+ O7 G bi.biClrImportant    = 0;6 {2 s+ Y1 B3 e- ^, j0 G
dwBmBitsSize = ((Bitmap.bmWidth *
) ^+ z4 n  z+ e( b  J5 n: q wBitCount+31)/32)* 4: B+ D8 X. q6 \% r, F2 b( P+ S6 ?
   *Bitmap.bmHeight ;/ x6 X9 ?% w1 R: @9 ?, _4 y+ K/ F
8 H7 i- ?' n5 R4 ^
//为位图内容分配内存
: N2 N/ X4 M, w. ~! E) r hDib  = GlobalAlloc(GHND,dwBmBitsSize+
7 V3 B9 ^5 U# x; B5 i dwPaletteSize+sizeof(BITMAPINFOHEADER));& G: K' W, q  W" Y) k: ]  o
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);2 n2 x# L# A" H
*lpbi = bi;
/ O& T1 P! s9 `9 H' h/ j# y- K  p0 A8 J# c3 m" L/ O
// 处理调色板 3 D- S! m, i# W+ s( s! k
hPal = GetStockObject(DEFAULT_PALETTE);2 E. s/ v9 M7 {* H
if (hPal)( P$ [: m- ?0 [5 @4 U0 E
{
4 S! l3 D4 s% g* t6 V7 F( M' c    hDC  = ::GetDC(NULL);8 f7 `0 E: O) C  |3 G
   hOldPal = SelectPalette(hDC, (HPALETTE)hPal, FALSE);* H/ b, H0 I% [7 V- o
   RealizePalette(hDC);
- r  `! S% m) g0 d' z" V5 T* e- X }7 G: i1 D& x8 E5 m

% A% A5 I% |8 l  // 获取该调色板下新的像素值- \+ E6 C$ d2 e
GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight,
; J9 T5 n; ]' N- t, ?4 ^* f) l' ~    (LPSTR)lpbi + sizeof(BITMAPINFOHEADER)+dwPaletteSize,- o# _2 B3 U3 H  ^2 Y/ f
   (LPBITMAPINFO)lpbi, DIB_RGB_COLORS);
/ h! u- Y. w6 J4 r2 P9 j
$ A) [+ d8 H/ J6 D6 G" L* k  //恢复调色板
! U4 k+ C# h/ } if (hOldPal)
$ _1 f0 i" Z5 ~+ ]9 H5 C {
9 q2 B% Y* O5 q/ W    SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);/ D5 F+ `; N3 v6 E8 ?  ^
   RealizePalette(hDC);# U3 w# e( S, l% A' S% a
   ::ReleaseDC(NULL, hDC);
, S) j: x! M3 ^8 M3 z }0 S2 M- F& L2 E- \* g
1 X+ n# `9 b) M: J  B( r
//创建位图文件
+ T( h. [6 ~( g% H% U fh = CreateFile(lpFileName, GENERIC_WRITE, ( r) U3 F2 u9 Q) e
      0, NULL, CREATE_ALWAYS,
( H( J+ }0 n( G9 K9 p7 W8 t/ }0 J1 o       FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
: y( Z; R1 _0 r/ w# V; [' r2 @ if (fh == INVALID_HANDLE_VALUE)
9 J. W' X- L5 s. H- s: H    return FALSE;, h0 x1 M  k& G9 A
8 X4 t* V: p; w
// 设置位图文件头
/ M- Y9 X- D3 v. C bmfHdr.bfType = 0x4D42;  // "BM"
" J8 w: b. K  @$ F0 q dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dwPaletteSize + dwBmBitsSize;
% O; f3 F: y5 U2 q8 V4 j bmfHdr.bfSize = dwDIBSize;9 [$ F( S5 C: L- h
bmfHdr.bfReserved1 = 0;
  n; P0 C" _# E- S! r/ D bmfHdr.bfReserved2 = 0;
) g) }% Q! }  M( \* A) \" ^$ J# L5 | bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) 0 f, B$ b7 g, B3 B7 L3 i* {
   + (DWORD)sizeof(BITMAPINFOHEADER)
9 w. W0 f" x" G; J/ L/ @! {7 [7 g    + dwPaletteSize;
; [# p+ m( u2 {- I* D  i1 Z( g( @9 E) ~, x* q8 s- R& j
/ U7 ?- A1 X* |5 v
// 写入位图文件头  e4 g+ q$ w& K. x$ w
WriteFile(fh, (LPSTR)&bmfHdr, sizeof
- D# O' q3 \/ ?9 v7 E (BITMAPFILEHEADER), &dwWritten, NULL);
  n; t- D/ _" b, |8 h
) G: J, L: Z7 E // 写入位图文件其余内容8 _' \- z6 D" P/ A
WriteFile(fh, (LPSTR)lpbi, dwDIBSize, 9 P" ]% E+ s& {  C* H4 W
&dwWritten, NULL);
. j" b* }; e; t5 u3 I! W8 s- g: g3 X
//消除内存分配
- a) K# \- T5 z! D# J0 X4 F  c9 ?- P GlobalUnlock(hDib);. b% w( @# J' I
GlobalFree(hDib);
* ^9 @+ Z1 H& T2 R% n  [/ E) J CloseHandle(fh);
; S2 T: q6 B' X, r( U$ I: E- R, b8 q( g$ E# W6 }; J5 [0 f1 R
return TRUE;" h# y" J3 v5 u; w& u
}8 M# I6 d' }2 L& j% Y& ]- q  n7 x
- Q. e& A0 d8 G1 D7 B3 ?" Y- Q  ]5 a

7 _) _5 K7 z% L  K20. 如何获取局域网上计算机名及它们的IP地址
) h" R; C# a4 V6 j& d/ S4 E& s8 j
l 连接ws2_32.lib和 mpr.lib库
  n+ B, j4 A4 y/ g- }* v8 U! t) }7 [& G, E% B2 |! O2 Y9 s
l #include winsock2.h
+ w+ U) {0 S/ N& u& }" U2 Q! M
2 G- G- N( c1 d0 ~" q2 B4 dCString strTemp;, r6 Q( }: l  l4 o. x
struct hostent *host;: X% n; L- Y5 D8 e3 \! F* s

8 o; U) D- G7 P' cstruct in_addr *ptr; // 检索IP地址
" s, e% a( t, _  a* wDWORD dwScope = RESOURCE_CONTEXT;
) e  w* f, R9 D3 F( I5 o/ fNETRESOURCE *NetResource = NULL;+ f- U! r' g! r; A. l& ^8 ?: m
HANDLE hEnum;( @  F$ W% O! H" n* n& `9 s: {2 f
WNetOpenEnum( dwScope, NULL, NULL, # D, |) B  S2 Z( i$ d& }
         NULL, &hEnum );
8 ^; z; w4 \& g# B2 W3 e2 R/ e8 [
WSADATA wsaData;
& G( o) K- J/ O$ jWSAStartup(MAKEWORD(1,1),&wsaData);
% [0 z. Q/ J$ z6 t' t* m* l+ {
+ I; f8 K6 `( H; [3 x! Tif ( hEnum )3 o# w6 x6 ^1 j; c
{
. |$ G7 j9 C3 {, r% t! J% g DWORD Count = 0xFFFFFFFF;
' l1 h& J: g! }& a1 n DWORD BufferSize = 2048;# I4 S, I7 W, F1 L- G7 z- x
LPVOID Buffer = new char[2048];
) P0 m# _+ v( K2 [7 Y WNetEnumResource( hEnum, &Count, 6 @$ W2 I: @& Q
      Buffer, &BufferSize );+ U# m% n" k/ \
NetResource = (NETRESOURCE*)Buffer;! e% m6 c2 E7 z9 W+ s
9 a9 O& ^, M/ p" {. O! c% q1 C3 w
char szHostName[200];$ m( Q: v$ K: f" F
unsigned int i;
3 `0 t# F, s6 k6 l* Q. C. J" m4 f( n( K
for ( i = 0;
; p! _$ o/ o4 l) W) Q       i < BufferSize/sizeof(NETRESOURCE); + Z8 ~, r. f$ U2 t1 _& u$ d
      i++, NetResource++ )* L7 `1 E! v* }2 T
{/ V9 S7 Y; l3 M( k: s6 g
      if ( NetResource->dwUsage == 8 K' W+ A) \5 u! w: @( M: N
         RESOURCEUSAGE_CONTAINER &&
* j! `/ u$ M! F' V          NetResource->dwType == 6 |8 _& O$ ?& o  S
         RESOURCETYPE_ANY )$ }4 F) M1 H6 C5 \5 V2 N
      {) H& e- U7 y2 N: |
         if ( NetResource->lpRemoteName )
7 u; r6 y: W: p& ]          {
3 C. w+ T2 [* N             CString strFullName =
+ I0 X8 Y" ]! Z8 b* q$ o                   NetResource->lpRemoteName;
8 Y% k6 z: n9 Q# R7 O  j             if ( 0 == 1 J1 j% z5 u. K
                  strFullName.Left(2).Compare("\\\\") )
% V$ f  S3 u+ D5 e! p' {: M                   strFullName = - e8 A4 c3 P9 i5 p& ~
                     strFullName.Right(
* \- P( \* i/ G! i- I: h  W( q                         strFullName.GetLength()-2);
8 N% w0 @" m# d5 b( }5 P
) i: n1 @+ ?, \: @/ {             gethostname( szHostName,
, C$ \& E0 K1 |! `* y  O                   strlen( szHostName ) );
1 Z7 d& ~0 ^# @3 O             host = gethostbyname(strFullName);2 j. n$ T8 \( ?" S" K) u" l; k) o! f

7 Q$ X# ~; C; \* j' H, ]+ j' D9 l% G             if(host == NULL) continue;
2 q! Y8 D* I! S" ?$ J             ptr = (struct in_addr *)
1 I7 p3 a2 t; W0 ?+ I8 u7 T                   host->h_addr_list[0];
) C/ }6 w" R) s+ q4 }$ E
& A6 n/ p$ N3 H' y) ?7 k1 h& s1 C             // =. 分隔开IP:211.40.35.76.          % K% r8 l0 i3 n
            int a = ptr->S_un.S_un_b.s_b1;  // 211          * i" U8 v8 q. Z4 |; J3 r
            int b = ptr->S_un.S_un_b.s_b2;  // 40' ~" S! d( @3 N9 s1 V# e
            int c = ptr->S_un.S_un_b.s_b3;  // 350 M2 v# j8 f0 `( {
            int d = ptr->S_un.S_un_b.s_b4;  // 763 E  R) r/ b& R% i
# \! K9 e8 d: X  ]6 g
            strTemp.Format("%s -->  %d.%d.%d.%d",
7 [% [* u& [& x2 B                   strFullName,a,b,c,d);
* T% m8 e. P4 V8 U9 ^4 u             AfxMessageBox(strTemp);+ s. a% z- g( T$ g  \+ i* p- j! J9 F
         }
7 c. o3 z+ t" s" q, z4 i! \       }* u* {1 f3 c: A5 n9 l
}
4 D7 l& k0 ]  K" b* m8 @1 c5 k  X7 O; ^' f- R
delete Buffer;
( @: d5 \- \6 @; R7 U/ T WNetCloseEnum( hEnum );
/ l. V$ I/ g2 e+ U1 H}
0 t. P  |+ V, ?3 E, @+ J& v
* [" N8 ~" X) OWSACleanup();

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