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;4 ?  P' N7 r, G0 z3 p
                  }
% I' r& ?8 \% w) i                ! [4 K4 f) p9 o  \% n2 F
                  // 修改位图 DirectBitmap3 d. {6 N7 X! `( F! Y& I- U' ^
                  SelectObject(DirectDC,PreviousObject);( U3 F5 C! v/ N

6 {+ w9 X( _( k6 _                   // 完成; r, E) l6 k! Q
                  RetBmp=DirectBitmap;
$ X" J& \  p  B( X5 i& ~             }8 ~. _( }9 c6 N1 H' G* D
            // 释放DC; L$ t! P/ I# n
            DeleteDC(DirectDC);- d: f# v" J2 f
         }
! w  Y# O" L! e1 G          // 释放DC
' }" [/ [* `& S1 w7 R3 Q          DeleteDC(BufferDC);
' {- t% c2 ~( E       }
/ N0 h. c( \% {* e }' H2 q3 V% @5 f9 o: S, |- \' R+ T
return RetBmp;! X$ r6 \+ y* k' {' @8 \* T- d
}
& }" g+ f' j7 }# f0 R- X( s) Q' [' Z. Z6 i. g" ~) v  \  ~2 r  u

( w' {/ V' t7 @8 v用法：& {3 z7 h3 I4 `; c6 a) f

* f4 O) T' F9 x+ O3 K0 f) K6 oHBITMAP hBmp2 = LoadBitmap(g_hinstance,MAKEINTRESOURCE(IDB_SAMPLEBITMAP));1 m5 i$ B$ I4 W
HBITMAP hBmp = ReplaceColor(hBmp2,0xff0000,0x00ff00); // 替换蓝色为绿色2 c/ R6 }! ~, a1 H
......
' e+ V! U& l5 D
6 \# i9 F& x# m+ {) KDeleteObject(hBmp2);
& C- ~6 b' k2 M; x6 k9 J% j& xDeleteObject(hBmp);: Q5 s: x( p$ D% _

5 L  e- U  I* i# r6 P$ |. z8 S% J( ]/ J3 f
19. 如何转换并保存位图. {" o& _2 o0 ~. ]1 j

, C6 M; r2 v9 b& h% M//********************************************************************************
1 u/ \+ I$ N: H- S- O: D  d//* 名称：DDBToDIB. R& k' b( V" C2 J: }# ?
//* 作者：徐景周(jingzhou_xu@163.net)
0 s3 d( U" r9 W' e//* 功能：设备相关转换为设备无关位图
, {5 Y( F8 j. s//********************************************************************************0 T3 J3 _1 l" n
0 f  m' |) C3 H+ ^1 m9 D8 f
HANDLE CScreenSnapDlg::DDBToDIB( CBitmap& bitmap, DWORD dwCompression /* = BI_RGB */) 6 z% M0 D2 N  b
{& b( z% k6 ~# R+ E
BITMAP             bm;% Q4 o6 B% L7 M& h
BITMAPINFOHEADER bi;' {$ I! n) v/ ]: k: u6 N6 @
LPBITMAPINFOHEADER  lpbi;
* c% a1 {0 l3 V5 f DWORD             dwLen;
1 F. g( `- W9 e: \  H* e HANDLE             hDIB;
/ d. X, J, j# F7 Q HANDLE             handle;8 m7 Y" n$ J" K. W3 T* P" l
HDC                   hDC;3 R7 R9 R% z" K- ]1 O- a
HPALETTE          hPal;1 X- E* A7 _6 y9 [3 \

; ?# W, L3 o0 I/ G8 b; _ CWindowDC          dc( this );
) j) k' h: d9 l( r& t( o( d CPalette          pal;9 S/ J( Z: `0 z0 s3 s
//如果支持调色板的话，则建立它
$ r% \3 m0 ~2 S# J6 r if( dc.GetDeviceCaps( RASTERCAPS ) & RC_PALETTE )
8 @' ]; ~4 S+ e$ T, s6 p {8 I" ^& W* f0 \  u) G: D2 `
      UINT       nSize = sizeof(LOGPALETTE) + ( sizeof(PALETTEENTRY) * 256 );
- l  e' r2 b( V3 ^5 e  C       LOGPALETTE* pLP    = (LOGPALETTE*)new BYTE[nSize];
- c0 A& Z/ e; D. d7 ^6 @       pLP->palVersion    = 0x300;; M+ X0 P1 ]( t3 S. @
      pLP->palNumEntries = (unsigned short)GetSystemPaletteEntries( dc, 0, 255, & `& @/ ]3 z. J/ M" X
      pLP->palPalEntry );2 r* E* I- }! _8 ]

$ ^# C# J+ f$ w( `  z% |6 W4 M: j       pal.CreatePalette( pLP );9 m; E* I3 R0 Q# K5 ?
1 f4 p/ I2 g0 S& z* u
      //释放
) Z4 _( r  v! R3 {) M% ^0 a       delete[] pLP;0 L6 C. ?1 B8 ?& o- v- g! `
}
' R1 }8 U+ b) G5 B: b/ z& M9 U: _+ z2 [9 ]( S! P6 O4 s/ G
ASSERT( bitmap.GetSafeHandle() );
. {4 p1 u* ^( V' }
# X  @8 n" \% y6 S( A! n) z) O  i0 e$ r' Y* v5 Y$ V. j
//不支持BI_BITFIELDS类型9 D8 R, o) g! q  @
if( dwCompression == BI_BITFIELDS )2 |, P' v3 A8 P/ d3 d
      return NULL;+ w# H+ C/ F+ J

% O5 I; u3 Z2 r //如果调色板为空，则用默认调色板
  c" L) c. s0 @% X+ [ hPal = (HPALETTE) pal.GetSafeHandle();$ q9 L! X2 F/ @5 ]6 i& @; C3 r
if (hPal==NULL)
8 b. ?9 h5 r9 T$ b, l: ^       hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE);
1 b  D, m: K4 Y6 _
- q- }7 v, ?" }- s5 m+ t //获取位图信息; s. [7 g* H5 ]( d
bitmap.GetObject(sizeof(bm),(LPSTR)&bm);: x& [, ^2 E  T. }) n
0 Z4 h' e( W' \4 Y0 Y5 l6 W
//初始化位图信息头% r# u: V9 Q# u7 V/ a' K' S
bi.biSize       = sizeof(BITMAPINFOHEADER);
6 ?3 k9 b7 e! }/ b0 I) g9 ` bi.biWidth       = bm.bmWidth;
4 a! D5 }( Q1 c; S6 l) v' I, X bi.biHeight       = bm.bmHeight;
4 a3 A" c" j+ k% T7 m bi.biPlanes       = 1;
. F! X9 s7 B) q/ j/ D+ ~ bi.biBitCount       = (unsigned short)(bm.bmPlanes * bm.bmBitsPixel) ;
% z/ f" d, F& B" D7 f0 ]- G bi.biCompression = dwCompression;# S2 ]: @# o* f1 q) F
bi.biSizeImage       = 0;
& X& L& G  c5 ]/ C bi.biXPelsPerMeter = 0;2 }% ~& Q. k% \( p
bi.biYPelsPerMeter = 0;6 n7 o& H/ M8 `$ Z6 k! }
bi.biClrUsed       = 0;
& C5 P" o& \( u( q# A bi.biClrImportant = 0;( B; B- C9 d) e8 p- c- a
9 s9 [9 z- B" D% S4 K
//计算信息头及颜色表大小
+ W0 C5 u- Z0 k( ^6 A9 v int nColors = 0;
+ {+ h9 V5 Q" V% b" r" H if(bi.biBitCount <= 8). p6 W% p; u% R0 n
      {4 z% w9 h8 b4 i& e" x5 U7 H% t
      nColors = (1 << bi.biBitCount);
3 A4 |# l4 T& b       }& u# x) i; R9 k' v
dwLen  = bi.biSize + nColors * sizeof(RGBQUAD);
$ o+ J/ v- `9 v& _. H/ i3 s5 }6 e) u% ^6 p. n
hDC = ::GetDC(NULL);
  g' n+ l- c* m3 j3 r8 e9 x hPal = SelectPalette(hDC,hPal,FALSE);8 p) U  x1 y4 w: ]6 E
RealizePalette(hDC);
7 X1 P( l" S: f2 g. c! ]2 F$ E4 D% O- D3 ^1 P
//为信息头及颜色表分配内存
6 m. V. X- \( B5 ^2 D2 V hDIB = GlobalAlloc(GMEM_FIXED,dwLen);
' e1 i- X6 h( |# _ if (!hDIB){
, [/ Z0 p8 D2 c+ |8 f/ n       SelectPalette(hDC,hPal,FALSE);  ?; F( s. J: d+ C; J
      ::ReleaseDC(NULL,hDC);
/ U& d1 h2 {- W$ C- Z8 A       return NULL;
8 @$ Q9 @6 g# E1 e }
% X8 }2 a' _5 A# O/ r3 Q0 T& J+ M" d1 ]1 G$ I$ m6 q. m
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);4 y5 D, _! |, H+ V) G
*lpbi = bi;% s1 d* _6 T, U. S
1 u2 `8 a8 C- N7 A
//调用 GetDIBits 计算图像大小; y! N7 ~% f$ t9 F/ K4 I* S% {5 p
GetDIBits(hDC, (HBITMAP)bitmap.GetSafeHandle(), 0L, (DWORD)bi.biHeight,- g6 [! g* b' X4 Y, Z
         (LPBYTE)NULL, (LPBITMAPINFO)lpbi, (DWORD)DIB_RGB_COLORS);$ \2 G3 I" d+ H. T7 u7 U( n% E8 _

3 E, }/ z* m! y' v. C* f bi = *lpbi;! u0 m: K5 J$ d4 i( T

0 i" \' L& w+ N1 H/ L //图像的每一行都对齐(32bit)边界: m. M1 M: n5 M3 L: \
if (bi.biSizeImage == 0){9 h  Y. R! a5 I3 ^4 }4 V) @( x
      bi.biSizeImage = ((((bi.biWidth * bi.biBitCount) + 31) & ~31) / 8) % v0 c4 j: v9 s, K) ?
                     * bi.biHeight;$ ?' N: x- Q# {" ^1 [% r( l( h
      if (dwCompression != BI_RGB)
- _8 H4 {3 r' {. F          bi.biSizeImage = (bi.biSizeImage * 3) / 2;
4 |- y2 ]$ F" {/ K }
& H. F0 p, E" U" y //重新分配内存大小，以便放下所有数据: F2 O, C6 @$ t8 g. ^7 Y
dwLen += bi.biSizeImage;8 p* I! a8 y) }) M8 l# {
handle = GlobalReAlloc(hDIB, dwLen, GMEM_MOVEABLE) ;4 \* b) U1 m3 F0 E" i
if (handle != NULL)+ v6 L, z( w1 @+ N" a$ X7 r
      hDIB = handle;5 H% o/ o3 w1 M' j5 p" s% b' I! L
else
( J; ^5 x  e9 F. a       {! g& m! Z' H5 \* y) T( h
      GlobalFree(hDIB);1 O0 h+ ^0 R+ T- t+ X1 P! n) x5 Z; ]
* i- a% j3 n) K* P. t/ ~/ \# A
      //重选原始调色板9 M9 J% ?( f5 ]9 `2 b
      SelectPalette(hDC,hPal,FALSE);9 K) a' M4 M  M5 `
      ::ReleaseDC(NULL,hDC);3 U$ k; L- b4 J2 V
      return NULL;) O; G: f5 A2 L" c, h
      }: V/ c6 t& g, e4 i7 M1 S2 [
//获取位图数据" m# }+ y6 o% O! s$ Q5 R
lpbi = (LPBITMAPINFOHEADER)hDIB;# T2 d; r- V5 C) N0 j) f+ j& J
//最终获得的DIB
: H' z& S3 A9 Q; \, G: m4 Z$ P BOOL bGotBits = GetDIBits( hDC, (HBITMAP)bitmap.GetSafeHandle(),
+ A# t' W  V2 n, a% N             0L,                   //扫描行起始处5 g; A5 d2 P3 `. L" _1 X& |
            (DWORD)bi.biHeight,    //扫描行数- l) x$ X4 O/ ^2 d" E9 T& C
            (LPBYTE)lpbi          //位图数据地址% e- U3 K6 K* F, n! R4 L3 O
            + (bi.biSize + nColors * sizeof(RGBQUAD)),
8 p6 C$ h5 D# A1 j             (LPBITMAPINFO)lpbi,    //位图信息地址  A3 L  D6 }% |
            (DWORD)DIB_RGB_COLORS);  //颜色板使用RGB2 H0 i* `, Z8 T3 g& d/ W( Z/ {
if( !bGotBits )
. a7 g. @6 k5 K$ G% G  E' Q& @6 j {  U( p  C) f' }# k4 r: p
      GlobalFree(hDIB);
' k1 E! q( W) Y$ C+ ]. Z6 u       SelectPalette(hDC,hPal,FALSE);# ]  b/ c- k* i  u9 k
      ::ReleaseDC(NULL,hDC);  a- w+ N" {2 @( ^2 k
      return NULL;. n  t. C9 O. y
}
) R$ @6 a4 [9 i2 j2 X9 B1 } SelectPalette(hDC,hPal,FALSE);
, {9 [- I4 Q! ^" o% x% `7 V ::ReleaseDC(NULL,hDC);
. m% ?; f9 T& q/ o. B# F return hDIB;
2 H! Q) w& O  m* D; \( A}  s1 k4 S3 C" s# t5 i  y

. C- G0 m5 h8 J1 ~8 C7 d2 d, F# t% n8 z, M
//********************************************************************************, ?9 T, h' Y: {5 ^/ u4 J7 V
//* 名称：SaveBitmapToFile
# m- }- @8 B8 n8 e. i/ T- M//* 修改：徐景周(jingzhou_xu@163.net)
5 l, K. ~) V) t9 e# B5 m//* 功能：保存为位图文件
3 H% p/ p; _- J; }- t//********************************************************************************
1 E9 Y- F6 v- z9 PBOOL CScreenSnapDlg::SaveBitmapToFile(HBITMAP hBitmap , CString lpFileName)
4 I$ H1 B& r5 S4 [" J{
$ ^4 Q# Y: [9 R# { HDC             hDC;                         //设备描述表  ( i9 P9 W2 P8 o  Y. P
int             iBits;                         //当前显示分辨率下每个像素所占字节数. r/ j0 n  ]1 y9 y3 w
WORD          wBitCount;                      //位图中每个像素所占字节数/ }4 a, J& F- V! l8 C5 G
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' E, k; Q3 Z' ?( N/ N; ~, l
                  dwBmBitsSize,, d0 x6 D. u$ d/ G* |$ g
                  dwDIBSize, dwWritten;% i* m' R  O1 ?9 R$ B1 d; v
BITMAP       Bitmap;       ' ?2 a9 A% G( {" C/ @4 j  J
BITMAPFILEHEADER bmfHdr;                      //位图属性结构 ; n- P1 ^- p5 U
BITMAPINFOHEADER bi;                         //位图文件头结构
# K9 ]) C) k, v9 c* u4 a LPBITMAPINFOHEADER lpbi;                      //位图信息头结构
1 v9 H7 q( t5 Y2 M. B  m) A. y' i$ v
8 w- D" ^$ i: Q5 N" V+ b" ?# A( J 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! `- d2 q6 }9 Z! ?6 h0 ~
8 N( U4 e3 {# o8 m, t

8 a9 E  z; E, O- O2 | //计算位图文件每个像素所占字节数) g2 N5 {* @3 x- t2 M
hDC = CreateDC("DISPLAY",NULL,NULL,NULL);
0 Q* t! X5 }7 v, L& `( L iBits = GetDeviceCaps(hDC, BITSPIXEL) * . A) `1 f  ?4 X& C
GetDeviceCaps(hDC, PLANES);6 W, Y2 y! I$ k5 W+ K
DeleteDC(hDC);# [' q" _, ^) d1 X. D6 }5 w& E
if (iBits <= 1)
, `. k: C  x4 I! Z: r9 P0 A) c% B    wBitCount = 1;
) o$ g) F9 {9 Y6 G else if (iBits <= 4)
% s/ @! @1 [2 J- I3 r# ?    wBitCount = 4;6 W1 `$ F' E, Z; D% K
else if (iBits <= 8)
/ a& _% {% \, s; l    wBitCount = 8;' U( S$ L9 e3 D" d
else if (iBits <= 24)
- F) q  |8 D1 P) G6 a( q0 I% {    wBitCount = 24;" J( C9 l4 @* y/ V: W2 `
1 x8 t0 r$ q# G& L4 ]1 w
//计算调色板大小
# N1 j0 S7 Q8 ~2 L if (wBitCount <= 8)$ L% A! j+ T9 V0 }3 q/ \( @- e! z
   dwPaletteSize = (1 << wBitCount) *sizeof(RGBQUAD);" `) P' n; v* E2 P
" ^5 s" J( s# \, R( r1 j
//设置位图信息头结构
5 W% z' k1 ?; v  a GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
9 o8 U. U2 g( _% t6 t( v/ w( C bi.biSize          = sizeof(BITMAPINFOHEADER);
4 ^8 s2 M% T, g, r6 L bi.biWidth          = Bitmap.bmWidth;7 b7 K7 h9 f) P1 A1 B, v: _( M
bi.biHeight       = Bitmap.bmHeight;* M5 ?* d3 R0 q+ Z9 B4 q
bi.biPlanes       = 1;3 C& F6 q6 I+ r* f+ t2 h
bi.biBitCount       = wBitCount;7 N' p4 L. z0 ~3 t& a! Y
bi.biCompression    = BI_RGB;
# z5 f) }' Y$ r7 B. b3 e bi.biSizeImage       = 0;: J7 L3 b1 J  D# [  t" T0 k- S% J
bi.biXPelsPerMeter    = 0;' ~$ d5 S0 n! s9 a. R
bi.biYPelsPerMeter    = 0;8 _. n; |. w& S2 J: k7 c* {
bi.biClrUsed       = 0;
9 L  w! r  R+ l bi.biClrImportant    = 0;* _" W# O, l/ g) p- R
dwBmBitsSize = ((Bitmap.bmWidth ** c3 ]0 E1 N: j: r6 ~; u1 |
wBitCount+31)/32)* 4
8 q3 s* |% f" z/ W6 ]    *Bitmap.bmHeight ;8 d' v" y6 l0 f7 c
! o, w) _  H" _$ w: I
//为位图内容分配内存, }) Z* x- p% f3 z) o
hDib  = GlobalAlloc(GHND,dwBmBitsSize+
5 ^% K$ A' i# O1 }- q dwPaletteSize+sizeof(BITMAPINFOHEADER));3 E5 T- P% T$ q) f, t
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);3 w: j: g" C( j2 ]7 H# d0 V
*lpbi = bi;# F0 `3 a, X1 z8 V; u+ \( t

1 x7 g" F8 [+ }. p: p // 处理调色板
, t4 N4 ?) p8 X hPal = GetStockObject(DEFAULT_PALETTE);
+ T# f2 \; K# W6 A0 G( O5 R5 e if (hPal)
, ]2 K6 n/ O% x1 ?8 i+ V* ~8 c {
3 d/ e( u3 h1 z( o! [  t1 v    hDC  = ::GetDC(NULL);
; E6 g8 ?8 d) q4 t* f8 b    hOldPal = SelectPalette(hDC, (HPALETTE)hPal, FALSE);2 S/ U( B$ d) G
   RealizePalette(hDC);
! |# Z/ S/ r* H, `9 g) l4 G }
5 f% ?9 T; K# Z' p% v* i5 ~+ I4 s! p3 ^4 N/ v
  // 获取该调色板下新的像素值$ c. z. v. ^2 d9 u2 ^8 ^3 z! E* e
GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight,% h. j- k3 r* q* ]
   (LPSTR)lpbi + sizeof(BITMAPINFOHEADER)+dwPaletteSize,
& c; q$ v! ^6 w. z) E- `" r    (LPBITMAPINFO)lpbi, DIB_RGB_COLORS);
! T; i3 M' n" o, H3 E  J7 A/ a  c" {+ w& K8 c3 y
  //恢复调色板 5 [7 D- E" ]: z7 z! e
if (hOldPal)# m% o! r% B* |% T+ e4 x  I, W2 K
{
( X$ ?; k9 g2 r* Z% m    SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);3 |* X* G/ a8 {3 ^# D
   RealizePalette(hDC);) k4 ]5 V3 @1 y9 {- d3 N+ f3 Z; D; Q
   ::ReleaseDC(NULL, hDC);
& Z" ?1 L, q5 a4 e }# }2 B; O! _3 ?# k) o) P. Y

6 z' B+ l" u4 V7 E( L+ B; x, H //创建位图文件 ; S+ [, o2 t" @6 Q/ q1 s3 R( A# y
fh = CreateFile(lpFileName, GENERIC_WRITE, 3 ?0 E! U& \& t, q9 e% @
      0, NULL, CREATE_ALWAYS,
+ E6 p5 j: J3 x, {6 w       FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);. ^: h: t7 r; \
if (fh == INVALID_HANDLE_VALUE)2 [6 N" ]! Z: z/ H
   return FALSE;
3 w  I  `' ?$ Y! C& H+ w4 N" b5 h+ \- C' W- n+ L
// 设置位图文件头, }+ T5 a  b$ e$ [* a  \
bmfHdr.bfType = 0x4D42;  // "BM"* e( A2 u+ G) S, c9 l
dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dwPaletteSize + dwBmBitsSize;
$ B! n; k2 k/ G$ ~# w/ [6 r bmfHdr.bfSize = dwDIBSize;3 X- ~' J8 A% g! |1 ?* p
bmfHdr.bfReserved1 = 0;
" w$ e  K/ c2 D; X. D) K bmfHdr.bfReserved2 = 0;
, ]( U! u7 r6 ^2 ~* ^: c7 z bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) % c+ F& R; K  Z* W
   + (DWORD)sizeof(BITMAPINFOHEADER): A5 a5 a1 E4 c  Q) Q6 J% n
   + dwPaletteSize;- A5 x: x& W; P6 F% [' Y
* E+ l; v( ]) v9 _

; M5 R. H7 {( Q // 写入位图文件头
) x8 h5 S) A+ ]2 o) ~ WriteFile(fh, (LPSTR)&bmfHdr, sizeof
! y5 T* I/ Q. i! n7 _8 l" K (BITMAPFILEHEADER), &dwWritten, NULL);
$ z! `4 f' i/ o3 v  z& ^
/ }; E+ R& U  o3 U // 写入位图文件其余内容
/ J7 M! f+ ?8 v6 R; a3 N( k WriteFile(fh, (LPSTR)lpbi, dwDIBSize,
: w# E/ e. `, S# K &dwWritten, NULL);
  M) G- ?) q7 C- a$ O, x
4 H% W4 k; f8 Z- |" _  S8 \7 j //消除内存分配  : H. V$ a7 r9 X6 e; \
GlobalUnlock(hDib);
3 a3 p7 E+ e  Q4 ~4 [) G GlobalFree(hDib);
" \3 r0 g* |* B1 V$ p CloseHandle(fh);# N; C2 i: X* w/ p
/ _* |1 D3 u! p1 r" U9 v. n
return TRUE;0 K* [0 p( X$ h6 S& @  r
}
1 I1 K' ?9 G; X! r4 X
2 G3 w$ @5 X- s4 l# X
/ ]* F8 l) D8 C/ f! s0 P" G* j20. 如何获取局域网上计算机名及它们的IP地址
% f0 P$ ~' R* \9 W) k
, t# G4 O, J  f& f1 rl 连接ws2_32.lib和 mpr.lib库* r! f% M: U2 c1 o

' |& s$ k% @, F: z8 ~l #include winsock2.h
2 a8 h1 X. }" f; \) B! S
5 N# ^9 t: J) w. H( UCString strTemp;/ S4 e( L1 E/ P6 Y
struct hostent *host;
5 [+ s& z2 Z8 G  i0 ~0 n5 T( s
, S: S' x0 Q- q. {- ]# }& b) D; |struct in_addr *ptr; // 检索IP地址
  m- s1 z# o2 M, w5 s8 DDWORD dwScope = RESOURCE_CONTEXT;* C: C0 a+ y" k3 k  g6 u2 w
NETRESOURCE *NetResource = NULL;
8 G- c/ }5 i1 Z! NHANDLE hEnum;/ ^: M4 v: z! r& \$ O; M) T
WNetOpenEnum( dwScope, NULL, NULL, - v9 k4 @* G& d
         NULL, &hEnum );$ M* p7 K3 T$ L* {# _7 n9 o3 |" a

+ G  `" N) p) PWSADATA wsaData;
4 Q. y) k# g$ `3 ]$ PWSAStartup(MAKEWORD(1,1),&wsaData);! B: E0 K0 c# Z5 t, G. F8 u

( @; n. @  J( u- u& aif ( hEnum )6 w4 o* [0 Z2 F( |$ U/ W/ c
{( w1 n" a+ ]) Y3 k. ^; {% N
DWORD Count = 0xFFFFFFFF;* b# u, q9 L1 J2 J$ W3 m) M7 t4 J
DWORD BufferSize = 2048;
. j% s/ U1 `( D8 i% S LPVOID Buffer = new char[2048];9 @! `8 b9 s5 b$ @9 k7 p: p0 P
WNetEnumResource( hEnum, &Count,
7 f3 T3 r  M  e2 {3 t       Buffer, &BufferSize );# ]+ f& N& k1 N* e
NetResource = (NETRESOURCE*)Buffer;
$ X' f& C; l9 i. W: V- c1 {1 i: J8 Q. d$ ]: E2 E; Q7 v
char szHostName[200];' N% @+ l, l* f4 V
unsigned int i;( P0 A, `* ]2 W
. I; o; }& t2 n: C) H
for ( i = 0;
/ v3 |0 F# a; l. I: e; n       i < BufferSize/sizeof(NETRESOURCE);
. b+ l( }9 u0 a1 l9 w3 X       i++, NetResource++ ). r( O! ]* w$ c. F! T
{
3 m( X# Y$ P4 H$ j- k       if ( NetResource->dwUsage ==
7 b# q$ Y- e9 T9 g/ }7 ^          RESOURCEUSAGE_CONTAINER &&
  ^& R. g& c9 [8 R: |( T' U% u+ ^          NetResource->dwType ==
/ c- o7 F: \% F1 ~6 x, [          RESOURCETYPE_ANY )
! M( D& c$ d* O9 t       {
% e) X7 ^2 a5 R' ]          if ( NetResource->lpRemoteName )
* b6 W  C/ [  O6 @4 M) a          {, V# B1 M0 c8 G2 n+ `
            CString strFullName =
$ Y* }* i# j- Q  d                   NetResource->lpRemoteName;' @# f* R8 q4 L) a  T
            if ( 0 == 5 ~9 r: b, t% i* t
                  strFullName.Left(2).Compare("\\\\") ) " }, y5 D" s7 k- ^
                  strFullName = 5 R  [- w. q2 m- [. Z
                     strFullName.Right(/ T" y7 C. n. }$ ^) S) ~
                        strFullName.GetLength()-2);. r5 ]  J' A& R
7 D" s, X+ R0 y$ V; J
            gethostname( szHostName,
7 [" N+ p3 C) c5 T+ Y& f, L                   strlen( szHostName ) );
3 h" S8 X. m3 N+ b  f             host = gethostbyname(strFullName);2 K5 q- _  C! b% j& ]- I

2 J7 ~8 Y& w3 m4 I3 f) c             if(host == NULL) continue;
6 \9 {) c6 \* [  N             ptr = (struct in_addr *)
1 s/ d" t) P1 t3 L6 @/ W" Y                   host->h_addr_list[0];
8 D, I) ~8 W; M" ?- D& X: I* n, ^5 t( [5 O" G# e. O5 o1 ^
            // =. 分隔开IP:211.40.35.76.          ) W& W' S$ b8 Y) Q' A; r
            int a = ptr->S_un.S_un_b.s_b1;  // 211          " a, E5 s# m3 k& {4 M
            int b = ptr->S_un.S_un_b.s_b2;  // 401 S$ c- E; f+ H" p1 a+ [" |& n
            int c = ptr->S_un.S_un_b.s_b3;  // 35
8 ^, }: I* r2 q9 X9 J& E, a8 J             int d = ptr->S_un.S_un_b.s_b4;  // 76
3 f+ K# t% S+ K- U& ~6 I; f3 }6 ]5 M9 x2 _& u
            strTemp.Format("%s -->  %d.%d.%d.%d",
! d6 L4 r. I& m/ }3 K                   strFullName,a,b,c,d);
# ?4 N; T2 P& M/ C% j5 g$ [+ m% A             AfxMessageBox(strTemp);; H9 q; a: T) O) W" U6 R1 `
         }. k3 e7 E! K$ ^3 w
      }- ]: `2 x+ a6 _1 ]6 C( b8 J! e4 ~
}
) g# _9 G& l) o% I  h6 P+ A; W! k" q! P+ N  K9 w% f
delete Buffer;
3 r2 g2 Q" d" I! A: S$ f! @* n7 s WNetCloseEnum( hEnum ); * D. e3 l( d& N  z" k# [
}
! y( I) G& B. h
# Z  P' _+ i  d" K/ e1 n& }WSACleanup();

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