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;' ]$ l8 ^1 x! b2 H. ^& `9 E
                  }6 t$ p+ D& c; k

: ]; Y. u! l( U$ w* t                   // 修改位图 DirectBitmap4 H* d6 k4 q% m  s1 k5 l; D) z
                  SelectObject(DirectDC,PreviousObject);3 G# ~2 f. ^& x( f* L

6 a2 }9 p+ \0 X  E                   // 完成$ H& a+ F" N9 b0 \+ X5 [* m
                  RetBmp=DirectBitmap;, D) d5 u# j. ^
            }
& w$ j# A8 R& s6 Z) N1 O& S4 n. k             // 释放DC
6 K) [& V: A9 [8 W5 d             DeleteDC(DirectDC);1 F. ?8 d9 A2 ~3 Z) ]
         }, w  S9 n& a7 `! {
         // 释放DC
' P5 N8 L5 H& P0 B! @, d& r' d, {          DeleteDC(BufferDC);
' F6 K, e* n# P- k/ J& G       }9 I1 o! B1 N  }
}3 \9 E( q" f+ t& l2 o
return RetBmp;
1 _# U, M; J( N" g. V" s5 t}' T% I$ b3 ?) x3 F

9 T- u! C2 x9 x# r+ D2 }0 ]: H) x. {; k# L
用法：
( P+ y7 U, j5 P& g/ |" B
/ [9 I1 U( W5 T  f% HHBITMAP hBmp2 = LoadBitmap(g_hinstance,MAKEINTRESOURCE(IDB_SAMPLEBITMAP));
& Q" q1 r3 Z" t) zHBITMAP hBmp = ReplaceColor(hBmp2,0xff0000,0x00ff00); // 替换蓝色为绿色6 k! S. v5 U  e6 j3 R) ?; Q
......7 z3 J, @+ l( s$ B. l
3 S9 |1 v0 q1 _( T" l
DeleteObject(hBmp2);
, Q9 {( m# U% g& MDeleteObject(hBmp);
) U0 q  k1 {) |& n# t+ z3 I2 H( W0 @9 A' F5 v

: W1 [- g; ]- a: X/ f  D& c19. 如何转换并保存位图
9 c/ q1 ~4 r+ o. z
" Q6 l1 E, ^2 R" f0 h8 }) I+ ]//********************************************************************************
: d/ K4 q1 k* B3 R//* 名称：DDBToDIB
1 h3 ~) T: e$ d2 w' Y//* 作者：徐景周(jingzhou_xu@163.net)- Q! C: S% A- t  n2 i/ U
//* 功能：设备相关转换为设备无关位图# U3 D! s' A+ C! I
//********************************************************************************& L! F3 l/ z% n1 B
" c' ~1 d# t1 m6 W3 @' f3 r% k/ |- J
HANDLE CScreenSnapDlg::DDBToDIB( CBitmap& bitmap, DWORD dwCompression /* = BI_RGB */)
/ E3 d. m9 f  l4 p% `{( F: b0 ^* X% F; C. @
BITMAP             bm;
# G( [1 ]1 d8 v BITMAPINFOHEADER bi;
9 U0 f; \8 z  T+ R. n LPBITMAPINFOHEADER  lpbi;; \1 v/ V; d7 Z& @# }( R
DWORD             dwLen;( O3 m  _* \4 t- x# ~% o
HANDLE             hDIB;1 ?$ k" r4 B& E* X% l
HANDLE             handle;
5 h6 G7 q3 h4 i! O HDC                   hDC;/ D' s$ r2 Q0 Q. V
HPALETTE          hPal;0 Q! U( |$ O, @( q+ b1 Z
# q, J  g* |& x
CWindowDC          dc( this );1 E+ ?+ @- l: P" R2 T5 ?/ _
CPalette          pal;- F- `  f. G, {, K
//如果支持调色板的话，则建立它: J: `+ V3 n1 }, I; {/ r9 J
if( dc.GetDeviceCaps( RASTERCAPS ) & RC_PALETTE )
0 t# t2 b: j" M9 G4 }% E! n {/ P2 O& ?6 v2 \6 H
      UINT       nSize = sizeof(LOGPALETTE) + ( sizeof(PALETTEENTRY) * 256 );
7 k* F7 k, t; b; H% ]0 G       LOGPALETTE* pLP    = (LOGPALETTE*)new BYTE[nSize];
) k- {: k+ w. s' J$ d       pLP->palVersion    = 0x300;! l6 x' D) S( b8 S! \
      pLP->palNumEntries = (unsigned short)GetSystemPaletteEntries( dc, 0, 255, 5 Y9 L+ ]( {1 t, o
      pLP->palPalEntry );1 L% h# \; a6 W. y

# `& m9 a' I# d! V: X2 J       pal.CreatePalette( pLP );
$ p* d1 K0 z; E! C* |2 Y7 {4 t5 q9 k# j/ d
      //释放, {6 U/ M3 y0 ?# K
      delete[] pLP;
. o+ V  M: j8 s7 c }# b/ n7 a' d/ E" m8 c6 Y8 n1 M

- S3 ]- v- ~# L, @0 X+ | ASSERT( bitmap.GetSafeHandle() );
% L$ C: T  G) u4 F9 m8 D7 a; t
% r: y+ T6 T7 A* Y
- Z/ ]: A  t  B9 G0 {! o: r$ K //不支持BI_BITFIELDS类型
/ r$ x$ O+ Z: s) N- [ if( dwCompression == BI_BITFIELDS )
2 |2 @4 J& d0 y! y       return NULL;& O  X' @" M* i/ o
$ h0 ?0 j7 q/ ^5 i
//如果调色板为空，则用默认调色板/ {/ r* V! a! Y7 a+ U. R) b
hPal = (HPALETTE) pal.GetSafeHandle();4 L7 e% l: |( o! L% S
if (hPal==NULL)8 s9 T8 |& J) J' ?
      hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE);% Z$ y% ]; ?$ _4 F1 K0 l9 U
3 j- ]0 b! ^; c2 }5 k
//获取位图信息6 @8 S# ]. _4 v0 W/ r! L% O: s
bitmap.GetObject(sizeof(bm),(LPSTR)&bm);
- y: J3 M4 L4 Q% j( r( L, P$ ]
6 V; v; B9 ?1 I9 E2 @) b //初始化位图信息头7 I0 h/ X& k1 L5 I- u. I9 w5 G; I% J
bi.biSize       = sizeof(BITMAPINFOHEADER);' z  F% M; ]$ T0 U/ J; P
bi.biWidth       = bm.bmWidth;
: c5 ~$ A' I0 q% F. L: ] bi.biHeight       = bm.bmHeight;
( [1 b4 \1 L% R( h2 S6 H  d- p% o bi.biPlanes       = 1;4 U1 k- A6 |: \) ?
bi.biBitCount       = (unsigned short)(bm.bmPlanes * bm.bmBitsPixel) ;
# I' ~% B/ r' E3 {! P% i% O; J bi.biCompression = dwCompression;
2 e- P+ i# i1 z bi.biSizeImage       = 0;4 o% l' G/ b$ f2 n6 X: }
bi.biXPelsPerMeter = 0;
1 |- i  o+ h7 h3 w) L$ M8 ?3 E bi.biYPelsPerMeter = 0;
6 h( s. z$ J( K* H% q bi.biClrUsed       = 0;2 Q& Y( C. x( d2 r3 ]$ \8 v
bi.biClrImportant = 0;8 N5 v* d- Z1 K1 ]5 u8 O
1 i- t" M/ D4 Y- E7 l! c$ C
//计算信息头及颜色表大小# ^, T: p3 ~' D
int nColors = 0;9 `. |3 f5 U5 d3 H+ H, T3 j
if(bi.biBitCount <= 8)$ J% U3 e7 @) t! Q' n0 s, f5 p
      {" c+ l( v% N8 p( S& w: H4 X+ f, ?) T
      nColors = (1 << bi.biBitCount);' |) r. a2 \9 g( o+ L
      }
) {( E1 b# D4 g5 h9 L  A% Q  @ dwLen  = bi.biSize + nColors * sizeof(RGBQUAD);
9 d% q, o: K' V: Z6 @: d) x) l" J3 {' z4 U# {% a: p
hDC = ::GetDC(NULL);
) }! C2 W- H+ `. o4 p hPal = SelectPalette(hDC,hPal,FALSE);
# s( j6 t. I) m1 C! G8 l% @ RealizePalette(hDC);1 k$ P" x; K; n" V4 |  I

# U* m, ^' }4 U2 h4 _/ K2 H //为信息头及颜色表分配内存
. k2 V7 G; J7 } hDIB = GlobalAlloc(GMEM_FIXED,dwLen);8 p; c* o$ G: Z3 `9 Y6 A9 [& r. P
if (!hDIB){
3 J' m! {; w! i; \. Z       SelectPalette(hDC,hPal,FALSE);
1 ^8 G2 o( \% X  |" h       ::ReleaseDC(NULL,hDC);
# @5 o0 |4 H% |       return NULL;& e6 K+ n( X2 c) @; F, D) o5 ]" C
}0 R4 [" s/ f; E! I

! T/ B& m, d6 ]* W lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
2 e: u. z9 i' n! T *lpbi = bi;8 E0 m! X1 G1 A- v

, n8 S' b. p5 o' A //调用 GetDIBits 计算图像大小
) F- ]4 ]8 h$ ]* Q GetDIBits(hDC, (HBITMAP)bitmap.GetSafeHandle(), 0L, (DWORD)bi.biHeight,
$ s( P+ d4 J3 n          (LPBYTE)NULL, (LPBITMAPINFO)lpbi, (DWORD)DIB_RGB_COLORS);
7 }5 o% X; A- t, ^$ \0 }$ b
9 m& l3 W! }# s bi = *lpbi;
) B! A$ G+ t: `! l# |2 `1 o6 L. w
//图像的每一行都对齐(32bit)边界
* {! l$ [4 {# |" W7 P' C if (bi.biSizeImage == 0){! ]! v4 }$ d9 V: y
      bi.biSizeImage = ((((bi.biWidth * bi.biBitCount) + 31) & ~31) / 8)
9 n9 K) J* [! m' F                      * bi.biHeight;7 o+ E7 d% B0 E$ F9 f
      if (dwCompression != BI_RGB)2 Y" F4 y4 `' O# [
         bi.biSizeImage = (bi.biSizeImage * 3) / 2;1 i' F: G+ B: k9 `6 W% \5 W
}7 X% U4 K1 G  q
//重新分配内存大小，以便放下所有数据+ ?2 R; V4 N0 T3 M0 T: `
dwLen += bi.biSizeImage;
! q+ b. W- Q4 W+ O, B handle = GlobalReAlloc(hDIB, dwLen, GMEM_MOVEABLE) ;
+ O" u, x5 r2 C4 g if (handle != NULL)
. t% W, Y) K0 j1 n$ h( L: {       hDIB = handle;
1 ?, F; z" y4 c7 _5 x5 I/ S* r else
5 Y7 t( a( i3 B2 t* s% g( G       {
* ?% ]1 F  e0 |5 I# l       GlobalFree(hDIB);
4 u* g* ~2 W: _4 g5 c
7 ]# r$ D" G7 z0 U       //重选原始调色板+ _# h' r) W2 L5 Q0 Z4 [
      SelectPalette(hDC,hPal,FALSE);) `* p1 Y  K# p
      ::ReleaseDC(NULL,hDC);' P4 }& B  B" @* Q8 a
      return NULL;" g( J, B5 ^- ?
      }
: o) s) g0 d# E //获取位图数据
4 `7 b5 ~- j8 }1 J! u' [ lpbi = (LPBITMAPINFOHEADER)hDIB;4 w/ H( x. s8 j( {: k* L
//最终获得的DIB4 Y3 s: [# G; H& s& y8 ^8 W
BOOL bGotBits = GetDIBits( hDC, (HBITMAP)bitmap.GetSafeHandle(),$ ?: e* p7 s: X) J2 u
            0L,                   //扫描行起始处4 x( }' g$ r/ w3 x" ~1 @4 z
            (DWORD)bi.biHeight,    //扫描行数% A' p8 R! G5 [. N$ C6 z" ~0 \
            (LPBYTE)lpbi          //位图数据地址4 ^0 c) b7 i" G
            + (bi.biSize + nColors * sizeof(RGBQUAD)),# D2 ~- R/ @, ~* r& y8 U
            (LPBITMAPINFO)lpbi,    //位图信息地址4 O# g2 ^2 ?0 N% _; a& H
            (DWORD)DIB_RGB_COLORS);  //颜色板使用RGB
3 `0 K% ?. I1 V5 _: X0 C! d/ U if( !bGotBits )! o9 P& G, h) j+ g9 u' r5 {4 I
{
& w. \" l( f4 T+ R1 F1 y       GlobalFree(hDIB);
6 [7 K7 M; M) a# U7 V6 }       SelectPalette(hDC,hPal,FALSE);
% i3 U- a4 Z0 }8 E: _' Q/ {       ::ReleaseDC(NULL,hDC);
) n# A2 o6 b# V1 o       return NULL;
2 W( A2 o3 I3 _9 z$ A }& b2 ~  T5 w, x2 P2 m1 A* ^
SelectPalette(hDC,hPal,FALSE);* V/ z9 L9 o: P
::ReleaseDC(NULL,hDC);6 O2 m& t6 U' b' C# U$ g  ?
return hDIB;
) k5 K: ^% @$ b0 D}1 L" Y3 D+ _, D8 S' @* C- F9 M

. ~% s( A1 a2 Y! d' r5 y2 l) i+ k* w1 d% [  D* Y
//********************************************************************************8 u' V2 c2 E; U8 e. T; V
//* 名称：SaveBitmapToFile
4 f4 E) F( K, T! K$ b" I//* 修改：徐景周(jingzhou_xu@163.net)5 D: T+ Q% e: t& _* g. \
//* 功能：保存为位图文件
5 @# g4 u" E: Z9 v8 i) r9 n//********************************************************************************
& e' w0 a# n% n% z9 G' pBOOL CScreenSnapDlg::SaveBitmapToFile(HBITMAP hBitmap , CString lpFileName) & q. W) U& E. G3 T5 y1 U
{3 Y( I! m  }" f8 J) Z) f
HDC             hDC;                         //设备描述表
; q" A# B& a2 W$ p* H: \ int             iBits;                         //当前显示分辨率下每个像素所占字节数
* [) o( L, N! J: L; t WORD          wBitCount;                      //位图中每个像素所占字节数
+ T  x6 A& Z! z, ~7 x- D; X, m+ p 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; g" @# i! Q$ b1 ?* K
                  dwBmBitsSize,
5 X2 Y, U% W" a" Q0 P& q2 H  P                   dwDIBSize, dwWritten;
( L6 h0 V+ n  n2 S4 a& s% U BITMAP       Bitmap;       ; O4 Z9 q% t- O& y, \
BITMAPFILEHEADER bmfHdr;                      //位图属性结构
: H1 \3 {9 k. L BITMAPINFOHEADER bi;                         //位图文件头结构
) i4 s$ ^6 p5 x& g. s+ T LPBITMAPINFOHEADER lpbi;                      //位图信息头结构    . v/ |) D& l" W
  P6 E/ r) V9 M2 u/ [4 e
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2 x. m3 {# C" z. K. |& K
: x8 j( x' a. P% N2 b" y; y$ \( U

& e$ |0 H$ G- ^ //计算位图文件每个像素所占字节数
0 o$ d% o. @) _. C  R hDC = CreateDC("DISPLAY",NULL,NULL,NULL);
& X( M9 n* m2 I iBits = GetDeviceCaps(hDC, BITSPIXEL) *
/ x6 \3 q' b5 a- b- v2 S. r: j GetDeviceCaps(hDC, PLANES);5 u- i7 O: p( V
DeleteDC(hDC);
* g# n1 s7 @7 U5 c1 ? if (iBits <= 1): R3 e- g0 K1 ^- V
   wBitCount = 1;$ B; O9 s2 t* R7 R0 k
else if (iBits <= 4)6 W) i, i! ~- L  M: J
   wBitCount = 4;, A/ X+ Q# ?! a+ ~% E
else if (iBits <= 8)9 d3 n3 C7 {+ A4 z6 [
   wBitCount = 8;
2 s$ P' T+ R6 J, ^% t! y3 a1 K else if (iBits <= 24): e: L3 ]" }' H8 `  e) O
   wBitCount = 24;
7 o& Z' J- N: G4 \/ ]( W
9 M. }( @# ^- l' N; i6 X //计算调色板大小8 `& Z$ v# T  `) Q. j( n; j
if (wBitCount <= 8)5 Y' y- E& Q' O- \
   dwPaletteSize = (1 << wBitCount) *sizeof(RGBQUAD);
6 h- u9 b" Y" C3 H2 F  {
: [5 E; c8 \# N# L5 b% M //设置位图信息头结构
! u3 `) b! Q/ G) U) {) c  J GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
/ U+ g: ]+ e9 t* x4 U bi.biSize          = sizeof(BITMAPINFOHEADER);
; r) m9 R* w% ?6 T8 S! b3 D  H! Z8 d bi.biWidth          = Bitmap.bmWidth;
9 z7 ?9 q! t9 z7 b. U2 |/ S7 ] bi.biHeight       = Bitmap.bmHeight;5 }( E5 I4 r6 W3 P, D
bi.biPlanes       = 1;+ D4 A' X2 O2 G
bi.biBitCount       = wBitCount;
, X7 z9 V# e4 i0 O. V% o bi.biCompression    = BI_RGB;
1 V3 ]: m7 b- W' z9 N  y! U, o4 z bi.biSizeImage       = 0;" N* E; Y- w) }% G" o* [
bi.biXPelsPerMeter    = 0;- Y: T3 N2 p) v) v! \
bi.biYPelsPerMeter    = 0;* D* v9 X) }7 a% w. w% l0 ?- B
bi.biClrUsed       = 0;) {4 f; x$ L% ^3 ~
bi.biClrImportant    = 0;0 G% B7 U! }" D/ k+ Y
dwBmBitsSize = ((Bitmap.bmWidth *7 S( |2 }1 B4 v- p  j* p
wBitCount+31)/32)* 4
8 t; U/ x, X+ e) I0 ~" X9 ^    *Bitmap.bmHeight ;
5 k. M+ [' i9 w8 M) H$ e8 v  a7 v3 u" V
//为位图内容分配内存- h+ ^6 q  c2 @* h: `) P. C: x
hDib  = GlobalAlloc(GHND,dwBmBitsSize+( L4 f" D# D4 H, b9 E
dwPaletteSize+sizeof(BITMAPINFOHEADER));
( ?* }6 q( c/ ^* O1 { lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);$ G+ V, x) M& D- M6 V8 ]; }
*lpbi = bi;
& V7 z1 `# E+ ^/ D. |: V4 U1 ^0 a/ R3 N% T. c" H
// 处理调色板 ( l  p$ V; u1 c2 H, m3 n- M
hPal = GetStockObject(DEFAULT_PALETTE);
; S* D" U' U+ v: u0 y( e9 B if (hPal)
4 G' i3 D7 B: Y9 N {
  m& E; ^) n- M" k    hDC  = ::GetDC(NULL);
% ]7 T# s& j7 v- `, P) x. k    hOldPal = SelectPalette(hDC, (HPALETTE)hPal, FALSE);
- V- j( v; Z8 M9 b% P8 X) E    RealizePalette(hDC);$ x) Q+ k+ Y* G. S& {* f
}( {+ P" T8 i% N6 I) X

* P" q9 u+ G* I( I  // 获取该调色板下新的像素值
! r; `0 @0 T5 H* D GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight,
  T5 R4 O3 j% j+ O. {) z% I- ]    (LPSTR)lpbi + sizeof(BITMAPINFOHEADER)+dwPaletteSize,5 o7 B+ R% o' V5 S- r/ ]9 k
   (LPBITMAPINFO)lpbi, DIB_RGB_COLORS);1 h, e/ s2 e; U/ u* n
2 v2 V  I* Z& [1 q+ ]2 v( `
  //恢复调色板 / \9 u. Z, K+ q9 j6 s3 v/ z% w' S. u
if (hOldPal)( {  d0 Y  |2 T6 E4 M# V
{( U; o3 H+ p; `. ^: H* n
   SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);
) Y# v- N/ u, i    RealizePalette(hDC);7 ?7 \0 E, X$ Z5 u& L& u
   ::ReleaseDC(NULL, hDC);
8 b/ l; i! ?- V& q$ D }$ z. E, o9 l# _1 T) U

; v( J7 i. H. N$ \# I$ }% I, j //创建位图文件 & _: Y* k3 ?- i; ~6 v6 v! R6 c3 N
fh = CreateFile(lpFileName, GENERIC_WRITE,
7 v0 v, t# j. k* ~5 B5 ~       0, NULL, CREATE_ALWAYS,
: \$ B# C/ R5 P       FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
" ^# O: R: S* b if (fh == INVALID_HANDLE_VALUE)
9 m# Y) P. m8 m5 g; @    return FALSE;
$ K% h2 N3 Y) @" d9 f
) W/ Z# p9 A& O3 L4 V // 设置位图文件头5 x  I" }, }6 a' `6 U* k
bmfHdr.bfType = 0x4D42;  // "BM"& B+ `4 u! G, g
dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dwPaletteSize + dwBmBitsSize;  # h6 B! N1 }& k* Y. ]
bmfHdr.bfSize = dwDIBSize;) v( Y; A, O/ _! E! W7 Q- {$ _1 B
bmfHdr.bfReserved1 = 0;
( ?1 g9 G2 ]: K( N5 N# F1 ^ bmfHdr.bfReserved2 = 0;
1 s, Q: W2 m( M9 @ bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) 9 n; ^" k% T2 p# R/ u
   + (DWORD)sizeof(BITMAPINFOHEADER), X5 Z. S0 P. u9 R
   + dwPaletteSize;
. d! @9 s$ J# O% `6 E! F8 q: T/ G1 K$ v% B; t* {* h5 ~6 C

: A' y4 i( R6 M$ x! q; P1 \ // 写入位图文件头3 f( p2 ?' _+ K8 V" O2 l" H5 u
WriteFile(fh, (LPSTR)&bmfHdr, sizeof
9 @9 x/ O; Z  W! j (BITMAPFILEHEADER), &dwWritten, NULL);8 o( L: {  Q0 Y' i( o2 S% E8 s. j1 s
" c: z% }0 Z) X" v+ F" j& r/ Y; |6 N
// 写入位图文件其余内容
* i( n$ C5 T7 N$ P) X WriteFile(fh, (LPSTR)lpbi, dwDIBSize,
2 }8 w4 _/ b+ i# V1 Y &dwWritten, NULL);
; d6 N& j% _% o2 }8 W4 c3 j$ _, K" m- L
//消除内存分配
5 c+ R7 S  v# i. H  [7 Y3 J GlobalUnlock(hDib);" Q" z4 }  r: ^* i' i6 ?
GlobalFree(hDib);* Z$ R; r) z* j* g3 ~
CloseHandle(fh);
% L3 ^4 E% G8 F9 f# U
; i7 J. D4 f4 y return TRUE;
$ O' ?/ u6 f* B$ ~}% c7 Z; d4 L. C9 s& }

1 r, i$ C6 m7 @$ [0 H) b" I' c
3 [' h4 X: e; ]2 M. e20. 如何获取局域网上计算机名及它们的IP地址
  a+ r- q" _& f0 x- B6 l
7 v* E: ]7 @( e+ S, \" |l 连接ws2_32.lib和 mpr.lib库
4 R; o4 V; l. i/ h: H0 ~+ w) q$ J$ U3 K5 v4 _( J. j; F* D
l #include winsock2.h+ M7 f( K3 t0 \, W- d0 a' B/ \

( I5 h, W# _; w" d; R4 k+ aCString strTemp;! l$ |& U( B1 E& {) I
struct hostent *host;9 u1 `" H- U) E# _+ h- q( e

7 K/ C/ `3 A7 B5 r4 L/ z0 _struct in_addr *ptr; // 检索IP地址 ' I) @) ^& b" F
DWORD dwScope = RESOURCE_CONTEXT;# ]8 r! Q7 f3 _7 [
NETRESOURCE *NetResource = NULL;
- k) |$ p" C! O0 ^0 w5 kHANDLE hEnum;
! w* M! j- Q/ t1 N: F% ?* yWNetOpenEnum( dwScope, NULL, NULL, * R9 P5 y+ F1 m3 D2 x6 o
         NULL, &hEnum );
1 O9 J! G' l3 D+ q' D. t
! N7 _# l- N# ?* kWSADATA wsaData;  r3 V1 T5 I1 ~; o! w. J; V# R
WSAStartup(MAKEWORD(1,1),&wsaData);
/ e4 [7 l) x: E% V6 e/ \9 U$ q/ e' v2 w& E& ]3 k* l
if ( hEnum )  N& U3 d# m5 |6 v  n  I0 d
{) Y6 I- F% d2 }+ S" o
DWORD Count = 0xFFFFFFFF;
: O9 C0 |6 L5 [) B# X$ v$ D$ ` DWORD BufferSize = 2048;
) @0 I  n! p. g6 e! I4 Z9 y$ @$ e LPVOID Buffer = new char[2048];* T* z) X) K/ n3 C
WNetEnumResource( hEnum, &Count,
( T) C8 @' q+ m% f, b2 |       Buffer, &BufferSize );
5 v+ q9 H9 Q# {  e7 S NetResource = (NETRESOURCE*)Buffer;* d; F2 o3 V6 Z0 @# J  @! \
' D3 `+ d+ Z! }( X! ?% u
char szHostName[200];
, a% i7 C& X9 _* ` unsigned int i;
$ m8 l; J$ l: u( ?$ {
0 ]% t- Q9 C' j6 c: A for ( i = 0; : \  D* ^+ u0 o9 k, x. A) \+ h
      i < BufferSize/sizeof(NETRESOURCE);
, ]8 r9 v8 f; n       i++, NetResource++ )
; n% Y! Q* J& G& M" [9 y {0 ]2 F9 s, I0 H1 E# [9 N2 U( L
      if ( NetResource->dwUsage == $ d8 K  _6 b, X0 t
         RESOURCEUSAGE_CONTAINER && / H0 ^0 Q- @0 K4 w: x9 i0 d/ F3 {
         NetResource->dwType == ) V( d  d5 b9 S
         RESOURCETYPE_ANY )
: f/ C5 t: q5 ^1 L, g# H       {
- C5 q+ v0 H. U! n          if ( NetResource->lpRemoteName )1 E( n; J! G* V- h+ ]
         {
$ w  [" L9 Q; G- n( R, u" ~  m             CString strFullName = # b/ r+ q  ]) @8 n# d6 f2 X+ {
                  NetResource->lpRemoteName;+ J7 d: f* ~3 T8 Y
            if ( 0 == % ^2 d, z7 I- d: ]( x9 B  ]) Q
                  strFullName.Left(2).Compare("\\\\") )
" z5 ?3 ?( @# x9 ~, @- _                   strFullName = ( `  F5 H+ L) ?/ V+ Q' x. a2 k$ l
                     strFullName.Right(
: d  M2 Y( R* E" P9 l                         strFullName.GetLength()-2);
* N8 G* S, |5 C2 R) A; Q/ _
+ Y+ \: N1 L$ ]% }& z* k             gethostname( szHostName, ) C. u5 [. ]6 a( Z- j& ^
                  strlen( szHostName ) );
) V9 ]& g  L! O( h$ P             host = gethostbyname(strFullName);
$ ~# n1 `. r! B8 Q, b9 |% B$ i) x2 d& K: N
            if(host == NULL) continue; 2 v2 v; b' R+ Q" a; G$ M% T
            ptr = (struct in_addr *) # R1 v0 P( @- c# O2 G# h
                  host->h_addr_list[0];
4 F# H2 a7 {" I' l  O
2 }9 ]: N/ j' Q, D0 t; `             // =. 分隔开IP:211.40.35.76.            J3 Z( P$ v" S
            int a = ptr->S_un.S_un_b.s_b1;  // 211
' a( }0 `- D" I- c4 Q" ?4 Y3 t             int b = ptr->S_un.S_un_b.s_b2;  // 40
) D) l+ F6 M1 Q  G+ d             int c = ptr->S_un.S_un_b.s_b3;  // 35
8 K8 s7 W3 L3 c9 d( d- N             int d = ptr->S_un.S_un_b.s_b4;  // 768 w4 Y8 Y9 e; L/ X# A# ^. r$ z

, o9 m% g: z& u( m1 o: X. I/ o4 m             strTemp.Format("%s -->  %d.%d.%d.%d",! N8 @1 i" F: I4 e: Y0 `, ?
                  strFullName,a,b,c,d);  `/ |! g. e0 x8 Q3 a3 Y5 P) h5 Q
            AfxMessageBox(strTemp);( O1 D- @# E# y3 i+ H/ }
         }: z1 d  i$ [3 z: M' G* c0 Q
      }7 Y2 \: g$ l) P
}. g  I$ ?) T0 Y: e

& x; o' s- I  w7 m1 Y, R delete Buffer;
8 \: h% `7 u/ V* H$ X9 M WNetCloseEnum( hEnum );
9 Q. ?9 \3 g) p5 ]}
4 ]' p5 X+ O5 P- k4 y
. }# U2 M% I4 H/ G" ?WSACleanup();

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