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;9 n. T$ M( z' ?2 y) P* w6 C% F
                  }/ w: V" [2 J( r+ Y: I2 ^

8 x: n! j$ t+ k  T                   // 修改位图 DirectBitmap+ U9 w; q: R$ e! K, k& n) b. \
                  SelectObject(DirectDC,PreviousObject);* M; S* t- e0 W: ~5 W7 N5 w: r
                    H! p. a" a2 `) O% A: F
                  // 完成0 `. G' M9 s1 A" W8 f: s+ ]8 a) ~
                  RetBmp=DirectBitmap;
, k' K" i7 a. ~             }
. |+ s6 Z# S6 A5 V7 O: Y2 _             // 释放DC: W9 @& x" |0 w% M6 [% W
            DeleteDC(DirectDC);
1 Y. d4 W! Z( t) `          }
3 }# o, Z$ y' Z# M8 z- q* \          // 释放DC. e8 x0 U) u( E! X
         DeleteDC(BufferDC);
9 W0 z- _5 M' L; _       }3 z8 e/ ?1 [2 l. u* Q# z
}
# ~3 o# S; w( f) m1 ]4 O return RetBmp;
  i3 k# ]9 s% [}
, {, M" U/ d9 K3 z# x
$ r0 a/ A% i; G% d/ U5 B: t
6 O5 A7 k( S8 u用法：7 V$ p5 Y' N' f; R4 q

( p2 D6 n$ [' y1 y' h# k% MHBITMAP hBmp2 = LoadBitmap(g_hinstance,MAKEINTRESOURCE(IDB_SAMPLEBITMAP));8 x( c5 ^8 i5 [) A& A
HBITMAP hBmp = ReplaceColor(hBmp2,0xff0000,0x00ff00); // 替换蓝色为绿色
6 E1 w- x2 s+ Y; b......9 T  a. ]' a% v
1 b" {2 M3 Y, K
DeleteObject(hBmp2);
9 A/ W, w! p! @. DDeleteObject(hBmp);
! \3 e/ ]5 f, L. e8 a5 @4 ^, ~" {  p+ d" s& t+ ~: g
& }% Q  C+ u8 j0 k& Z( ?: x
19. 如何转换并保存位图0 `5 l! {1 k, m% g# e( _# A2 C4 a

& Z8 P7 @4 g6 A$ ^" ^6 c2 y//********************************************************************************
$ t- ?! |6 U! a) F9 @! _$ ]//* 名称：DDBToDIB+ Z5 K+ K2 F: M) G
//* 作者：徐景周(jingzhou_xu@163.net)" v" L2 t' S6 B7 Y# g
//* 功能：设备相关转换为设备无关位图$ R& }' Q* N+ Z/ ^8 U6 T5 q# E; H7 l9 ^9 M
//********************************************************************************
4 r: Y/ z9 C3 g3 R3 @0 t' x" M- A) [% }. H" a# X8 n
HANDLE CScreenSnapDlg::DDBToDIB( CBitmap& bitmap, DWORD dwCompression /* = BI_RGB */)
, e. U, `' i2 v: w9 J% y: S- A' W! q{
5 \  w: F. n6 ? BITMAP             bm;
8 Z% P; l0 F9 ^7 a3 R: M4 u1 } BITMAPINFOHEADER bi;
6 m7 {9 g# G7 o$ W! {7 f7 v% n LPBITMAPINFOHEADER  lpbi;
1 `1 M% Q! i9 }0 P' f DWORD             dwLen;8 e% F' ^6 C4 A  t) L' ?
HANDLE             hDIB;
$ p, k; @& g% c% }; E. Z" M. B HANDLE             handle;
& y  }6 a  i4 v/ U HDC                   hDC;
& K2 q% s0 K6 i) {) M HPALETTE          hPal;
# p" N5 }" j  \1 ^9 D  W7 }* C& U1 _! |
CWindowDC          dc( this );
4 A, u( \7 G5 H* X' u: j. b CPalette          pal;& @: N: Z: |  H5 X1 ~) a4 e
//如果支持调色板的话，则建立它  w0 _& L' W5 `: K2 m0 z8 n
if( dc.GetDeviceCaps( RASTERCAPS ) & RC_PALETTE )0 h5 N' W1 r, I
{
! o6 ]" W7 T) p8 r) a; |0 j( N       UINT       nSize = sizeof(LOGPALETTE) + ( sizeof(PALETTEENTRY) * 256 );0 K9 q, |9 j' G9 `- |6 |
      LOGPALETTE* pLP    = (LOGPALETTE*)new BYTE[nSize];
7 M% z4 Q* n) E       pLP->palVersion    = 0x300;
) E# d% J9 T" ^* P4 [       pLP->palNumEntries = (unsigned short)GetSystemPaletteEntries( dc, 0, 255,
$ v5 `4 d7 W8 y# k, g* ~8 f       pLP->palPalEntry );8 x) N" q" M2 ]! K* D* B

; R1 d' o+ |" B$ p4 r" b2 ~       pal.CreatePalette( pLP );- ~: E4 h" @% z

6 ?: l! Q0 D% A) _; t       //释放
7 q) W' [  ?8 c  o: ^( d       delete[] pLP;
  Y( s! a2 `7 F: q }
6 S3 e6 G( |3 F0 u1 s9 J
/ b5 s, w4 P* j6 s$ }) {5 A ASSERT( bitmap.GetSafeHandle() );
, B6 H$ y; _: z3 e6 u0 X
- Q" Q8 E1 |5 L! U: e; c9 K9 M- `) N' m5 X! ?
//不支持BI_BITFIELDS类型
* M! k' |! S, [4 @: h2 a! o if( dwCompression == BI_BITFIELDS )
! `; p4 W3 [7 X       return NULL;9 y+ o3 z; v- |  g% _
- t7 D# p5 \2 i" P( i7 T) q% m- Q
//如果调色板为空，则用默认调色板
: P# O2 D" [3 B; d3 X: i hPal = (HPALETTE) pal.GetSafeHandle();6 i6 {, b! P+ l0 K' u2 ~' @
if (hPal==NULL)
1 ~, U! J; c+ x, W' }' y& U8 D       hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE);" `; W; u" G4 ?9 [8 ]7 e7 A
& W: ^8 c' p$ E
//获取位图信息
, t1 ^" J6 t4 j- B bitmap.GetObject(sizeof(bm),(LPSTR)&bm);
5 K7 B; H: o$ [5 k5 ^) M" P/ G0 y- \/ Y& O
//初始化位图信息头' e: }9 \7 S9 v2 i0 e2 K
bi.biSize       = sizeof(BITMAPINFOHEADER);
: H' M. U% U' K; a5 O0 \, x2 K bi.biWidth       = bm.bmWidth;
: A  F0 l. z: f& b bi.biHeight       = bm.bmHeight;
0 o2 C, c- q; J4 B$ U. E0 n bi.biPlanes       = 1;( |$ n1 i7 m$ m, ~. o) y; ^
bi.biBitCount       = (unsigned short)(bm.bmPlanes * bm.bmBitsPixel) ;
& y2 U' e  r+ W0 k1 n bi.biCompression = dwCompression;, E7 s* D+ ]$ s8 ]
bi.biSizeImage       = 0;
/ S$ X% H6 @. n7 S1 G( a. ?  b; Q bi.biXPelsPerMeter = 0;
# Q6 j. W: Z3 B8 k( l1 \ bi.biYPelsPerMeter = 0;. Y  N9 P' p. f
bi.biClrUsed       = 0;
' E3 r0 _! h+ n- e9 m$ J) E- p bi.biClrImportant = 0;7 \" H8 {$ b6 a/ Y$ Y. L6 F! f* ~

. j7 r! E+ K( x //计算信息头及颜色表大小1 R5 f( {7 p! b, ]' u$ n
int nColors = 0;
' Z" I; D( |, o7 J0 Q7 k6 d1 N if(bi.biBitCount <= 8)6 i% u4 `7 a" J. J+ T
      {* z. v. i# ^: k
      nColors = (1 << bi.biBitCount);
! J/ E8 N5 x: B" M       }- \3 ^; Y6 b/ N0 b/ k  m$ a
dwLen  = bi.biSize + nColors * sizeof(RGBQUAD);. y  M+ f1 I+ q

* l4 W+ v! R3 J9 K* v: ^0 o hDC = ::GetDC(NULL);
8 ?  l) B5 P& b1 x, R+ R hPal = SelectPalette(hDC,hPal,FALSE);, `0 p7 F( l; d8 n
RealizePalette(hDC);
* j+ a: p; c. t; g6 K  ]9 ]# |) A. X0 ~
//为信息头及颜色表分配内存
/ {6 A3 ]; {5 N; Y1 [5 m0 `% t hDIB = GlobalAlloc(GMEM_FIXED,dwLen);
. B5 e" n* D' l) [ if (!hDIB){
6 T. x. [! z- j# _: u# D; G* C* [, G       SelectPalette(hDC,hPal,FALSE);" T3 D# W, q5 T5 }
      ::ReleaseDC(NULL,hDC);( i- K8 d- O5 Y3 b( N$ M, N( O0 h
      return NULL;
/ ~# \& i2 U7 C5 r2 P }! k- g, q2 L, f5 ^" B

! I, p0 l) O1 _- }+ C/ l/ o; r lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);& O! J' i) O3 r9 g
*lpbi = bi;& N  _1 I% z3 d0 \  h1 b( z/ u
8 v6 d  x. s; X9 t/ H
//调用 GetDIBits 计算图像大小
/ H/ b/ P; P. E GetDIBits(hDC, (HBITMAP)bitmap.GetSafeHandle(), 0L, (DWORD)bi.biHeight,
! C" Z' Q4 D( L' g0 D+ O          (LPBYTE)NULL, (LPBITMAPINFO)lpbi, (DWORD)DIB_RGB_COLORS);. A+ Q& a5 H$ p

( v, c/ N$ L5 ^+ \5 e bi = *lpbi;
) o# j: l2 j; Q( r' }, _2 m. Y, p' G
//图像的每一行都对齐(32bit)边界
. X/ x+ `3 f/ z8 j4 i% R( M if (bi.biSizeImage == 0){
7 }; v$ O2 L# I       bi.biSizeImage = ((((bi.biWidth * bi.biBitCount) + 31) & ~31) / 8) : r6 M( F, h) ]! n
                     * bi.biHeight;+ [/ ]: Z6 T; w& ~- w2 }- U
      if (dwCompression != BI_RGB)6 H, O+ k$ }$ P2 j! j4 U8 C
         bi.biSizeImage = (bi.biSizeImage * 3) / 2;
( ?5 j. w5 `+ G% O, w }
4 S$ A' [8 v- F% R //重新分配内存大小，以便放下所有数据$ Y, Y4 Y4 K* }# V4 R
dwLen += bi.biSizeImage;$ M  t* r' e6 }) d# X! V% m
handle = GlobalReAlloc(hDIB, dwLen, GMEM_MOVEABLE) ;
% o0 I2 W: u$ I if (handle != NULL)
9 |3 ~4 t% Q4 K* N* N; v       hDIB = handle;% q+ K& V+ n! N7 q% ?
else
$ O# a4 p0 B5 ~: O  Q) r/ W8 `       {
, Y( z0 r) }+ {/ n$ {/ ^  |       GlobalFree(hDIB);0 k$ A% X. }  _0 P: o. R
! v/ g$ C  H& ?
      //重选原始调色板% Q0 z7 Q4 |( l! V/ y4 c# D
      SelectPalette(hDC,hPal,FALSE);$ {* r& T& s# |- ]8 c+ W
      ::ReleaseDC(NULL,hDC);1 T7 v0 R0 E* Z  W2 A
      return NULL;" O# X3 e( x5 ]: K/ f
      }
$ @0 V5 K1 K# Q2 _7 h: X //获取位图数据: V, v4 H4 S, X1 b/ o
lpbi = (LPBITMAPINFOHEADER)hDIB;$ T$ v/ ~& _9 I; W+ {- _* P# g
//最终获得的DIB
  ^1 L) F( I2 @* n6 i5 L: W BOOL bGotBits = GetDIBits( hDC, (HBITMAP)bitmap.GetSafeHandle(),
# y0 ]; |3 a: \1 X             0L,                   //扫描行起始处
6 O4 ^% z0 L9 W: J7 x             (DWORD)bi.biHeight,    //扫描行数: I. r5 y2 e2 R  F# i" J" v# {$ E
            (LPBYTE)lpbi          //位图数据地址5 D9 Q0 A! f5 y
            + (bi.biSize + nColors * sizeof(RGBQUAD)),
5 P- ^/ S$ C( F7 O             (LPBITMAPINFO)lpbi,    //位图信息地址
9 u9 C! D" f4 p5 ?( E0 J- b$ m             (DWORD)DIB_RGB_COLORS);  //颜色板使用RGB
* A$ n' {8 q* n" t" u+ \4 z, B if( !bGotBits )
7 s( P! ~4 Q+ }4 A {
- J0 a# T1 f; d2 H  ?       GlobalFree(hDIB);
- E: |4 D5 r5 T0 p/ `( ]       SelectPalette(hDC,hPal,FALSE);
1 C# E1 Y6 q8 P4 v0 E8 H: e       ::ReleaseDC(NULL,hDC);6 }6 ^% i3 @5 ?+ M
      return NULL;# l, I, E5 ^+ G; V5 n
}3 D8 `0 X) }5 k
SelectPalette(hDC,hPal,FALSE);
2 v2 i  X& O6 ]  N9 r5 X ::ReleaseDC(NULL,hDC);+ E0 ]+ R3 x# q; ]  F4 a+ z
return hDIB;
8 {  K. }# Y/ w, F$ i8 j}$ q; J* }" ]! Z0 s7 z

% X) p. O. o6 L1 f
3 C; P6 m1 b8 S//********************************************************************************- P( ?% h3 @7 q$ W8 g7 Z, ^
//* 名称：SaveBitmapToFile
9 p7 C5 Z7 `3 Y* T) N, S//* 修改：徐景周(jingzhou_xu@163.net)* f$ r0 G/ C: L: [' q
//* 功能：保存为位图文件1 h. l. P# A4 W9 W- H
//********************************************************************************3 S0 ?- a" W. V- O( Y3 L
BOOL CScreenSnapDlg::SaveBitmapToFile(HBITMAP hBitmap , CString lpFileName)
& W0 W1 O9 M3 q9 K  Y{
8 S  P! `9 z0 x/ U$ D HDC             hDC;                         //设备描述表
9 Z0 u" b. k2 ]+ I2 e int             iBits;                         //当前显示分辨率下每个像素所占字节数
- }: f! F" R5 | WORD          wBitCount;                      //位图中每个像素所占字节数
$ a8 X& d2 i2 m" {- c& o 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8 a1 b2 `2 I$ f# h: ?
                  dwBmBitsSize,- A. m+ w, H3 r) G0 I: V4 l1 L1 D
                  dwDIBSize, dwWritten;
$ q# x6 q  r- n# `$ i+ F  p BITMAP       Bitmap;       ! ]- r* P. \6 J  m2 r9 a$ f
BITMAPFILEHEADER bmfHdr;                      //位图属性结构 : q8 z2 o% v4 q) p4 }
BITMAPINFOHEADER bi;                         //位图文件头结构    / T6 K! ^# a" W( l. |! J
LPBITMAPINFOHEADER lpbi;                      //位图信息头结构    9 I) ?# [8 y# h2 f' _

5 G3 H) J/ v, [& m7 g 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
, B! Z+ O9 _( K/ `: P& y3 |  w9 [' V0 x' [! _

' @8 F9 F9 P2 G: t //计算位图文件每个像素所占字节数7 [' b+ p( O, F2 S1 y& K, g0 Y! n, |
hDC = CreateDC("DISPLAY",NULL,NULL,NULL);: ^  {2 {4 ~9 [4 m- x
iBits = GetDeviceCaps(hDC, BITSPIXEL) * * E/ ?! L, s5 `* Q2 R! @
GetDeviceCaps(hDC, PLANES);9 t0 U8 _) {( V0 ~& X& u0 c
DeleteDC(hDC);
1 E+ `' D( _* x& r1 j2 p5 v) @( F) R if (iBits <= 1)! @4 A+ y8 x/ B) m9 E
   wBitCount = 1;
" P6 I) |1 p8 w  d1 ~ else if (iBits <= 4)7 H4 @  l; w" a
   wBitCount = 4;
) N) _' m* P, d) n' {6 ] else if (iBits <= 8)* L  k0 T' |3 M- _( R
   wBitCount = 8;
% e. ~, O$ H0 |8 O4 [. `4 [0 l! Y# P3 ` else if (iBits <= 24)
5 y, `; Q+ ]/ k! g) d8 }    wBitCount = 24;
3 F( o* E; H* ^8 N
* g$ I- @& C2 ~ //计算调色板大小& n9 T+ b! g8 K
if (wBitCount <= 8)
( G' ~& P* \% w8 E" {) ?, s, l    dwPaletteSize = (1 << wBitCount) *sizeof(RGBQUAD);! a) b5 _9 x9 O! w5 ^

% V' t. D0 J, T' h7 J //设置位图信息头结构
" z% m/ j" x+ g8 L$ n GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
: l* }. k1 J( I( K' Y+ C3 p- t bi.biSize          = sizeof(BITMAPINFOHEADER);
: t+ u0 j- c; E# o3 M2 g( ] bi.biWidth          = Bitmap.bmWidth;) k* H0 d. S8 O+ w) d, G
bi.biHeight       = Bitmap.bmHeight;/ W& m" W8 d# A1 l8 Y# V# y) w" @' T
bi.biPlanes       = 1;' I  D1 O: I  U1 ]7 b! y$ r
bi.biBitCount       = wBitCount;
2 \4 p7 P, E' ]- M0 D bi.biCompression    = BI_RGB;; h1 H8 X9 A/ P+ G& [
bi.biSizeImage       = 0;
, F! Q. S5 E4 k# I/ H$ |- I1 s bi.biXPelsPerMeter    = 0;
# h+ V8 e+ i( u+ M9 d+ } bi.biYPelsPerMeter    = 0;/ t* t* S9 C  H* U& x( [
bi.biClrUsed       = 0;- T0 e: K6 \, C; X" e5 X) C9 `
bi.biClrImportant    = 0;
  t* H: f+ o4 F/ P: Q dwBmBitsSize = ((Bitmap.bmWidth *
' L8 G% q: |* e wBitCount+31)/32)* 4) H( H6 e2 T" i0 F( {9 T
   *Bitmap.bmHeight ;
3 v9 |4 c$ z5 P+ q" J3 `6 N' Z. i
0 }. c8 M1 _: V# h //为位图内容分配内存$ ]# U: R* P( |- r  G
hDib  = GlobalAlloc(GHND,dwBmBitsSize+& M( W$ x4 `/ Q0 a; O4 v& r& b! ?
dwPaletteSize+sizeof(BITMAPINFOHEADER));
. x- S9 }; F% Y" b7 ~9 d  V* Y$ s lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);/ U9 ?5 N( u. y: d
*lpbi = bi;3 v1 O# _' ^9 s2 p. q
. U: p$ F" _+ Y+ M3 v, Z; s; d% t
// 处理调色板 ! L( x7 A* [' y. i3 y" o- i# D
hPal = GetStockObject(DEFAULT_PALETTE);
) z4 n5 D6 F) j; G# J- [ if (hPal)3 F- O( f) L2 I4 |( W% U1 T" \
{- L- M7 W2 r, p, J% ~* t0 X! m
   hDC  = ::GetDC(NULL);+ s0 L4 K8 V4 v9 _( V9 N
   hOldPal = SelectPalette(hDC, (HPALETTE)hPal, FALSE);2 z- t2 D0 _: x8 `( O' C8 K
   RealizePalette(hDC);
# B3 d+ i  L: Q) {& x }# d& C' n3 ?$ R3 {5 h
0 K: U* I9 n7 E
  // 获取该调色板下新的像素值
3 l& y+ G" H7 Z0 `1 o7 k9 I GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight,6 H1 G! S+ _) H
   (LPSTR)lpbi + sizeof(BITMAPINFOHEADER)+dwPaletteSize,
% M- I# U! x5 V) C: S7 z9 V4 p: K    (LPBITMAPINFO)lpbi, DIB_RGB_COLORS);! G3 v3 j- G- x9 e& g

: W# s# ^1 {, J* _  //恢复调色板 0 ~+ d/ ?2 G3 F( [
if (hOldPal)+ [: h* ?- u" B; E: ?3 {
{
9 d4 J, g. Q* w, c& x! b) K4 I" E    SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);( L! Y& T5 @/ ^: p
   RealizePalette(hDC);
( D& B/ t. K1 @' Z' S    ::ReleaseDC(NULL, hDC);
$ b* A2 y' o& q }
' d( W% s' Q  z7 [  \
; n6 U7 ?% Z+ B //创建位图文件
" j5 V7 a& B" F5 r2 @ fh = CreateFile(lpFileName, GENERIC_WRITE,
) o9 }4 X' j0 B       0, NULL, CREATE_ALWAYS,* x8 D/ s- z, e- a1 ^$ B
      FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);% l+ ?$ V0 H4 E7 I2 k. S" g
if (fh == INVALID_HANDLE_VALUE)
; Y9 e5 d+ P4 o( Y    return FALSE;# ?, r/ n  l0 o2 i! O) D8 L

8 ?* m3 @; N( x4 r$ M2 V // 设置位图文件头
: v5 P% p. `! N( a bmfHdr.bfType = 0x4D42;  // "BM"
0 i3 c  W5 t% j" @) N! x dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dwPaletteSize + dwBmBitsSize;  ; P6 s9 c2 M  H$ ^! G7 y9 j$ }
bmfHdr.bfSize = dwDIBSize;
( K! V- p) Q* r9 W bmfHdr.bfReserved1 = 0;
' b5 J0 B% c: S bmfHdr.bfReserved2 = 0;
; V! h, h( u5 t/ _7 R) m, x bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) 4 N. c* B5 N1 P0 l
   + (DWORD)sizeof(BITMAPINFOHEADER), b. F, k6 I6 r$ w8 t
   + dwPaletteSize;' {$ P; E7 X4 c: \( F

- z$ Y$ S, W" F% F/ ^0 X2 i* O3 ~3 }2 i  f/ [; v8 }3 L
// 写入位图文件头
( v, O6 M6 X: [! P WriteFile(fh, (LPSTR)&bmfHdr, sizeof/ ?* p5 P' ^! B
(BITMAPFILEHEADER), &dwWritten, NULL);5 }8 r+ ^8 V, X# H6 D0 |( ^* m" M
+ J. ?4 f0 L$ M& W9 d
// 写入位图文件其余内容
1 m2 T. r3 V+ I5 |4 X# V WriteFile(fh, (LPSTR)lpbi, dwDIBSize, # ]0 s7 {" t# N& V
&dwWritten, NULL);
4 W9 u& D2 Z. c" d+ o
7 l; y$ }1 q& G7 S //消除内存分配  1 K$ T$ n) F% q8 h
GlobalUnlock(hDib);7 \' _: c; f" n* |2 S" i/ r
GlobalFree(hDib);
0 E) p3 h$ c* y" ]3 f$ s+ d CloseHandle(fh);
' D. T& E# j% w5 f  n
2 S+ B" X" {" w# X5 m return TRUE;" |- y, Y( M6 Y
}1 J  @/ W8 j/ g! B0 [

1 k- D- r+ ?! _  X; e. }1 Y8 |% h6 Q
20. 如何获取局域网上计算机名及它们的IP地址6 l: ?! A3 O# s; m
7 F7 L1 [' q# i) x
l 连接ws2_32.lib和 mpr.lib库- i; V  ^6 q( u

# H% r, I! D/ o5 E7 A$ d1 sl #include winsock2.h
; F9 p  v' h0 O3 C5 `6 C# r* j7 D9 ^
CString strTemp;+ w: `6 E, r# [6 w
struct hostent *host;* L2 b8 U' r' }  u/ V
& [# m/ @( G/ L  ?! t  G3 j8 ~( }
struct in_addr *ptr; // 检索IP地址
8 X% h1 L* H( \' ~( bDWORD dwScope = RESOURCE_CONTEXT;
8 P( z7 N5 V; ]. J! X# gNETRESOURCE *NetResource = NULL;. s0 b5 b- W; N3 V; R3 m, z
HANDLE hEnum;' B! ?/ c; U5 k# a9 Z( f- y; M
WNetOpenEnum( dwScope, NULL, NULL, 9 q7 r9 O  ^; A
         NULL, &hEnum );
+ S( ]% s" N% J: C$ U9 F2 m4 Q0 U' c
WSADATA wsaData;
; F9 k/ ~& y6 f4 I: I# fWSAStartup(MAKEWORD(1,1),&wsaData);
1 f5 H2 w2 D3 x7 f" ?; D$ D$ h
5 w  [5 E" n" t' c3 i& g3 wif ( hEnum )
$ T' A' t% c6 d4 ]9 w) O) T{. x0 J4 l/ E+ U. x& e
DWORD Count = 0xFFFFFFFF;: W0 @, K0 C: k; [
DWORD BufferSize = 2048;
# I2 C( ]- }% k. P( e0 c7 u LPVOID Buffer = new char[2048];
) ~+ h% Q! s' Q/ U- h) t1 ] WNetEnumResource( hEnum, &Count,   Y( M5 V0 i: V3 o( _) P
      Buffer, &BufferSize );
. g/ B$ a# Q4 P5 E NetResource = (NETRESOURCE*)Buffer;8 |  w% C" J+ I: A% r; z( ^7 S. j  V& R
2 F% q7 Z  w# z
char szHostName[200];: Z2 P: O: A" d3 S# u
unsigned int i;2 o' P; m1 b1 S
$ q' }. N( Z0 M4 C4 C
for ( i = 0; 3 }* b' R: c  f5 w' d' L9 v
      i < BufferSize/sizeof(NETRESOURCE);
6 P; {  `. P7 n       i++, NetResource++ )
8 ]. Z% G# S0 P) G3 ~" J! O {
7 T1 ]! _! Z2 N: G* s       if ( NetResource->dwUsage ==
' J  s' m. U& z2 d3 A          RESOURCEUSAGE_CONTAINER && # Y" @* b+ a: H$ o; v! }
         NetResource->dwType ==
! q8 S8 p0 p3 X# h( L          RESOURCETYPE_ANY )/ N, f  p# _4 v
      {
" c7 x( R  N/ H7 S          if ( NetResource->lpRemoteName )
& A9 x& ]$ q$ Y& n          {
5 _, q' U% {" O             CString strFullName = # O' `& X7 O! R" e& I" L
                  NetResource->lpRemoteName;
: `7 B, z; Y& r; L2 P3 L             if ( 0 ==
) H7 L" D4 H9 k6 e' K                   strFullName.Left(2).Compare("\\\\") ) # G  ~$ p( q0 G5 ^1 J* z
                  strFullName = ) }4 l$ Z  f" z& y; D) f3 k7 q! B
                     strFullName.Right(+ o4 a4 [. G- f' a7 A0 L% X
                        strFullName.GetLength()-2);: t$ y8 P" A8 d; j

: h$ D8 J' C0 {7 T! Y& G3 E6 H             gethostname( szHostName, 3 r" ]# |9 s) M' q- A5 x
                  strlen( szHostName ) );
; ?% k3 O$ q! R. B             host = gethostbyname(strFullName);9 q+ f6 w* D0 E% A  V/ p
! q/ h/ G4 E  z. w7 x( X* U
            if(host == NULL) continue; . H. }4 v$ V3 y
            ptr = (struct in_addr *) 5 M6 X- n% e* F  ~
                  host->h_addr_list[0];                   4 ~6 K; S) n  V0 g9 a1 T4 Y& d

9 N5 N. u$ A6 U. s( L/ k, \. I# j; n             // =. 分隔开IP:211.40.35.76.
0 s4 @8 w! }3 @             int a = ptr->S_un.S_un_b.s_b1;  // 211
9 n$ Q  q& [. y, }             int b = ptr->S_un.S_un_b.s_b2;  // 40
% l8 R, M+ o: V0 O1 v             int c = ptr->S_un.S_un_b.s_b3;  // 35
' A2 ]1 k3 G! a- u             int d = ptr->S_un.S_un_b.s_b4;  // 76; Y& f! {$ y! ~7 R) y& W; m

1 k, t! y1 o3 P2 B" ^             strTemp.Format("%s -->  %d.%d.%d.%d",
                  strFullName,a,b,c,d);
, C6 x7 l6 h/ U+ R             AfxMessageBox(strTemp);) ~" \& I, N, C0 i
         }  i, Z/ X6 N4 O
      }; ^. V3 `: s$ w1 n
}6 B/ r/ ?/ ^. v5 \5 o$ c
+ H, H  P7 ~& ]: i
delete Buffer;
5 l  z8 _7 K: c; Z- ^* [ WNetCloseEnum( hEnum );
0 }6 d3 e8 B" d4 l7 {}, k# |7 v# b# e- W/ c3 o9 G

, w% d8 r% O9 L% Q( u! `WSACleanup();

		自动登录	找回密码
密码			注册