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;8 D- _, w! ^0 E2 p
                  }: M2 d0 X6 v; f0 [6 W, k
               * ^4 u9 g' u- p
                  // 修改位图 DirectBitmap  L% a& ^& b! n- U( C7 C  i
                  SelectObject(DirectDC,PreviousObject);
2 K- o) y% u3 N5 i) W
9 t3 G$ q3 W' f' h$ I                   // 完成9 x: y8 o  y! ^! Y* I
                  RetBmp=DirectBitmap;4 I+ `' {+ I# o! }& G7 w1 |& T
            }$ ]( v& j- j; K! {  _
            // 释放DC: |: D/ P% f" J( @7 W* Q" p' S# h
            DeleteDC(DirectDC);' E7 r, m% i3 i0 a7 b
         }7 @# y8 D% M7 }8 s
         // 释放DC% V# \+ z$ i8 }8 J
         DeleteDC(BufferDC);+ j$ Q/ M* C# ]9 ^# }: B9 w" f
      }; |4 _3 q$ \, ?- @: u) K
}. ?' }/ \6 E- g, s; N7 m* p  F
return RetBmp;
. [1 K# D5 B6 f. T4 F}
8 Z& w' o: v/ e. t% \
7 E# J5 Z# \* x3 ~+ j; s; C  n6 q' Q; k9 T- a5 m
用法：+ C+ n& U1 w+ E4 |9 c
$ a" Q- x* [' S
HBITMAP hBmp2 = LoadBitmap(g_hinstance,MAKEINTRESOURCE(IDB_SAMPLEBITMAP));
  L5 h' k$ F# Q! W" o- {3 ]0 |( PHBITMAP hBmp = ReplaceColor(hBmp2,0xff0000,0x00ff00); // 替换蓝色为绿色; G7 b. n6 n( t* z) W! `7 z( P
......  @( {9 e7 V3 c" y- t+ w
  `, k0 e; R. `; Y& D) t
DeleteObject(hBmp2);% t+ V" a9 f& B1 k) \$ ]
DeleteObject(hBmp);
0 P9 r( c$ |( m/ |: N" f; c' Q( q5 U2 J: G
( B* p# x4 p6 q& L3 @/ Z
19. 如何转换并保存位图9 Z' \+ z8 S7 |9 R
3 r6 O; `0 l, E( k$ Z
//********************************************************************************4 x9 l7 Y& \4 f( n0 Q
//* 名称：DDBToDIB
* q: Y( U! v" g+ Y//* 作者：徐景周(jingzhou_xu@163.net)
# K" A- p: K; T% ~//* 功能：设备相关转换为设备无关位图
8 S5 Q4 b! H- j$ e//********************************************************************************
0 u1 Y0 ]* h" ~6 w6 s4 n2 j0 W: ~8 p+ ?5 v/ Z) }# [0 Z) W. g
HANDLE CScreenSnapDlg::DDBToDIB( CBitmap& bitmap, DWORD dwCompression /* = BI_RGB */)
. x  @) ]3 U) Y{
% Y7 V% v) x6 F; b4 P BITMAP             bm;
  u6 z5 J( z6 p. C BITMAPINFOHEADER bi;2 M" Q$ I2 Y+ A6 T7 }6 h6 `( ]5 r; k
LPBITMAPINFOHEADER  lpbi;
, |: ^2 q# }* I) V4 q DWORD             dwLen;  x& L. T+ i1 I9 K) d2 D
HANDLE             hDIB;' |0 J5 T0 o: E* e& [) [
HANDLE             handle;# B  o* [) Q6 M4 o+ }4 |% t) a
HDC                   hDC;' ~" T5 s3 _: X" c* s" O0 [
HPALETTE          hPal;5 {5 K  t6 R2 u2 M( ^

7 P. [% @/ |# R; W2 e CWindowDC          dc( this );- u& z  s. O% f* K+ a
CPalette          pal;
" A6 a+ t1 D, i1 X8 X //如果支持调色板的话，则建立它; F0 b" W% j8 w& L5 D# Q
if( dc.GetDeviceCaps( RASTERCAPS ) & RC_PALETTE )
8 Q1 c7 w+ r9 w2 b4 U {
  y( Z" E/ e' u' q- s" C       UINT       nSize = sizeof(LOGPALETTE) + ( sizeof(PALETTEENTRY) * 256 );/ v7 q. O6 ~2 B! C. q5 F1 G
      LOGPALETTE* pLP    = (LOGPALETTE*)new BYTE[nSize];( a: e$ ]% }: c+ `5 v# q
      pLP->palVersion    = 0x300;% r8 L2 t7 _; v! X6 Z% U
      pLP->palNumEntries = (unsigned short)GetSystemPaletteEntries( dc, 0, 255,
4 n+ H# k! U# G' \7 F! o       pLP->palPalEntry );2 ^' m8 ?* [, _8 \5 R9 i2 l' Q) }) I

% L  Z6 t' P% Q+ e$ t$ Y# {       pal.CreatePalette( pLP );+ u$ F4 c( ~8 I2 u7 Q

' @0 I& J, u( p6 [; O2 Z       //释放; i! B6 r* D1 ~. z5 G
      delete[] pLP;, d; d1 S) y6 T4 d
}* Z' x' z# f3 X2 z9 ~/ w  _% t

. V/ ^& A+ M% i3 H ASSERT( bitmap.GetSafeHandle() );5 w6 D, @3 F9 b* P+ f& l7 I. t

8 V; D, c1 r7 N
: ~' ^0 ~+ X1 Q# B" m! ^7 |6 c! J //不支持BI_BITFIELDS类型
5 g) n' _% [5 S1 Z if( dwCompression == BI_BITFIELDS )
8 T1 U/ G; G" |  k7 s       return NULL;  n/ B7 s( T. S7 q

* T# |* w0 ]9 |/ f //如果调色板为空，则用默认调色板
5 {/ ]) x7 j+ F- j; D/ r hPal = (HPALETTE) pal.GetSafeHandle();3 m- |) E; T* q' m- X
if (hPal==NULL)
" m# n5 q8 }9 }3 g4 s7 |0 K       hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE);: l: x; g3 v7 |6 G/ L1 R* N* S. P

  a% Y7 E& e. O" X //获取位图信息2 u/ W" y/ G- G0 G$ m9 {/ w
bitmap.GetObject(sizeof(bm),(LPSTR)&bm);6 f# |3 G6 M& \
' c" s" B! H7 \' p1 f- c
//初始化位图信息头, }, R! k( t% b" S* `5 y
bi.biSize       = sizeof(BITMAPINFOHEADER);
0 y  w3 }# g% i$ N bi.biWidth       = bm.bmWidth;9 ?6 f1 V5 S* F. L' p8 Q) [( Y' q) P
bi.biHeight       = bm.bmHeight;
bi.biPlanes       = 1;5 K3 g- m* }  l
bi.biBitCount       = (unsigned short)(bm.bmPlanes * bm.bmBitsPixel) ;
1 \2 e2 Y2 j: s, G. N. u( k% H! g% P bi.biCompression = dwCompression;
# a" L$ x, i& H bi.biSizeImage       = 0;# h; y/ M  d4 X
bi.biXPelsPerMeter = 0;  c/ y* j6 \, |7 D. N- i. d
bi.biYPelsPerMeter = 0;
, w# L" J. o) d$ X bi.biClrUsed       = 0;/ @9 M' L6 L4 g
bi.biClrImportant = 0;
" {* L2 y" c( i8 g, ]* H) }# Z. u" V
//计算信息头及颜色表大小
& Z* x% z* l/ }& H int nColors = 0;
2 b9 c! s# c& H6 N* S! [ if(bi.biBitCount <= 8); P3 h8 _6 @9 J, q& j3 H1 `$ x
      {! p) K0 O8 I6 w- ^4 W3 L
      nColors = (1 << bi.biBitCount);+ N  C* A/ d3 I) W& G* O4 Y
      }! g" ^7 L3 }4 m
dwLen  = bi.biSize + nColors * sizeof(RGBQUAD);
- Q: ^; h+ }1 w- @* Q/ L- r
6 C' n3 T4 W# e hDC = ::GetDC(NULL);& w' u3 ]4 i0 f( l
hPal = SelectPalette(hDC,hPal,FALSE);/ ^% I5 b" I( B+ L
RealizePalette(hDC);
7 n" U4 K, p% c* y9 j9 U* \8 P$ z3 T+ e5 H* t
//为信息头及颜色表分配内存
, u9 b/ c7 P- R0 W8 {8 c! I8 M hDIB = GlobalAlloc(GMEM_FIXED,dwLen);" o% n9 [. U! O$ b1 H; j+ t. M/ F$ B
if (!hDIB){
+ o7 c6 H9 Z, w       SelectPalette(hDC,hPal,FALSE);
5 t0 S. C; w; D2 e1 F       ::ReleaseDC(NULL,hDC);
, j2 S6 T, ~- G$ I! O; ~3 V4 U' N       return NULL;$ V' o: f4 V: o+ y6 Z: }8 y
}
4 C1 w" f0 f9 M
) O" }9 p! V; W9 Z* w lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);$ B! z5 A( Y6 R' K$ y
*lpbi = bi;
: J$ A2 ?# R+ s0 \. ?9 H) k1 @* D! B; y1 t5 ?- R
//调用 GetDIBits 计算图像大小: E. ?% y' H! Q+ v" s/ d
GetDIBits(hDC, (HBITMAP)bitmap.GetSafeHandle(), 0L, (DWORD)bi.biHeight,
2 F) a5 M+ J* P9 n          (LPBYTE)NULL, (LPBITMAPINFO)lpbi, (DWORD)DIB_RGB_COLORS);/ C( V7 a. A" A

+ ^% @; n: U% i bi = *lpbi;* @& Q) Q, n8 m/ k! f

3 J- ?! P' |1 d: ~) ^# t% B% _ //图像的每一行都对齐(32bit)边界
: w; ~# [% ]' j8 r( G# X5 w if (bi.biSizeImage == 0){
( B$ }+ c' `. k       bi.biSizeImage = ((((bi.biWidth * bi.biBitCount) + 31) & ~31) / 8) 4 D* e! ^  o3 T9 W8 G" `( k% b
                     * bi.biHeight;1 \$ T7 K/ @$ N$ C/ L$ F$ }6 C2 Z
      if (dwCompression != BI_RGB)5 |; h# o* x+ c8 _0 y. R. |% q
         bi.biSizeImage = (bi.biSizeImage * 3) / 2;
0 M5 u+ N* z/ R9 C }
# q* ^! d; w; l: z //重新分配内存大小，以便放下所有数据
; d: b- N) P* F- B2 O dwLen += bi.biSizeImage;
  d, Z9 h  ]* F1 t% S2 V handle = GlobalReAlloc(hDIB, dwLen, GMEM_MOVEABLE) ;
1 n, O. l% e& W' U6 F if (handle != NULL)2 s2 K: ^9 T9 S6 ^. ^4 C7 ~8 t9 Y. t1 L
      hDIB = handle;
9 ^4 \9 d5 O$ v% }: @ else
0 d( k, m+ J" w/ O: L  o       {
; y6 x! p% P4 F+ [       GlobalFree(hDIB);
7 \) d& b& d: j* k  k9 l0 @. d6 Z1 S" R$ u5 O
      //重选原始调色板
6 n' Z7 Y9 Q: W8 p' _' l       SelectPalette(hDC,hPal,FALSE);
/ @- q2 g0 ~0 B4 a       ::ReleaseDC(NULL,hDC);
9 z0 N2 `# ]; c+ D4 i; a       return NULL;
" E. r& S& m9 c6 y. _/ m       }, c+ m2 X. S. i
//获取位图数据4 g7 K: J5 |, s% a
lpbi = (LPBITMAPINFOHEADER)hDIB;# V# f' {. G5 R: p+ Q
//最终获得的DIB
8 X0 R8 V7 b  |  C BOOL bGotBits = GetDIBits( hDC, (HBITMAP)bitmap.GetSafeHandle(),! K2 r  j4 C" I$ H  g
            0L,                   //扫描行起始处
+ ]$ m+ H8 G8 B3 A0 [) |  u: F! I             (DWORD)bi.biHeight,    //扫描行数
( |; u  n7 V- I             (LPBYTE)lpbi          //位图数据地址
: }) o/ k0 S# d" A5 P+ g             + (bi.biSize + nColors * sizeof(RGBQUAD)),
' Y9 |! I% B' t2 z: u             (LPBITMAPINFO)lpbi,    //位图信息地址! O8 v3 B. [3 b8 \
            (DWORD)DIB_RGB_COLORS);  //颜色板使用RGB
. l7 f: S$ n# J6 j, u8 E if( !bGotBits )
: ]7 S) o3 ]: l) @: I6 s {
( M+ @! a# D. h$ I       GlobalFree(hDIB);
. }1 S" `1 q2 T: m       SelectPalette(hDC,hPal,FALSE);8 m. ?& s! K- Q2 S# w  p
      ::ReleaseDC(NULL,hDC);
9 q0 P* Y/ X. i7 x: a       return NULL;0 v4 M' X$ g7 I& M5 i
}
" M0 S/ Y/ b6 W5 x( u' u SelectPalette(hDC,hPal,FALSE);
% i' y6 |* `5 H0 }7 s. b9 Y ::ReleaseDC(NULL,hDC);
& Z, E5 P  M4 i% K7 z8 n return hDIB;
( i1 N" w  V4 ^$ w/ z) v* i}
1 m' Y" r( M  g" T# z
* I1 ^. W5 B/ _0 n2 d4 ~" I1 P/ W' O7 _2 G) u
//********************************************************************************0 f$ F3 D4 N5 r' H" e
//* 名称：SaveBitmapToFile
2 U3 j4 k( H0 S9 ^' u//* 修改：徐景周(jingzhou_xu@163.net)9 g& B  A( E! |
//* 功能：保存为位图文件
0 Z2 {0 h/ y5 Z( W5 H* B//********************************************************************************
* {, [- s4 O9 ?. @  }/ j  ]BOOL CScreenSnapDlg::SaveBitmapToFile(HBITMAP hBitmap , CString lpFileName)
8 _3 N1 m7 c# [! B6 P{
* g" m% E6 |5 b- ?' s" [0 g; b% F HDC             hDC;                         //设备描述表  ) V7 d. k$ k0 j; {9 W) X$ i
int             iBits;                         //当前显示分辨率下每个像素所占字节数, H6 H5 Z6 [% Y1 F3 J4 V& B9 v
WORD          wBitCount;                      //位图中每个像素所占字节数+ L$ t! \  o  v# V3 u
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
& a: `* A4 J  Q$ H4 X! ~! Q4 O2 w                   dwBmBitsSize,
! ^2 z  B) f' H' v                   dwDIBSize, dwWritten;5 {8 {% }, _3 T: w: H
BITMAP       Bitmap;
5 ]) C8 k3 c7 k9 s4 Z BITMAPFILEHEADER bmfHdr;                      //位图属性结构
! L: A# n! x1 n2 F( A: j( b BITMAPINFOHEADER bi;                         //位图文件头结构
2 F/ U# l, ~. k0 w& K% r- Y+ @% Q LPBITMAPINFOHEADER lpbi;                      //位图信息头结构    / W, j4 \; R. a% D) ?) y/ O2 a

7 R, J2 F5 E5 g: i: K6 [ 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
* ~# {) I& y# G4 C
' _- |4 S& {5 [3 Q) V$ i  o
- m) y- g  e5 `- ~: S. d! f //计算位图文件每个像素所占字节数
( {& f9 I, d' q) t. ~ hDC = CreateDC("DISPLAY",NULL,NULL,NULL);  `+ O2 z. G$ w% J. e
iBits = GetDeviceCaps(hDC, BITSPIXEL) *
0 n3 i4 h7 A1 [+ |! l1 I GetDeviceCaps(hDC, PLANES);" y+ g- \- l$ S7 q) K
DeleteDC(hDC);
, `& w: L+ K. j& l- _ if (iBits <= 1)' r$ b) k& A1 U1 e& v2 a
   wBitCount = 1;* q5 w( Y2 C+ a- a' P3 E
else if (iBits <= 4)
! H" G8 ~7 F6 r( O3 h9 {! N5 l5 Y    wBitCount = 4;
) U0 }/ n- g# _7 b' {/ F' W4 s4 u else if (iBits <= 8): A3 k+ s7 h5 L4 y8 [4 h* l: _' j  j* i
   wBitCount = 8;
; T- w# @" Y6 B( c& z2 u/ c else if (iBits <= 24)
8 Z7 S1 t: ^* }6 G' \! X    wBitCount = 24;
0 H% F# h9 b3 Z0 G* H% d( t' Q/ d) b. G, V  U) ~: F5 K4 w
//计算调色板大小- _2 `8 y; J/ s, q
if (wBitCount <= 8)( i0 G, n& p$ I7 v* N* V# W
   dwPaletteSize = (1 << wBitCount) *sizeof(RGBQUAD);! z! _5 k) i( K5 {9 a% W

3 t( }2 C! G8 ~ //设置位图信息头结构
6 j, m; f  R. V& j/ K GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
2 P  T- S9 @5 p7 S, w bi.biSize          = sizeof(BITMAPINFOHEADER);1 |" G: \! K. Q! L- @% @
bi.biWidth          = Bitmap.bmWidth;# n& D$ W5 m; E' ]8 e
bi.biHeight       = Bitmap.bmHeight;
6 I8 S% W( R9 _: V8 w4 s bi.biPlanes       = 1;; O) B; R( j$ y. R7 _; E1 i
bi.biBitCount       = wBitCount;( ~" x4 K8 h7 D6 h  P
bi.biCompression    = BI_RGB;
" d. ~# x  Z# j' E. D bi.biSizeImage       = 0;
' U6 C9 O& c: E$ L bi.biXPelsPerMeter    = 0;
) z" J* X, c: G- j# r bi.biYPelsPerMeter    = 0;6 R. a5 y' H! e5 a. u* Y- j8 z4 A$ Z% S
bi.biClrUsed       = 0;; d0 R3 x' n; L1 A
bi.biClrImportant    = 0;
2 G4 p, @7 x; R. ^/ y3 G6 g2 c) c dwBmBitsSize = ((Bitmap.bmWidth *0 B) t! g5 |( o# m
wBitCount+31)/32)* 4
& O/ n3 M7 ?2 J# A    *Bitmap.bmHeight ;
+ Z. c% S2 E; i) j1 h
/ k# k8 R/ ]  F$ m8 M* H- E5 a //为位图内容分配内存
6 l+ ~# Z0 B( v* V7 k; r6 x' C hDib  = GlobalAlloc(GHND,dwBmBitsSize+
( t3 o  i8 u! @9 | dwPaletteSize+sizeof(BITMAPINFOHEADER));' f, R6 N3 n- m1 w7 [
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
, U& a: u% A1 D( x. D7 u *lpbi = bi;
7 N  T# d' a2 G2 V. x/ ~7 G
8 `/ c) Z1 R  P/ ~9 z7 s" |( ] // 处理调色板
9 `0 s7 f- @3 C. }- @8 y& ^ hPal = GetStockObject(DEFAULT_PALETTE);7 W  C- ^/ U8 E3 O8 D
if (hPal); k( \* Q1 C" t. Z
{
+ r! `/ v( s+ T) i- b5 C5 h, P    hDC  = ::GetDC(NULL);& b( e/ @4 E* A$ b) Z8 g1 }% @: L
   hOldPal = SelectPalette(hDC, (HPALETTE)hPal, FALSE);$ G/ B* j) C) F4 V
   RealizePalette(hDC);5 D- w- X7 u+ U- D6 M+ o
}) o" X5 \3 X: g0 g- ^( [& e- ]) ^" Z
  I. n2 L3 `7 |* A$ w  L7 G" o% H8 H
  // 获取该调色板下新的像素值6 D; i0 ^: y" D! ~- `! ~% J
GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight,
3 Y1 ]5 ~& c+ y" }    (LPSTR)lpbi + sizeof(BITMAPINFOHEADER)+dwPaletteSize,
" s- U9 @5 s  z1 e7 T    (LPBITMAPINFO)lpbi, DIB_RGB_COLORS);
( M6 {1 R# I9 j- l' D2 ]
$ ~9 I1 z, @- \& |( S! r  //恢复调色板 6 X8 h5 P6 `0 p" x7 x
if (hOldPal)
$ v. G$ Z5 u' L5 R {- _/ U8 {$ ^8 ~3 q8 z1 K; e
   SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);+ M5 {! L# d8 g9 {
   RealizePalette(hDC);! W( a4 `1 k/ }
   ::ReleaseDC(NULL, hDC);
  }2 ?! Q$ V& ?+ F8 G }
5 Q6 q( \3 M( G2 c3 x
& N/ ^( D  E, v$ y //创建位图文件
2 Q( F0 F8 {. l9 |+ H; d" W* f: _ fh = CreateFile(lpFileName, GENERIC_WRITE, * D$ G7 P" d* [5 Y. X; u& [) d
      0, NULL, CREATE_ALWAYS,8 K$ r; @' x. b, w, ?
      FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
( d3 p4 \0 }' k; W2 w* W: a: j1 F if (fh == INVALID_HANDLE_VALUE)
) B" ?( o2 f6 ~) X    return FALSE;* b- ~. y7 T: j) Z+ u+ _
0 e" y- K7 |+ @' R7 A: I
// 设置位图文件头
* g8 w/ @5 [' x# ?& A bmfHdr.bfType = 0x4D42;  // "BM"
* C1 \; d% @4 f dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dwPaletteSize + dwBmBitsSize;  8 h, ~# x; f; V! @
bmfHdr.bfSize = dwDIBSize;
3 ]( K8 ]( l  p# U bmfHdr.bfReserved1 = 0;. Z' l$ N6 B, w/ h) A
bmfHdr.bfReserved2 = 0;  H0 F/ X# {4 G4 h" k
bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)
8 T1 g& x, J( }7 s9 a* p    + (DWORD)sizeof(BITMAPINFOHEADER)! x& k' H, j- S* p
   + dwPaletteSize;* m. B5 l" n3 c' b  E
2 {4 c, I1 h+ a4 a& I

; f9 [, T4 E" y4 u5 t // 写入位图文件头
4 v: U) {) {7 i WriteFile(fh, (LPSTR)&bmfHdr, sizeof
& W8 a8 L/ t* T  ?, d' p" ` (BITMAPFILEHEADER), &dwWritten, NULL);! G& G2 e+ h: x% q, b4 j
; h2 }* D3 y1 B. t
// 写入位图文件其余内容
2 i0 w' i* y5 I/ E WriteFile(fh, (LPSTR)lpbi, dwDIBSize,
&dwWritten, NULL);1 m+ \4 Y& j( z& L" O0 }! ]) ?

+ Q. s. I4 {. Q; p# t //消除内存分配
9 O, x2 ~  D% w: x- T( z GlobalUnlock(hDib);
, X- E: ^: R- O# d- }: Q+ H GlobalFree(hDib);3 K0 n& D5 A* G9 }0 v
CloseHandle(fh);1 k1 L% e( G% o, m% _6 o7 k, K0 j

- G/ D6 X8 P9 L# y return TRUE;
' [, J4 [4 e9 t, s  y  z}
9 X% o8 R1 Q3 ]8 w, u/ c, ?, H
9 f% W( _; v) c
8 q3 X) B; n% I7 `) L20. 如何获取局域网上计算机名及它们的IP地址
, y# {/ i% A) o6 K4 z9 E2 Z. e: t) X
l 连接ws2_32.lib和 mpr.lib库
- v7 x8 q! j3 t! e3 ^* |  L5 S! j% `, O+ ^- K5 z) O
l #include winsock2.h
% _" K' z& M1 [1 _& K1 l$ b2 |7 _' o- K, Z, v1 b
CString strTemp;0 B' b6 K! Y) R% ]4 Z4 {' O
struct hostent *host;& |. O! S8 M  q
  X8 w6 v" P5 s
struct in_addr *ptr; // 检索IP地址 & `- F# ^# g( A! ?2 v0 t
DWORD dwScope = RESOURCE_CONTEXT;
. J4 q# V/ x  g" p$ T- PNETRESOURCE *NetResource = NULL;
4 E( x, W, |! [9 Q) ]6 ~/ MHANDLE hEnum;
' o/ K, }+ Y7 ZWNetOpenEnum( dwScope, NULL, NULL, ( l5 |8 V  X& C3 ~$ v9 n
         NULL, &hEnum );8 Q2 |, W: s' y
: `2 W2 T, `( }  R3 |& ]
WSADATA wsaData;( L4 O* @4 j+ i; [
WSAStartup(MAKEWORD(1,1),&wsaData);& Q- \9 G1 H# O2 }& x5 i1 G
2 N& g' p8 w, Y* p% E; e
if ( hEnum ); _; e* w5 u' y% j5 c
{
, Y* Z1 O2 m. t8 `1 P9 j DWORD Count = 0xFFFFFFFF;
5 M8 g' h" Y. ^4 W DWORD BufferSize = 2048;4 s; c# f9 q% z! x* K& S. [; P) H: z
LPVOID Buffer = new char[2048];  Z9 [6 k- J( E5 T/ ~; l' m  y
WNetEnumResource( hEnum, &Count, , a' {, B) M$ x# l
      Buffer, &BufferSize );
1 }! e; G: q( _( V NetResource = (NETRESOURCE*)Buffer;
, G2 u- C8 W$ o; n6 J; B
( I7 j  X. k4 q5 O& V0 a6 q% m8 F; J char szHostName[200];% N) D5 G  S1 V. j3 ?) M5 @
unsigned int i;
9 y! ?8 r' N4 z+ z" I9 s8 a
; q7 u3 ?! ]. y5 `" d& b" w% t% D for ( i = 0;
# j0 b9 ~8 l3 U: h8 m7 X       i < BufferSize/sizeof(NETRESOURCE);
3 u; i6 C. G4 T- o       i++, NetResource++ )0 a  |) i. e  K/ ]6 E6 b+ F
{
$ _( G3 w+ v  Z' F" U       if ( NetResource->dwUsage == / V0 D$ U9 R1 }
         RESOURCEUSAGE_CONTAINER &&
8 W% Q4 L7 o* J* [' p. R% z          NetResource->dwType ==
6 t. ?7 C+ f( Q. I( {- g" f% X          RESOURCETYPE_ANY )
4 B7 S( m% C1 V& W8 V       {
3 T% t% M, @0 f5 F  X' U% i8 s          if ( NetResource->lpRemoteName )4 h( o7 ~7 H8 k% E5 O* O- s3 M
         {6 |8 e, m" T, h5 |9 B; V: W1 _; t
            CString strFullName =
* j8 _- ]% B: K# Z% ?5 J                   NetResource->lpRemoteName;
% _. x* @- L& U1 b. N8 T* W: I             if ( 0 ==
: R6 y( S( e- }/ ?# z1 f9 Z                   strFullName.Left(2).Compare("\\\\") )
& G* u- ?1 O3 @8 z" R6 K& g                   strFullName = 0 W7 ?' x$ c/ |+ d/ y
                     strFullName.Right(
: y" ?- w, l' V' P  c                         strFullName.GetLength()-2);0 _6 U4 ~' [/ X) V* \
  W$ ]8 |7 b- N  [8 H! ?2 ^
            gethostname( szHostName,
0 J- d6 D% R9 @9 n% k; s                   strlen( szHostName ) );* k0 H3 l  K4 _1 b# X
            host = gethostbyname(strFullName);
' S6 y  F! `8 O1 w
# U/ J7 o5 k/ |6 L" U+ b) W             if(host == NULL) continue; 7 J: o; F4 ^. Z# k! D! c
            ptr = (struct in_addr *)
* K& E* ~; r" c. t                   host->h_addr_list[0];                   . v  K1 ?) y5 V* m  [/ g
1 d  P% n2 |& ~3 t
            // =. 分隔开IP:211.40.35.76.
, d# X3 F. W/ m+ G; B$ T4 M             int a = ptr->S_un.S_un_b.s_b1;  // 211
6 t1 R/ Q1 x5 Z9 F* @% S" O" B0 E             int b = ptr->S_un.S_un_b.s_b2;  // 40
8 Y4 z# o& ]0 h/ u$ M; f: C             int c = ptr->S_un.S_un_b.s_b3;  // 35
: H* b. s  C6 c* l  I6 _1 M" h             int d = ptr->S_un.S_un_b.s_b4;  // 76
; J1 w: ?/ i* A' I  l* v
' X! d. x! d  _             strTemp.Format("%s -->  %d.%d.%d.%d",) ?( R7 D' a) P( i% _6 X/ @
                  strFullName,a,b,c,d);  H( J' {3 z, f; E7 H" Z, @- r6 ]4 B! O
            AfxMessageBox(strTemp);
0 g  I: E5 \5 y+ m, s& q          }* ^( ]7 f1 X0 u$ w, q# \5 t
      }
7 T3 D5 Z% d9 h2 q& X }& v8 g) w9 c2 U& K& P
% K, y! k7 U0 F. `% z3 K
delete Buffer;
& ^* v: k* F3 T' }6 ^3 d WNetCloseEnum( hEnum ); - Y1 w: s. F2 a( s
}
; ?) v+ Q3 P$ T8 Y# h5 m/ B2 c! h4 v9 c$ f
WSACleanup();

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