vc++如何将客户区存为bmp和VC实现自绘图形输出到bmp文件

vc++如何将客户区存为bmp

在view类中添加以下三个函数：

BOOL CTestestView::WriteWindowToDIB(LPTSTR szFile, CWnd *pWnd)

{

       CBitmap bitmap;

       CWindowDC dc(pWnd);

       CDC memDC;

       CRect rect;

       memDC.CreateCompatibleDC(&dc);

       pWnd->GetWindowRect(rect);

       bitmap.CreateCompatibleBitmap(&dc,rect.Width(),rect.Height());

       CBitmap* pOldBitmap=memDC.SelectObject(&bitmap);

       memDC.BitBlt(0,0,rect.Width(),rect.Height(),&dc,0,0,SRCCOPY);

       CPalette pal;

       if(dc.GetDeviceCaps(RASTERCAPS)&RC_PALETTE)

       {

              UINT nSize=sizeof(LOGPALETTE)+(sizeof(PALETTEENTRY)*256);

              LOGPALETTE* pLP=(LOGPALETTE*)new BYTE[nSize];

              pLP->palVersion=0x300;

              pLP->palNumEntries=GetSystemPaletteEntries(dc,0,255,pLP->palPalEntry);

              pal.CreatePalette(pLP);

              delete[] pLP;

       }

       memDC.SelectObject(pOldBitmap);

       HANDLE hDIB=DDBToDIB(bitmap,BI_RGB,&pal);

       if(hDIB==NULL)

              return FALSE;

       WriteDIB(szFile,hDIB);

       GlobalFree(hDIB);

       return TRUE;

}

HANDLE CTestestView::DDBToDIB(CBitmap &bitmap, DWORD dwCompression, CPalette *pPal)

{

       BITMAP bm;

       BITMAPINFOHEADER bi;

       LPBITMAPINFOHEADER lpbi;

       DWORD dwLen;

       HANDLE hDIB;

       HANDLE handle;

       HDC hDC;

       HPALETTE hPal;

       ASSERT(bitmap.GetSafeHandle());

       if(dwCompression==BI_BITFIELDS)

              return NULL;

       hPal=(HPALETTE)pPal->GetSafeHandle();

       if(hPal==NULL)

              hPal=(HPALETTE)GetStockObject(DEFAULT_PALETTE);

       bitmap.GetObject(sizeof(bm),(LPSTR)&bm);

       bi.biSize=sizeof(BITMAPINFOHEADER);

       bi.biWidth=bm.bmWidth;

       bi.biHeight=bm.bmHeight;

       bi.biPlanes=1;

       bi.biBitCount=bm.bmPlanes*bm.bmBitsPixel;

       bi.biCompression=dwCompression;

       bi.biSizeImage=0;

       bi.biXPelsPerMeter=0;

       bi.biYPelsPerMeter=0;

       bi.biClrImportant=0;

       bi.biClrUsed=0;

       int nColors=(1<<bi.biBitCount);

       if(nColors>256)

              nColors=0;

       dwLen=bi.biSize+nColors*sizeof(RGBQUAD);

       hDC=::GetDC(NULL);

       hPal=SelectPalette(hDC,hPal,FALSE);

       RealizePalette(hDC);

       hDIB=GlobalAlloc(GMEM_FIXED,dwLen);

       if(!hDIB)

       {

              SelectPalette(hDC,hPal,FALSE);

                     ::ReleaseDC(NULL,hDC);

              return NULL;

       }

       lpbi=(LPBITMAPINFOHEADER)hDIB;

       *lpbi=bi;

       GetDIBits(hDC,(HBITMAP)bitmap.GetSafeHandle(),0L,(DWORD)bi.biHeight,(LPBYTE)NULL,(LPBITMAPINFO)lpbi,(DWORD)DIB_RGB_COLORS);

       bi=*lpbi;

       if(bi.biSizeImage==0)

       {

              bi.biSizeImage=((((bi.biWidth*bi.biBitCount)+31)& ~31)/8)*bi.biHeight;

              if(dwCompression!=BI_RGB)

                     bi.biSizeImage=(bi.biSizeImage*3)/2;

       }

       dwLen+=bi.biSizeImage;

       if(handle=GlobalReAlloc(hDIB,dwLen,GMEM_MOVEABLE))

              hDIB=handle;

       else

       {

              GlobalFree(hDIB);

              SelectPalette(hDC,hPal,FALSE);

              ::ReleaseDC(NULL,hDC);

              return NULL;

       }

       lpbi=(LPBITMAPINFOHEADER)hDIB;

       BOOL bGotBits=GetDIBits(hDC,(HBITMAP)bitmap.GetSafeHandle(),0L,(DWORD)bi.biHeight,(LPBYTE)lpbi+(bi.biSize+nColors*sizeof(RGBQUAD)),

              (LPBITMAPINFO)lpbi,(DWORD)DIB_RGB_COLORS);

       if(!bGotBits)

       {

              GlobalFree(hDIB);

              SelectPalette(hDC,hPal,FALSE);

              ::ReleaseDC(NULL,hDC);

              return NULL;

       }

       SelectPalette(hDC,hPal,FALSE);

       ::ReleaseDC(NULL,hDC);

       return hDIB;

}

BOOL CTestestView::WriteDIB(LPTSTR szFile, HANDLE hDIB)

{

       BITMAPFILEHEADER hdr;

       LPBITMAPINFOHEADER lpbi;

       if(!hDIB)

              return FALSE;

       CFile file;

       if(!file.Open(szFile,CFile::modeWrite|CFile::modeCreate))

              return FALSE;

       lpbi=(LPBITMAPINFOHEADER)hDIB;

       int nColors=1<<lpbi->biBitCount;

       hdr.bfType=((WORD)('M'<<8)|'B');

       hdr.bfSize=::GlobalSize(hDIB)+sizeof(hdr);

       hdr.bfReserved1=0;

       hdr.bfReserved2=0;

       hdr.bfOffBits=(DWORD)(sizeof(hdr)+lpbi->biSize+nColors*sizeof(RGBQUAD));

       file.Write(&hdr,sizeof(hdr));

       file.Write(lpbi,GlobalSize(hDIB));

       return TRUE;

}

 在保存时调用函数WriteWindowToDIB（）

void CTestestView::OnFileSave()

{

       // TODO: Add your command handler code here

       WriteWindowToDIB("D://My.bmp",this);    

}

本人测试过,确实直接加上就可以了,但是注意类名要改为和你的一致的

转载声明： 本文转自http://wmnmtm.blog.163.com/blog/static/38245714200963032449/

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VC实现自绘图形输出到bmp文件

在用vc做程序时候，经常需要把输出的文本和图形保存到位图文件，当然可以有现成的控件来实现,但总不能如自己所愿，还是自己动手写吧！如下图：

一、实现方法

　　要把文本和图形保存到位图文件，只要对掌握位图结构有一定的了解，一切都ok呢。先必须要创建内存设备环境，然后内存设备环境创建的DIB区域，别忘了还要创建个CBitmap对象，CBitmap对象必须和DIB区域关联起来，把CBitmap对象选择到当前设备环境，然后在当前设备环境输出文本和图形就可以了。

二、具体实现代码如下

void CTestSaveBmpView::SaveAsBmp(CString filename) {  //定义图形大小  int iWidth = 800;  int iHeight = 600;  int iPixel = 16;  //图形格式参数  LPBITMAPINFO lpbmih = new BITMAPINFO;  lpbmih->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);  lpbmih->bmiHeader.biWidth = iWidth;  lpbmih->bmiHeader.biHeight = iHeight;  lpbmih->bmiHeader.biPlanes = 1;  lpbmih->bmiHeader.biBitCount = iPixel;  lpbmih->bmiHeader.biCompression = BI_RGB;  lpbmih->bmiHeader.biSizeImage = 0;  lpbmih->bmiHeader.biXPelsPerMeter = 0;  lpbmih->bmiHeader.biYPelsPerMeter = 0;  lpbmih->bmiHeader.biClrUsed = 0;  lpbmih->bmiHeader.biClrImportant = 0;  //创建位图数据  HDC hdc,hdcMem;  HBITMAP hBitMap = NULL;  CBitmap *pBitMap = NULL;  CDC *pMemDC = NULL;  BYTE *pBits;  hdc = CreateIC(TEXT("DISPLAY"),NULL,NULL,NULL);  hdcMem = CreateCompatibleDC(hdc);  hBitMap = CreateDIBSection(hdcMem,lpbmih,DIB_PAL_COLORS,(void **)&pBits,NULL,0);  pBitMap = new CBitmap;  pBitMap->Attach(hBitMap);  pMemDC = new CDC;  pMemDC->Attach(hdcMem);  pMemDC->SelectObject(pBitMap);  //  CRect rc(0,0,iWidth,iHeight);  pMemDC->SetBkMode(TRANSPARENT);  //添加自绘图形  DrawCurve(pMemDC,rc);  //保存到文件并创建位图结构  BITMAPFILEHEADER bmfh;  ZeroMemory(&bmfh,sizeof(BITMAPFILEHEADER));  *((char *)&bmfh.bfType) = ''B'';  *(((char *)&bmfh.bfType) + 1) = ''M'';  bmfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);  bmfh.bfSize = bmfh.bfOffBits + (iWidth * iHeight) * iPixel / 8;  TCHAR szBMPFileName[128];  int iBMPBytes = iWidth * iHeight * iPixel / 8;  strcpy(szBMPFileName,filename);  CFile file;  if(file.Open(szBMPFileName,CFile::modeWrite | CFile::modeCreate))  {   file.Write(&bmfh,sizeof(BITMAPFILEHEADER));   file.Write(&(lpbmih->bmiHeader),sizeof(BITMAPINFOHEADER));   file.Write(pBits,iBMPBytes);   file.Close();  }  pMemDC->DeleteDC();  delete pMemDC; pMemDC = NULL;  delete pBitMap; pBitMap = NULL;  delete lpbmih; lpbmih = NULL; }

//输出文本和图形

void CTestSaveBmpView::DrawCurve(CDC *pDC, CRect rcClient) {  //页面背景色  CBrush brushCtl;  brushCtl.CreateSolidBrush(RGB(255,255,255));  pDC->Rectangle(rcClient);  pDC->FillRect(rcClient,&brushCtl) ;  brushCtl.DeleteObject();  CPen pen;  pen.CreatePen(PS_SOLID, 1, RGB(255,0,0));  CPen *oldPen = pDC->SelectObject(&pen);  double xMin = 10.00f, xMax = 100.00f;  double yMin = 10.00f, yMax = 200.00f;  double dbX1 = (xMax- xMin)/100 + xMin;  double dbY1 = 600/dbX1 ;  for (int i=1; i<100; i++) //曲线  {   double dbX2 = (xMax- xMin)*i/100 + xMin;   double dbY2 = 600/dbX2 ;   pDC->MoveTo(int(rcClient.left+(dbX1 - xMin)*rcClient.Width()/(xMax- xMin)),    int(rcClient.bottom-(dbY1- yMin)*rcClient.Height()/(yMax- yMin)));   pDC->LineTo(int(rcClient.left+(dbX2 - xMin)*rcClient.Width()/(xMax- xMin)),    int(rcClient.bottom-(dbY2- yMin)*rcClient.Height()/(yMax- yMin)));   dbX1=dbX2;   dbY1=dbY2;  }  pDC->SelectObject(oldPen);  pen.DeleteObject();  oldPen = NULL; }

//保存的实现 void CTestSaveBmpView::OnRButtonDown(UINT nFlags, CPoint point) {  CFileDialog dlg(false,NULL,NULL,OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,   "位图文件(*.bmp)|*.bmp|",   NULL);  if (dlg.DoModal()!= IDOK) return;  CString filename = dlg.GetFileName() + ".bmp";  SaveAsBmp(filename);  CView::OnRButtonDown(nFlags, point); }

转载声明： 本文转自http://wmnmtm.blog.163.com/blog/static/38245714200963005616282/

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