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<p class="style7"><SPAN class=style1>用VC实现将自绘图形输出为bmp文件</SPAN></p>
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发布时间：2005-3-30 被阅览数：<SCRIPT src="../../counter.asp?id=472"></SCRIPT> 次 作者：江上飞鸟
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<td width="100%"><p class="style6"><FONT size=3> 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： <BR><BR></FONT>
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<DIV align=center><IMG style="WIDTH: 488px; HEIGHT: 352px" height=331 onerror="this.src='/Article/UploadFiles/200502/20050209015520804.gif';" hspace=3 src="http://www.77169.org/Article/UploadFiles/200502/20050209015521441.gif" width=456 align=center vspace=1 border=1 orig_onmouseout="null" orig_onmouseover="null"></DIV></TD></TR></TBODY></TABLE><BR> 一、实现方法<BR><BR> 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。<BR><BR> 二、具体实现代码如下 <BR><BR>
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<TD>void CTestSaveBmpView::SaveAsBmp(CString filename)<BR>{<BR> //定义图形大小<BR> int iWidth = 800;<BR> int iHeight = 600;<BR> int iPixel = 16;<BR> //图形格式参数<BR> LPBITMAPINFO lpbmih = new BITMAPINFO;<BR> lpbmih->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);<BR> lpbmih->bmiHeader.biWidth = iWidth;<BR> lpbmih->bmiHeader.biHeight = iHeight;<BR> lpbmih->bmiHeader.biPlanes = 1;<BR> lpbmih->bmiHeader.biBitCount = iPixel;<BR> lpbmih->bmiHeader.biCompression = BI_RGB;<BR> lpbmih->bmiHeader.biSizeImage = 0;<BR> lpbmih->bmiHeader.biXPelsPerMeter = 0;<BR> lpbmih->bmiHeader.biYPelsPerMeter = 0;<BR> lpbmih->bmiHeader.biClrUsed = 0;<BR> lpbmih->bmiHeader.biClrImportant = 0;<BR><BR> //创建位图数据<BR> HDC hdc,hdcMem;<BR> HBITMAP hBitMap = NULL;<BR> CBitmap *pBitMap = NULL;<BR> CDC *pMemDC = NULL;<BR> BYTE *pBits;<BR><BR> hdc = CreateIC(TEXT("DISPLAY"),NULL,NULL,NULL);<BR> hdcMem = CreateCompatibleDC(hdc);<BR> hBitMap = CreateDIBSection(hdcMem,lpbmih,DIB_PAL_COLORS,(void **)&pBits,NULL,0);<BR> pBitMap = new CBitmap;<BR> pBitMap->Attach(hBitMap);<BR> pMemDC = new CDC;<BR> pMemDC->Attach(hdcMem);<BR> pMemDC->SelectObject(pBitMap);<BR> //<BR> CRect rc(0,0,iWidth,iHeight);<BR> pMemDC->SetBkMode(TRANSPARENT);<BR> //添加自绘图形 <BR> DrawCurve(pMemDC,rc);<BR> //保存到文件并创建位图结构<BR> BITMAPFILEHEADER bmfh;<BR> ZeroMemory(&bmfh,sizeof(BITMAPFILEHEADER));<BR> *((char *)&bmfh.bfType) = ''B'';<BR> *(((char *)&bmfh.bfType) + 1) = ''M'';<BR> bmfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);<BR> bmfh.bfSize = bmfh.bfOffBits + (iWidth * iHeight) * iPixel / 8;<BR><BR> TCHAR szBMPFileName[128];<BR> int iBMPBytes = iWidth * iHeight * iPixel / 8;<BR> strcpy(szBMPFileName,filename);<BR> CFile file;<BR> if(file.Open(szBMPFileName,Cfile::modeWrite | Cfile::modeCreate))<BR> {<BR> file.Write(&bmfh,sizeof(BITMAPFILEHEADER));<BR> file.Write(&(lpbmih->bmiHeader),sizeof(BITMAPINFOHEADER));<BR> file.Write(pBits,iBMPBytes);<BR> file.Close();<BR> }<BR><BR> pMemDC->DeleteDC();<BR> delete pMemDC; pMemDC = NULL;<BR> delete pBitMap; pBitMap = NULL;<BR> delete lpbmih; lpbmih = NULL;<BR>}<BR><BR>//输出文本和图形<BR><BR>void CTestSaveBmpView::DrawCurve(CDC *pDC, CRect rcClient)<BR>{<BR> //页面背景色<BR> CBrush brushCtl;<BR> brushCtl.CreateSolidBrush(RGB(255,255,255));<BR> pDC->Rectangle(rcClient);<BR> pDC->FillRect(rcClient,&brushCtl) ;<BR> brushCtl.DeleteObject();<BR> <BR> CPen pen;<BR> pen.CreatePen(PS_SOLID, 1, RGB(255,0,0));<BR> CPen *oldPen = pDC->SelectObject(&pen); <BR><BR> double xMin = 10.00f, xMax = 100.00f;<BR> double yMin = 10.00f, yMax = 200.00f;<BR><BR> double dbX1 = (xMax- xMin)/100 + xMin;<BR> double dbY1 = 600/dbX1 ;<BR> for (int i=1; i<100; i++) //曲线<BR> {<BR> double dbX2 = (xMax- xMin)*i/100 + xMin;<BR> double dbY2 = 600/dbX2 ;<BR><BR> pDC->MoveTo(int(rcClient.left+(dbX1 - xMin)*rcClient.Width()/(xMax- xMin)), <BR> int(rcClient.bottom-(dbY1- yMin)*rcClient.Height()/(yMax- yMin)));<BR> pDC->LineTo(int(rcClient.left+(dbX2 - xMin)*rcClient.Width()/(xMax- xMin)), <BR> int(rcClient.bottom-(dbY2- yMin)*rcClient.Height()/(yMax- yMin))); <BR><BR> dbX1=dbX2;<BR> dbY1=dbY2;<BR> }<BR> pDC->SelectObject(oldPen); <BR> pen.DeleteObject();<BR> oldPen = NULL;<BR>}<BR><BR>//保存的实现<BR>void CTestSaveBmpView::OnRButtonDown(UINT nFlags, CPoint point) <BR>{<BR><BR> CFileDialog dlg(false,NULL,NULL,OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, "位图文件(*.bmp)|*.bmp|",NULL);<BR> if (dlg.DoModal()!= IDOK) return;<BR> CString filename = dlg.GetFileName() + ".bmp";<BR> SaveAsBmp(filename); <BR><BR> CView::OnRButtonDown(nFlags, point);<BR>}</TD></TR></TBODY></TABLE></p>
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