下载本文示例代码
本文源代码下载 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);}
本文源代码下载 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);}
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