bmp文件生成

2016/08/01 21:28
阅读数 20
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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