????????????多文档保存Ondraw所画图像

[leemeng0x61]

多文档保存Ondraw所画图像无法保存,请教高手帮助!!!!!!!!!!

[mumutian]

void CTFractalDoc::OnFileSave()
{
CTFractalView* pView=(CTFractalView*)((CMainFrame*)AfxGetMainWnd())->GetActiveView();
CRect rc=pView->m_ampRect;
BOOL Whole=TRUE;
if(rc.Width()*rc.Height()!=0)
{
SaveDlg dlg;//CFileDialog也可以，目的是获取需要保存的文件名
if(dlg.DoModal()==IDCANCEL) return;
else Whole=dlg.m_bWhole;
}
if(Whole) pView->GetClientRect(&rc);
else rc+=CPoint(2,2);
SaveRectToBmp(pView,rc);
}

void CTFractalDoc::SaveRectToBmp(CWnd* pWnd,CRect& rect)
{
CDC* pWndDC,dcMem;
CBitmap bitmap;

pWndDC=pWnd->GetWindowDC();
dcMem.CreateCompatibleDC(pWndDC);

bitmap.CreateCompatibleBitmap(pWndDC,rect.Width(),rect.Height());

CBitmap* pOldBitmap=dcMem.SelectObject(&bitmap);
dcMem.BitBlt(0,0,rect.Width(),rect.Height(),pWndDC,rect.left,rect.top,SRCCOPY);
HBITMAP hBitmap=(HBITMAP)bitmap;
CPalette* pPalette=dcMem.GetCurrentPalette();
HANDLE hPalette=(HANDLE)pPalette;

DWORD dwPaletteSize=0;
if(hPalette!=NULL)
dwPaletteSize=::GlobalSize(hPalette);

BITMAP bm;
::GetObject(hBitmap,sizeof(BITMAP),&bm);
BITMAPFILEHEADER bfh;
BITMAPINFOHEADER bih;

memset(&bfh,0,sizeof(BITMAPFILEHEADER));
memset(&bih,0,sizeof(BITMAPINFOHEADER));

DWORD dwImageSize=bm.bmHeight*bm.bmWidthBytes;

bfh.bfType='MB';
bfh.bfSize=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwImageSize;
bfh.bfOffBits=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+dwPaletteSize;

bih.biSize=sizeof(BITMAPINFOHEADER);
bih.biWidth=bm.bmWidth;
bih.biHeight=bm.bmHeight;
bih.biPlanes=bm.bmPlanes;
bih.biBitCount=bm.bmBitsPixel;
bih.biSizeImage=::GlobalSize(hBitmap);

char szFilter[]=_T("BMP Files (*.bmp)|*.bmp|All Files(*.*)|*.*||");
CFileDialog FileDlg(FALSE,NULL,NULL,OFN_HIDEREADONLY,szFilter);//

if(FileDlg.DoModal()==IDCANCEL) return;
CString szFileName=FileDlg.GetFileName();
//auto detect and sure extend name is ".bmp"
if(szFileName.Find(".bmp")==-1)
szFileName+=".bmp";

CFile cf;
if(cf.Open(szFileName,CFile::modeCreate|CFile::modeWrite))
{
cf.Write(&bfh,sizeof(BITMAPFILEHEADER));
cf.Write(&bih,sizeof(BITMAPINFOHEADER));
if(hPalette!=NULL)
{
char* pBuffer=(char*)::GlobalLock(hPalette);
cf.Write(pBuffer,dwPaletteSize);
::GlobalUnlock(hPalette);
}
char* pDataBuffer=new char[dwImageSize];
if(pDataBuffer!=NULL)
{
::GetBitmapBits(hBitmap,dwImageSize,pDataBuffer);
for(int i=0;i<bm.bmHeight;i++)
{
int nOffset;
nOffset=bm.bmHeight-i-1;
nOffset*=bm.bmWidthBytes;
cf.Write(&pDataBuffer[nOffset],bm.bmWidthBytes);
}
delete[] pDataBuffer;
}
}
dcMem.SelectObject(pOldBitmap);
bitmap.Detach();
}