使用picture控件动态显示图片方法.doc

使用picture控件动态显示图片方法一 控件适应于图片尺寸添加一个picture控件，修改ID为IDC-PICTURE,并添加一CBitmap m_bmp成员变量在OnInitDialog()函数中添加如下代码if(m_bmp.m_hObject!=NULL) m_bmp.DeleteObject();/以绝对路径加载BMP图片HBITMAP hbmp=(HBITMAP):LoadImage(AfxGetInstanceHandle(),1.bmp,IMAGE_BITMAP,0,0,LR_CREATEDIBSECTION | LR_LOADFROMFILE);if(hbmp=NULL) return false;/获得加载位图的文件信息m_bmp.Attach(hbmp);DIBSECTION ds;BITMAPINFOHEADER &bminfo=ds.dsBmih;/获得位图信息图m_bmp.GetObject(sizeof(ds),&ds);int cx=bminfo.biWidth;/获得位图宽度int cy=bminfo.biHeight;/获得位图高度/该段程序根据图象的宽和高，调整控件大小，让它正好显示一张图片CRect rect;GetDlgItem(IDC_PICTRUE)-GetWindowRect(&rect);/获得控件所在矩形区域ScreenToClient(&rect);GetDlgItem(IDC_PICTRUE)-MoveWindow(rect.left,rect.top,cx,cy,true);/调整控件大小在OnPaint()函数中添加如下代码/三种方法获得pictrue控件DC，图象将被绘制在控件上CPaintDC dc(GetDlgItem(IDC_PICTRUE);/CPaintDC dc(this);/CDC dc;/dc.m_hDC=:GetDC(NULL);CRect rcclient;GetDlgItem(IDC_PICTRUE)-GetClientRect(&rcclient);CDC memdc;memdc.CreateCompatibleDC(&dc);CBitmap bitmap;bitmap.CreateCompatibleBitmap(&dc,rcclient.Width(),rcclient.Height();memdc.SelectObject(&bitmap);CWnd:DefWindowProc(WM_PAINT,(WPARAM)memdc.m_hDC,0); CDC maskdc;maskdc.CreateCompatibleDC(&dc);CBitmap maskbitmap;maskbitmap.CreateBitmap(rcclient.Width(),rcclient.Height(),1,1,NULL);maskdc.SelectObject(&maskbitmap);maskdc.BitBlt(0,0,rcclient.Width(),rcclient.Height(),&memdc,rcclient.left,rcclient.top,SRCCOPY);CBrush brush;brush.CreatePatternBrush(&m_bmp);dc.FillRect(rcclient,&brush);dc.BitBlt(rcclient.left,rcclient.top,rcclient.Width(),rcclient.Height(),&memdc,rcclient.left,rcclient.top,SRCPAINT);brush.DeleteObject();二 图片适用于控件尺寸 添加一个picture控件，修改ID为IDC-PICTURE在OnPaint()函数中添加如下代码CWnd *pWnd=GetDlgItem(IDC_PICTRUE);/获得pictrue控件窗口的句柄CRect rect;pWnd-GetClientRect(&rect);/获得pictrue控件所在的举行区域CDC *pDC=pWnd-GetDC();/获得pictrue控件的DCIStream *pStm;CFileStatus fstatus;CFile file;LONG cb;IPicture *pPic;/定义显示图片的接口（可显示jpg格式图片）CString m_sPath=1.BMP;/设置想要显示的图片/打开图象文件，获取文件字节数if(file.Open(m_sPath,CFile:modeRead) & file.GetStatus(m_sPath,fstatus) & (cb=fstatus.m_size)!=-1) /分配全局存储空间 HGLOBAL hGlobal=GlobalAlloc(GMEM_MOVEABLE,cb); LPVOID pvData=NULL; if(hGlobal!=NULL) /锁定分配内存块 if(pvData=GlobalLock(hGlobal)!=NULL) /读入文件到内存缓冲区 file.ReadHuge(pvData,cb); GlobalUnlock(hGlobal); CreateStreamOnHGlobal(hGlobal,true,&pStm); /装载图象文件if(SUCCEEDED(OleLoadPicture(pStm,fstatus.m_size,TRUE,IID_IPicture,(LPVOID*)&pPic) OLE_XSIZE_HIMETRIC hmWidth; OLE_XSIZE_HIMETRIC hmHeight; pPic-get_Width(&hmWidth);/获得图象真实宽度 pPic-get_Height(&hmHeight);/获得图象真实高度 /在控件上显示图片 pPic-Render(*pDC,0,0,rect.Width(),rect.Height(),0,hmHeight,hmWidth,-hmHeight,NULL); pPic-Release();图片显示通用模块首先为类添加如下两个函数和一个成员变量IPicture* m_pPicture;/图片加载函数HRESULT LoadFromBuffer(BYTE *pBuff, int nSize)bool bResult=false;HGLOBAL hGlobal=GlobalAlloc(GMEM_MOVEABLE,nSize);/分配内存空间void *pData=GlobalLock(hGlobal);/定义图象数据指针memcpy(pData,pBuff,nSize);GlobalUnlock(hGlobal);/释放内存空间IStream *pStream=NULL;/定义数据流指针/创建数据流if(CreateStreamOnHGlobal(hGlobal,TRUE,&pStream)=S_OK)HRESULT hr;/定义返回结果if(hr=OleLoadPicture(pStream,nSize,FALSE,IID_IPicture,(LPVOID*)&m_pPicture)=S_OK)bResult=true;pStream-Release();/释放数据流return bResult;/图片显示函数BOOL DrawFromFile(CString filename, CDC *pDC)CFile cFile;CFileException e;/打开文件if(cFile.Open(filename,CFile:modeRead | CFile:typeBinary,&e)BYTE *pBuff=new BYTEcFile.GetLength();/定义分配内存if(cFile.Read(pBuff,cFile.GetLength()0)/将文件读入缓存LoadFromBuffer(pBuff,cFile.GetLength();delete pBuff;/释放缓存long hmWidth,hmHeight;m_pPicture-get_Width(&hmWidth);m_pPicture-get_Height(&hmHeight);/获取图片尺寸int nWidth=MulDiv(hmWidth,pDC-GetDeviceCaps(LOGPIXELSX),2540);int nHeight=MulDiv(hmHeight,pDC-GetDeviceCaps(LOGPIXELSX),2540);/在内存中画CDC MenDC;CBitmap bmp;bmp.CreateCompatibleBitmap(pDC,nWidth,nHeight);MenDC.CreateCompatibleDC(NULL);MenDC.SelectObject(&bmp);m_pPicture-Render(MenDC.m_hDC,0,0,nWidth,nHeight,0,hmHeight,hmWidth,-hmHeight,NULL);/将内存中画拷贝到目的地pDC-BitBlt(0,0,nWidth,nHeight,&MenDC,0,0,SRCCOPY);return true;然后在OnPaint()函数中显示void CDialogDlg:OnPaint() CPaintDC dc(this); / device context for paintingif (IsIconic()SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);/ Center icon in client rectangleint cxIcon = GetSystemMetrics(SM_CXICON);int cyIcon = GetSystemMetrics(SM_CYICON);CRect rect;GetCl