VC中圖像控件的用法與總結.doc

使用picture控件動態(tài)顯示圖片方法一 控件適應于圖片尺寸添加一個picture控件，修改ID為IDC-PICTURE,并添加一CBitmap m_bmp成員變量在OnInitDialog()函數(shù)中添加如下代碼if(m_bmp.m_hObject!=NULL) m_bmp.DeleteObject();/以絕對路徑加載BMP圖片HBITMAP hbmp=(HBITMAP):LoadImage(AfxGetInstanceHandle(),1.bmp,IMAGE_BITMAP,0,0,LR_CREATEDIBSECTION | LR_LOADFROMFILE);if(hbmp=NULL) return false;/獲得加載位圖的文件信息m_bmp.Attach(hbmp);DIBSECTION ds;BITMAPINFOHEADER &bminfo=ds.dsBmih;/獲得位圖信息圖m_bmp.GetObject(sizeof(ds),&ds);int cx=bminfo.biWidth;/獲得位圖寬度int cy=bminfo.biHeight;/獲得位圖高度/該段程序根據(jù)圖象的寬和高，調(diào)整控件大小，讓它正好顯示一張圖片CRect rect;GetDlgItem(IDC_PICTRUE)-GetWindowRect(&rect);/獲得控件所在矩形區(qū)域ScreenToClient(&rect);GetDlgItem(IDC_PICTRUE)-MoveWindow(rect.left,rect.top,cx,cy,true);/調(diào)整控件大小在OnPaint()函數(shù)中添加如下代碼/三種方法獲得pictrue控件DC，圖象將被繪制在控件上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 圖片適用于控件尺寸 添加一個picture控件，修改ID為IDC-PICTURE在OnPaint()函數(shù)中添加如下代碼CWnd *pWnd=GetDlgItem(IDC_PICTRUE);/獲得pictrue控件窗口的句柄CRect rect;pWnd-GetClientRect(&rect);/獲得pictrue控件所在的舉行區(qū)域CDC *pDC=pWnd-GetDC();/獲得pictrue控件的DCIStream *pStm;CFileStatus fstatus;CFile file;LONG cb;IPicture *pPic;/定義顯示圖片的接口（可顯示jpg格式圖片）CString m_sPath=1.BMP;/設置想要顯示的圖片/打開圖象文件，獲取文件字節(jié)數(shù)if(file.Open(m_sPath,CFile:modeRead) & file.GetStatus(m_sPath,fstatus) & (cb=fstatus.m_size)!=-1) /分配全局存儲空間 HGLOBAL hGlobal=GlobalAlloc(GMEM_MOVEABLE,cb); LPVOID pvData=NULL; if(hGlobal!=NULL) /鎖定分配內(nèi)存塊 if(pvData=GlobalLock(hGlobal)!=NULL) /讀入文件到內(nèi)存緩沖區(qū) file.ReadHuge(pvData,cb); GlobalUnlock(hGlobal); CreateStreamOnHGlobal(hGlobal,true,&pStm); /裝載圖象文件if(SUCCEEDED(OleLoadPicture(pStm,fstatus.m_size,TRUE,IID_IPicture,(LPVOID*)&pPic) OLE_XSIZE_HIMETRIC hmWidth; OLE_XSIZE_HIMETRIC hmHeight; pPic-get_Width(&hmWidth);/獲得圖象真實寬度 pPic-get_Height(&hmHeight);/獲得圖象真實高度 /在控件上顯示圖片 pPic-Render(*pDC,0,0,rect.Width(),rect.Height(),0,hmHeight,hmWidth,-hmHeight,NULL); pPic-Release();圖片顯示通用模塊首先為類添加如下兩個函數(shù)和一個成員變量IPicture* m_pPicture;/圖片加載函數(shù)HRESULT LoadFromBuffer(BYTE *pBuff, int nSize)bool bResult=false;HGLOBAL hGlobal=GlobalAlloc(GMEM_MOVEABLE,nSize);/分配內(nèi)存空間void *pData=GlobalLock(hGlobal);/定義圖象數(shù)據(jù)指針memcpy(pData,pBuff,nSize);GlobalUnlock(hGlobal);/釋放內(nèi)存空間IStream *pStream=NULL;/定義數(shù)據(jù)流指針/創(chuàng)建數(shù)據(jù)流if(CreateStreamOnHGlobal(hGlobal,TRUE,&pStream)=S_OK)HRESULT hr;/定義返回結果if(hr=OleLoadPicture(pStream,nSize,FALSE,IID_IPicture,(LPVOID*)&m_pPicture)=S_OK)bResult=true;pStream-Release();/釋放數(shù)據(jù)流return bResult;/圖片顯示函數(shù)BOOL DrawFromFile(CString filename, CDC *pDC)CFile cFile;CFileException e;/打開文件if(cFile.Open(filename,CFile:modeRead | CFile:typeBinary,&e)BYTE *pBuff=new BYTEcFile.GetLength();/定義分配內(nèi)存if(cFile.Read(pBuff,cFile.GetLength()0)/將文件讀入緩存LoadFromBuffer(pBuff,cFile.GetLength();delete pBuff;/釋放緩存long hmWidth,hmHeight;m_pPicture-get_Width(&hmWidth);m_pPicture-get_Height(&hmHeight);/獲取圖片尺寸int nWidth=MulDiv(hmWidth,pDC-GetDeviceCaps(LOGPIXELSX),2540);int nHeight=MulDiv(hmHeight,pDC-GetDeviceCaps(LOGPIXELSX),2540);/在內(nèi)存中畫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);/將內(nèi)存中畫拷貝到目的地pDC-BitBlt(0,0,nWidth,nHeight,&MenDC,0,0,SRCCOPY);return true;然后在OnPaint()函數(shù)中顯示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