ii.txt

在ＶＣ中打开图象的具体步骤

在view类添加
CString JpgName;
BOOL   DrawImg(CString   strFile,   
      CDC   *pDC,   
      CRect   rc,   
      BOOL   bStretch) ;
int State1; (构造函数中初始化为0)
2.view类中实现上面的DrawImg函数。
BOOL   ——View::DrawImg(CString   strFile,    CDC   *pDC,   CRect   rc,   BOOL   bStretch)   
	{   
		IPicture   *pPic;   
		IStream   *pStm;   
    
		CFileStatus   fstatus;     
		CFile   file;     
		LONG   cb;     
		if   (file.Open(strFile,CFile::modeRead)   &&   file.GetStatus(strFile,   fstatus)   &&     ((cb   =   fstatus.m_size)   !=   1))     
			{     
				HGLOBAL   hGlobal   =   GlobalAlloc(GMEM_MOVEABLE,   cb);   
				LPVOID   pvData   =   NULL;   
				if   (hGlobal   !=   NULL)     
				{     
					if   ((pvData   =   GlobalLock(hGlobal))   !=   NULL)     
					{     
						file.ReadHuge(pvData,   cb);     
						GlobalUnlock(hGlobal);   
						CreateStreamOnHGlobal(hGlobal,   TRUE,   &pStm);     
    
if(SUCCEEDED(   
	OleLoadPicture(pStm,fstatus.m_size,TRUE,   
	IID_IPicture,(LPVOID*)&pPic)))     
	{     
		OLE_XSIZE_HIMETRIC   hmWidth;     
		OLE_YSIZE_HIMETRIC   hmHeight;     
    
		pPic->get_Width(&hmWidth);     
		pPic->get_Height(&hmHeight);     
    
		double   fX,fY;     
	fX   =   (double)pDC->GetDeviceCaps(HORZRES)*   (double)hmWidth/   ((double)pDC->GetDeviceCaps(HORZSIZE)*100.0);     
fY   =   (double)pDC->GetDeviceCaps(VERTRES)*   (double)hmHeight/   ((double)pDC->GetDeviceCaps(VERTSIZE)*100.0);   
		int   left   =   rc.left;   
		int   top   =   rc.top;   
		int   width   =   rc.Width();   
		int   height   =   rc.Height();   
if   (bStretch)   
	{   
		if   (width   ==   0)   width   =   (int)fX;   
		if   (height   ==   0)   height   =   (int)fY;   
	}   
else   
	{   
		width   =   (int)fX;   
		height   =   (int)fY;   
	}   
if(FAILED(pPic->Render(*pDC,     left,     top,     width,   height,   0,   hmHeight,   hmWidth,   -hmHeight,   NULL)))     
	{   
		AfxMessageBox("Failed   To   Render   The   picture!");     
		return   FALSE;   
	}   
		pPic->Release();     
}     
else   
{   
AfxMessageBox("Error   Loading   Picture   From   Stream!");     
return   FALSE;   
}   
}     
}     
}     
else     
{   
AfxMessageBox("Can't   Open   Image   File!");     
return   FALSE;   
}   
return   TRUE;   
}
3.添加菜单，ID为ID_OPENJPG,在view类中添加相应的消息响应函数
void ——View::OnOpenjpg() 
{
// TODO: Add your command handler code here

if(State1==1)
{
        State1=0;
}
CString   sFilter;   
sFilter   =   ("图象文件(*.bmp;*.jpg;*.jpeg)|*.bmp;*.jpg;*.jpeg|所有文件(*.*)|*.*||");   
CFileDialog   dlg(TRUE,   NULL,   NULL,     
OFN_HIDEREADONLY   |   OFN_FILEMUSTEXIST,   sFilter,   this); 
if(IDOK==dlg.DoModal())   
              {   
                  JpgName.Format("%s",dlg.GetPathName()); 
      		State1=1;
                    
              }   
Invalidate(); 

}
4,在onDraw函数中添加代码


if(State1==1)
{
CRect   rc;
GetClientRect(&rc);//得到客户区大小
BOOL   bStretch=TRUE;//把图片拉伸和窗口一样大
CMyPictureShopView::DrawImg(JpgName,   
     pDC,   
       rc,   
      bStretch)   ;

}