MFC display JPG picture _c

: http://blog.csdn.net/crearo/article/details/1328974

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Screenshot of Effect:

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The main code is as follows:

Method Description: Display jpg and GIF, BMP picture//Parameter description: CDC * pDC Device Environment object//Parameter description: CSTR ing strpath picture Path//Parameter description: int x to display x position//Parameter description: int y to display the Y position//return value: BOO L successfully returns TRUE, otherwise returns false//************************************ BOOL Cshowjpgdlg::showjpggif (cdc* pdc,cstring s  
    Trpath, int x, int y) {cfilestatus fstatus;  
    CFile file;  

    ULONGLONG CB; Open the file and detect the validity of the file if (!file).
     Open (Strpath,cfile::moderead)) {return FALSE; } if (!file.
     GetStatus (Strpath,fstatus)) {return FALSE;
     if (CB =fstatus.m_size) <=0) {return FALSE;  
      ///Allocate memory space according to file size, remember to release memory hglobal hglobal = GlobalAlloc (gmem_moveable, (unsigned int) CB);
      if (hglobal== NULL) {return FALSE;  
      //Lock the memory space just allocated lpvoid pvData = NULL;
      PvData = GlobalLock (hglobal);  
  if (PvData = NULL)    {GlobalFree (HGLOBAL);
      Remember to free memory return FALSE;  
      //Put the file in the stream IStream *pstm; File.  
      Read (PvData, (unsigned int) CB);  
      GlobalUnlock (HGLOBAL);  
 
    CreateStreamOnHGlobal (Hglobal, TRUE, &pstm);
    Load pictures from the stream//display JPEG and GIF format pictures, GIF can only display one frame, can not display animation,///To display an animated GIF, use the active control. 
    IPicture *ppic; if (OleLoadPicture (PStm, (LONG) fstatus.m_size,true,iid_ipicture, (lpvoid*) &ppic)!=s_ok) {GlobalFree (HGloba  L);
    Remember to free memory return FALSE;  
    //Get the image wide and high, note that the width and height here is not the resolution of the image Ole_xsize_himetric Hmwidth;  
    Ole_ysize_himetric Hmheight;  
    Ppic->get_width (&hmwidth);  

    Ppic->get_height (&hmheight); Converts the image width and height units to pixel units//#define HIMETRIC_PER_INCH 2540//int npicwidth = MulDiv (Hmwidth, GetDeviceCaps (GetDC ()->m
   _HDC, logpixelsx), 2540);

   
    int npicheight = MulDiv (Hmheight, GetDeviceCaps (GetDC ()-&GT;M_HDC, logpixelsy), 2540);    HRESULT Render (//HDC HDC,//handle of device context on which to render the image//long x,//horizontal position of image in HDC
    Long y,//vertical position of image in HDC//Long CX,//horizontal dimension of destination rectangle Long CY,//vertical dimension of destination rectangle//ole_xpos_himetric xsrc,//horizontal OFFSE T in source picture//Ole_ypos_himetric ysrc,//vertical offset into source picture//Ole_xsize_himetri C cxsrc,//amount to copy horizontally in source picture//Ole_ysize_himetric cysrc,//amount to copy vertic
    Ally in Source picture//Lpcrect prcwbounds//pointer to position of destination for a metafile hdc

    //    );
    Use render function display image RECT Rtwnd;
    Pdc->getwindow ()->getwindowrect (&rtwnd);
    int iwndwidth=rtwnd.right-rtwnd.left;
    
    int iwndheight=rtwnd.bottom-rtwnd.top; if (FAILED Ppic->render (*pdc,x,y,iwndwidth,iwndheigHt,0,hmheight,hmwidth,-hmheight,null)) {ppic->release ());  GlobalFree (HGLOBAL);
    Remember to free memory return false; 
    } ppic->release ();  GlobalFree (HGLOBAL);
Remember to free memory return true; //************************************//Method Description: Display jpg and GIF, BMP picture//Parameter description: CDC * pDC Device Environment object//Parameter description: C      String strpath the picture path//Parameter description to display: int x to display the x position//Parameter description: int y to display the Y position//return value:  BOOL returns true successfully, otherwise returns false//************************************ BOOL Cshowjpgdlg::showimage (cdc* pdc,cstring 
    strpath, int x, int y) {ipicture *ppic=null;
    Oleloadpicturepath (CComBSTR (Strpath.getbuffer ()), (Lpunknown) NULL, 0, 0, iid_ipicture, (lpvoid*) &ppic);
    if (null==ppic) {return FALSE;  
    //Get the image wide and high, note that the width and height here is not the resolution of the image Ole_xsize_himetric Hmwidth;  
    Ole_ysize_himetric Hmheight;  
    Ppic->get_width (&hmwidth);  

    Ppic->get_height (&hmheight); //Convert image width and height units to pixel units//#define HIMETRIC_PER_INCH 2540//int npicwidth = MulDiv (Hmwidth, GetDeviceCaps (GetDC ()->m_
   HDC, logpixelsx), 2540);

   int npicheight = MulDiv (Hmheight, GetDeviceCaps (GetDC ()-&GT;M_HDC, logpixelsy), 2540);
   Gets the width and height of the Display picture window RECT Rtwnd;
   Pdc->getwindow ()->getwindowrect (&rtwnd);
   int iwndwidth=rtwnd.right-rtwnd.left;

   int iwndheight=rtwnd.bottom-rtwnd.top; if (FAILED (Ppic->render (*pdc,x,y,iwndwidth,iwndheight,0,hmheight,hmwidth,-hmheight,null)) {PPic->Releas
       E ();
   return false; 
   
   /Remember to release the resource, or it will cause a memory leak ppic->release ();
return true; //************************************//Method Description: Browse picture//return value: void//************************************ void Cshowjpgdlg::onbnclickedbtnbrowse () {//Todo:add your control notification handler code here CFileDialog dlg (TRU E, "JPG", "*.jpg", ofn_hidereadonly| Ofn_overwriteprompt, "JPEG file (*.jpg) |*.jpg| GIF file (*.gif) |*.gif|bmp file (*.bmp) |*.BMP| ", NULL); if (dlg. DoModal () ==idok) {setdlgitemtext, Idc_txt_path,dlg.

        GetPathName ()); Sets the style of a static control so that it can use a bitmap and displays the bitmap centered ((cstatic*) GetDlgItem (idc_static_img))-> ModifyStyle (0xf,ss_bitmap|

		Ss_centerimage);
		CDC *pdc=null;
        Pdc=getdlgitem (idc_static_img)->getdc (); Showjpggif (Pdc,dlg.
        GetPathName (), 0,0); ShowImage (Pdc,dlg.

		GetPathName (), 0,0);	ReleaseDC (PDC); Remember to release the resource, or it will cause a memory leak}}

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Example Engineering (VS2010) Download address: http://download.csdn.net/detail/friendan/7709595

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