如何在控件上加载jpeg图象

chongwenwang 2007-10-10 08:55:45

如何将jpeg格式的图象转换成bmp图象在控件上显示出来

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lyg_zy 2007-10-16

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用GDI+显示吧。要求开发环境.net2003以上。示例代码如下：

#include "atlImage.h"

/**

* 在目标DC的目标矩形rc中显示pJpeg文件的JPEG图象，并保存为bmp

*/

void DisplayJpeg( char *pJpgeFile,HDC hdc,RECT & rc )

{	 



	/**

	* imag对象从pJpgeFile文件中加载图像并绘制到目标DC的目标矩形rc中

	*/

	CImage imag;

	imag.Load( pJpgeFile );

	imag.Draw( hdc, rc );



	/**

	* 保存为bmp图片

	*/

	imag.Save( "c:\\1.bmp" );



}

Kudeet 2007-10-15

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void   CMenuDlg::LoadPictureFromFile(LPCTSTR   szFile,   CBitmap   *pBitmap)//szFile是jpg文件名，打开时最好到debug目录下，避免路径错误   

  {   

          //   open   file   

          HANDLE   hFile   =   CreateFile(szFile,   GENERIC_READ,   0,   NULL,   OPEN_EXISTING,   0,   NULL);   

        //   _ASSERTE(INVALID_HANDLE_VALUE   !=   hFile);   

    

          //   get   file   size   

          DWORD   dwFileSize   =   GetFileSize(hFile,   NULL);   

          _ASSERTE(-1   !=   dwFileSize);   

    

          LPVOID   pvData   =   NULL;   

          //   alloc   memory   based   on   file   size   

          HGLOBAL   hGlobal   =   GlobalAlloc(GMEM_MOVEABLE,   dwFileSize);   

          _ASSERTE(NULL   !=   hGlobal);   

    

          pvData   =   GlobalLock(hGlobal);   

          _ASSERTE(NULL   !=   pvData);   

    

          DWORD   dwBytesRead   =   0;   

          //   read   file   and   store   in   global   memory   

          BOOL   bRead   =   ReadFile(hFile,   pvData,   dwFileSize,   &dwBytesRead,   NULL);   

          _ASSERTE(FALSE   !=   bRead);   

          GlobalUnlock(hGlobal);   

          CloseHandle(hFile);   

    

          LPSTREAM   pstm   =   NULL;   

          //   create   IStream*   from   global   memory   

          HRESULT   hr   =   CreateStreamOnHGlobal(hGlobal,   TRUE,   &pstm);   

          _ASSERTE(SUCCEEDED(hr)   &&   pstm);   

    

          //   Create   IPicture   from   image   file   

          LPPICTURE   gpPicture;   

    

          hr   =   ::OleLoadPicture(pstm,   dwFileSize,   FALSE,   IID_IPicture,   (LPVOID   *)&gpPicture);           

            

          _ASSERTE(SUCCEEDED(hr)   &&   gpPicture);           

          pstm->Release();   

    

          OLE_HANDLE   m_picHandle;   

            

          gpPicture->get_Handle(&m_picHandle);   

          pBitmap->DeleteObject();   

          pBitmap->Attach((HGDIOBJ)   m_picHandle);   

    

            

  }