用按钮打开对话框选取图片按大小显示在控件中

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打开按钮相应消息

void CLoadBmpDlg::OnBtnOpenBmp()
{
    // TODO: Add your control notification handler code here
////选取图片文件

    CFileDialog file_open_dlg(TRUE,NULL,NULL,OFN_HIDEREADONLY,"BMP Files(*.bmp)|*.bmp|All Files(*.*)|*.*||");
    if(file_open_dlg.DoModal() != IDOK)
    {
        return;
    }
    m_pFilePath = file_open_dlg.GetPathName();
//  ((CStatic*)GetDlgItem(IDC_STC_BMP))->SetBitmap(::LoadBitmap(AfxGetResourceHandle(), MAKEINTRESOURCE(IDB_BITMAP)));
//  HBITMAP hsource = (HBITMAP)LoadImage(AfxGetInstanceHandle(), m_pFilePath, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
//  HBITMAP hbmp = ((CStatic*)GetDlgItem(IDC_STC_BMP))-> SetBitmap(hsource);
    Invalidate( FALSE );
}

///OnPaint函数

void CLoadBmpDlg::OnPaint()

{

    //////////////////////////////////////////////////////////////
    CPaintDC bmpDC(GetDlgItem( IDC_STC_BMP ));
    CBitmap SourceImage;
    HBITMAP OldBitmap;
    CDC mDC;
    // SourceImage.LoadBitmap(image_name);
    HANDLE filehandle = (HBITMAP)LoadImage( NULL, m_pFilePath, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE );
    if ( filehandle != NULL )
    {
        BITMAP bmpInfo;
        SourceImage.Attach( filehandle );
        SourceImage.GetBitmap( &bmpInfo );
        CDC dcCompatible;
        dcCompatible.CreateCompatibleDC(&bmpDC);
        OldBitmap = (HBITMAP)dcCompatible.SelectObject(&SourceImage);
        CRect rec;
        ((CStatic *)GetDlgItem(IDC_STC_BMP))->GetClientRect(&rec);
        //      dc.BitBlt(rec.left, rec.top, rec.Width(), rec.Height(), &dcCompatible, 0, 0, SRCCOPY);
                int n = bmpDC.StretchBlt(rec.left, rec.top, rec.Width(), rec.Height(), &dcCompatible, rec.left, rec.top, bmpInfo.bmWidth, bmpInfo.bmHeight, SRCCOPY);
//
//      CBrush brush;
//      brush.CreatePatternBrush(&SourceImage);
//      bmpDC.FillRect(rec, &brush);
//      bmpDC.StretchBlt(rec.left, rec.top, rec.Width(), rec.Height(), &dcCompatible, rec.left, rec.top, bmpInfo.bmWidth, bmpInfo.bmHeight, SRCCOPY);
//      brush.DeleteObject();
        dcCompatible.SelectObject(&OldBitmap);
        SourceImage.Detach();
    }
}