用按钮打开对话框选取图片按大小显示在控件中

时间：2014-05-01 07:51:23 阅读：345 评论：0 收藏：0 [点我收藏+]

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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

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//////////////////////////////////////////////////////////////
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();
}
}

原文地址：http://www.cnblogs.com/lidabo/p/3701762.html

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