如何使用Stretchblt获取调整位图图像大小的方法

问题描述

在我的mfc应用程序中，我有一个对话框和一个图片控件(245,26,204,184)，其ID为IDC_pic.
我的代码是

SecondDlg.cpp

In my mfc application I have dialog box and a picture control(245,26,204,184) its id is IDC_pic.
My code is

SecondDlg.cpp

void CSecondDlg::DoDataExchange(CDataExchange* pDX)
 {
	CDialog::DoDataExchange(pDX);
	DDX_Control(pDX, IDC_pic, m_nHeight); //m_nHeight is CStatic object
}
void SecondDlg::OnBnClickedButton1()
{
	
	if(m_flag && m_hBmp)
	{
		capEditCopy(hMyWindow);
		OpenClipboard();
		m_hBmp = (HBITMAP)::GetClipboardData(CF_BITMAP);
		m_hBmp = (HBITMAP)::GetClipboardData(CF_BITMAP);
		m_nHeight.SetBitmap(m_hBmp); //here working fine
		BITMAP bm;
		GetObject(m_hBmp,sizeof(BITMAP),&bm);
		HDC TempHDC,TempHDC1;
		TempHDC1 = ::CreateCompatibleDC(NULL);
		SelectObject(TempHDC1,m_hBmp);
		CRect c1(245,26,24,14),c2(245,26,204,184);
		int rest=::StretchBlt(TempHDC1,550,157,50,50, TempHDC1, c2.left,c2.top,bm.bmWidth,bm.bmHeight, SRCCOPY ); 
		hOldBitmap2=CreateCompatibleBitmap(TempHDC1,204,184);
		GetObject(hOldBitmap2,sizeof(BITMAP),&bm);
		m_nHeight.SetBitmap(hOldBitmap2);
		DeleteDC(TempHDC);
 		CloseClipboard();		
	}
}

我在SecondDlg上具有图片控件(ID为IDC_pic).
现在IDC_pic出现黑屏了.

I have picture control(id is IDC_pic) on SecondDlg.
Now IDC_pic got black screen.

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