求助：对话框中背景图变化

Question

对话框中背景图变化,位图在硬盘上，能够加载到对话框的背景上面，最好能有例程，谢谢

Answer 1

用LoadImage函数就可以读入硬盘中的位图文件了。

Answer 2

在OnPaint函数里CPaintDC dc(this); // device context for painting

CBitmap  bitmap;
bitmap.LoadBitmap(IDB_BITMAP1);

BITMAP bmpInfo;
bitmap.GetBitmap(&bmpInfo); CDC dcMemory;
dcMemory.CreateCompatibleDC(&dc); CBitmap *pOldBmp = dcMemory.SelectObject(&bitmap); dc.BitBlt(0,0,bmpInfo.bmWidth,bmpInfo.bmHeight,&dcMemory,0,0,SRCCOPY);

Answer 3

CDC m_dcMem;
CBitmap m_bmMem;void CTest3Dlg::OnButton1() 
{
// TODO: Add your control notification handler code here

HBITMAP hBitmap = (HBITMAP)::LoadImage( NULL , "E:\\1.bmp" , IMAGE_BITMAP , 0 , 0 , LR_LOADFROMFILE);
if(hBitmap == NULL) return;

if(m_dcMem.GetSafeHdc() != NULL)
m_dcMem.DeleteDC();
if(m_bmMem.GetSafeHandle() != NULL)
m_bmMem.DeleteObject(); m_bmMem.Attach(hBitmap); CDC *dc = GetDC();
m_dcMem.CreateCompatibleDC( dc );
m_dcMem.SelectObject(m_bmMem);
ReleaseDC(dc);

Invalidate();
}
void CTest3Dlg::OnDestroy() 
{
CDialog::OnDestroy();

// TODO: Add your message handler code here
if(m_dcMem.GetSafeHdc() != NULL)
{
m_dcMem.DeleteDC();
}
if(m_bmMem.GetSafeHandle() != NULL)
{
m_bmMem.DeleteObject();
}
}
void CTest3Dlg::OnPaint() 
{
CPaintDC dc(this);
if(m_dcMem.GetSafeHdc() != NULL )
{
CRect rc;
GetClientRect(&rc);
dc.BitBlt( 0 , 0 , rc.Width() , rc.Height() , &m_dcMem , 0 , 0 , SRCCOPY);
}
}