各位，帮忙看下啊。。我在MFC单文档中实现透明桌面和白色背景绘图2中模式。现在有个问题是透明桌面时，撤销与返回程序执行但是没效果？、调试时显示OK，就是直接运行时没效果啊？/急急急！
void CMainFrame::OnPizhu()
{
// TODO: Add your command handler code here
CMainFrame* frm=(CMainFrame*)AfxGetApp()->m_pMainWnd;
CHDrawView* pView=(CHDrawView*)frm->GetActiveView();
CHDrawDoc* pDoc=(CHDrawDoc*)frm->GetActiveDocument();
pDoc->OnDrawClear();
pDoc->DeleteContents();
if(DeleteAll("C:\\Windows\\Temp3\\"))
{
pDoc->m_backup.RemoveAll();
}
else
AfxMessageBox("ERROR");
pDoc->m_picType = PIC_poly;
pDoc->m_picColor = RGB(0,0,0);
pDoc->m_picWidth = 1;
pDoc->m_picStyle = PS_SOLID;
pDoc->m_cavasH = 1000;
pDoc->m_cavasW =1500;
pDoc->m_backup_index =0;
pDoc->BackUp();
Width = GetSystemMetrics(SM_CXSCREEN);
Heigth = GetSystemMetrics(SM_CYSCREEN);
MoveWindow(40,50,Width-100,Heigth-100);
ShowWindow(SW_HIDE);
Sleep(100);
ShowWindow(SW_SHOW);
CWnd* wnd = GetDesktopWindow();
CWindowDC cdc(wnd);
memdc.CreateCompatibleDC(&cdc);
btmp.CreateCompatibleBitmap(&cdc, Width, Heigth);
memdc.BitBlt(0,0, Width, Heigth, &cdc, 0, 0, SRCCOPY);
ShowWindow(SW_SHOW);
pView->flags=2;
void CMainFrame::OnUndo()
{
CMainFrame* frm=(CMainFrame*)AfxGetApp()->m_pMainWnd;
CHDrawDoc* pDoc=(CHDrawDoc*)frm->GetActiveDocument();
pDoc->OnEditUndo();
pDoc->UpdateAllViews(NULL);
}
void CHDrawView::OnDraw(CDC* pDC)
{
CHDrawDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
// TODO: add draw code for native data here
OnPrepareDC(pDC);
if(flags==1)
{
CClientDC dc(this);
CRect rect;
GetClientRect(&rect); //得到窗体的大小
CDC dcMem;
dcMem.CreateCompatibleDC(&dc);
CBitmap bmpBackground;
bmpBackground.LoadBitmap(IDB_BITMAP2);//加载背景图片
BITMAP bitMap;
bmpBackground.GetBitmap(&bitMap);
CBitmap *pbmpOld=dcMem.SelectObject(&bmpBackground);
dc.StretchBlt(0,0,rect.Width(),rect.Height(),&dcMem,0,0,bitMap.bmWidth,bitMap.bmHeight,SRCCOPY);
void CHDrawDoc::ReStore(BOOL backward)
{
m_backup_index -= backward ? 1 : -1;
//make m_backup[m_backup_index] the current document data
int num=m_backup.GetSize();
if((m_backup_indexm_backup.GetSize())
{
MessageBox(NULL,"操作错误","Warning",MB_OK|MB_ICONWARNING);
}
else
{
OnOpenDocument(m_backup.GetAt(m_backup_index-1));
}
}
