关于VirtualProtect的使用问题

[mrh123]

MFC对话框应用程序，在窗体上有一个EDIT控件，定义为值变量m_edt2,我想做的是修改m_edt2的在内存中保护属性，代码如下：

DWORD dwOldProtection;
MEMORY_BASIC_INFORMATION mbi;
CString strInfo;

if (VirtualQuery((PVOID)&m_edt2,&mbi,sizeof(mbi)) != sizeof(mbi))
AfxMessageBox(_T("Virtual Query Failed"));
else
{
//if (mbi.BaseAddress > (PVOID)&m_edt2)
// AfxMessageBox(_T("round to next page"));
strInfo.Format("%p;%p",mbi.BaseAddress ,&m_edt2);
AfxMessageBox(strInfo);

strInfo.Format("%d",mbi.RegionSize );
AfxMessageBox(strInfo);

switch(mbi.State)
{
case MEM_COMMIT:
strInfo = _T("Commit");
break;
case MEM_FREE:
strInfo = _T("Free");
break;
case MEM_RESERVE:
strInfo = _T("Reserve");
break;
}
AfxMessageBox(strInfo);

strInfo = _T("");

if (mbi.AllocationProtect & PAGE_EXECUTE)
strInfo += _T("PAGE_EXECUTE|");
if (mbi.AllocationProtect & PAGE_EXECUTE_READ)
strInfo += _T("PAGE_EXECUTE_READ|");
if (mbi.AllocationProtect & PAGE_EXECUTE_READWRITE)
strInfo += _T("PAGE_EXECUTE_READWRITE|");
if (mbi.AllocationProtect & PAGE_EXECUTE_WRITECOPY)
strInfo += _T("PAGE_EXECUTE_WRITECOPY|");
if (mbi.AllocationProtect & PAGE_NOACCESS)
strInfo += _T("PAGE_NOACCESS|");
if (mbi.AllocationProtect & PAGE_READONLY)
strInfo += _T("PAGE_READONLY|");
if (mbi.AllocationProtect & PAGE_READWRITE)
strInfo += _T("PAGE_READWRITE|");
if (mbi.AllocationProtect & PAGE_WRITECOPY)
strInfo += _T("PAGE_WRITECOPY");

AfxMessageBox(strInfo);
}

PVOID pBaseAddress = &m_edt2;
//if (VirtualProtect(mbi.BaseAddress ,mbi.RegionSize ,PAGE_NOACCESS,&mbi.Protect))
if (VirtualProtect(pBaseAddress ,4 ,PAGE_NOACCESS,&dwOldProtection))
AfxMessageBox(_T("设置PAGE属性成功"));
else
AfxMessageBox(_T("设置PAGE属性失败"));

程序运行到VirtualProtect的时候就出错直接退出了，我这样做哪里不对，请帮忙~~~~

[mrh123]

自己UP一下了~~~

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