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CFileDialog fDlg(1);
if(IDOK == fDlg.DoModal())
{
CFile file(fDlg.GetPathName(),CFile::modeReadWrite);
DWORD dwLen = file.GetLength();
HANDLE hMemFile = CreateFileMapping(file.m_hFile,
0,PAGE_READWRITE,0,dwLen,0);
char* pData = (char*)MapViewOfFile(hMemFile,FILE_MAP_WRITE,0,0,0);
CString str(pData);
MessageBox(str);
UnmapViewOfFile(pData);
file.Close();
}