ifstream 和 ofstream 用法。

outfile << pContent;//不可以用这个，因为不能写完全，比如遇到字符串中出现/0就终止了

bool CTestEn_DecryptDLLDlg::WriteDataFile(CString strFileName, char *pContent, int nLen)
{
    ofstream outfile(strFileName, ios::out | ios::binary | ios::ate | ios::app);
    if (!outfile)
    {
        AfxMessageBox(_T("Unable to open outfile"));
        return false;
    }

    //for (int i = 0; i < nLen; ++i)
    //{
    //    outfile << pContent[i];
    //}
    //outfile << pContent;//不可以用这个，因为不能写完全，比如遇到字符串中出现/0就终止了
    outfile.write(pContent, nLen);
    outfile.close();
}

bool CTestEn_DecryptDLLDlg::ReadDataFile(CString strFileName, char *pContent, int &nLen)
{
    ifstream inFile(strFileName, ios::in | ios::binary);
    if (!inFile)
    {
        AfxMessageBox(_T("Unable to open inFile"));
        return false;
    }

    inFile.seekg(, ios::beg);
    //int i = 0;
    //while (!inFile.eof())
    //{
    //    inFile.get(pContent[i]);
    //    ++i;
    //}
    //nLen = i - 1;
    memset(pContent, , nLen);//初始化FileContent
    inFile.read(pContent, nLen);//读取数据

    inFile.close();//关闭ifstream对像
    return true;
}