读写文件

C 的方式

//读取文件验证
FILE * fp = NULL;
errno_t ret = fopen_s(&fp,w2s(strAppPath).c_str(), "rb");
if (ret)
{
    OutputDebugString(_T("open active file failed."));
    m_flag = 1;
    return TRUE;
}
else
{
    uint32_t length = 0;
    size_t ret = fread(&length, 1, 4, fp);
    if (ret != 4)
    {
        OutputDebugString(_T("read active file failed."));
        m_flag = 1;
        fclose(fp);
        return TRUE;
    }

    char* pbuf = new char[length];
    memset(pbuf, 0, length);
    ret = fread(pbuf, 1, length, fp);
    fclose(fp);
    ...
    delete[] pbuf;
}

写入文件

FILE * fp = NULL;
errno_t ret = fopen_s(&fp, w2s(strAppPath).c_str(), "wb");
if (ret)
{
    OutputDebugString(_T("open active file for write failed."));
    AfxMessageBox(_T("保存激活信息失败，请确认程序目录可写。"));
    return;
}
else {
    strInfo = w2s(str.GetBuffer());
    int iRet = fwrite(strInfo.c_str(), sizeof(char), strInfo.size(), fp);
    if (iRet != strInfo.size())
    {
        OutputDebugString(_T("write register info failed."));
        AfxMessageBox(_T("保存激活信息失败，请确认程序目录可写。。"));
    }
}
fclose(fp);