读写文件

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;
}