文件写入期间磁盘已满.我如何获得有关此的通知?

问题描述

我有一个很大的对象要序列化到磁盘，像这样:

I have a quite big object to serialize to disk, like this:

if (!EngineFile.empty())
{
    std::ofstream OutEngineStream(EngineFile);
    if (!OutEngineStream)
    {
        std::cerr << "Failed to write to file \"" << EngineFile << "\"! Aborting ..." << std::endl;
        return -1;
    }
    engine->serialize(OutEngineStream);
    OutEngineStream.close();

    std::cout << "\"" << EngineFile << "\" successfully wrote to disk." << std::endl;
}

问题是，somtimes serialize需要的磁盘空间比可用磁盘空间大.例如只有30M的可用存储空间，但serialize需要200M的存储空间.在这种情况下，我通常可以open流.在serialize期间一切正常，而close不返回任何内容.该程序运行良好，但是磁盘上只有30M文件.

The problem is, somtimes serialize requires larger disk space than available. e.g. there is only 30M storage available but serialize requires 200M. In this case I can normally open the stream. During serialize everything goes well, and close returns nothing. The program runs well, but there is only a 30M file on the disk.

如何了解此案?

推荐答案

首先，serialize应不断验证其写操作是否成功，如果失败则抛出.

First of all, serialize should constantly verify whether its write operations succeed and throw should they fail.

在您提供的代码中，您应该检查 OutEngineStream.fail() (在调用close之前，它涵盖的情况比bad更多)(因为close可能还会设置此状态).但是，这仍然会导致serialize实施不正确.

In the code you've presented you should check OutEngineStream.fail() (it covers more cases than bad) before calling close (because close may also set this state). This however will still leave serialize implemented incorrectly.

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