C++ 文件读写异常处理

dxm809

于 2021-06-25 16:17:57 发布

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分类专栏： C++

本文链接：https://blog.youkuaiyun.com/dxm809/article/details/117220345

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本文介绍了如何使用CFile类进行文件读写操作，并展示了在处理CFileException异常时的具体案例，包括文件未找到、文件句柄不足、硬件错误等，并通过CharLowerBuff函数进行了字符转换。

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	char* pBuffer = new char[0x1000];
	try {
		CFile file("mydoc.doc", CFile::modeReadWrite);
		DWORD dwBytesRemaining = file.GetLength();
		UINT nBytesRead;
		DWORD dwPosition;
		while (dwBytesRemaining) {
			dwPosition = file.GetPosition();
			nBytesRead = file.Read(pBuffer, 0x1000);
			::CharLowerBuff(pBuffer, nBytesRead);
			file.Seek((LONG)dwPosition, CFile::begin);
			file.Write(pBuffer, nBytesRead);
			dwBytesRemaining -= nBytesRead;
		}
	}
	catch (CFileException* e) {
		if (e->m_cause == CFileException::fileNotFound)
			MessageBox("File not found");
		else if (e->m_cause == CFileException::tooManyOpenFiles)
			MessageBox("File handles not enough");
		else if (e->m_cause == CFileException::hardIO)
			MessageBox("Hardware error");
		else if (e->m_cause == CFileException::diskFull)
			MessageBox("Disk full");
		else if (e->m_cause == CFileException::badPath)
			MessageBox("All or part of the path is invalid");
		else
			MessageBox("Unknown file error");
		e->Delete();
	}
	delete[] pBuffer;