C++从文件读出空字符

2012-05-07 10:38:40 316 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

C++堆上指针new/delete,文件的读写----C++基础(第二期) 本文介绍了C++ 基础知识：内容关于数组与字符串，指针，模板类vector，array，字符函数库cctype，C++文件的简单读写阅读详情

使用bitmap的时候，将其写到文件中，其中含有很多空字符。现在想要从文件中读出这些内容，重建bitmap，但是总是读不出来。请教大家如何从文件中读出空字符？
尝试过以下方法，都未见效。

///*

	char *bmap = new char[HASH_SIZE];

	memset(bmap, 0, HASH_SIZE);



	int nCount = 0;

	while(infile.good())

	{

		bmap[nCount++] = infile.get();

		if(infile.fail())

		{

			PRINT("reading bmap failed!\n");

		}

		else if(infile.bad())

		{

			PRINT("reading bad!\n");

		}



		if(0 <= nCount)

		{

			infile.get();	//read a '\n'

			break;

		}

	}

	delete bmap;

	//*/

	/*

	string bloom;

	getline(infile, bloom);

	//infile.get.getline();

	if(HASH_SIZE != bloom.length())

	{

		PRINT("the memento file %d or HASH_SIZE %d has been changed!!!\n", bloom.length(), HASH_SIZE);

		exit(0);

	}

	*/

	/*

	char *bmap = new char[HASH_SIZE];

	memset(bmap, 0, HASH_SIZE);

	infile.read(bmap, HASH_SIZE);

	if(HASH_SIZE != infile.gcount())

	{

		PRINT("the memento file %d or HASH_SIZE %d has been changed!!!\n", infile.gcount(), HASH_SIZE);

		exit(0);

	}

	delete bmap;

	//*/