文件读写操作

Question

比如说：

我做了一个结构体

struct Node

{

   char data;

    int   NO;

}

现在有一个 data.txt 的文本文件，里面写着：

A

12

B

45

C

67

我现在要创建一个Node[3]的数组

并且把   A和12放到Node[0]的data和NO里

    把   B和45放到Node[1]的data和NO里

    把   C和67放到Node[2]的data和NO里

这个函数要怎么写啊？？纠结！！！

Answer 1

fopen()打开文件

fgets()获取字串

获取两次写一次

用atoi将字串转成数字。

Answer 2

 FILE *fp = fopen("data.txt", "rt");
 while (!feof(fp))
 {
  Node node;
  fscanf(fp, "%c\r\n", &node.data);
  fscanf(fp, "%d\r\n", &node.NO);

  printf("Node.data = %c, node.NO = %d.\r\n", node.data, node.NO);
 }
 fclose(fp);

Answer 3

你可以在函数体中添加以下代码，实现你想要的功能。
 

          Node nodes[3];
	 FILE *fp = fopen("file.txt", "rt");
	 for(int i=0;i<3;i++)
	 {	 	
	  fscanf(fp, "%c\r\n", &nodes[i].data);
	  fscanf(fp, "%d\r\n", &nodes[i].NO);
	  if(feof(fp))
	  {break;}
	 }
	 fclose(fp);

---

Helen Zhao[MSFT]
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Answer 4

int _tmain(int argc, _TCHAR* argv[])
{
	struct Node
	{
		char data;
		int   NO;
	};
#define MAX_COUNT 3
	Node nodes[MAX_COUNT];
	try
	{
		CStdioFile file(_T("E:\\data.txt"), CFile::modeRead);
		CString strLine(_T(""));
		int nIndex = 0;
		int i = 0;
		while(file.ReadString(strLine))
		{
			if(nIndex >= MAX_COUNT)
				break;
			if(++i % 2)
			{
				nodes[nIndex].data = strLine.GetAt(0);
			}
			else
			{
				nodes[nIndex].NO = _ttoi(strLine);
				nIndex++;
			}
		}
		file.Close();
	}
	catch (CFileException* e)
	{
		e->ReportError();
		e->Delete();
	}
	return 0;
}

 

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Visual C++ enthusiast, like network programming and driver development. At present is being engaged in the WinCE/Windows Mobile platform embedded development.