fscanf_s在Winserver2008中无法正常工作VS2013 64位

Question

当我们在Visual Studio 2013（C++控制台应用程序），Os-Winsever2008（64位）中使用fscanf_s方法时，文件指针提前读取一个或两个字节的数据。 例如：在读取文本文件时，文件的第二行是“Administartor”，但fscanf_s（）将该单词作为“dministrator”返回。 请帮我解决这个问题。 代码是使用Visual Studio 2008

FILE* pFile; 
pFile = NULL; 
string strFile = "E:\\10_Products.lrf"; 
fopen_s(&pFile, strFile.c_str(), "r"); 
char szTemp[256]; 
string strTemp = ""; 
if (NULL != pFile) 
{ 
    while (!feof(pFile)) 
    { 
     nRet = fscanf_s(pFile, "%s", szTemp); 
     if (EOF == nRet) 
     { 
      cout << "EOF detected"; 
     } 
    } 
    return 0; 
} 

10_Products.lrf文件的格式如下工作正常的Windows XP 32位。

[OPERATOR_LEVEL] 
Administrator 

Answer 1

从文档上fscanf_s（），http://msdn.microsoft.com/en-us/library/6ybhk9kc.aspx：

The main difference between the secure functions (with the _s suffix) and the older functions is that the secure functions require the size of each c, C, s, S and [ type field to be passed as an argument immediately following the variable. For more information, see scanf_s, _scanf_s_l, wscanf_s, _wscanf_s_l and scanf Width Specification. 

而且http://msdn.microsoft.com/en-us/library/w40768et.aspx：

Unlike scanf and wscanf, scanf_s and wscanf_s require the buffer size to be specified for all input parameters of type c, C, s, S, or [. The buffer size is passed as an additional parameter immediately following the pointer to the buffer or variable. For example, if reading a string, the buffer size for that string is passed as follows: 

char s[10]; 

scanf("%9s", s, 10); 

所以你应该把它像这样：

fscanf_s（FP， “％80s”，cmd，sizeof（cmd））;