堆栈损坏使用sscanf [英] Stack corruption using sscanf

问题描述

我有以下代码将2个十六进制数字转换为字节值：

  const char * data =串; 
 unsigned char temp =''; 
 sscanf（data，％2hhx，& temp）; 
  

运行时遇到运行时异常，说

堆栈变量temp已损坏

我做错了什么？ AFAIK 2hhx 应将两个字节转换为一个...

解决方案

Are你确定你的编译器和标准库支持那个特定的说明符？这是C99中的新功能。

Microsoft根本不支持它：

a href =http://msdn.microsoft.com/en-us/library/xdb9w69d.aspx> http://msdn.microsoft.com/en-us/library/xdb9w69d.aspx p>

这意味着 hh 可能被解释为单个 h ，因此需要一个指向无符号short ，而不是 unsigned char 的指针。

I have the following code to convert 2 hex digits to a byte value:

const char* data= "Some hex string";
unsigned char temp=' ';
sscanf(data, "%2hhx", &temp);

When running it I get a run time exception, saying

stack around variable temp is corrupted

What am I doing wrong? AFAIK 2hhx should convert two bytes to one...

解决方案

Are you sure your compiler and standard library support that particular specifier? It is new in C99.

Microsoft for example doesn't support it, according to this:

http://msdn.microsoft.com/en-us/library/xdb9w69d.aspx

This means that the hh is probably interpreted as a single h and it therefore expects a pointer to unsigned short, not unsigned char.

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