飞秋的不定长度字符串处理方法

飞秋XString类实现

最新推荐文章于 2022-08-27 19:40:54 发布

原创最新推荐文章于 2022-08-27 19:40:54 发布 · 2k 阅读

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#class #null

本文介绍了一种用于处理不定长字符串的XString类实现。该类通过动态内存分配来支持字符串的添加操作，并提供了获取字符串大小及内容的方法。

主要用来处理不定长度字符串，飞秋的不定长度字符串处理方法：
#define XString_LENGTH 1024 // 默认缓存区的长度

class XString
{
char *m_x;
unsigned int m_size;

public:

XString();
~XString();
unsigned int GetSize();
unsigned int GetData(char *&pData);
bool AddData(char *pData, unsigned int nLen);
};

XString::XString()
{
m_size = 0;
m_x = (char*)malloc(XString_LENGTH);
}

XString::~XString()
{
if (m_x)
{
free(m_x);
m_x = NULL;
}
}

unsigned int XString::GetSize()
{
return m_size;
}

unsigned int XString::GetData(char * &pData)
{
pData = (char*)malloc(m_size+1);

if (!pData)
return 0;

memcpy(pData, m_x, m_size);
pData[m_size] = NULL;

return m_size+1;
}

bool XString::AddData(char *pData, unsigned int nLen)
{
if (nLen <= 0)
return false;

if (! pData)
  return false;

unsigned nOldSize = m_size;
m_size += nLen;
if (m_size > XString_LENGTH)
{
  int n = m_size - XString_LENGTH;
  char *p = m_x;
  m_x = (char*)realloc(m_x, n);
  if (!m_x)
  {
   m_x = p;
   return false;
  }

memcpy(m_x+nOldSize, pData, nLen);
}
else
{
memcpy(m_x+nOldSize, pData, nLen);
}

return true;
} // 飞秋 http://bbs.freeeim.com/ 飞鸽传书

int main(int argc, char* argv[])
{
XString a;
for (int i=0; i<100; i++)
{
  if (! a.AddData("88888888", 8))
  {
   printf("add data failed.\n");
  }
}

char *p;
a.GetData(p);
printf("%s-%d", p, a.GetSize());
free(p);
getchar();
return 0;
}
// 飞秋 http://bbs.freeeim.com/ 飞鸽传书