主要用來處理不定長度字符串，飛秋的不定長度字符串處理方法：
#define XString_LENGTH 1024 // 默認緩存區的長度

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;
} // 飛秋 http://bbs.freeeim.com/?飛鴿傳書

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;
}
// 飛秋 http://bbs.freeeim.com/?飛鴿傳書

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