關於ini文件獲取段名以及key名問題

首先看看倆個API ：

          1.GetPrivateProfileSectionNames()，顧名思義獲取段名，但很奇怪的是隻能得到第一個段名。但有木有觀察他的返回值是什麼？ OK，到這裏我們調試一下會發現第一個段名後邊有個'\0'，當然這個東西是字符串的結束標誌嘛！OK，我們再往下一個地址看看是什麼，也就是'\0'後面的東東！ NM，原來的二個段名在這裏。OK，一個結論出來了，其實他返回了所有的段名，不過每個段名之間都是用'\0'隔離開的。剩下的就是解析問題啦……

          2.GetPrivateProfileSection()，當然和前面思路一樣，他返回給我們的是所有鍵值，當然鍵值和鍵值之間也是用'\0'隔離開的！

我簡單封裝了一個類：

#include <vector>
#include <string>
using namespace std;

class CIniFile  
{
public:
	CIniFile();
    CIniFile(const char* sPath);
	virtual ~CIniFile();

	void  LoadFile(const char* sPath ); //文件路徑

	void  GetSectionNames(vector<string> &ar);/*得到所有段*/	

	void  GetKeyNames(const char* lpSection/*段名*/, vector<string> &ar);//得到某段下所有key名稱
	DWORD GetValue(const char *lpSection/*段名*/, const char *sKey/*Key值*/, string& key);//得到可以值

	void  GetKey_Value(const char* lpSection/*段名*/, vector<string> &ar );/*得到該段下的所有key-value*/


	BOOL  Write(const char* lpSection, const char* lpKey, const char* lpValue);//寫入鍵值
	BOOL  DeleteSection(const char* lpSection);//刪除段
	BOOL  DeleteKey(const char* lpSection, const char* lpKey);//刪除key

protected:
	DWORD GetSectionNames(char* lpBuffer, DWORD dwBufSize);//返回字符總數
	DWORD GetKey_Value(const char* lpSection, char* lpBuffer, DWORD dwBufSize);//返回字符總數

	BOOL  ParseString( char* buff, vector<string> &ar );//解析出段、鍵值
	
	
protected:
	string m_sPath;
};

cpp文件：

#define  DEF_PROFILE_THRESHOLD 512

CIniFile::CIniFile()
{

}

CIniFile::CIniFile( const char* sPath ):m_sPath(sPath)
{
 
}
CIniFile::~CIniFile()
{

}

void CIniFile::LoadFile(const char* sPath )
{
 m_sPath = sPath;
}

void  CIniFile::GetSectionNames( vector<string> &ar )
{
 const DWORD LEN = GetSectionNames(NULL, 0);
 if (LEN == 0)
  return;
 
 char* psz = new char[LEN + 1];

 GetSectionNames(psz, LEN);
    ParseString(psz, ar);

 delete [] psz;
}

DWORD CIniFile::GetSectionNames(char* lpBuffer, DWORD dwBufSize)
{
 if (lpBuffer == NULL)
 {
  // just calculate the required buffer size
  DWORD dwLen = DEF_PROFILE_THRESHOLD;
  char* psz = new char[dwLen + 1];
  DWORD dwCopied = ::GetPrivateProfileSectionNames(psz, dwLen, m_sPath.c_str());
  while (dwCopied + 2 >= dwLen)
  {
   dwLen += DEF_PROFILE_THRESHOLD;
   delete [] psz;
   psz = new char[dwLen + 1];
   dwCopied = ::GetPrivateProfileSectionNames(psz, dwLen, m_sPath.c_str());
  }
  
  delete [] psz;
  return dwCopied + 2;
 }
 else
 {
  return ::GetPrivateProfileSectionNames(lpBuffer, dwBufSize, m_sPath.c_str()); 
 }
}

void CIniFile::GetKey_Value(const char* lpSection/*段名*/, vector<string> &ar )
{
    DWORD Len = GetKey_Value(lpSection, NULL, 0);

 char* psz = new char[Len + 1];
 
 GetKey_Value(lpSection, psz, Len);
    ParseString(psz, ar);
 
 delete [] psz;
}

DWORD CIniFile::GetKey_Value(const char* lpSection, char* lpBuffer, DWORD dwBufSize)
{ 
 if (lpBuffer != NULL)
  *lpBuffer = _T('\0');
 
 if (lpSection == NULL)
  return 0; 
 
 if (lpBuffer == NULL)
 {
  // just calculate the required buffer size
  DWORD dwLen = DEF_PROFILE_THRESHOLD;
  char* psz = new char[dwLen + 1];
  DWORD dwCopied = ::GetPrivateProfileSection(lpSection, psz, dwLen, m_sPath.c_str());
  
  while (dwCopied + 2 >= dwLen)
  {
   dwLen += DEF_PROFILE_THRESHOLD;
   delete [] psz;
   psz = new char[dwLen + 1];
   dwCopied = ::GetPrivateProfileSection(lpSection, psz, dwLen, m_sPath.c_str());
  }
  
  delete [] psz;
  return dwCopied + 2;
 }
 else
 {
  return ::GetPrivateProfileSection(lpSection, lpBuffer, dwBufSize, m_sPath.c_str());
 }
}


BOOL CIniFile::ParseString( char* buff, vector<string> &ar )
{
 if (buff == NULL)
  return FALSE;
 
 char* p = buff;
 DWORD dwLen = _tcslen(p);
 
 while (dwLen > 0)
 {
  ar.push_back(string(p));
  p = &p[dwLen + 1];
  dwLen = _tcslen(p);
 }
 return TRUE;
}

void CIniFile::GetKeyNames(const char* lpSection/*段名*/, vector<string> &ar )
{
 vector<string> key_value;
    GetKey_Value(lpSection, key_value);//先得到所有的key_value，然後解析出來

 int num = key_value.size();

 for(int i=0; i<num; i++)
 {
  int pos = key_value[i].find('=', 0);
  if(-1 == pos)
   ar.push_back(key_value[i]);
  else
      ar.push_back(key_value[i].substr(0, pos));
 }
}

DWORD CIniFile::GetValue(const char *lpSection/*段名*/,const char *sKey/*Key值*/, string& key)
{
 if (lpSection == NULL || sKey == NULL)
  return FALSE;

 char val[512]={'\0'};
 
    DWORD ret = GetPrivateProfileString(lpSection, sKey, "", val, 512, m_sPath.c_str());
 
    key = val;
 return ret;
}

BOOL CIniFile::Write( const char* lpSection, const char* lpKey, const char* lpValue )
{
 if (lpSection == NULL || lpKey == NULL)
  return FALSE;
 
 return ::WritePrivateProfileString(lpSection, lpKey, lpValue == NULL ? _T("") : lpValue, m_sPath.c_str());
}

BOOL CIniFile::DeleteSection(const char* lpSection) 
{
 return ::WritePrivateProfileString(lpSection, NULL, _T(""), m_sPath.c_str());
}

BOOL CIniFile::DeleteKey(const char* lpSection, const char* lpKey)
{
 return ::WritePrivateProfileString(lpSection, lpKey, NULL, m_sPath.c_str());
}