关于ini文件获取段名以及key名问题

首先看看俩个API ：

1.GetPrivateProfileSectionNames()，顾名思义获取段名，但很奇怪的是只能得到第一个段名。但有木有观察他的返回值是什么？ OK，到这里我们调试一下会发现第一个段名后边有个'\0'，当然这个东西是字符串的结束标志嘛！OK，我们再往下一个地址看看是什么，也就是'\0'后面的东东！ NM，原来的二个段名在这里。OK，一个结论出来了，其实他返回了所有的段名，不过每个段名之间都是用'\0'隔离开的。剩下的就是解析问题啦……

2.GetPrivateProfileSection()，当然和前面思路一样，他返回给我们的是所有键值，当然键值和键值之间也是用'\0'隔离开的！

我简单封装了一个类：

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

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

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

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名称
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 );/*得到该段下的所有key-value*/

BOOL  Write(const char* lpSection, const char* lpKey, const char* lpValue);//写入键值
BOOL  DeleteSection(const char* lpSection);//删除段
BOOL  DeleteKey(const char* lpSection, const char* lpKey);//删除key

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

BOOL  ParseString( char* buff, vector<string> &ar );//解析出段、键值

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，然后解析出来

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());
}